GF42.40-P-2100RT ASC Drive Torque Control Circuit, Function

GF42.40-P-2100RT ASC drive torque control circuit, function

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-SFI [ME] control unit (N3/10) via the Controller Area Network bus Class C (engine compartment) (CAN-C).

The ME-SFI [ME] control unit causes the throttle valve position to be reduced via the throttle valve actuator (M16/6) relative to the accelerator pedal position specified by the driver and the ignition timing to be retarded. In the ESP control unit a check is constantly made as to whether the control function can be canceled in view 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 occurs at the drive wheels when the throttle is closed, this is detected by the ESP control unit. The signal for throttle valve position is reported to the ME-SFI [ME] control unit via CAN C. The calculated throttle valve opening is controlled by the ME-SFI [ME] control unit via the throttle valve actuator.

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 by the ESP warning lamp (A1e41).