| 摘要 |
The power steering apparatus for assisting the return of a steering wheel by the rotating force of a motor for assisting steering force wherein noting the fact that the steering torque when the steering wheel is being returned is within the dead zone, whether the steering wheel is being returned is judged on the basis of the steering torque detected by a torque sensor and the terminal voltage of the motor, and the direction and magnitude of a driving current for the motor when the steering wheel is being returned are determined corresponding to the vehicle speed. Accordingly, the steering wheel is returned to the neutral position without using a steering angle sensor. A power steering apparatus to drive a motor for assisting steering force without any time delay by adjusting a temporary control value obtained corresponding to the detected signal of a torque sensor with a differentiated value of the detected signal wherein the effective detection width of the steering torque to obtain the differentiated value is wider than the effective detection width of the steering torque to obtain the temporary control value.
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