Roll Stability Control (RSC)

The roll stability control (RSC) system monitors the roll-rate sensor and existing stability assist sensors and calculates if the vehicle may be approaching a situation where rollover is probable. If such a situation exists, the RSC system applies preemptive action. When activated, the RSC system adjusts the brake torque at specific wheels in response to direct measurement of the vehicle roll motion. By adjusting brake torque, the system can reduce the cornering forces and, therefore, the total roll moment acting on the vehicle. Systems with RSC have an additional roll-rate sensor located within the sensor cluster and additional programming within the ABS module to help control the vehicle during sudden maneuvers.

Information from the roll-rate sensor is fed into the ABS module. The computer uses information from the ABS wheel speed sensors, the throttle position sensor, the steering wheel angle, the steering wheel rate of change, and a yaw rate sensor that measures the change in vehicle direction. If the computer determines from all these inputs that conditions exist for a potential roll over, the system applies 1 or more brakes and reduces engine torque to make the vehicle more stable.