ASR drive torque control circuit, function - GF42.40-P-2100GZ

MODEL 164 

Acceleration slip regulation (ASR) 

In order to achieve optimum traction for a too large drive torque (spinning wheels), the drive torque must be controlled. The drive torque reduction is controlled by the data exchange between the ESP control unit (N47-5) and the ME control unit (N3/10) via the Controller Area Network bus class C (engine compartment) (CANC).

Through the ME control unit the throttle valve position is reduced by the throttle valve actuator (M16/6) relative to the accelerator pedal position specified by the driver and the ignition timing is retarded. The ESP control unit constantly checks whether the control functions can be canceled as a result of a sudden improvement in road adhesion.

So the drive torque specified by the driver via the accelerator pedal can be permitted again in good time.

Engine braking regulation control (MSR) 

If slip at the drive wheels is detected when the throttle is closed, then this is detected by the ESP control unit. The signal of the throttle valve position is transmitted to the ME control unit via the CAN-C. Through the ME control unit the calculated throttle valve opening is regulated by the throttle valve actuator.

With 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 occurs without the driver being informed via the ESP warning lamp (A1e41).