Mercedes revealed today the E-Class coupe ahead of the public unveiling scheduled for the Geneva Motor Show in March. Unlike its predecessor, the CLK , which stood in-between C-Class and the larger E-Class sizes, this model leaves no question to where it fits in the family lineup.
The design of the coupe version takes many of its cues from its sedan brother , especially the rectangular headlights. One of the hallmarks that carries over from the CLK is the absence of a b-pillar, which means with all the windows down the car gets the cool open look and hardtop convertible feel. Mercedes also claims that the slick looks makes the E-Class coupe "the most aerodynamic model in the world." The coupe has drag coefficient of 0.24, which betters the super-slick Prius ’ .25.
Like the sedan, the E-Class coupe will be offered internationally with a choice of engines with four, six and eight cylinders, with output between 200 and 382 hp. The base version is the E250 CDI that develops 200 hp and a peak torque of 368 lbs-ft and has a fuel consumption of about 44 mpg. The top version should be a V8 gas engine that powers the E500/550 models and develops 383 hp and 390 lbs-ft.
Sales will begin in Europe in May, and U.S. sales should begin shortly there after. European prices will start from 44,684.50 Euro for the E 250 CDI BlueEFFICIENCY Coupe and will go up to 66,045.00 Euro for the E 500 Coupe.
Press release after the jump.
The Geneva Motor Show will see the comeback of an intriguing product idea when Mercedes-Benz presents the Coupé range in the new E‑Class. Just three months after the presentation of the Saloon, the brand is therefore launching a new highlight in the new model series while continuing a tradition that has repeatedly met with great enthusiasm throughout the history of the E-Class.
The new E-Class Coupé offers a very special combination of two attributes for which the Mercedes brand is known: fascination and efficiency. With its classic coupé side aspect – no B-pillars and fully retractable side windows – the new two-door car is a particularly sporty interpretation of the E-Class’s dynamic design. At the same time the most aerodynamic variant of the Coupés achieves a new world best in terms of drag coefficient: with a Cd-figure of just 0.24, this model is the world’s most aerodynamically efficient series-production car. The model programme includes two new 4-cylinder engines, which consume up to 17% less fuel whilst offering a significant increase in performance and torque. The new E-Class Coupé’s standard-fit AGILITY CONTROL suspension adjusts automatically to the current driving situation. It combines driving enjoyment and excellent handling with the maximum comfort. The new E-Class Coupé will be in the showrooms of the European Mercedes-Benz dealerships and company-owned sales outlets at the beginning of May 2009.
The new Coupé offers all the technical innovations of the new E-Class series, features which customers expect to find in a sports-oriented luxury coupé. These include selective damper control, drowsiness detection, preventive occupant protection and an Active Bonnet.
As a feature specific to the Coupé, the Dynamic Driving package allows different suspension setups at the touch of a button.
Adaptive Main Beam Assist, road sign recognition and an automatic emergency braking system are other features with which the new series sets standards in this vehicle category.
The E-Class also takes on a pioneering role in the drive sector.
The new diesels and direct-injection petrol engines combine efficiency with an effortless power delivery.
The engine line-up includes two new four-cylinder models which deliver significantly more power and torque while consuming up to 17 percent less fuel.
The best example is the twin-turbo diesel E 250 CDI BlueEFFICIENCY Coupé, which consumes 5.3 litres of diesel per 100 kilometres and emits 139 grams of CO2 per kilometre, making it one of the most economical vehicles in its class.
This exemplary low fuel consumption rate has been achieved not only been because of the new engines, but also due to a number of practical measures.
These include on-demand activation of the steering and fuel pumps, the use of tyres with low rolling resistance and an alternator control system which takes account of the current driving situation and the vehicle’s electrical power requirements, plus the very important contribution made by outstanding aerodynamics.
Design which expresses passion and effortless superiority
The design of the new two-door model includes traditional styling elements which give Mercedes-Benz Coupés their unmistakable identity: for example the side windows, which are not interrupted by a B-pillar and are fully retractable.
Another hallmark of Mercedes Coupé design is the sports radiator grille with the large central star. At the same time, however, the new model points the way to the future with an exciting, contemporary design idiom.
At the same time the Coupé shows its close family resemblance to the E-Class Saloon. This is shown by the ’twin-headlamp face’, with rhomboid contours but somewhat sportier, sharper treatment for a more dynamic look.
Another design feature which the Coupé shares with the Saloon is the powerful contour of the rear wing — a styling cue which also gave the S 220 "Ponton" Coupé of 1955 its athletic appearance.
Although it shares family traits with the Saloon, the Coupé has its own, distinct identity characterised by effortless superiority and a greater sense of passion. The arrow shape of the entire front section from front bumper to radiator to bonnet, the more extreme interpretation of the twin headlamp face and its more sinewy build give it a racier and more dynamic presence.
Newly developed seats with a sporty design
The seats of the E-Class Coupé are new developments whose design and techno-logy reflect the sporty nature of this two-door Mercedes.
They are electrically adjustable for seat height and backrest angle as standard. The high, sports car-like seat backrests have a practical Easy-Entry function to make access and egress easier for rear-seat passengers.
In conjunction with electric seat adjustment with memory (an optional extra), the front seats are equipped with electro-pneumatically adjustable four-way lumbar supports; these are able to provide anatomically favourable support for the lower spine, which further improves seating comfort.
Luxury seats with leather upholstery and active ventilation are available as optional extras, as are newly developed multicontour seats with inflatable air chambers in the front seat cushions as well as in the centre and side bolsters of the backrests.
Two comfortable individual seats are available for the rear passengers. These feature backrests which can be folded down individually or together to increase the capacity of the luggage compartment.
Their compelling elegance, exclusivity and charisma have made them highlights of the Mercedes-Benz model line-up for over 70 years: the coupés with the three-pointed star on the bonnet have always exerted a special fascination. They epitomise all that a refined, sporty car should be, their technology, aesthetics and appointments forming a stylish and harmonious whole. They are cars for people who believe in making their dreams come true.
Mercedes coupés have always been offered in a number of different vehicle categories - and in different forms. There have been city coupés, touring coupés, combination coupés, sports coupés … For all their differences, these two-door models had one important factor in common: the Stuttgart-based firm has always made a point of creating coupés which are much more than just saloon models with a shorter rear section. In fact, Mercedes coupés have always been clearly identifiable as distinct models in their own right - as automotive personalities with their own charisma and their own character. It is this recipe for success that has made all Mercedes coupés, past and present, automotive classics which are sought-after collector’s items.
Sporty and elegant two-door models have occupied a permanent place in the mid-range model series - today’s E-Class - since 1967. It was in that year that Mercedes-Benz launched the coupé version of the W 114 model series which meant that customers in this traditionally high-volume segment could now choose a car with a highly distinctive character. This Coupé was followed by the "C" models of the W 123 (1977) and W 124 (1987) model series and finally the CLK (1997).
Coupé version closely related to the saloon
The new Mercedes two-door model, which reaches the market in May 2009, follows in the tracks of its successful predecessors and represents a technical and stylistic high point in the history of the E-Class coupés. Although the new model continues to emphasise its own, distinct identity, the genes of the Saloon stand out more prominently than ever and establish a closer relationship between the two models. This connection is underlined by the reappearance of the "E" in the model designation.
The status and commanding, confident presence which typify the new E-Class are also obvious characteristics of the two-door model. Although the Coupé shares the Saloon’s more pronounced, masculine look as well as its design idiom which acts as a statement of power, it complements these qualities with its own attributes to create a concept with even greater emotional appeal. Both models are unrivalled for the high standard of their technology. With trend-setting safety systems such as the ATTENTION ASSIST drowsiness warning system, PRE-SAFE® anticipatory occupant protection, Adaptive Highbeam Assist, Speed Limit Assist and PRE-SAFE® automatic emergency braking, the new two-door model boasts features which put the E-Class in pole position - not just in its own segment, but among luxury-class coupés, too.
Comfort, safety and agility
The passion people feel for a Mercedes coupé is aroused above all by the design - the lines, the colours, the choice of materials and appointments. Take the fully
retractable side windows, for example: to see them slide down and provide an unobstructed view of the interior as the outside world and the inside of the vehicle merge into a harmonious whole is just one example of how the compelling Mercedes coupé experience appeals to the emotions.
The new E-Class Coupé sends the driver’s pulse even higher when it’s out on the road and its sporty, attractive looks are matched by its youthful, character - a character that is defined by sporty handling, responsive agility and impressive power delivery. These qualities are a consequence of features such as the newly developed suspension with selective damper control, the more direct steering ratio and the new, more powerful engines which are more economical than their predecessors.
Complemented by other characteristic Mercedes qualities - especially the outstandingly high E-Class standards of safety and comfort - these attributes create an ideal basis for delivering an extremely high degree of driving enjoyment.
The highest-specification standard equipment in this market segment
The successful Mercedes coupé vehicle concept is matched by the high-specification equipment line-up which Mercedes-Benz has put together for the new two-door model and which meets the same high standards of exclusivity and individuality set for all other aspects of the E-Class Coupé. No other coupé in this vehicle category offers such a comprehensive range of equipment as standard. The line-up includes:
- Adaptive driver and passenger airbags
- Adaptive flashing brake lights
- Active Bonnet with reversible actuator
- Anti-lock braking system (ABS)
- Electrically adjustable and heated exterior mirrors
- Audio 20 CD radio with twin tuner, CD player and eight loudspeakers
- Wide-base tyres 235/45 R 17 or 235/40 R 18 (front) and 255/35 R 18 (rear) for the E 500 Coupé
- Brake Assist
- ADAPTIVE BRAKE system with Hold function and Hill Start Assist
- ELEGANCE or AVANTGARDE interior concept
- Easy-Entry function for the front seats
- Electronic Stability Program (ESP®) with acceleration skid control (ASR)
- DIRECT CONTROL suspension with selective damping system
- Colour display in dashboard
- Asymmetrically split/folding rear seats
- Five-speed automatic transmission (E 250 CGIBlueEFFICIENCY Coupé)
- Automatic belt feeders for driver and front passenger
- Belt tensioners and belt-force limiters for all seats
- Air conditioned glove compartment
- Remote boot lid unlocking
- ISOFIX child seat anchorage
- THERMATIC automatic climate control with combination activated charcoal filter
- THERMOTRONIC automatic climate control (E 500 Coupé)
- Kneebag for driver
- NECK-PRO crash-responsive head restraints
- 17-inch light-alloy wheels (18-inch for E 500 Coupé)
- ATTENTION ASSIST drowsiness detection system
- Leather-trimmed multifunction steering wheel
- PRE-SAFE®anticipatory occupant protection
- Tyre pressure loss warning system
- Rear lights with LED technology
- Windscreen wipers with intermittent setting and rain sensor
- Six-speed manual transmission (E 250 CDIBlueEFFICIENCY Coupé)
- Sidebags for driver and front passenger
- 7G-TRONIC seven-speed automatic transmission (E 350 CDIBlueEFFICIENCY Coupé, E 350 CGIBlueEFFICIENCY Coupé and E 500 Coupé)
- Seats upholstered in combined fabric/ARTICO man-made leather
- Daytime driving lights
- Bluetooth hands-free system for telephone
- Cruise control
- Front seats electrically adjustable for height and backrest angle
- Green-tinted windows
- Central locking with crash sensor
- Aluminium trim
Choice of two standard-fit interior design and equipment concepts
Mercedes-Benz offers specially designed interiors in order to provide the individuality called for by today’s customers. The two standard-equipment concepts available for the new E-Class Coupé differ principally in terms of the materials and colours used for the interior of the vehicle.
