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Power-steering-apparatus

Electronically controlled power steering system

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Power steering apparatus

Details

Inventors: Nishimoto, Mitsuhiko;
Assignee: Koyo Seiko Co., Ltd. (Osaka, JP)
Primary Examiner: Bollinger; David H.
Assistant Examiner:
Attorney, Agent or Firm: Townsend and Townsend Khourie and Crew

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.

DETAILED DESCRIPTION The present invention has been devised to solve the aforementioned problems.
A first object of the present invention is to provide a inexpensive power steering apparatus capable of controlling a motor for assisting steering force without using a steering angle detector when a steering wheel is being returned.
A second object of the present invention is to provide a power steering apparatus capable of differentiating the steering torque in a wider range, to control the driving current of an assisting motor, thereby achieving good responding efficiency of a steering mechanism to the steering torque in the wider range.
The above and further objects and features of the invention will more fully be apparent from the following detailed description with accompanying drawings.

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