Acceleration Slip Regulation (ASR)

To achieve optimum traction if the drive torque is too high (wheel spinning), acceleration slip regulation is required. Control of torque reduction is achieved by data transfer between the control module of the built-in ASR (acceleration slip regulation) traction control system (N47-1) or ESP (N47-5) and the corresponding control module for the injection and ignition system via the CAN data bus. With gasoline engines these control modules are: EFP (N4/1), LH (N3/1, N3/2, N3/3), HFM (N3/4) or ME (N3/10, N3/11, N3/12) and with diesel engines the control modules are ERE (N3/7), EVE (N3/8) or CDI (N3/9).

Four cylinder gasoline engine with supercharger, 6, 8, and 12 cylinder gasoline engines: Control module EFP (N4/1) or ME (N3/10, N3/11, N3/12) reduces the throttle valve position on the throttle valve positioner (M16/1 or M16/6) with respect to the accelerator pedal position set by the driver and/or retards the ignition timing from the HFM control module (N3/4), ME (N3/10, N3/11, N3/12) or ignition control unit (N3/1).

Four cylinder gasoline engine without supercharger: The fuel feed is switched off by the HFM control module (N3/4).

Diesel engine: The quantity of fuel is reduced by the ERE control module (N3/7), EVE (N3/8) or CDI (N3/9).

A continuous check takes place in the ASR or ESP control module (N47-1 or N47-5) whether, e.g. because of suddenly improved road adhesion, the control function can be canceled so as to permit the drive torque desired by the driver via the accelerator pedal as soon as possible.