ELEGANCE interior concept
- Light roof lining, pillar trim and sun visors
- Three-spoke steering wheel and shift/selector lever trimmed with nappa leather in appointments colour and chrome insert
- Aluminium trim elements, or, optionally, wood trim elements
- Interior appointments in the colour combinations black/black, reef grey/alpaca grey or mocha brown/almond beige (leather)
- Instrument cluster with black backplate
AVANTGARDE interior concept
Black roof lining, pillar trim and sun visors
Three-spoke steering wheel and shift/selector lever trimmed with nappa leather and chrome insert
- Aluminium trim elements, or, optionally, wood trim elements in black ash
- Interior appointments in the colour combinations black/black, black/alpaca grey (leather), black/almond beige (leather), black/natural beige (leather) or black/flamenco red (leather)
- Instrument cluster with silver backplate
- AMG sports package with exclusive front and rear design
The sporty aspect of the E-Class Coupé can be reinforced with the optional AMG sports package. This comprises additional high-specification appointments details as well as a special front and rear design treatment which gives the car a distinctive look:
- Wide-base tyres: 235/40 R 18 (front) and 255/35 R 18 (rear)
- Front brake callipers with Mercedes-Benz lettering
- Perforated front brake discs
- AMG three-spoke sports steering wheel
- AMG front apron
- velour floor mats with AMGlettering
- AMG rear apron with black decor panel
- 18-inch AMG light-alloy wheels in a 6 twin-spoke design
- Multicontour seats for driver and front passenger, adjustable to suit the individual occupant
- Speed-sensitive sports steering with more direct ratio
- AMG side sill panels
- Seats upholstered in ARTICO man-made leather with contrasting topstitching or, optionally, leather or leather/nappa upholstery
- Sports suspension AGILITY CONTROL
- Sports pedals in brushed stainless steel with black rubber studs
High-tech systems on the options list
The E-Class Coupé sets new standards among coupés with its advanced assistance systems which represent a distinct plus in terms of safety, comfort and driving enjoyment. The selected items listed here provide an indication of the scope of the factory-fitted optional extras which can be specified:
- DISTRONIC PLUS proximity control system with Brake Assist PLUS and PRE-SAFE® Brake
- Adaptive Highbeam Assist (in combination with Intelligent Light System)
- Automatic child seat detection
- Audio 50 APS car radio with map navigation and DVD player
- Parking aid with parking space measurement
- Dynamic handling package with Sport mode (standard for E 500 Coupé)
- Five-speed automatic transmission (standard for E 250 CGI BlueEFFICIENCY Coupé)
- Speed Limit Assist (available from autumn 2009)
- Intelligent Light System with bi-xenon headlamps and headlamp cleaning system
- THERMOTRONIC luxury automatic climate control system (standard for E 500 Coupé)
- Luxury seats, heated and ventilated (in combination with leather appointments)
- Steering wheel with shift paddles (standard for E 500 Coupé)
- Multicontour seats for driver and front passenger
- COMAND APS multimedia system with map navigation, voice control, Music Register and DVD
- Multimedia interface in glove compartment
- Panoramic sliding sunroof
- Speed-sensitive steering
- Reversing camera
- Rear sidebags
- Power seat adjustment with memory function and four-way lumbar support
- 500-watt sound system with twelve loudspeakers
- TV tuner for digital and analogue TV reception
The new E-Class Coupé from Mercedes-Benz aims straight at the senses – it takes only a moment to be captured by the charisma of this sports car. Its taut lines, powerful muscles and sharp, arrow-shaped front speak directly to the emotions and promise compelling driving enjoyment.
The proud tradition of Mercedes-Benz coupés continues with the latest two-door model from Stuttgart. The newcomer features styling elements which give Mercedes-Benz coupés their unmistakable identity: elements such as the side window treatment which has no B-pillar to interrupt it and features fully retractable windows, or the characteristic sports radiator grille with the large central star. At the same time, this model points the way to the future with an exciting, contemporary design idiom.
The Coupé makes no secret of its close relationship to the new E-Class Saloon. It is immediately obvious from the twin-headlamp face which features a similar rhomboid design for the lights but with a somewhat sportier, sharper treatment which creates a more dynamic and incisive look. Another design feature which the Coupé shares with the Saloon is the powerful contour of the rear wing - a styling cue which also gave the S 220 "Ponton" Coupé of 1955 its athletic appearance.
Despite its E-Class family traits, the new Coupé has its own, distinct identity and a personality that speaks more directly to the emotions. The arrow shape of the entire front section from front bumper to radiator to bonnet, the more extreme interpretation of the twin headlamp face and its more sinewy build give it a racier and more dynamic presence - in short, it is every inch a coupé and evokes speed even when stationary.
The powerful styling accentuates the sleek, flowing lines
Viewed from the side, the two-door model impresses with its clean proportions and its perfect coupé profile: long bonnet, wide door, high shoulderline with elongated side window treatment, lowered roof line and a short rear overhang. A powerful, muscular form which is integrated in the side wall over the rear axle and a slender, sweeping C-pillar add to the stylish appearance and embody agility and athleticism.
A special characteristic of the contemporary Mercedes design idiom is the creative interplay of edges and surfaces. Taut, sharply defined lines, which grow out of surfaces organically and disappear into them again equally gently, structure the sides of the coupé. The high shoulderline, a prominent, downward-pointing feature line (another contemporary Mercedes styling element) and a second structuring line delimit the sensitively sculpted surfaces. Alternately concave and convex, these create a sleek yet sharply defined flow of lines which creates a fascinating interplay of reflected incident light. In short: flowing surfaces and taut curves form visual energy flows and compelling forms.
The wheel arches have deliberately been given different design treatments at the front and the rear. The resulting formal tension ensures that the overall design does not look too smooth. Indeed, it is the distinct difference between the front and the powerful rear that underlines the car’s athletic character.
Arrow-shaped front and dominant radiator grille
From the front bumper to the radiator grille to the bonnet, the pronounced arrow shape of the front section emphasises the sporty character of the Coupé. A central crease in the bonnet picks up this shape and trails back towards the windscreen. A wide, upright radiator grille with two louvres, striking chrome strips, a powerful chrome surround and the central star testifies to status and self-assurance in time-honoured Mercedes style. The grille makes a dominant, expressive statement of the brand’s identity.
The traditional twin headlamp face is based on that of the new E-Class Saloon, but has its own identity. Longer, more sharply inclined and flatter, the headlamps have a more dynamic look which is unmistakable. With their elaborate, high-tech interior and quadrant-shaped indicators, they add a sparkling finishing touch to the front of the vehicle.
A distinctive front apron with large air intakes gives the vehicle a strong, powerful presence. Two vertical struts in the front apron provide visual support for the radiator grille and give it a substantial formal base. Depending on the model version, the bumper houses either the fog lamps or the daytime driving lights and fog lamps side by side. In the versions with bi-xenon headlamps, L-shaped daytime driving lights based on LED technology give the vehicle an expressive look.
Powerful rear with innovative lights
"Powerful and not afraid to show it" could be the motto for the rear section of the new E-Class Coupé: the rear wings spanning the rear axle are sculpted to create a powerful, muscular form which visually enhances the vehicle’s width. The distinctive feature line - a characteristic Mercedes styling element - is continued skilfully around the back of the vehicle and into the tail lights, thereby forming a link between front and rear.
The LED tail lights are split and extend from the boot lid far into the side wall. In so doing, they emphasise the width and dynamism of the vehicle. Their innovative lighting technology is particularly noteworthy. An LED background lighting system provides indirect illumination of the three-dimensional back cavity in both light units and in this way sets the basic background lighting tone. Twin light arrays with twin LED light guides stand out against the background lighting. These light arrays accommodate the tail lights and the brake lights while the reversing lights and an additional LED fog lamp are integrated in the boot lid light units.
The narrowness of the gap between the light unit on the boot lid and that on the side wall, as well as the extremely precise bevelling of the adjacent light lenses allows light transmission between the two sections. As a result, the night design of the new Coupé maintains the perceived width and harmonious appearance of the rear section.
The upswept rear bumper simultaneously creates a sense of lightness, underlines the sporty character of the vehicle and serves as a visual differentiator for the different engine versions. A single oval tailpipe indicates a four-cylinder model; the V6 Coupé models can be identified by two oval tailpipes while the eight-cylinder model has two diamond-shaped tailpipes.
New paint finishes with effect pigments
The range of paint finishes comprises twelve colours, five of which are new. A high aluminium content and effect pigments provide the basis for the new stannite grey. Depending on the light incidence, it acquires a green to beige tinge and brings out the forms of the new E-Class Coupé to particularly good effect.
Interior with sporty lines and high perceived value
In the interior, the designers have continued the taut, sporty design idiom of the exterior. The compelling interplay of surfaces and clearly defined lines creates an interior whose elegance and high perceived value are evocative of modern architecture. The cockpit is structured horizontally with a dark upper section in order to avoid unwanted reflections. Interior appointments in two colours - in keeping with the logic of the two-level structure - create intriguing contrasts.
With its sporty look and feel, the cockpit design is clearly in keeping with the agile character of the new Coupé. The instrument cluster with five tubes for the dials and a central display has a slender look while the dials themselves are clearly laid out and have high-quality chrome surrounds as well as a silver backing for the scales. The background colour of the dashboard is silver or black, depending on the choice of trim elements. The three-spoke steering wheel with multifunction buttons is available in a number of different versions and colours in order to match the interior appointments.
Next to the instrument cluster - and therefore in the primary field of vision of the driver and front passenger - is the display area for the control and display system for the radio, navigation system and other functions. The system is operated by means of a rotary and push-action Controller which falls conveniently to hand in front of the asymmetrically split armrest between the front seats. This armrest also serves as a handrest when operating the Controller.
The horizontally structured dashboard flows into a centre console with a dynamic, arrow-shape where the air-conditioner control unit is to be found along with other features.
The light coming through the continuous glass roof creates a special ambience
Light has an important positive effect on people’s sense of well-being. This is why the interior mirror housing contains an ambient lighting source as well as reading lights for the driver and front passenger. A particularly pleasant lighting ambience is created by the optional panoramic sliding roof featuring heat-insulating glass which forms a continuous visual element extending from the windscreen to the rear window. This feature makes the interior brighter and even more appealing but can be covered by means of an electrically operated roller blind when required.
Sporty individual seats for the rear passengers, too
The thoroughly sporty look and feel of the new E-Class Coupé is underlined by the sporty design of the seats which also take the form of individual seats for the rear passengers. Although the Coupé is deliberately designed as a four-seater, the rear backrests still offer a 1/3 to 2/3 split folding function. The front integral seats with pronounced, faceted side bolsters and transverse piping on the seat cushion have a light, contemporary look and immediately create a distinctly sporty impression while offering excellent seating comfort. Another notable characteristic of the seats is the high-quality, hand-stitched workmanship featuring discreet flat-felled seams.
The seats are upholstered in a combination of fabric, which evokes high-quality outdoor products, and ARTICO man-made leather, or, optionally, leather.
The whole interior is dominated by pleasing surface finishes. Trim elements made from valuable, authentic materials emphasise the high-quality of the new Coupé. The sporty two-door model is equipped as standard with brushed aluminium trim elements with a sporty spin finish. Customers can also choose from fine woods: burr walnut, high-gloss black ash or the graphic linearity of pine. In all cases, the trim elements have a thin chrome strip along their upper edge.
Five appointments colours are available: black, alpaca grey and almond beige (in the form of tone-in-tone combinations or sporty contrasts), as well as the special colours natural beige and flamenco red which are offered in conjunction with black as the contrasting basic colour. Fabric is available in black and alpaca grey while leather appointments can be specified in all five colours; nappa leather is offered in the three basic colours. ARTICO leather in the AMG sports package is also offered in the three basic colours.
Preventing traffic accidents is at the heart of Mercedes-Benz’s commitment to safety. This is why the engineers in Sindelfingen are dedicated to advancing the development of sophisticated assistance systems which warn and assist the driver in critical situations and can act autonomously if there is acute danger. ABS, ESP® and Brake Assist were the first technologies of this kind; their positive effect has since been confirmed by accident statistics.
The new or modified driver assistance systems in the E-Class Coupé are based
on state-of-the-art radar, camera and sensor technology. They are specially configured to help reduce the number of accidents caused by being too close to the vehicle in front, drowsiness and darkness.
ATTENTION ASSIST, invented by Mercedes, is specified as standard. With this system, Mercedes-Benz is making a further key contribution towards active safety as, according to studies, around a quarter of all serious motorway accidents are caused by drowsy drivers - making drowsiness an even bigger cause of accidents than drink-driving. The drowsiness-detection system monitors the driver’s behaviour on a permanent basis, recording a total of more than 70 parameters to gauge the driver’s level of awareness. This continuous monitoring is crucial for detecting the floating transition from awakeness to drowsiness and for giving the driver plenty of warning.
Based on this wealth of data (see figure), ATTENTION ASSIST calculates an individual driver profile during the first few minutes of every trip. This profile is then compared with the current sensor data and the prevailing driving situation by the car’s electronic control unit. In addition to the vehicle speed, lateral acceleration and longitudinal acceleration, the Mercedes system also detects use of the turn indicators and the pedals as well as certain control inputs and external influences such as side winds or road unevenness, for example.
Drowsiness detection: steering behaviour as the key indicator
Four years of development and testing work on the ATTENTION ASSIST system revealed steering behaviour to be an extremely meaningful indicator of drowsiness. In the tests involving over 670 drivers, the Mercedes scientists determined that drowsy drivers have trouble steering a precise course in their lane, making minor steering errorsthat are often corrected quickly and abruptly. This effect occurs at an early stage when drowsiness kicks in - often before the dangerous microsleep phase. ATTENTION ASSIST is active at speeds of between 80 and 180 km/h.
If the system detects drowsiness, it emits an audible warning signal and flashes up an unequivocal message on the display in the instrument cluster:
"ATTENTION ASSIST. Break!"
Highbeam Assist: optimum light distribution in every driving situation
Driving can be particularly dangerous at night. Although there is far less traffic on the road in the evening and at night, almost 40 percent of all fatal traffic accidents occur during the hours of darkness. One of the main causes of accidents is the driver’s lack of visibility. According to a study carried out by the TÜV (German technical inspection authorities), around 23,000 serious accidents involving 1200 deaths could be avoided if all cars were fitted with powerful bi-xenon headlamps.
Mercedes-Benz has used this headlamp technology since as far back as 1999. Now the Stuttgart-based brand is unveiling a further innovation in the shape of optionally available Adaptive Highbeam Assist. This innovative system adjusts the range of the headlamps automatically based on the distance to oncoming vehicles or moving vehicles in front of the car with their lights on. Consequently, the best possible headlamp range is always selected, allowing the driver to see the course of the road, pedestrians or danger spots more clearly and at an earlier stage. The low-beam range can therefore be increased from around 65 to up to 300 metres - without dazzling other motorists.
