Power steering apparatus

Details Power steering apparatus Power steering apparatus

2007-01-02

2007-01-02

Kershteyn, Igor (Department: 3745)

Power plants

Pressure fluid source and motor

Expansible chamber type volumetric responsive measuring...

C060S473000, C180S422000

Reexamination Certificate

active

11232864

ABSTRACT:
A power steering apparatus includes a hydraulic power cylinder, and a reversible pump driven by a motor. A steering assist sensor senses a steering assist force provided to a steering wheel. A controller ascertains a pump discharge quantity of the reversible pump, and a cylinder volume variation of the pressure chambers of the hydraulic power cylinder; and calculates a leak quantity of the reversible pump from a difference between the pump discharge quantity and the cylinder volume variation. The controller controls the motor to cause the motor to produce a desired fluid pressure in accordance with the steering assist force and the leak quantity.

REFERENCES:
patent: 6152254 (2000-11-01), Phillips
patent: 6152717 (2000-11-01), Morita et al.
patent: 6161069 (2000-12-01), Fujita
patent: 6283243 (2001-09-01), Bohner et al.
patent: 6513620 (2003-02-01), Igawa et al.
patent: 0 999 114 (2000-05-01), None
patent: 2000-142434 (2000-05-01), None

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