All-wheel control
The dynamic stability control (DSC) specifies the target value for 4-wheel drive control with xDrive. The DSC control unit calculates the locking moment for the multi-plate clutch in the transfer box. The nominal value depends on the tendency of the vehicle to oversteer or understeer and the wheel slip. The target value is sent on the PT-CAN to the VTG control unit. The VTG control unit reports the actual set locking moment back to the DSC control unit. The DSC control unit calculates the locking moment of the multidisc clutch as follows:
- Pre-activation = driver request
- Driving dynamics control
- Detection of different tire rolling circumferences