This innovative Mercedes technology is based on a camera, located on the inside of the windscreen, which monitors the traffic situation in front of the car. Thanks to a special image-processing algorithm, the camera is able to detect other vehicles and the distance to them. The range of the variable-control bi-xenon headlamps is set based on these findings and adapted continuously depending on the distance to the vehicle in front or the oncoming traffic. The system operates at lightning speed, sending new data to the headlamps every 40 milliseconds and controlling the beam of light so that it always ends in front of the other vehicles.
Adaptive Highbeam Assist additionally takes into account the steering angle in order to dim the headlamps on tight bends. If the road ahead is clear, the system performs a gradual transition to high-beam mode.
Realistic tests confirm that motorists who use Adaptive Highbeam Assist are safer on the road in the dark: dummies placed at the side of the road to simulate pedestrians were detected from a distance of around 260 metres - around 150 metres earlier than is the case when conventional low beam is used - despite the presence of oncoming traffic. The new Mercedes assistance system therefore offers more than double the safety at night. What’s more, the system helps to relieve driver stress as there is no longer any need to repeatedly flick the stalk on the steering wheel. So the driver can concentrate more on actually driving the car.
Adaptive Highbeam Assist is ready to act at speeds above 55 km/h and operates autonomously once the driver has moved the rotary light switch to the "Auto"
position and selected high beam using the multifunction stalk on the steering wheel.
Intelligent Light System: five light functions with bi-xenon headlamps
The Intelligent Light System is another innovation in lighting technology available for the new E-Class Coupé. This optional extra provides five different light functions designed specifically for typical driving situations and weather conditions:
- The familiar low-beam headlamps are replaced by country mode, which illuminates the road verge on the driver’s side more broadly and brightly than before. This enables drivers to orientate themselves even more easily in the dark, and respond more rapidly when other road users cross the road.
- Motorway mode, which comes on automatically when driving above 90 km/h, increases the driver’s range of vision by up to 60 per cent. This lighting function is activated in two stages: the Intelligent Light System first increases the output of the bi-xenon bulbs from 35 to 38 watts, thereby increasing the light intensity and providing noticeably better illumination of the road ahead and the side verges. The second stage of motorway mode is triggered at 110 km/h, when the beam of the bi-xenon module on the driver’s side is elevated slightly. Motorway mode has a range of around 120 metres, and the driver is able to see about 50 metres further at the centre of this cone of light than with conventional low-beam headlamps.
- With the enhanced fog lamps, Mercedes-Benz improves driver orientation when visibility is poor. The new lighting function is activated at speeds below 70 km/h, as soon as the rear fog lamp is switched on. The variable headlamp technology incorporated in the Intelligent Light System makes it possible to pivot the bi‑xenon headlamp on the driver’s side outwards by eight degrees, while lowering the beam of light at the same time. This adjustment illuminates the inner half of the road more brightly and reduces the degree of glare from light reflected back by the fog.
- Depending on the steering angle, yaw rate and vehicle speed, the active light function pivots the headlamps sideways by up to 15 degrees in fractions of a second to greatly improve road illumination. On a long sweeping bend with a radius of 190 metres, the driver is able to see 25 metres further than with conventional low-beam headlamps thanks to the active light function, which, incidentally, operates with both low and high beam.
- The cornering light function improves safety at crossroads, at T-junctions and on tight bends. It is activated automatically when the driver turns the steering wheel at a speed below 70 km/h. The lights then swivel to illuminate the area diagonally in front of the vehicle for a distance of around 30 metres, with an angle of coverage of up to 65 degrees.
The new E-Class Coupé is fitted with halogen headlamps as standard. For low beam, the Mercedes engineers have developed a sophisticated projection system, which is housed in the two larger lamps at the front end. The inner headlamps, based on reflection technology, provide the high beam and serve as side lights. Headlamp Assist, which switches on the headlamps automatically when it is raining, at dusk/dawn, in the dark and when entering a tunnel, is likewise specified as standard.
When it comes to road safety, being seen is as just as important as seeing - and not just at night. This is why the standard equipment package for the E-Class Coupé includes circular daytime driving lights based on halogen technology, which are located next to the likewise standard-fitted fog lamps and switch on automatically when the engine is started. They are deactivated when the driver switches on low beam. If the Intelligent Light System (optional) is specified, the daytime driving lights are formed by a total of 14 light emitting diodes (LEDs) arranged in an L-shape, which offer high light output but have a low energy consumption of just ten watts. These are dimmed when low beam is switched on. In this case, the fog lamps are integrated in the main headlamps.
Tail lights: LEDs for every function
Mercedes-Benz also specifies LEDs as standard for the indicators, tail lights, brake lights and rear fog light in the rear light clusters. One of the advantages of LEDs is their quick response, meaning that drivers behind receive an earlier warning if the Coupé’s brakes are applied in the event of danger. What’s more, this technology allows a new and unmistakable night design.
Like many of the latest Mercedes passenger cars, the new Mercedes Coupé is fitted with adaptive brake lights, which flash four times as fast as the hazard warning lights during an emergency stop and, therefore, provide an extremely effective warning for drivers behind if a head-to-tail collision is imminent.
The combination of directly and indirectly emitting LEDs used for the tail lights ensures that the red sections of the rear light clusters, which are drawn deeply into the car’s flanks, are illuminated homogeneously.
Speed Limit Assist: speed limit displayed in the instrument cluster
As well as being used by Adaptive Highbeam Assist, the electronic camera located on the inside of the windscreen provides the image information for Speed Limit Assist (optional). This newly developed system reminds drivers of the speed limit currently in force by displaying it in the instrument cluster - a further contribution towards preventing accidents.
The image recorded by the windscreen-mounted camera is scanned for round surfaces only by an electronic control unit. These surfaces are then highlighted. In the next step, an algorithm filters out all objects that are round but do not resemble traffic signs. Finally, a comparison with stored patterns eliminates all but those objects which the system is programmed to detect: round traffic signs indicating the speed limit. The symbols are sent to the cockpit display, where they remain visible until the speed restriction is lifted or changed. The driver is therefore always aware of the current speed limit and can adjust the car’s speed accordingly.
Thanks to the huge strides forward made in computer-based image-processing technology, Speed Limit Assist is able to work in real time, analysing the images within a fraction of a second so as to provide the driver with the required information practically instantaneously. Plus it makes no difference whether the speed-limit sign is at the side of the road or on a gantry above the road. The system is therefore able to react to variable speed limits (often indicated on gantries) as well as temporarily erected speed-limit signs, for example at road works.
Some of the speed-limit signs in Europe - for example those seen when entering or leaving towns in certain countries - are rectangular. In such cases, the assistance system also scans the data stored on the navigation system’s digital map to check the plausibility of the camera image. The last speed limit detected disappears from the display in the instrument cluster when the car enters a built-up area, for example.
DISTRONIC PLUS: radar systems to help prevent head-to-tail collisions
Radar - for monitoring events in front of and behind the car as well as warning the driver in critical situations - is a tried-and-trusted technology introduced at Mercedes-Benz in 1998. It plays an important part in helping to prevent accidents, as shown by an analysis based on representative accident-research data. This technology can prevent a fifth of all head-to-tail crashes in Germany alone. On motorways, the accident rate can be reduced by as much as around 36 percent. For the new E-Class Coupé, Mercedes-Benz offers a radar-based assistance system in the shape of DISTRONIC PLUS (optional), which also incorporates Brake Assist PLUS.
DISTRONIC PLUSproximity control operates at speeds of between 0 and 200 km/h: it keeps the car a set distance behind the vehicle in front, applies the brakes as required and can even bring the car to a complete halt, depending on the traffic situation. If the gap to the vehicle in front narrows too quickly, the system gives the driver an audible warning and, as soon as this first warning signal sounds, automatically calculates the brake pressure required to prevent a collision in this situation.
This technology helps the driver to gauge the level of risk and, in combination with Brake Assist PLUS, makes the calculated brake boosting force available instantly, even if the driver does not press the brake pedal forcefully enough. Brake Assist PLUS allows controlled, targeted braking and, if necessary, increases the braking force right up to the point at which an emergency stop is performed, depending on the road speed and the distance to the vehicle in front.
When a potential accident situation is recognised, two wide-angle short-range sensors with an 80-degree beam width and a range of around 30 metres, located behind the front bumper, and a long-range radar with a range of 200 metres, located in the radiator grille, are called upon to offer assistance. In addition, the sensor system now also has medium-range detection capability, allowing monitoring of the area up to around 60 metres ahead of the car with a 60-degree beam width. This new technology enables even more accurate monitoring of the traffic situation and even better detection of dynamic events such as a car in front swerving suddenly.
PRE-SAFE® Brake: autonomous braking as "electronic crumple zone"
Accident research shows that drivers do not always react as quickly as necessary at critical moments - for example because they are distracted and therefore do not recognise the immediate danger of a head-to-tail collision, or because they fail to heed the warning signals given by an assistance system. The PRE-SAFE® Brake intervenes in situations such as these by braking the car automatically. It does so in two stages: around 1.6 seconds before the calculated impact point - after three audible warning signals - the system initiates partial braking autonomously and decelerates the car with around 40 percent of the maximum braking power (approx 4 m/s²) as well as activating the reversible PRE-SAFE® occupant protection systems as a precaution.
Designed to supplement the visual and audible warnings, autonomous partial braking gives the driver a further, perceptible signal to act. If the driver then brakes immediately, the maximum braking force is made available or, if the driver swerves, the accident can be avoided at the last moment, depending on the driving situation.
If the driver fails to react, however, even after automatic partial braking, the PRE‑SAFE®Brake activates the maximum braking power around 0.6 seconds before the now unavoidable collision. This emergency braking can reduce the severity of the impact by a substantial margin.
Effect: impact speed reduced by 16 km/h on average
Realistic tests carried out by the Mercedes engineers have revealed that autonomous PRE-SAFE® braking reduces the impact speed by 16 km/h on average. The system therefore acts like an "electronic crumple zone", offering the car occupants an even higher level of protection.
The PRE-SAFE®Brake is active at speeds of between 30 and 200 km/h when moving vehicles are detected in front of the car. The system also reacts if the car approaches a stationary queue of traffic, providing the car’s speed is below 70 km/h.
Parking aid: ultrasonic measurement of parking spaces
A newly developed system that can help drivers to park safely works on the basis of ultrasonic technology: sideways inclined sensors on the front bumper record the length of a parking space as the car drives past it (at a speed of up to 35 km/h), and indicate on the cockpit display whether the space is large enough to park in. After reverse gear has been engaged, instructions for safe parking appear on the display in the instrument cluster.
The tried-and-trusted Mercedes PARKTRONIC system (optional extra), which uses LEDs and audible signals to indicate the distance between the Coupé and an obstacle or another vehicle when parking, is integrated in the Parking Guidance system.
Mercedes‑Benz offers a further parking and manoeuvring aid in the shape of a reversing camera which films the area behind the E-Class Coupé and sends the image to the display in the centre of the dashboard.
Aerodynamics: best cd figure of all series-production cars
Like its Saloon counterpart, the new E-Class Coupé is exceptionally aerodynamic – one of the main reasons behind the high level of active safety and the low fuel consumption. The drag coefficient (cd figure) is as low as 0.24, depending on model, which is around eleven percent lower than the figure for the previous model, making the new E-Class Coupé the world’s most aerodynamic series-production car.
The rear of a car affects the drag coefficient even more than the front section, since the air swirl that can occur here acts like an invisible brake and increases fuel consumption unnecessarily. One of the ways in which the Mercedes experts prevent such air swirl is by incorporating a discreet, barely visible spoiler lip in the central area of the boot lid. In addition to this, they equip the tail-light lenses with special spoiler lips, which direct the airstream flowing along the car’s flanks a long way rearwards; were these small spoiler lips not included, the air would flow inwards at the rear of the Coupé and create a vacuum, which would have a negative impact on both wind resistance and lift.
Further aerodynamically effective details displayed by the new E-Class include:
- controllable fan shutter: allows the amount of cooling air to be limited as required, depending on the driving situation. Otherwise heavy pressure losses would occur as the air made its way into the engine compartment.
- Sealed joints between the bonnet and headlamps: ensure an even better airflow around the front section.
- Wheel spoilers on the front and rear wheels: improve the airflow around the tyres and reduce lift.
- Cladding of the engine compartment and the underbody: optimises the flow of cooling air from the engine compartment and prevents flow losses caused by air blockage und swirl on the underbody.
- Aerodynamic exterior mirror housings: improve aerodynamics as well as aeroacoustics and safety.
The exterior mirrors also play a crucial role in enhancing perceptual safety as they improve the driver’s visibility in the rain. The mirror housings are designed so that any rainwater hitting them flows outwards in a narrow groove running around the outside so that it can drip off at a precisely defined point. As a consequence, the side windows remain largely clean, affording the driver an unimpeded view of the exterior mirror and the outside. The A-pillars likewise help to keep dirt away from the side windows as they feature special water guides where the rainwater hitting the windscreen is collected before being blown downwards as well as rearwards across the roof by the airflow.
