GF42.40-P-2100S ASR Drive Moment Control Circuit, Function

GF42.40-P-2100S ASR drive moment control circuit, function

Acceleration slip regulation (ASR)
Acceleration slip regulation is required to achieve optimum traction if the drive torque is too high (wheels spinning). The drive moment reduction is controlled by data exchange between the ESP control unit (N47-5) and the respective control unit of the injection and ignition system via the CAN data bus.

The engine control unit reduces the position of the throttle valve via the throttle valve positioner according to the accelerator pedal position specified by the driver and the ignition timing is also reduced.

In the ESP control unit (N47-5) it is constantly checked whether, for example, the control functions can be canceled as a result of a sudden improvement in road adhesion in order to again permit as soon as possible the drive torque specified by the driver via the accelerator pedal.

MSR engine friction torque control
If slip occurs at the drive wheels when the throttle is closed, this is detected by the ESP control unit (N47-5)

The signal (increase throttle valve) is sent to the engine control unit over the CAN data bus. The control unit opens the throttle valve via the throttle valve positioner to the calculated position.

Using this information the drive torque can be changed so that no slip occurs at the drive wheels. This improves the lateral stability of the vehicle. This process takes place without the driver being informed (warning lamp A1e41).