BRAKE CONTROL SYSTEM


  1. SYSTEM CONTROL


    1. If the driver suddenly applies the brakes on a road surface with a considerable difference in friction coefficient between the right and left wheels, the difference in the brake force between the right and left wheels will cause the vehicle posture to become unstable and create a yaw moment. In this state, the skid control ECU controls the VSC to stabilize the vehicle posture.

    2. The skid control ECU effects cooperative control with the power steering ECU assembly to provide steering torque assist, which facilitates the driver's steering maneuvers to stabilize the vehicle posture.

      A01FJLNC01
      B004H73 Brake Force B004HAI Steering Torque Assist Direction
      A01FJG8 Yaw Moment during Brake Controlling A01FJ6A Slippery Surface

    3. If the driver suddenly starts off or accelerates on a road surface with a considerable difference in friction coefficient between the right and left wheels, the slippage of a drive wheel will cause the vehicle posture to become unstable and negatively affect its acceleration performance. In this state, the skid control ECU causes the TRC to control the hydraulic brake of the slipping drive wheel, and makes a request to the ECM to effect engine output control.

    4. The skid control ECU effects cooperative control with the power steering ECU assembly to provide steering torque assist, which facilitates the driver's steering maneuvers to stabilize the vehicle posture.

      A01FJKFC01
      B004H73 Drive Force B004HAI Steering Torque Assist Direction
      A01FJG8 Yaw Moment during Acceleration A01FJ6A Slippery Surface

    5. When the skid control ECU determines a front wheel skid tendency, it controls the VSC to dampen the front wheel skid, and makes a request to the ECM to effect engine output control.

    6. The skid control ECU effects cooperative control with the power steering ECU assembly to provide steering torque assist, which controls the driver's steering maneuvers to stabilize the vehicle posture. Steering torque assist is provided to inform the driver of a front wheel skid, and to prevent the driver's excessive turning of the steering wheel. In the assist for preventing excessive turning, it increases the resistance to counter the driver's steering effort, if the driver turns the steering wheel excessively.

      A01FJGTC01
      B004H73 Brake Force B004HAI Steering Torque Assist Direction (to Inform of Front Wheel Skid)
      A01FJG8 Moment of Force to Restrict Front Wheel Skid A01FJCC Steering Torque Assist Direction (to Prevent Excessive Turning)

    7. When the skid control ECU determines a rear wheel skid tendency, it controls the VSC to dampen the rear wheel skid, and makes a request to the ECM to effect engine output control.

    8. The skid control ECU effects cooperative control with the power steering ECU assembly to provide steering torque assist, which facilitates the driver's steering maneuvers in the appropriate direction to correct the rear wheel skid.

      A01FJJUC01
      B004H73 Brake Force B004HAI Steering Torque Assist Direction
      A01FJG8 Moment of Force to Restrict Rear Wheel Skid A01FJCC Rear Wheel Skid Moment