In the new E-Class Coupé, occupant protection actually begins in the phase leading up to a possible accident thanks to the Mercedes PRE-SAFE® invention, which is specified as standard for the two-door model. If there is a risk of an accident, the system activates protective measures as a precaution, allowing the seat belts and airbags to deploy with maximum effect in the event of a collision. This early accident detection is possible because PRE-SAFE® is an intelligent synergy of active and passive safety. It is linked to Brake Assist and the Electronic Stability Program (ESP®), whose sensors detect critical driving situations and send the relevant information to the electronic control units within a matter of milliseconds. PRE-SAFE® also uses these sensor data.
All PRE-SAFE®protective measures are reversible: if the accident is averted, the advance tensioning of the seat belts is halted automatically, and the occupants are able to reset the positions of the seats and the sunroof. The anticipatory occupant protection system is then ready for action again straightaway.
The technology used for the PRE - SAFE ® belt tensioners enables a further protective measure to be activated as a precaution: once the driver and front passenger have put on their seat belts, the electric motors tighten the belt straps to reduce belt slack right at the start of a trip.
For the first time, PRE-SAFE® also uses the information provided by the short-range radar sensors (optional) in the front bumper to tension the front seat belts at the very last moment before an unavoidable collision, thus reducing the loads exerted on the driver and front passenger during a collision. This PRE-SAFE® function is literally the "ultima ratio" of anticipatory occupant protection, since the accident occurs around 200 milliseconds later.
Analyses performed during crash tests show just how important and effective this safety system can be. In the case of precautionary belt tensioning, for example, the measures mean that the driver and front passenger are held in their seats in the best possible position and so do not move forwards as much before the impact, thus reducing the load exerted on the head and neck area. These tests showed that the head was subjected to around 30 per cent less stress, while the Mercedes engineers recorded a reduction of around 40 per cent in the neck area.
Front-end structure: further enlarged crumple zone on four levels
Compared to the previous model series, the Mercedes engineers have enlarged the deformation zones substantially in the front and rear sections of the new E‑Class Coupé as well as improving the energy flows. The front crumple zone has four independently-acting impact levels, meaning that the forces can be distributed over a wide area while bypassing the passenger cell.
1) Sectional panels above the wheel arches form the upper side-member level. From here, the impact forces are channelled into the A-pillars and, subsequently, into the roof frame.
2) An aluminium crossmember connects the forward-extended side members and ensures that the forces are transferred to the side facing away from the impact. The crossmember and the forward-extended side members form the central impact zone.
3) The subframe to which the engine, steering and front axle are attached also serves as an impact level in the event of a frontal collision. It is made of high-strength steel and, depending on the engine variant, can be connected to the newly developed floor side members by means of special supporting tubes. As a consequence, the subframe can deform in a predetermined manner and absorb energy in the event of a crash on the one hand and channel high impact forces straight into the vehicle floor on the other.
4) The side skirts have been extended forwards to support the wheel and prevent it from entering the footwell in the event of an offset frontal collision. In order to provide specifically targeted front-wheel support and location, Mercedes-Benz has also developed special struts and additional energy-absorbing elements for the wheel arches.
The struts are arranged diagonally and prevent the passenger cell from sinking in the event of an impact.
The firewall is a four-part construction. This design enables Mercedes engineers to vary the material thickness according to the level of vulnerability in an accident. As the load acting on the firewall during a frontal crash is greatest in the lower section, the sheet steel used here is almost 50 percent thicker.
Side wall: two-shell construction with reinforcements
Like the designers, the body specialists and safety engineers at the Mercedes-Benz Technology Centre (MTC) in Sindelfingen played a major part in creating one of the new E-Class Coupé’s most attractive design features: the elegant side lines, along with the continuous strip of the side windows and the filigree roof pillars were only made possible thanks to a series of complex body manufacturing processes. All of which enables the Coupé to meet the most stringent of test requirements with respect to torsional stiffness and occupant protection, even though it has no upper B-pillars.
The single-piece sidewalls feature individually welded inner shells which provide strong, stiff cross-sections for the roof pillars, the roof frame and the side members. All of the load-bearing components feature additional panel reinforcements in the A-, B- and C-pillars, stretching across their entire length in each case. In addition to this, the A-pillars contain high-strength steel tubing which is capable of withstanding high impacts of the kind experienced in the roof-drop test.
Likewise, high-strength panelling is welded into the (non-visible) B-pillars which, together with numerous other reinforcement measures, provides effective resistance in the event of a side impact. Below the dashboard, there is also a solid square section which is bolted to both the A-pillars.
Materials: around 60 percent of all panels are made from high-strength steel
These examples show that, more so than ever before, Mercedes-Benz has given preference to ultra-high-strength steel alloys for the body construction because they offer maximum strength whilst minimising weight and, therefore, are essential for meeting the strict safety and durability requirements. Around two thirds of all the bodyshell panels for the new E-Class Coupé are made from these grades of steel. These ultra-high-strength alloys, which boast three to four times the tensile strength of conventional high-strength steel grades, account for around 20 percent of the weight (previous model: one percent). They are used in those areas where the material can be subjected to extreme stresses during an accident.
Mercedes-Benz’s intelligent material concept also involves the specifically targeted use of aluminium and plastic, both of which help to save weight above all. Hence the front end, bonnet, front wings and boot lid of the new Coupé are made from aluminium, while the front end is a hybrid constructionmade from sheet aluminium and fibreglass-reinforced plastic. The front single-section aluminium crash boxes are inserted into the side members and bolted to them at the side. The other front-end components are likewise bolted together and can therefore be replaced cost-effectively following an accident. Glass fibre matting-reinforced plastic has been used to produce the spare-wheel well.
Passenger cell: custom-designed floor panels and robust load-bearing sections
The passenger cell of the new two-door model is a robust structure which is virtually immune to deformation and keeps the passengers’ survival space intact, even at high impact speeds, regardless of whether the collision is head-on, from the rear or from the side, or whether the vehicle rolls over. The use of high-strength steel and thicker panels plays as important a role here as the installation of additional load-bearing members.
The main floor assembly consists of custom-designed steel sheets that either undergo flexible rolling or are laser-welded and subsequently shaped. Flexible in this sense means that the high-strength steel can be processed in such a way that areas with different steel thicknesses can be produced within a single component. The extremely thick middle blank forms the tunnel - the actual backbone of the passenger cell. Other new features which are equally crucial for both occupant protection and the rigidity of the bodyshell include the continuous floor side members, the insides of which are reinforced with additional sections. Their front sections connect to the side members, thereby lengthening the load-bearing paths along which forces can be distributed in the event of an impact. At the rear, the floor side members extend as far as the crossmember beneath the rear seat unit to stabilise the entire floor structure.
The Mercedes engineers have also incorporated sturdy aluminium transverse sections - known as transmission tunnel braces - into the floor assembly. One is located beneath the transmission, and is designed to direct forces to the side of the vehicle facing away from the impact in the event of a side-on collision. The second forms a connection between the two side members. It likewise braces the floor assembly and is able to channel impact forces into the floor structure at an early stage following a side-on collision.
Rear-end structure has successfully passed the toughest of crash tests
Multi-piece side members and a robust crossmember made from ultra-high-strength steel form the key components of the rear-end structure. The rear side members are continuous, closed box sections with carefully graduated material thicknesses. These are able to absorb high forces, thereby making a decisive contribution to occupant safety in the event of a rear impact. The bolt-on flexible crossmember is manufactured using a flexible rolling process which likewise allows the material thickness to be varied as required. Accordingly, the material thickness on the outside of the crossmember - where impact loads are highest - is greater than on the inside. The new Coupé therefore also meets the world’s most stringent crash regulations where rear impact protection is concerned, for example the 80-km/h test in the US.
Typically for a Mercedes-Benz car, the fuel tank is located in a protected position beneath the rear seats, in other words ahead of the rear axle and, therefore, outside of the impact zone.
Body torsional stiffness increased by around 24 percent
As well as being a major reason behind the high level of impact resistance, this intelligently designed bodyshell enhances ride comfort or, to be more precise,
reduces noise and vibration. The Sindelfingen engineers paid particular attention to the connecting points between the chassis and the bodyshell, which are required to withstand very high forces. These were specifically reinforced to ensure that road-induced vibrations are not transferred to the body at the expense of driving enjoyment.
A reliable indicator of the excellent cumulative effect of these measures is the body’s static torsional stiffness, which has been increased by around 24 percent compared to the outgoing model.
Restraint systems: seven airbags as standard
With seven airbags fitted as standard, not to mention four seat-belt tensioners and belt-force limiters as well as NECK-PRO crash-responsive head restraints for the driver and front passenger, the new E-Class Coupé offers an even more extensive package of safety equipment than its predecessor.
The airbags, which can deploy in a matter of milliseconds in the event of an accident, include two adaptive airbags (for the driver and front passenger), a kneebag for the driver, two sidebags in the front-seat backrests and two large windowbags which extend from the A-pillar to the C‑pillar during a side impact. Plus the E-Class Coupé is the only coupé in this vehicle category to also offer the option of sidebags for the rear passengers.
Three-point inertia-reel seat belts with belt tensioners and belt-force limiters are fitted as standard for all the occupants. The Mercedes engineers have developed practical technology in the form of automatic belt feeders in order to make it even easier for the driver and front passenger to put on these seat belts. As soon as the occupants are seated, an electric motor extends plastic sections from the side panels on both sides, bringing the seat belt to within easy reach.
The belt feeders retract again once the seat belts have been put on; the belt feeder on the front-passenger side retracts automatically after around five seconds if the seat is unoccupied. A push of a button on the dashboard is all it takes to re-activate the belt feeders.
Crash-responsive head restraints for driver and front passenger
NECK-PROis the name Mercedes-Benz has given to a crash-responsive head restraint whose development, like that of PRE-SAFE® and other Mercedes innovations, is based on analyses of real accidents. NECK-PRO is an effective means of reducing the risk of whiplash injuries during a rear-end collision. If the sensor system detects a rear-end collision with a defined impact severity, it releases pre-tensioned springs inside the head restraints, causing the head restraints to move forward by about 40 millimetres and upwards by 30 millimetres within a matter of milliseconds.
Pedestrian protection: extensive raft of measures including Active Bonnet
The protection of those road users who are most at risk has always been a top priority during the development of Mercedes passenger cars. Smooth-surfaced bodies, energy-absorbing bumpers, flush-mounted door handles, laminated-glass windscreens, folding exterior mirrors and recessed windscreen wipers are pedestrian-protection measures that have been features of Mercedes models for many years. But, as ever, another top priority for the safety engineers is accident prevention. So systems such as Brake Assist and the cornering light function play crucial roles. Fitting Brake Assist as standard alone has reduced the rate of serious accidents involving collisions between pedestrians and Mercedes passenger cars by 13 percent.
The additional protective measures Mercedes-Benz has introduced for the E‑Class, including the new Coupé model, are based on these high standards. Top of the bill is an Active Bonnet, which enlarges the deformation area, reducing the risk of injury to pedestrians. This system, fitted as standard, includes three impact sensors in the front section as well as special bonnet hinges pretensioned and arrested by powerful springs. Upon impact with a pedestrian, the sensors send information to the electronic control unit which, in turn, activates two solenoids in the hinges instantaneously. These solenoids release the arresters so that the rear section of the bonnet is pushed upwards by 50 millimetres by means of spring force. It all takes just a fraction of a second.
As well as being extremely fast, the newly developed technology has a further crucial benefit: the Active Bonnet is reversible. If the bonnet is released in another type of collision, for example, Mercedes customers can reset it to its original position and, therefore, reactivate the system themselves, allowing them to continue driving.
In addition to this, the Mercedes engineers have increased the deformation space between the bonnet and the assemblies beneath it by raising the Coupé’s exterior contours and lowering the engine, shock absorber towers, reservoirs and control units. As on all the latest Mercedes models, the front bumper incorporates a flush spoiler lip with a bracing function, which provides a pedestrian with uniform cushioning at an early stage in a collision.
Aesthetics and ergonomic design - two of the main aims when Mercedes-Benz designs and develops car interiors. And the new E-Class Coupé is proof that the Sindelfingen designers and engineers are also masters of these disciplines. The team of designers has created an attractive, appealing interior by using sophisticated styling, fine materials and pleasant colours, while the engineers implemented new comfort- and enjoyment-enhancing ideas and concepts to perfect this "atmosphere of wellbeing". The end result is a unique symbiosis of aesthetics and technology.
Key factors that enable man and machine to exist in perfect harmony include the dimensions which determine spaciousness for the occupants: seat spacing, headroom, kneeroom, elbow width and shoulder width. In all of these areas, the new Mercedes Coupé is substantially larger than the preceding model: the body is 46 millimetres longer and 46 millimetres wider than previously, while the wheelbase has been increased by 45 millimetres to 2760 millimetres.
