Drive Torque Control Circuit

Wheel Spin Threshold:

The Drive Torque Control Circuit builds on the electronic components of ABS/ASR and is supplemented by the electronic accelerator system. The electronic accelerator consists of the following electronic and mechanical components:

^ Accelerator pedal position sensor,
^ Electronic accelerator throttle valve actuator,
^ Electronic accelerator control unit,
^ Control linkage and accelerator,
^ Telescoping rod (backup linkage).

The ABS/ASR control unit constantly processes the wheel speed signals from the wheel speed sensors for the following values:

^ Drive wheel spin,
^ Acceleration,
^ Vehicle speed (front wheel speed),
^ Identification of turns.

If the monitored values exceed specific thresholds, the ABS/ASR control unit signals the electronic accelerator control unit to reduce throttle opening. Thus the actuator starts to close the throttle valve, independently of the position of the accelerator pedal.


Depending on the vehicle speed, the drive torque control circuit activates as soon as the speed difference increases above the spin threshold. Closing, holding and opening (up to the position selected by the driver) the throttle valve controls the drive torque. If the speed difference falls below the spin threshold again, the throttle valve opens to correspond with the accelerator pedal position selected by the driver.