BMW 2001 Annual Report Download - page 186

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56
BMW Brand
M3 SMG Drivelogic  Formula 1 feeling with direct gearshift on the steering wheel. While the driver of a
conventional car moves the shift lever in the classic H-configuration when changing gear, the driver of a
Formula 1 racing car only has to touch two paddles behind the steering wheel, shifting up on the right and
down on the left while keeping his foot fully on the accelerator pedal.
BMW M, in close cooperation with Getrag and Sachs, has successfully converted this technology in
motorsport to a practical experience on the road, developing a new high-performance drive concept now
entering the market in its second generation as the BMW Sequential M Gearbox (SMG II with Drivelogic)
in the M3.
All gears are shifted electrohydraulically, the control elements operating instantaneously, safely and
reliably by wire, without mechanical connection. To shift gears, the control unit activates the solenoid
valves within thousandths of a second, thus masterminding the overall hydraulic system. Highly advanced
electronic actuators then interrupt the power of the engine for milliseconds, the control unit shifting gears
and engaging/disengaging the clutch hydraulically  so that a clutch pedal is now no longer required. The
fastest gearshift takes only 80 milliseconds, operating at a speed and with a standard of precision hardly
any human being is able to match.