These basic dimensions are a major factor behind the enhanced ride comfort and interior spaciousness. This is highlighted, for example, by the seat reference point - effectively the distance between the front and rear seats, which is crucial in determining the space in which the occupants are able to move and now stands at 789 millimetres (outgoing model: 779 millimetres) - as well as the new dimensions for shoulder room and elbow width. Here the new Coupé impresses by offering up to 49 millimetres more (front elbow width) than its predecessor, largely down to the wider body and the wider track (up to 33 millimetres wider at the front and up to 70 millimetres wider at the rear).
When it came to planning the boot, the Mercedes experts focussed on drivers’ everyday needs. Hence the key criteria for the boot design were sufficient space for safely stowing four sets of luggage, practical variability when using the luggage compartment and excellent functionality for stowing large and small items. Compared to the predecessor model, the width of the luggage compartment between the wheel arches has been increased by 94 millimetres to 960 millimetres, while the height has risen by six millimetres to 461 millimetres.
The overall boot capacity of 450 litres (as per the VDA measuring method) has been increased by 15 litres despite the far more extensive basic equipment package for the new E-Class Coupé. There are 25 litres of stowage space available in the compartment beneath the luggage-compartment floor. And the folding rear-seat backrests allow Mercedes customers to increase the load-carrying capacity depending on the transport task in hand as well as producing a practically flat load bay. Standard-fit load-securing rings enable items of luggage to be secured in place.
Seats: sporty design and maximum comfort
Newly developed seats, which reflect the sporty character of the Coupé in terms of both design and technology, offer the driver and front passenger hallmark Mercedes comfort. The standard-fit NECK PRO head restraints are integrated in the raised backrests.
A host of individualisation options allows both very tall and very short drivers to adjust the seats so that the Coupé’s functions are within easy reach. The seat cushion height and backrest inclination are electrically adjustable, while the seat cushion fore/aft position and inclination can be adjusted manually.
The seats in the new E-Class Coupé have the largest fore/aft adjustment range in this market segment: 273 millimetres. The individual seat position can be adjusted in very small 4.5-millimetre stages and, therefore, is almost continuously variable, whereas the backrest inclination is fully continuously variable.
Adjustment ranges of the standard-specification front seats:
- Fore-and-aft adjustment 273 millimetres
- Seat height 54 millimetres
- Seat cushion angle 8 degrees
- Head restraint height 80 millimetres
Standard equipment for the new Coupé includes a mechanical entry and exit aid for the rear passengers, called the Easy-Entry system. It is operated using a lever next to the head restraint, which initially tilts the seat backrest forwards. The seat can then be pushed forwards.
Memory function: comfort-enhancing four-way lumbar support
The fully electrically adjustable seats for the driver and front passenger, which Mercedes-Benz supplies as optional extras, are even easier to use. In this case, the fore/aft position, seat cushion angle, head restraint, steering column and exterior mirrors can be adjusted by electric motors in addition to the seat height and backrest angle. In addition to this, the Easy-Entry system is operated with the assistance of the electric motors.
If the Memory package (optional) is specified, three individual positions can be stored for the fully electrically adjustable front seats as well as for the steering wheel and the exterior mirrors. In this case, a touch of a button on the inner door lining is all it takes to move the seats, steering wheel and exterior mirrors to their programmed positions automatically. When the driver removes the electronic ignition key, the steering wheel can be moved upwards to make it even easier to get out of the car. The steering wheel then remains in this position until the ignition key is re-inserted, providing the driver with more legroom when getting back into the car as well.
If the Memory package is specified, the two front seats are also equipped with electropneumatically adjustable four-way lumbar supports, including side-to-side adjustment as well as height and shape adjustment so as to provide ergonomic support for the spinal column.
The foam padding used for the front seat cushions is housed in seat squabs with integral springs. Here a frame made partly of high-strength steel provides a firm base. Special tubular sections and impact-absorbing elements in the seat lining ensure that the seats are able to absorb high impact forces in a side-on collision and transfer them to the other side of the vehicle. The front-seat backrests consist of steel frames with springing and foam pads whose contours, like those of the cushions, have also been designed to provide better lateral support.
Seat climate: four ventilators for active ventilation
When developing seats, the Mercedes specialists look not only at the classic comfort features like springing and damping but also at occupant wellbeing as a whole, including what is referred to as seat climate. The materials used in a Mercedes seat, and its internal structure, must be designed to ensure comfort under all weather and temperature conditions. In the case of the new Coupé seats, this is achieved by using breathable composite seat materials and high-quality fabric or leather surface upholstery.
Climate comfort is likewise enhanced by the optionally available climatised seats with leather upholstery and active ventilation: four ventilators in the seat cushion and in the backrest extract cool air from the floor area of the interior and distribute it evenly through a ventilation tissue beneath the seat surface. The mild airflow can prevent the car’s occupants from sweating, even when it is extremely hot outside.
Multicontour seats: air chambers in the backrests and seat cushions
The newly developed multicontour seats allow the driver and front passenger to adapt the contours of the seat to suit their anatomy or personal preferences thanks to inflatable air chambers in the side bolsters of the backrest, in the lumbar region and at the front edge of the seat cushion. One special attribute of the new multicontour seat is the function for pneumatically adjusting the seat cushion length. The front air cushion increases the seat cushion length at the push of a button, allowing occupants to relax their legs and ensuring good blood circulation.
Rear: comfortable individual seats with folding backrests
For the rear passengers, there are two comfortable individual seats with integral head restraints whose distinctively contoured foam upholstery ensures a high level of comfort and excellent lateral support. The asymmetrically divided rear-seat backrests can be folded forwards individually or together to increase the boot capacity. Between the individual rear seats is a spacious stowage compartment incorporating two cup holders under a retractable cover – suitable for various cup, can and bottle formats.
Climate control: THERMOTRONIC with three individual climate modes
Comfort is all about highly individual preferences. Which is why it is important for cars to offer their occupants a wide range of personalisation options. The new Coupé meets this requirement, not only in terms of suspension tuning and seat adjustability, but also when it comes to climate comfort.
Like its Saloon counterpart, the new E-Class Coupé can be ordered with a newly developed automatic climate control system which, as well as being able to set individual temperatures in three zones (for the driver, the front passenger and the rear passengers), additionally offers special climate modes. This means that, if the optionally available THERMOTRONIC system is fitted, the car occupants can choose from "Diffuse", "Medium" and "Focus" at the push of a button and thus adjust the air quantity and air distribution to their liking without having to leave the convenient automatic mode.
In "Diffuse"mode, for example, the THERMOTRONIC system operates with a low air speed and distributes the air over a wide area so that there are fewer draughts. This is the purpose of the automatically controlled, upwards inclined diffuse nozzle in the centre of the dashboard. In "Focus" mode, meanwhile, the air outlets in the centre area of the dashboard are used for the most part, meeting the need for a direct flow of a larger quantity of air.
Sophisticated sensors also help the three-zone luxury automatic climate control system do full justice to its name. These ensure that the desired temperatures set by the occupants remain constant: even the standard-fit THERMATIC system
features two sensors for the interior temperature, four sensors for measuring the temperature of the air flowing out of the air outlets and one sensor for recording the intensity and direction of the sun’s rays, while the THERMOTRONIC system additionally includes a dewpoint/moisture sensor and a pollutant sensor.
Thanks to the dewpoint sensor, the inflowing air can be cooled and warmed up again if required, depending on its moisture content. This makes the air conditioning system all the more economical. The pollutant sensor detects excessively high levels of carbon monoxide and nitrogen oxides in the outside air, automatically switching to air recirculation mode if concentrations of these pollutants suddenly increase.
Finally, the THERMOTRONIC system is equipped with a separate control panel at the rear of the tunnel console, allowing the rear passengers to select their ideal temperature. Another highlight of the THERMOTRONIC system is the residual heat function: pressing the "Rest" button heats or ventilates the interior for around 30 minutes when the engine is switched off.
The standard equipment package for the new E-Class Coupé includes THERMATIC two-zone automatic climate control. With this system on board, the driver and front passenger can set the desired temperature using the rocker switches on the elegant control panel in the lower section of the centre console. The OLED (organic light emitting diode) display indicates the programmed levels. If automatic mode is deactivated, the blower speed and air distribution can also be adjusted by rocker switch. The "ZONE" function is new: at the push of a button, the temperature settings are synchronised, and the level selected by the driver is transferred to the front-passenger side. Two separately controllable air outlets are provided for climate control in the rear.
Heating and cooling output increased by five percent
The THERMATIC and THERMOTRONIC systems have received a boost in both heating and cooling output. The heating output has been increased by around five percent to eleven kilowatts, equivalent to the capacity of the central heating system in a modern family home. In the diesel models, a heat exchanger with six integral PTC heating elements (PTC = Positive Temperature Coefficient) is also activated when the outside temperature falls below a certain level in order to boost the effect of the main heat exchanger with an electrical output of around 1200 watts. The assistance from the PTC heater is necessary due to the high thermal efficiency of today’s CDI engines, which is precisely what makes them so economical and means that they release considerably less heat to the coolant under partial load conditions than conventional engines.
The interior is cooled rapidly by an air-conditioning unit with an output of around 8.4 kilowatts - some five percent more than the unit used in the predecessor model. Its compressor is variable in operation, allowing on-demand, i.e. economical, operation of the air conditioning. The compressor is controlled by a solenoid valve which varies the swept volume.
The climate control systems are not only more efficient, but also operate more quietly than before. Revised flow areas for the air intake, air ducts and air conditioning unit have enabled the noise level at maximum cooling output to be reduced by around three decibels (dB (A)), for example. In addition, the air ducting has been lined with acoustic absorption elements and/or sound-insulating foam.
Air cleaning: fine-dust particulate filter fitted as standard
A large, hermetically sealed fine-dust combination filter, fitted as standard, ensures that the air entering the interior is clean. It is 96 to 98 percent efficient at filtering out particles between five and ten micrometres in size and 100-percent efficient when it comes to removing ten-micrometre particles. Thanks to the activated-charcoal lining, gaseous substances, which are the cause of unpleasant odours, can also be filtered out. This filter is active on a permanent basis - even in air recirculation mode.
Dashboard: form and function in perfect harmony
As an option, the horizontally divided dashboard specially designed for the E‑Class Coupé can be ordered with a two-tone design: while the upper section and the centre console are finished in a darker shade, the lighter contrasting colour used for the knee bolster, glove compartment lid and tunnel console makes these areas really stand out. The surface of the dashboard is made from a polyurethane skin with additional padding. This sophisticated production process allows both small radii and precise edges, plus it ensures a pleasant feel.
The dashboard incorporates an illuminated glove compartment which can be cooled by the automatic climate control system. A twelve-volt outlet and a socket for connecting an external audio device are also integrated. This is likewise the location of the optional AUX-IN socket for connecting an external audio device. In addition to this, Mercedes customers can specify a Media Interface, allowing an external MP3 player to be connected.
The interior door linings also reflect the aim of the Mercedes engineers to combine elegant design with pleasing tactile qualities. This is achieved by a combination of high-quality materials such as leather, wood or aluminium with scratch-resistant plastic boasting a new grain-effect finish. The wide armrests on the interior door linings are pleasingly soft to the touch and, therefore, exceptionally comfortable. This is where the designers have elegantly and conveniently integrated the control panel for the power windows and the exterior mirrors.
Centre console: command centre for the infotainment and automatic climate control systems
The centre console blends in harmoniously with the dashboard form and colour concept. This is where the controls for the infotainment system and the optionally available car phone are located, just below the air outlets. Beneath these, the buttons for the seat heating, seat ventilation, rear window blind and other optional extras are demarcated by a discreet chrome strip. The lower section of the centre console houses the controls for the standard-fit automatic climate control system.
The visible surfaces of the switches and controls have been coated with a special lacquer which provides a silky sheen and a surface which is soft to the touch. In conjunction with the sophisticated push-push buttons, which are easy to press and have very little travel, the lacquer finish makes the selection of vehicle functions both precise and pleasant to the touch. Pressing once is enough to activate or deactivate the function concerned. The buttons always engage with a soft "click", also providing the car occupants with audible confirmation that the desired function has been activated.
Controls: proven concept from the S-Class
Fewer switches but more functions. A simple way of expressing the credo of sophisticated automotive controls at Mercedes-Benz, which are based on four basic principles:
1. Easy identification of the most important control functions
2. Rapid access to the most important spontaneous functions
3. Easy, intuitive operation of the most important functions
4. All controls located in the right place
Key features of the control concept include special hotkey-type buttons which provide fast access to frequently used functions. This is why all the control and display elements that are necessary or important during a journey are located in the cockpit, i.e. in immediate proximity to the driver. These include the switches and stalks for the lights, windscreen wipers, indicators and cruise control. Furthermore, in keeping with the "everything in the right place" logic, the switches and buttons for the power windows, central locking and exterior mirrors are where one would intuitively look for them: on the inside of the doors.
In other words, the driver does not need to learn anything new and, when it comes to the controls too, feels at home immediately in the new E-Class Coupé.
