Side-Wind Stabilization

The ABS module continuously monitors the various stability control sensors to monitor for a sudden side-wind gust and applies the brakes on once side of the vehicle to reduce the effect of the wind gust.

The PSCM sends the steering wheel angle information to the ABS module over the HS-CAN2. The RCM sends yaw rate sensor, lateral accelerometer and roll rate sensor information to the ABS module over a private HS-CAN. If the ABS module determines side-wind stabilization is necessary, the ABS module modulates brake pressure to the appropriate brake calipers by opening and closing the appropriate solenoid valves inside the HCU while the hydraulic pump motor is activated. At the same time, the ABS module calculates how much engine torque reduction is required to help stabilize the vehicle and sends this torque reduction message to the GWM over the HS-CAN2, the GWM relays this message to the PCM over the HS-CAN1. The ABS module also sends a vehicle stability event message to the GWM over the HS-CAN2, the GWM relays this message to the IPC over the HS-CAN3. When the PCM receives the torque reduction message, it adjusts engine timing and decreases fuel injector pulses to reduce the engine torque to the requested level. When the IPC receives the vehicle stability event message, it flashes the stability-traction control indicator (sliding car icon) and a message may appear in the message center. The system does not activate for a continuous side-wind or during turns.

Once the side-wind gust subsides, the ABS module returns the solenoid valves in the HCU to their normal position, deactivates the hydraulic pump motor and stops sending the stability event and torque reduction messages. The PCM returns engine timing and fuel injectors to normal operation and the IPC extinguishes the stability-traction control indicator (sliding car icon).