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Page 1 : BMW M6 Page 2 : M Power to the 10th power: BMW M’s all-new (...) Page 3 : 7-speed Sequential Manual Gearbox:advanced (...) Page 4 : M6 suspension: targeted modifications Page 4 : M Electronic Damping Control Page 4 : M Variable Differential Lock: putting power to the (...) Page 5 : Servotronic steering with two effort levels Page 5 : Wheels and tires: ultimate grip and style Page 5 : Specially calibrated, variable Dynamic Stability (...) Page 6 : MDrive: M technology at the driver’s (...) Page 6 : Special M instrumentation Page 6 : Merino leather, Extended or Full treatments Page 6 : Special interior trim Page 6 : Safety and security features: comprehensive (...) Page 6 : Options: almost everything is standard 7-speed Sequential Manual Gearbox:advanced technology for optimum performanceInitially, the M6 is offered exclusively with this unique SMG transmission, which employs Formula 1 racing technology to help drivers extract the M5’s full performance potential. For M6 customers who prefer a conventional manual transmission, a 6-speed will be offered later. This amazing new system does everything a manual transmission can do, plus several things a manual can’t:
This is the first SMG designed and developed right from the start as an SMG; Two BMW M generations and the simpler system offered in regular-production BMWs were created by adding SMG controls to a conventional manual transmission. This has sweeping implications for how the concept operates and what it can do:
DRIVELOGIC shift programs, 11 of them. In this respect, the new transmission parallels BMW M’s 6-speed SMG, offered on M3s since 2002. There are two basic shift modes: Sequential (S), in which most shifting is initiated by the driver; and Automated (D, for Drive), in which operation is similar – but by no means identical – to that of a automatic transmission. Within these two modes, there are as before a total of 11 shift programs:
In S6, the sportiest program of all, minimum shift time is reduced 20% from the existing SMG – already very fast. In everyday driving, shifts are now smoother. As in the existing SMG, gears are shifted electrohydraulically; shifting is controlled by a 16-bit microprocessor that can make up to 12 million calculations per second. Special functions and safeguards. The 7-speed SMG incorporates a number of special functions and safeguards, some familiar and some new: Launch Control. In S6, the driver can utilize a further SMG capability. Dynamic Stability Control must be de-activated via its console button. Then the driver holds the shift lever forward (as if for a downshift) and presses the accelerator pedal fully down. This raises the engine to 1600 rpm. Ready to go, the driver now releases the shift lever. Engine speed rises immediately to 8000 rpm; the M6 launches with precisely balanced clutch slip and wheelspin for an optimum start. From there, the driver upshifts as desired – most likely at the redline, as maximum performance is the point of the exercise. Thus utilized, Launch Control gives essentially the same standing-start acceleration results as an expert driver. To preclude overheating the clutch, the system requires several minutes between Launch Control starts. Automatic downshift to 1st gear for starting off from rest, whether in D or S mode. If the mode selector is in D, upshifts will then occur automatically; or the driver can initiate the upshifts. Overspeed protection. If the driver calls for a downshift (S mode) that would overspeed the engine, the downshift command is ignored. Slip Control. If a downshift occurs on a slippery road, SMG disengages the clutch for a split second to prevent sudden wheel slip that could de-stabilize the vehicle. Start-off Assistant. When stopped facing uphill, the driver simply holds the brake pedal until ready to start off. Upon release of the brakes, the M5 is ready (for 1 second) to start off without rolling back. Hill Detection. Depending on road gradient, down- or uphill, the D shift points are modified for optimum gear selection. In S, shift times are shortened so that the engine is always “on point” for best acceleration uphill, or engine braking downhill. Double-clutching. In D or S mode, DRIVELOGIC coordinates clutch disengagement, shifting, engine speed and clutch engagement to accomplish smooth downshifts – just as a skilled driver would. 2nd-gear start in D1 program: Starting up from rest, the transmission is in 2nd rather than 1st; the clutch engages delicately. Although the traction-control function is also there to prevent it, this reduces the chance of even transitory wheelspin.
1 comments: BMW M6
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Posted on
10.15.2007 @ 13:32