Multifunction steering wheel: twelve buttons for key functions
The buttons on the multicontour steering wheel are linked to the central display in the instrument cluster and merely need to be tapped with the thumbs to gain fast access to a wide range of information displayed right in front of the driver’s eyes. The driver uses the buttons on the left-hand side to mark one of the main menus on the central display (in horizontal direction) and to activate the desired submenu (in vertical direction). Each selection or setting is accepted by pressing the "OK" button, while the "Return" button is used to return quickly to the next-highest menu level.
The buttons on the right-hand side of the multifunction steering wheel are used to adjust the volume setting (vertical), switch to mute (centre) and operate the car phone (horizontal). Below this there is an additional button for activating the LINGUATRONIC voice-operated control system.
Cockpit: circular instruments based on a high-quality chronometer-style design
The cockpit’s round dials - including chrome bezels, white backlighting, a black or silver background and deep, slanting cylinders - emphasise the sporty, elegant character of the new Mercedes Coupé. There are five instruments in the cockpit, which provide drivers with all the information they need: speedometer (centre), rev counter (right), clock (left), coolant temperature gauge (far right) and fuel gauge (far left). The use of black-panel technology means that the indicator and warning lamps assigned to the various round dials are not visible during normal driving - they can only ever be seen when the ignition is switched on or in the event of a fault.
In the centre of the speedometer, there is a two-section central display (4.5-inch) with white backlighting, whose upper section can be used to show a variety of information such as mileage, range, oil level, route distance, driving time, current fuel consumption, average fuel consumption and average car speed. If a navigation system is installed (optional), this area of the display also provides information about the current route. This display can also be used in conjunction with the buttons on the multifunction steering wheel to select radio stations, phone numbers and around 50 individual settings.
The lower section of the central display is used for displaying icons that provide information about the status of the driver assistance systems as well as digital readouts of the outside temperature, transmission gear and transmission mode (if an automatic transmission is fitted).
Other new features include the fuel consumption and gearshift indicators, which inform the driver of the current fuel consumption and at what point the next-highest gear should be selected in order to save fuel and reduce CO2 emissions.
Colour display: view of all the infotainment functions
In the centre of the dashboard - where it can be easily seen by the driver and the front passenger - a large colour display in 16:9 format provides information about all the infotainment system functions. There are two versions of this sophisticated AM-TFT(Active Matrix Thin Film Transistor) display available, depending on the equipment specified: a 5.8-inch version for the Audio 20 and Audio 50 APS devices or a high-resolution 7.0-inch version for COMAND APS.
The Controlleron the tunnel console incorporates the main controls for the infotainment systems and allows fast and easy access to the devices’ clearly structured menus. This turn/push control can be moved in eight directions: turning the controller selects the main menu and submenus on the display, while pushing it activates or accepts the displayed function or setting. The buttons marked with symbols in front of the controller are used to quit submenus quickly or delete entries.
As the infotainment control system has a duplicate design, the radio, CD/DVDchanger, telephone and navigation system can be operated either using the Controller or by pressing control buttons. This is the purpose of the function buttons on the centre console, whose ideal ergonomic positioning allows drivers to operate them easily without diverting their eyes from the road.
Car radio: CD player and Bluetooth interface as standard Mercedes-Benz equips the E-Class Coupé with sophisticated infotainment devices that deliver outstanding performance and, above all, are easy to use. These are called Audio 20 CD (standard equipment), Audio 50 APS and COMAND APS (optional extras). All of the devices include speed-sensitive volume control, a keypad for entering telephone numbers and radio frequencies, a colour display in the centre of the dashboard and a Bluetooth interface to connect a mobile phone to the hands-free system wirelessly. Eight loudspeakers fitted as standard in the doors provide superlative sound.
Features of the Audio 20 CDsystem, fitted as standard, include a CD player (with MP3 capability), a dual tuner for FM/MW/LW/SW, automatic station search, RDS function (FM reception) and a 4 x 20-watt amplifier.
The AUDIO 50 APS infotainment system, available as an option, is an all-in-one device featuring a combination of car radio, DVD player and Europe-wide navigation system. The radio functions and the options for linking with other systems are the same as for the Audio 20 system. Mercedes customers who opt for the version with integral six-disc DVDchanger also receive the LINGUATRONIC voice-operated control system.
COMAND APS: multimedia system with even more functions
The COMAND APS multimedia system includes a DVDplayer for audio and video as well as a Europe-wide navigation system whose data are stored on a 40‑gigabyte hard drive, allowing extremely fast access to the navigation data and, compared to DVD-based navigation, even faster route calculations. The high-resolution map appears on the 7.0-inch colour display in the centre of the dashboard and provides useful additional information. By way of example, the map shows the outlines of prominent buildings along the route to aid orientation.
In addition, COMAND APS includes a Music Register for around 1000 compressed music tracks in MP3, WMA or AAC format, which can be downloaded from PC memory cards. The system has a saved database, enabling it to recognise music tracks played from a CD, DVD or the Music Register and then display the title of the track and the artist on the display. Mercedes-Benz combines COMAND APS with LINGUATRONIC voice-operated control and a text-to-speech function as standard, allowing the driver to listen to route-specific traffic reports, SMS messages, address book entries or station names. New traffic reports relevant to the current route are read out automatically by the system.
Voice-operated control: whole-word voice input for navigation, telephone and radio
Mercedes-Benz is acknowledged as one of the inventors of modern voice-operated control systems. And the LINGUATRONIC voice-operated control system has benefitted from continuous further development in recent years. The navigation system in the E-Class Coupé can be operated by entering whole words, for example: the driver no longer needs to spell out the names of countries, towns or roads, but is able to speak them as whole words. The voice control system is just as convenient when selecting radio stations or entries in the telephone directory: all the stored names can be called up without any prior voice input training.
Additional systems: technology for the ultimate in listening pleasure and entertainment
As an option, Mercedes customers can combine the infotainment devices that feature in the E-Class with further systems offering even more information and entertainment:
- The "Logic7" surround sound system, developed by Mercedes-Benz together with the audio specialists harman/kardon®, delivers three-dimensional sound as a natural 360-degree musical experience for all passengers, from both DVD and CD and regardless of whether the source was recorded in 5.1 surround or normal stereo. The audio signals are distributed via a 500-watt amplifier connected to twelve high-performance loudspeakers.
- A media interface in the glove compartment can be used to connect an iPod, USBstick or other external audio devices to the infotainment system. All that is required for this is a suitable cable from the Mercedes accessories range. The interface includes a control unit that links the external music memory to the E-Class Coupé’s on-board electronic and control systems. The advantage of this is that the titles of the tracks stored on the iPod can be shown on the colour display in the dashboard and in the instrument cluster, allowing them to be selected almost effortlessly using the buttons on the multifunction steering wheel. The battery in the audio device is charged for as long as the portable music memory is connected to the car via the media interface.
- A separate DAB tuner (DAB= Digital Audio Broadcasting) and additional aerials (optional) allow passengers on board the new E-Class Coupé to receive digital radio stations in CD quality. The system switches to analogue reception automatically when the DAB signal is too weak.
With its newly developed direct-injection diesel and petrol engines, Mercedes-Benz has taken further major strides forward in its quest to reduce both fuel consumption and exhaust emissions - without compromising on agility and driving enjoyment.
The new four-cylinder diesel engine in the E 250 CDI BlueEFFICIENCY Coupé, for example, shows just how much progress has been made: with an output of 150 kW/204 hp, a peak torque of 500 Nm and a displacement of 2.2 litres, it develops around 36 percent more power and delivers 47 percent more torque than the previous four-cylinder diesel engine yet consumes around 17 percent less fuel: 5.1 litres per 100 kilometres (provisional NEDC combined figure). What’s more, CO2 emissions are just 135 grams per kilometre. All of which means that the new CDI Coupé is more fuel-efficient than comparable models in this output category.
In the case of the petrol models too, "more power and more driving pleasure with even lower fuel consumption" proves to be the perfect formula: the likewise new E 250 CGI BlueEFFICIENCY Coupé model with direct petrol injection has a displacement of 1.8 litres and an output of 150 kW/204 hp yet consumes a mere 7.2 litres of premium unleaded petrol per 100 kilometres (provisional NEDC combined figure) - around one litre per 100 kilometres (12 percent) less than the previous four-cylinder engine (135 kW/184 hp) with conventional fuel injection and a supercharger. The CO2 emissions of the direct-injection model have been cut to 167 grams per kilometre.
As with carbon dioxide emissions, the engines for the new E-Class have also taken a further major step towards the future when it comes to exhaust gas emissions: all of the powerplants meet the requirements of the EU 5 standard, whose limits are up to 80 percent more stringent than those specified by previous standards.
Diesel engines: new four-cylinder unit featuring state-of-the-art common-rail technology
As well as being economical and ecofriendly, the four-cylinder CDI engine impresses with its exceptional agility, effortlessly superior power delivery and exemplary refinement. The former is reflected in the performance figures: the new E 250 CDI BlueEFFICIENCY Coupé needs 7.4 seconds to accelerate from 0 to 100 km/h.
The engine is part of a new series of four-cylinder powerplants, which sees Mercedes-Benz introducing the fourth generation of its tried-and-trusted common-rail direct-injection units into series production. One of its hallmarks is a 400-bar increase in the maximum rail pressure, which now stands at 2000 bar. This increased pressure potential was a key factor in raising the engine output to up to 150 kW/204 hp and the peak torque to 500 Nm whilst also achieving a significant reduction in untreated emissions.
Newly developed piezo injectors are key components in the latest CDI engine generation. They use their piezoceramic properties to change their crystal structure - and therefore their thickness - in a matter of nanoseconds when electrical voltage is applied. The new injectors are equipped with a stack of thin piezo-ceramic layers (called the "piezo stack") to enable them to achieve a sufficient overall lift from the very small lift per layer.
In contrast to the systems commonly used to date, this lift activates the nozzle needle directly, so that the fuel injection can be adjusted even more precisely in line with the current load and engine-speed situation - for example by means of precise multiple injections, which have a favourable effect on emissions, fuel consumption and combustion noise. What’s more, the engine is far quieter when idling than its predecessor.
Another key factor behind the impressive output and fuel consumption at full load with respect to emissions is the maximum ignition pressure. And, with 200 bar, the new four-cylinder diesel unit from Mercedes-Benz is among the leading contenders in the field of passenger-car diesel engines.
Torque: two-stage turbocharging for exceptional pulling power
The new diesel engine in the E 250 CDIBlueEFFICIENCY Coupé model marks the debut of two-stage turbocharging in a series-production diesel engine for Mercedes-Benz passenger cars. The aim is to achieve further advantages compared to a single-stage turbocharger, for example a further improvement in start-up performance and peak output.
The compact module for the new two-stage turbocharger consists of a small high-pressure (HP) turbocharger and a large low-pressure (LP) turbocharger. These are connected in series, and each has a turbine and a compressor driven by this turbine. The HP turbine is located directly at the exhaust manifold and initially allows exhaust gas to flow through it; it then rotates at up to 215,000 revolutions per minute. The HP turbine housing features an integral bypass duct, which can be opened or closed by means of a charge-pressure control flap triggered by a vacuum cell. If the flap is closed, the whole exhaust stream flows through the HP turbine, meaning that the exhaust-gas energy is available solely for the HP turbine drive. This means that the optimum charge pressure can be built up at low engine revs.
As the engine speed increases, the charge-pressure control flap opens. Any remaining exhaust gas energy drives the HP turbine at a maximum speed of up to 185,000 revolutions per minute. To protect against overloading, the LP turbine is also equipped with a bypass, which is opened or closed by means of a wastegate. Once the engine reaches medium revs, the HP turbine’s charge-pressure control flap is opened so wide that the HP turbine ceases to perform any appreciable work. This allows the full exhaust gas energy to be directed with low losses into the LP turbine, which then does all of the turbine work.
The two compressors are likewise connected in series and are in addition connected to a bypass duct. The combustion air from the air cleaner first flows through the low-pressure compressor, where it is compressed as a function of the LP turbine’s operating energy input. This pre-compressed air then passes into the high-pressure compressor, which is coupled to the HP turbine, where it undergoes further compression. The result is a genuine two-stage turbocharging process.
The key benefit of this sophisticated, on-demand control of the combustion air supply by means of two turbochargers is the improved cylinder charging and, consequently, a high torque even at low revs. What’s more, fuel consumption is reduced. During normal operation, the advantages of this concept can be seen in the harmonious driving characteristics without turbo lag, a good torque curve across the entire engine speed range, spontaneous throttle response and notice-ably improved performance.
As a logical addition to the turbocharger system, Mercedes-Benz installs a larger intercooler than the one seen in the previous models, which reduces the temperature of the compressed and heated air by up to 140 degrees Kelvin so that a larger volume of air can enter the combustion chambers.
Cooled exhaust gas recirculation to reduce NOx emissions
The newly developed EGRvalve works like a rotary disc valve and ensures precise control of the fresh air and recirculated exhaust gas. So as to optimise the quantity of exhaust gas recirculated and thereby achieve high recirculation rates, the exhaust gases are cooled down as required in a highly efficient heat exchanger with a large cross-sectional area. Together with the HFM (hot-film air-mass sensor) module integrated in the fresh-air ducting, which provides the engine control unit with precise information about the current fresh-air mass, this setup brings about a significant reduction in nitrogen oxide emissions.
