POWER STEERING SYSTEM GENERAL


  1. OUTLINE


    1. The Electric Power Steering (EPS) system uses a motor and a reduction mechanism that are built into the steering gear housing to generate assist torque, in order to assist the driver's steering effort.

    2. The EPS system actuates the motor only during steering when torque assist is required. As a result, the EPS system does not consume any energy during straight line driving, thus achieving fuel economy.

    3. On models with a 2GR-FXE engine, the HV battery voltage is decreased to 46 V by the power steering converter, and then supplied to the motor.

    4. On models with a 2AR-FSE engine, the auxiliary battery voltage is converted to 8 to 16 V by the power steering ECU assembly, and then supplied to the motor.

    5. The EPS system performs control in cooperation with the brake control system. The power steering ECU assembly controls the assist torque for the motor based on the assist torque request sent from the skid control ECU.

    6. The EPS system performs control in cooperation with the lane-keeping assist system. The power steering ECU assembly controls the assist torque for the motor based on the steering assist request sent from the driving support ECU assembly.