The EPS (Electronic Power Steering) system generates torque through the operation of the motor and the reduction gear installed on the column shaft in order to assist power steering effort.
The power steering ECU determines the direction and the amount of assisting power in accordance with the vehicle speed signals and signals from the torque sensor built into the steering column assembly. As a result, steering effort is controlled to be light during low speed driving and moderately high during high speed driving.
  1. Power steering ECU:
    The power steering ECU calculates assisting power based on steering torque signals from the torque sensor and vehicle speed signals from the skid control ECU.
    For vehicles without ABS, the power steering ECU receives vehicle speed signals from the speedometer.

  2. Torque sensor:
    The torque sensor detects the steering effort generated when the steering wheel is turned and converts it to an electrical signal.

  3. Power steering motor:
    The power steering motor is activated by the current from the power steering ECU and generates torque to assist the steering effort.