Hitachi, Ltd.

Nissan Motor Company Limited

Noburo Sugiura

Masato Fukino

Sadahiro Takahashi

Yasuo Noto

Hideyuki Ouchi

Two torque sensors (201, 202) are arranged for detecting the steering force which is added to the motor-driven power steering apparatus. One torque sensor is selected by the command signal from the micro computer (80), for controlling the auxiliary steering force from the motor-driven actuator (5) by the command signal from the micro computer (80).

Motor-driven power steering apparatus

An electro-motive power steering system includes a torque sensor for detecting a steering force exerted to a steering wheel, a motor controlled in accordance with the output of the torque sensor, a steering angle sensor for detecting a steering angle, acceleration/deceleration deciding circuit for deciding based on the outputs of the torque sensor and the steering angle sensor whether the steering of the steering wheel is accelerated or decelerated, and a function generator for generating a function of either one of acceleration or deceleration in accordance with the result of the decision by the acceleration/deceleration deciding circuit, wherein a steering assisting force corresponding to the acceleration or deceleration of the steering of the steering wheel is applied to the steering wheel.

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Mito, Japan

Noburo Sugiura