Power steering device and method of controlling the power steering device

A power steering and control method technology, which is applied in the direction of automatic steering control components, steering mechanisms, steering rods, etc., can solve problems such as insufficient steering power and bad loads, and achieve the effect of smooth switching control and reduced manipulation physical strength
CN1835861AInactive Publication Date: 2006-09-20HITACHI LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
HITACHI LTD
Publication Date
2006-09-20
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A power steering device, comprising a hydraulic power cylinder (5) assisting the steering force of a rack and pinion mechanism (4) and a first hydraulic pressure supply mechanism (8) having a first trochoid pump (23) and a first electric motor (24) selectively supplying hydraulic pressure to both hydraulic pressure chambers (15a) and (15b) through first and second passages (6) and (7). When the first hydraulic pressure supply mechanism fails, a second hydraulic pressure supply mechanism (11) selectively supplies working hydraulic pressure to both hydraulic pressure chambers through third and fourth passages (9) and (10) according to instruction signals from a control unit (14). Since a steering assist force is actively given to the rack and pinion mechanism (4) by the second hydraulic pressure supply mechanism (11), a steering wheel operating force given by a driver can be reduced.
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Description

technical field

[0001] The present invention relates to a power steering apparatus (power steering system) for applying steering assist by manipulating a hydraulic power cylinder in response to the magnitude of steering torque output from a steering mechanism of a motor vehicle, and more particularly to control of the power steering system method. Background technique

[0002] A power steering system disclosed in the following patent application designated by "Document 1" is generally regarded as such a power steering system.

[0003] The power steering system disclosed in this document consists of a steering shaft on which a steering wheel is mounted, an output shaft connected to the lower end of the steering shaft, mounted on the lower end of the output shaft, a rack-and-pinion mechanism for steering the steering wheels, and A rack-connected hydraulic power cylinder of a rack-and-pinion mechanism, and a reversible pump selectively supplying working fluid to a first hydrau...

Claims

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