The combustion air subsequently flows into the charge-air distributor module, which supplies air to each cylinder in a uniform manner. Built into the distributor module is an electrically controlled intake port shutoff, which allows the cross-sectional area of each cylinder’s intake port to be smoothly reduced in size. This alters the swirl of the combustion air in such a way as to ensure that the charge movement in the cylinders is set for optimum combustion and exhaust emissions over the full spectrum of engine loads and speeds.
Pedestrian protection: the advantages of a rear-mounted camshaft drive
Another of the highlights of the new four-cylinder diesel engine is the rear-mounted camshaft drive, which allows statutory pedestrian protection requirements to be met when the engine is installed longitudinally and the bonnet rises from front to rear. The valve timing mechanism is another new development and reduces friction at the 16 intake and exhaust valves, which are controlled by one overhead intake camshaft and one overhead exhaust camshaft acting via cam followers featuring hydraulic valve clearance compensation. The camshaft, Lanchester balancer and the ancillary assemblies are driven by a combination of gearwheels and just a short chain drive.
Six-cylinder CDI: increased output and fuel consumption of 6.8 litres per 100 kilometres
The V6 diesel engine for the E 350 CDI BlueEFFICIENCY Coupé is one of the most sophisticated compression-ignition units on the world market. It offers greater output, comfort and driving enjoyment than other engines thanks to the immense torque of 540 Nm alone - compared to the 510 Nm developed by the previous model - which is available between 1600 and 2400 rpm, ensuring outstanding agility when accelerating from rest and exemplary flexibility when accelerating in any gear: the vehicle accelerates from 0 to 100 km/h in 6.7 seconds. The six-cylinder unit now has an output of 170 kW/231 hp instead of 165 kW/224 hp as before.
Despite the higher output and torque, fuel consumption is considerably less than that of the previous model, amounting to just 6.8 litres per 100 kilometres, equivalent to 179 grams of CO2 per kilometre. The 7G-TRONIC seven-speed automatic transmission is specified as standard for the E 350 CDI BlueEFFICIENCY Coupé.
The Mercedes engineers have gone to great lengths to optimise the technology at the heart of the V6 diesel engine, reducing the compression from 17.7 to 15.5 and enhancing the turbocharger with a more efficient EGR cooling zone, switchable bypass duct, ceramic glow system, modified injection nozzles and optimised air ducting.
Petrol engines: new four-cylinder unit with direct injection
CGIappears at the end of the model designation of the four- and six-cylinder petrol engines for the new E-Class Coupé, signifying that Mercedes-Benz uses
direct petrol injection for all of these powerplants - a technology which allows further advances when it comes to reducing petrol consumption.
Compared to conventional port injection, direct fuel injection allows higher compression and, therefore, improved thermodynamic efficiency, saving motorists money at the pump: the new four-cylinder direct-injection powerplant consumes up to 13 percent less fuel than the previously installed supercharged engine with port injection. Power and torque, however, are much higher than in the case of the outgoing model: 150 kW/204 hp instead of 135 kW/184 hp and 310 Nm instead of 250 Nm. Hence the new CGI Coupé also boasts even more impressive performance figures: 0 to 100 km/h: 7.4 seconds instead of 9.1 seconds as before Mercedes-Benz equips the E 250 CGI BlueEFFICIENCY Coupé with a five-speed automatic transmission.
The four-cylinder engine is made almost entirely of aluminium: the crankcase is made of diecast aluminium, while a special, high-strength aluminium alloy is used for the cylinder head. Two forged overhead camshafts with variable adjustment are used to control the 16 valves. A vane-type adjuster with integrated control valve allows fast and smooth adjustment of the timing, ensuring that it is always at the optimum setting. This setup has two advantages: firstly, the variable camshaft adjustment enables a high torque yield even at low revs; secondly, this technology allows high specific outputs. The valves are controlled by means of cam followers and feature maintenance-free, hydraulic valve clearance compensation.
Thermal management: coolant circulation based on engine temperature
The Mercedes engineers have paid special attention to the engine’s warm-up governor because also has a major effect on fuel consumption. This is why the new direct-injection petrol model features an electronically controlled thermostat to ensure that circulation of the coolant is stopped when the engine is cold. This setup allows the engine oil to heat up quickly and, therefore, minimises in-engine friction. This intelligent thermal management system is logic-controlled. In other words, it is based on driving style, ambient temperatures and other parameters.
The turbocharger module, welded to the exhaust manifold on the engine’s exhaust side, features a wastegate valve and a deceleration air function for controlling the pressure characteristics. There were very good reasons for using a turbocharger in place of the previously installed mechanical supercharger - not least the higher efficiency as the engine does not need to provide the extra drive power required for the mechanical supercharger. What’s more, the turbocharger takes up far less space than the supercharger, is around four kilograms lighter and, in addition, offers better noise and vibration characteristics. The Mercedes engineers brought about a noticeable improvement in the turbocharger’s bottom-end response by incorporating newly developed turbine geometry and a cylinder-flushing process.
Direct injection: pressure of up to 140 bar and new multi-hole injectors
In the direct-injection system, the air and fuel are not mixed until they reach the combustion chambers. With the help of an injector, the fuel is injected into the cylinders at an angle of 30 degrees and, depending on the engine operating characteristics, at a pressure of up to 140 bar. Here the fuel droplets and the air particles form a mixture which is guided to the spark plugs via specially shaped recesses in the pistons. By way of comparison, the fuel pressure in a four-cylinder engine incorporating conventional injection technology is approximately 3.8 bar.
In order to ensure optimum swirl in the mixture, thus making combustion fast and as complete as possible, the CGI engine has intake ports with specially calculated flow characteristics. An adjustable swirl flap is also used so as to produce high turbulence in certain operating ranges and thus improve the combustion process. The high-pressure fuel pump is driven by the intake camshaft, while a quantity control valve integrated in the pump module ensures on-demand metering of the fuel supply. A pressure regulator with its own sensor, monitored by the engine control unit, controls the pressure in the fuel line (rail), which is directly connected to the multi-hole solenoid injectors. The four-cylinder direct-injection units operate in a homogeneous range, in other words with a stoichiometric air-to-fuel ratio of 14.7 : 1 (Lambda = 1), which is important for emission control by means of three-way catalytic converter. The new four-cylinder direct-injection engines meet the requirements of the EU 5 emission standard.
Comfort-enhancing measure: balancer in the crankcase
In addition to exemplary power delivery, low fuel consumption and low exhaust emissions, the new Mercedes four-cylinder engines have a further advantage, namely outstanding refinement, thanks in no small part to the newly developed Lanchester balancer: two forged shafts supported in three bearings, which are arranged below the crank mechanism and counter-rotate at twice the crankshaft speed. In so doing, they compensate for the inertia forces that are caused by the motion of the pistons, for example, which can lead to irritating vibrations. The aluminium housing that contains the bearing-mounted balancer shafts is located in the oil sump, where it is bolted to the crankcase from below. The crankcase also contains the controlled engine oil pump, which is driven by one of the two shafts by means of a gear pair.
Six-cylinder engine: CGItechnology with spray-guided direct petrol injection
The new E 350 CGIBlueEFFICIENCY Coupé is powered by the world’s first petrol engine with spray-guided direct injection. The six-cylinder powerplant develops 215 kW/292 hp and provides a peak torque of 365 Nm from 3000 rpm. Thanks to the state-of-the-art engine technology, which Mercedes -Benz has modified right down to the last detail, fuel consumption is reduced to 8.5 litres per 100 kilo-metres (NEDC combined figure), which is 14 percent lower than the figure for the previous model, whose V6 engine featured port injection. These exemplary performance and fuel-consumption figures are achieved using cost-efficient premium unleaded petrol (RON 95). The seven-speed automatic transmission is fitted as standard.
What’s more, the highly economical and environmentally compatible CGIpowerplant provides a unique driving experience: it takes the V6 Coupé just 6.5 seconds to accelerate from 0 to 100 km/h.
Mode of operation: stratified-charge mode, even at higher engine speeds
Mercedes-Benz was the first car manufacturer to introduce spray-guided direct petrol injection into series production in 2006. Thanks to higher thermodynamic efficiency, this technology allows better use of the fuel and, therefore, lower fuel consumption and lower exhaust gas emissions. The key benefit of the six-cylinder engine is delivered in stratified-charge mode, when the powerplant operates with a high degree of excess air and, therefore, extremely fuel-efficiently. This advantageous "lean-burn operation" is now also possible when the Mercedes direct-injection unit is running in higher engine-speed and load ranges because the combustion chambers are supplied with fuel several times in succession within a fraction of a second in every combustion cycle, thus vastly improving mixture formation, combustion and consumption.
Fast and highly precise piezo injectors are among the key components of the second-generation direct petrol injection system. They open their nozzle points outwards, forming an annular gap that is mere micrometres in size, shaping the jet of fuel and ensuring its even, hollow-cone-shaped dispersion. Thanks to their ability to switch within milliseconds, the piezo injectors also allow the multiple injection that is also of benefit for lean-burn operation, thus playing a crucial role in achieving the engine’s exemplary consumption figures. A high-pressure pump with downstream distributor and pressure valve supplies the fuel and ensures on-demand flow control. With a level of up to 200 bar, the system’s fuel pressure is several times higher than that in a conventional port injection system.
The combustion process with several injections in succession per combustion cycle developed by Mercedes-Benz also enhances the refinement and emission characteristics of the V6 engine. Tests show that untreated emissions (hydrocarbons) are reduced by more than half in the warm-up phase. Plus the specifically targeted injection and combustion control allows higher temperatures in the exhaust manifold, ensuring faster heating of the catalytic converters.
Emissions are controlled by two close-coupled three-way catalytic converters with linear lambda control, which are activated immediately after a cold start. Mercedes-Benz reduces nitrogen-oxide emissions by means of two-pipe electrically controlled exhaust gas recirculation, which directs up to 40 percent of the exhaust gases back into the cylinders, depending on the engine’s operation, and by means of two NOx storage catalytic converterson the underbody. During lean-burn operation, these catalytic converters absorb the nitrogen oxides and re-release them in short regeneration phases so that they react chemically to form harmless nitrogen.
Four valves per cylinder, variable intake and exhaust camshaft adjustment, a two-stage intake manifold, a balancer shaft and intelligent thermal management with a logic-controlled thermostat are further technical highlights of the V6 engine with direct injection. The crankcase and cylinder head are made of aluminium; the cylinders are equipped with liners that have a lightweight, low-friction aluminium-silicon coating that is stable in shape.
Precision-modified eight-cylinder engine
The eight-cylinder unit in the E 500 Coupé - the flagship powerplant in the new generation of Mercedes-Benz V engines - provides a blend of high output and torque yield with exemplary refinement and effortlessly superior agility. The extent of the powerplant’s capability is highlighted by the performance figures for the new top-of-the-range E-Class Coupé, which is equipped with the 7G-TRONIC 7-speed automatic transmission as standard: 0 to 100 km/h: 5.2 seconds
Mercedes engineers use an intelligent valve-timing concept, achieving a level of progress that is a major factor behind the excellent torque and output characteristics. An optimum supply of fresh mixture for the cylinders is assured thanks to four-valve technology and, above all, continuously variable and continuous intake and exhaust camshaft adjustment. The valves are always opened at precisely the right moment in any driving situation, significantly improving the gas cycle in the combustion chambers and reducing energy losses.
The "quadruple" continuously variable camshaft adjustment process is further enhanced by shifting camshafts, which are used to enable opening of the exhaust valves and, therefore, further improve the engine’s gas cycle. The exhaust cams are designed so that the valves open at different times during the exhaust process, depending on the firing order. As a consequence, the pressure fluctuations inherent in a V8 engine’s exhaust train are reduced. Thanks to a more constant residual-gas content, a higher knock limit and improved bottom-end and mid-range cylinder charging, the shifting camshafts increase the engine’s torque and refinement.
Modified manual transmission and consumption-optimised automatic
The Mercedes engineers have adapted the tried-and-tested six-speed manual transmission to suit the high torques of the four-cylinder engines. For instance, they equip the new E 250 CDI BlueEFFICIENCY Coupé with a modified transmission which, thanks to more effective gearing and a newly developed dual-mass flywheel, is capable of transmitting the peak torque of 500 Nm with the utmost reliability. On account of the larger gears, the transmission is around 78 millimetres longer than its counterpart for the other four-cylinder models.
The five-speed automatic transmission, available as an option for the four-cylinder CDI Coupé (standard for the E 250 CGI) has likewise been precision-modified by the Mercedes engineers and features a newly developed converter that reduces the hydraulic losses and, therefore, operates even more fuel-efficiently than previously. In "C" mode, the transmission meets the most stringent of requirements in terms of fuel consumption, comfort and output, while "S" mode offers a more sportier configuration with an appropriately adapted gear-change strategy and accelerator pedal characteristic. Optional extras for the AMG Sports package include "M" mode, which has been specially configured for the keenest of drivers.
Standard equipment for the new V6 and V8 E-Class Coupé models includes a seven-speed automatic transmission. In "C" mode, the 7G-TRONIC offers a consumption-optimised transmission mode that is always active after the engine is started.
