Torque Vectoring Control

The ABS module continuously monitors the vehicle motion relative to the intended course. This is done by using sensors to compare the steering wheel input, the yaw rate sensor input, the lateral acceleration sensor input and the longitudinal acceleration sensor input with that of the actual vehicle motion. On vehicles without adaptive steering, the SCCM sends the steering wheel angle information to the ABS module over the HS-CAN2. On vehicles with adaptive steering, steering angle information is sent by the SASM over the HS-CAN2. Vehicle roll rate, yaw rate, lateral acceleration and longitudinal acceleration information are sent to the ABS module from the RCM also over the HS-CAN2. If the ABS module determines the vehicle is experiencing over-steer or under-steer, the module sends a torque vectoring control message over the HS-CAN2. The GWM relays this message to the PCM over the HS-CAN1 and to the IPC over the HS-CAN3. When the PCM receives this message, it assists with curve control by adjusting engine timing and decreasing fuel injector pulses. When the IPC receives this message, it flashes the stability-traction control indicator (sliding car icon). The ABS module continues to monitor the sensor inputs while the PCM assists with torque vectoring control. If the ABS module determines PCM intervention is insufficient to control the stability event, the ABS module modulates brake pressure to the appropriate brake caliper(s) by opening and closing the appropriate solenoid valves inside the HCU while the hydraulic pump motor is activated. Once the vehicle instability has been corrected, the ABS module returns the solenoid valves in the HCU to their normal position, deactivates the hydraulic pump motor and sends another message over the HS-CAN2 indicating the event has ended. The PCM returns engine timing and fuel injectors to normal operation and the IPC extinguishes the sliding car icon.