ELECTRIC POWER STEERING SYSTEM

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Outline

•  A column assist type Electric Power Steering (EPS) has been adopted.
•  EPS provides smooth handling from low to high speeds as a result of the excellent steering feel provided by the electronic control and the vehicle-speed responsive control.
•  The EPS Control Module (CM) has been integrated with the EPS motor, resulting in a size and weight reduction. (With Lane-Keep Assist System)
•  The automatic configuration function and the steering wheel angle neutral position automatic learning function have been adopted.

Structural View

L.H.D. (Without Lane-Keep Assist System)

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L.H.D. (With Lane-Keep Assist System)

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R.H.D. (Without Lane-Keep Assist System)

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R.H.D. (With Lane-Keep Assist System)

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System Wiring Diagram

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Purpose/Function

•  The EPS assists the manual steering mechanism operation using the EPS motor to provide supplemental manual power during steering operation, reducing the load on the driver.

Construction

•  The EPS consists of the following parts:
―  Manual steering mechanism
Consists of the steering wheel, steering column, steering column and shaft, steering gear and linkage.
―  Electric assist mechanism
Consists of the EPS CM built in the steering column, torque sensor, reduction gear, and EPS motor integrated in the EPS CM.
―  Control system
Controls based on the EPS CM, torque sensor, reduction gear, EPS motor, and vehicle speed and engine speed signals input from the PCM.

Operation

1.  Steering force generated by the driver's steering wheel operation is detected by the torque sensor which is built in the steering column and shaft, and is output to the EPS CM as a steering torque signal.

2.  The EPS CM calculates optimum assist force based on the steering torque signal from the torque sensor and the vehicle speed and engine speed signals from the PCM, and outputs electric current to drive the EPS motor.

3.  The EPS motor is driven by the current from the EPS CM and the force is transmitted to the intermediate shaft via the reduction gears, thus assisting steering operation of the driver.

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