Power steering system

Details Power steering system Power steering system

2006-05-09

2010-02-23

Hurley, Kevin (Department: 3611)

Motor vehicles

Steering gear

With fluid power assist

Reexamination Certificate

active

07665569

ABSTRACT:
A power steering system includes a hydraulic power cylinder having a first and a second hydraulic chambers, for assisting a steering force of a steering mechanism, a first and a second oil passages respectively connected to the first and second hydraulic chambers, a reversible pump discharging operating oil and providing oil pressure to the hydraulic power cylinder through the first and second oil passages, and a motor connected to the reversible pump and rotating the reversible pump in normal and reverse directions. A steering load detection unit detects a steering load of a steering wheel for steering of the steered road wheels, and a motor control unit outputs a control signal to the motor to bring an actual oil pressure generated by the reversible pump closer to a desired oil pressure determined based on the detected steering load. A discharge amount per rotation of the reversible pump is smaller than or equal to 5 cc.

REFERENCES:
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patent: 5711394 (1998-01-01), Fujii et al.
patent: 6978859 (2005-12-01), Torizawa
patent: 7210554 (2007-05-01), Sugiyama et al.
patent: 7213676 (2007-05-01), Soeda et al.
patent: 7427191 (2008-09-01), Kurata et al.
patent: 2004-276664 (2004-10-01), None

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