Dynamic Stability Control (DSC)

Dynamic Stability Control (DSC) uses brakes and powertrain torque control to assist in maintaining the lateral stability of the vehicle. While the ignition is energized the DSC function is permanently enabled, unless selected off using the DSC switch.

DSC enhances driving safety in abrupt maneuvers and in under-steer or over-steer situations that may occur in a bend. The ABS control module monitors the yaw rate and lateral acceleration of the vehicle and the steering input, then selectively applies individual brakes and signals for powertrain torque adjustments to reduce under-steer or over-steer.

In general:

• In an under-steer situation, the inner wheels are braked to counteract the yaw movement towards the outer edge of the bend
• In an over-steer situation, the outer wheels are braked to prevent the rear end of the vehicle from pushing towards the outer edge of the bend.

The ABS control module monitors the tracking stability of the vehicle using inputs from the wheel speed sensors, the SASM, and the yaw rate sensor. The tracking stability is compared with stored target data. Whenever the tracking stability deviates from the target data, the ABS control module intervenes by applying the appropriate brakes.

The following interactions occur in an intervention situation:

• High speed (HS) Controller Area Network (CAN) powertrain systems bus signal to the Powertrain Control Module (PCM), to reduce engine torque
• Application of braking to the appropriate corner of the vehicle.