Power steering device

Details Power steering device Power steering device

2005-11-18

2010-06-08

Morris, Lesley D (Department: 3611)

Motor vehicles

Steering gear

With fluid power assist

C180S417000, C180S442000

Reexamination Certificate

active

07730993

ABSTRACT:
In a power steering device, a hydraulic power cylinder is configured to assist a steering force of a steering mechanism linked to steerable road wheels, a pump is configured to supply a hydraulic pressure to respective pressure chambers of the hydraulic power cylinder, an electric motor is configured to drive the pump, a torque sensor is configured to detect a steering torque of the steering mechanism, an operating load state detecting circuit is configured to detect an operating load state of the pump based on a viscosity resistance characteristic of a working oil, and an electric motor control circuit is configured to output a drive signal to the motor on the basis of a torque signal from the torque sensor and the operating load state of the pump.

REFERENCES:
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patent: 4834205 (1989-05-01), Mizuno et al.
patent: 5762159 (1998-06-01), Matsuoka et al.
patent: 6161069 (2000-12-01), Fujita
patent: 6250418 (2001-06-01), Shimizu et al.
patent: 6366842 (2002-04-01), Kaji et al.
patent: 7226069 (2007-06-01), Ueda et al.
patent: 2003/0000765 (2003-01-01), Spadafora
patent: 2000-142434 (2000-05-01), None

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