Observation of the Driving Condition

The Integrated Chassis Management (ICM) control unit calculates the current driving situation from the signals listed below. This essentially means the longitudinal and lateral dynamic driving condition.

• Wheel speed signals from all four wheels
• Longitudinal acceleration
• Lateral acceleration
• Yaw rate

The ICM control unit therefore knows how the vehicle is actually moving at this point.

To be able to optimize the vehicle behavior, the dynamic driving systems require information about how the driver wishes the vehicle to move. The driver's command is determined from the following signals:

• Accelerator pedal angle and current engine torque and gear ratio
• Application of the brake pedal and current brake pressure
• Effective steering angle and steering-angle speed.

The driving condition and driver's command are provided both internally and externally by the ICM control unit. The central driving dynamics control acts as a receiver internally in the ICM control unit. The control units of the dynamic driving systems (e. g. DSC) are the external receivers. They receive the driving condition and the driver's command from the ICM control unit via the FlexRay bus system.