Chassis and suspension
The newly developed AGILITY CONTROL suspension with standard-fit amplitude-dependent damping system forms the basis for the further enhanced ride comfort and agile handling of the E-Class Coupé. The shock absorbers adapt to the current driving situation, reducing the damping forces automatically when driving normally with low shock-absorber impulses and increasing the forces up to the maximum as required when cornering at speed or performing evasive manoeuvres. In this way, the chassis and suspension meet stringent requirements in terms of road roar, tyre vibration and agility - without ever compro-mising on active safety.
What’s more, the longer wheelbase (an extra 45 millimetres), wider track (an extra 33 and 70 millimetres respectively) as well as the positioning of the engine low down and far towards the rear make a fundamental contribution to the new, agile driving experience by producing a favourable centre of gravity. The even axle load distribution ensures an almost perfect balance between the front and rear axles, as well as improved traction and handling stability.
Shock absorbers: adjustment of the damping forces in line with the current driving situation
The AGILITY CONTROL shock absorber system - fitted as standard - is purely hydromechanical and requires no sensors or electronics. The core components are a bypass channel in the shock absorber’s piston pin and a control piston moving within a separate oil chamber. When linear travel of the shock absorber is low, the control piston forces oil through the bypass channel to produce a significantly smaller damping force at the actual damper valve. The resulting, "softer" shock absorber characteristic translates into a high level of ride comfort. If the excitation of the shock absorber is greater, the control piston moves to its limit position so that oil ceases flowing through the bypass duct, meaning that the full damping force is available.
Mercedes-Benz has enhanced the three-link front suspension with McPherson struts in a number of different respects, achieving excellent results in terms of ride comfort in particular. In the interests of favourable axle kinematics, superior vibration characteristics and enhanced safety, the lower link level consists of two separate elements which act as torque and cross struts. As well as offering more precise wheel location, this design has the particular advantage of compensating vibrations caused by tyre imbalance and fluctuating braking forces better than rigid wishbones. It also provides longer deformation paths in the event of a frontal collision. The third front-axle link is the track rod which connects the transversely installed steering gear to the wheels.
The spring struts consist of cylindrical, transverse force-compensating coil springs, double-tube shock absorbers and newly developed three-phase head bearings. In order to further optimise ride comfort, a starkly upright position has been chosen for the spring strut so as to reduce the forces acting on the torque strut bearing. As a consequence, it was possible to reduce the bearing rigidity, which has a positive effect on the chassis’ tyre/road contact characteristics and rolling characteristics - for example when driving over expansion joints running across the road. The anti-roll bar is connected to the spring strut, which is likewise actively involved in locating the front wheels.
Intelligent use of aluminium and steel reduces the weight of the front axle by twelve percent compared to the outgoing model. The forwards-slanting torque struts and the cross struts are made of aluminium.
Subframe: robust high-strength-steel construction
The front-axle components, steering gear, engine and transmission are pre-mounted on a high-strength-steel subframe which is bolted securely to the bodyshell’s side members, making it a key component in the front crash structure of the new Coupé: in the event of a frontal impact, the subframe forms a separate load-bearing path along which the impact energy is absorbed at specific points. The stiffness at the connecting points between the subframe and the body where load is transferred as a result of the forces and vibrations produced by the chassis and suspension has been increased substantially, all of which translates into more agile and more precise handling.
Steering: more direct for agile handling
The Mercedes Coupé’s AGILITY CONTROL suspension is complemented by a likewise newly developed rack-and-pinion steering system. This operates with a ratio of 14.5, and is therefore around seven per cent more direct than on the outgoing model. Positioning the steering gear 80 millimetres in front of the wheel centre makes for predictable self-steering characteristics with a slight tendency to understeer.
The steering gear housing and valve body are made of aluminium, while the rack is forged from high-strength steel. Thanks to further optimisation of all components with respect to installation space and weight, the steering gear is around 0.8 kilograms lighter than the version in the outgoing model.
Drivers can adjust the steering column to their liking within a height adjustment range of +/- 25 millimetres and a reach adjustment range of 35 millimetres - well in excess of the standard in this vehicle category. A fully electrically adjustable steering column is included if the optional Memory package is ordered.
To greatly enhance occupant safety, the steering column has been designed to collapse telescopically by up to 100 millimetres when hit by the driver with a certain degree of force in the event of a frontal collision. This extended deformation path reduces the forces exerted on the driver’s head and chest area.
As an optional extra, Mercedes-Benz also offers speed-sensitive power steering. This adapts the power assistance to the vehicle speed: the lower the speed, the greater the assistance. Up to a speed of 200 km/h the steering effort is continuously reduced as a function of vehicle speed, which means that only one third of the maximum steering effort is required when parking at slow speed. Variable centring is another new feature adopted from the S-Class: the electro-hydraulic speed-sensitive servo valve is used to generate a centring moment that increases with the speed and gives a secure and stable feeling in the straight-ahead position. At slow speeds, this additional steering moment is not activated, so the benefits of the power steering can be exploited to the full.
The power steering pump features an electrically controlled solenoid valve which controls a bypass opening and, as a result, allows metering of the oil quantity in line with requirements. This setup reduces the pressure and oil quantity when driving straight ahead, for example – the power steering pump operates with a substantially reduced output and, consequently, helps to save fuel.
Rear axle: further developed multi-link independent suspension
Mercedes-Benz’s multi-link independent suspension, which has proven itself time and again over a period spanning more than 25 years, has been further modified for use in the new E-Class Coupé in order to meet more stringent requirements in terms of comfort and agility. Modified components include the subframe, subframe carrier, struts and hub carriers/steering knuckles. In keeping with the lightweight design concept, wheel location components such as struts, hub carriers and the metal sections of the elastomer bearings are largely made of aluminium. The rear-axle subframe is made of high-strength steel.
Optional equipment: sports suspension and dynamic handling package
Alongside the standard-fit AGILITY CONTROL suspension with adaptive damping system, the new E-Class Coupé offers two further options for adapting the suspension to the driver’s individual requirements. One of these optional extras is the AGILITY CONTROL sports suspension with sports-tuned speed-sensitive power steering, stiffer springs, tauter shock absorbers and stronger torsion bars. When cornering or performing evasive manoeuvres at speed, this sporty suspension tuning translates into noticeably lower body roll.
Further optional equipment available includes a dynamic handling package developed specially for the E-Class Coupé (standard for the E 500 Coupé), which solves the classic suspension-tuning trade-off by offering a choice of two modes: Sport or Comfort. These modes allow continuously-variable electronic control of the shock absorbers based on seven sensor signals.
The system adjusts the damping force for each wheel individually and fully automatically, depending on the current road conditions and driving situation. When driving normally on poor road surfaces, a soft damper setting is selected to give the occupants maximum comfort while maintaining excellent handling stability and safety. If the driver decides that more brisk progress is called for, however, the shock absorber settings are continuously adapted to meet the need for more dynamic performance.
The driver can pre-program the principle vehicle characteristics at the push of a button. In Sport mode, the hydraulic forces of the shock absorbers are increased so as to allow even better directional stability and road adhesion at high speeds as well as reduce understeer at speeds of up to 120 km/h.
Speed-sensitive sports steeringwith variable centring is also part of this package. To enhance agile handling, the steering ratio has been reduced from 14.5 to 13.5; the steering torque is increased at speeds above 80 km/h to provide a more sporty steering feel. Furthermore, the system adjusts the accelerator pedal characteristics in Sport mode in order to ensure more spontaneous engine response. If the Coupé is fitted with an automatic transmission, the gear-change characteristics are also altered, while the gear-change times are shorter and the driver can change gear even more quickly by using the shift paddles on the steering wheel.
Body Index: outstanding agility without compromising on ride comfort
In order to allow comparison of the suspension characteristics, Mercedes engineers have developed the "Body Index" concept - a composite formula for handling dynamics, which is calculated from the readings for various typical driving manoeuvres. The Body Index is an indication of how well the suspension is linked to the body, how closely the car hugs the road and how nimble the handling is through fast bends. In other words, how taut the suspension settings are. The higher the figure, the sportier, i.e. firmer, the suspension characteristics.
The Body Index for the E-Class Coupé with AGILITY CONTROL suspension fitted as standard is 2.0; this figure is around ten percent higher than that for the out-going model and, thanks to adaptive shock absorber control, is achieved without compromising on ride comfort. If the Coupé is equipped with the dynamic handling package, the Body Index is between 1.89 (Comfort) and 2.06 (Sport).
Brakes: with Hill-Start Assist, Hold function and brake drying function
With the ADAPTIVE BRAKE, the E-Class Coupé offers an innovative braking system incorporating additional assistance functions for enhanced comfort and safety. One example of this is the practical HOLD function: after the two-door model has been braked to a standstill, briefly pressing the brake pedal a little further is all that is required to activate this function. The car is then held by the brakes, even if the driver’s foot comes off the brake pedal. In this way, the ADAPTIVE BRAKE prevents the car from rolling forwards inadvertently when stopped at traffic lights or stuck in stop-and-go traffic and from rolling backwards when facing up a slope. The HOLD function is deactivated automatically when the car moves off.
If the driver’s foot moves abruptly from the accelerator to the brake pedal before an emergency stop, the brake system increases the pressure in the brake lines and brings the pads into contact with the brake discs so that maximum braking power is available as soon as the driver hits the brake pedal. This priming of the brakes allows the system to assist the standard-fit Brake Assist system.
The ADAPTIVE BRAKE enhances safety in the wet by sending brief braking pulses at regular intervals to remove the film of moisture from the brake discs, allowing the brakes to work to full effect. This automatic brake drying function is always activated when the windscreen wipers have been operating for a certain time; the driver never even notices these precisely metered brake pulses. Finally, the ADAPTIVE BRAKE assists the driver with hill starts. If the sensors detect that the car is stopped on an uphill slope, a hill-start-assist function is activated automatically, maintaining a constant brake pressure for a brief period to prevent the car from rolling backwards. The driver therefore has enough time to move their foot from the brake pedal to the accelerator without having to use the foot-operated parking brake.
Brake discs: larger and even more effective than before
Large front and rear brake discs provide an ideal technical basis for ensuring safe and reliable deceleration in any driving situation. The front and rear discs measure up to 344 millimetres and 300 millimetres in diameter respectively, depending on the engine version.
For brake cooling, the Mercedes engineers have developed two-section aluminium cover plates which have been tested in the wind tunnel and ensure that, whilst driving, the cool air flows from the underbody into the wheel arches and, finally, to the brake discs.
Control systems: electronics for safe motoring
When it comes to active safety systems too, the E-Class Coupé features an array of state-of-the-art technology as standard, including anti-lock brakes, acceleration skid control, Brake Assist and the Electronic Stability Program. For ESP®, Mercedes-Benz has developed control logic that offers the driver even more effective assistance in critical cornering situations: precisely measured brake pulses sent to up to three wheels cause a moderate reduction in the car’s speed and help it to turn safely into bends.
ESP® Trailer Stabilisation, which is activated if the Coupé is equipped with a trailer coupling, detects dangerous oscillating movements of the trailer and restabilises it automatically by sending precisely measured brake pulses to the front wheels of the towing vehicle. If the danger is even more acute, the system applies the brakes to reduce the car’s speed automatically whilst reducing the engine torque before the precisely measured brake pulses are sent to the wheels to stabilise the trailer.
As an option, Mercedes-Benz can equip the Coupé with a pivoting trailer coupling, whose ball head needs to be neither fitted nor removed again. Instead it pivots away beneath the body together with its electrical socket, so that it is concealed from sight when not in use. The E-Class Coupé has a maximum trailer load of up to 1800 kilograms (braked).
The Electronic Stability Program monitors the tyre inflation pressure too, and warns the driver if there is a sudden loss of pressure in one of the tyres. To this end, the system continuously compares the rotational wheel speeds, which mainly depend on the vehicle speed, vehicle load and tyre pressures. The control unit also consults other dynamic ESP®sensor readings, such as the lateral acceleration, yaw rate and wheel torque, to help it diagnose tyre pressure loss. The system is therefore able to detect any deviations, and informs the driver accordingly via the central display.
To ensure continued mobility in the event of a flat tyre, Mercedes-Benz also offers run-flat tyres as an option. These are available in 245/45 R 17 format and feature self-supporting sidewalls, enabling Mercedes customers to continue driving for a distance of up to 50 kilometres at a maximum speed of 80 km/h, depending on the vehicle load.
Wheels and tyres: 16-inch wheels as standard
The range of wheels and tyres for the new E-Class Coupé offers a wealth of personalisation options. Mercedes customers have a choice of wheel and tyre combinations in 17- or 18-inch format. The four-cylinder models are equipped with 16-inch nine-spoke light-alloy wheels and 215/55 R 16 tyres as standard. As a no-cost option, Mercedes -Benz can also supply 205/55 R 16 tyres with extremely low rolling resistance and special light-alloy wheels whose weight has been reduced by a total of 9.6 kilograms thanks to sophisticated forging technology.
Mercedes-Benz equips the V8 Coupé with 235/40 R 18 front tyres and 255/35 R 18 rear tyres as standard.