OPERATION



IGNITION SWITCH ON


Ignition supply voltage is applied to the EPS-ECU, and the ECU enters standby mode.




  1. When the engine is started, the engine speed signal sent from the engine-ECU is input to the EPS-ECU.
  2. After starting the engine, the EPS-ECU judges the engine status "ENGINE SPEED ON" when the engine speed reaches 500 r/min, then the power assist function is ready.

STEERING WHEEL OPERATION





  1. When the steering wheel is operated, the torque sensor integrated into the column shaft detects the steering torque and outputs the torque sensor signal (main and sub), which varies with the steering force, to the EPS-ECU.
  2. The EPS-ECU outputs the current in proportion to the torque sensor signal to the motor.
  3. The motor outputs the rotational torque (assist torque) in proportion to the current intensity and assists the power steering gear.

FAIL-SAFE FUNCTION OPERATION


During the fail-safe mode, the electric power steering operates as a manual steering system.