Operation

GENERAL INFORMATION

OPERATION

IGNITION SWITCH ON

Ignition supply voltage is applied to the electric power steering-ECU, and the ECU enters standby mode.





1. When the engine is started, the engine speed signal sent from the engine control module (ECM) is input to the electric power steering-ECU.

2. After starting the engine, the electric power steering-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





3. When the steering wheel is operated, the torque sensor integrated into the gear box detects the steering torque and outputs the torque sensor signal
(main and sub), which varies with the steering force, to the electric power steering-ECU.

4. The electric power steering-ECU outputs the current in proportion to the torque sensor signal to the motor.

5. 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.