| 摘要 |
<p>PURPOSE:To improve a restoring property at the time of releasing the hold and obtain a good steering feeling by controlling an electric motor for assistingly steering a steering shaft in a condition of releasing the hold of a steering wheel based on the steering angle and vehicle speed at that time. CONSTITUTION:A steering shaft 2 steered by a steering wheel 1 is assisted in its steering by means of an electric motor 6 via a reduction gear 5. In this case, a torque sensor 7 for detecting the steering force of the steering wheel 1 and a steering angle sensor 8 for detecting the steering angle thereof are installed on the steering shaft 2. Based on the detected signals of the sensors 7, 8 and a vehicle speed, an electric motor 6 is controlled by a motor-driven power steering control device 9. That is, a returning force is operated based on the steering angle and vehicle speed in a condition that a driver released his hold of the steering wheel 1, to control the electric motor 6. Thereby, a restoring property at the time of releasing the hold can be improved obtaining a favorable steering feeling.</p> |
