Power steering apparatus

Details Power steering apparatus Power steering apparatus

1994-09-29

1996-09-24

Boehler, Anne Marie

Motor vehicles

Steering gear

With fluid power assist

180429, 91375A, 13762521, 13762565, B62D 509

Patent

active

055581773

ABSTRACT:
A power steering apparatus including an electric motor for operating a hydraulic pump which supplies pressurized fluid, a directional control valve of center-closed type operable by a steering wheel for delivering the pressurized fluid supplied by the hydraulic pump selectively to a pair of cylinder chambers of a power cylinder through a supply passage, and motor controller for controlling the electric motor. While the steering wheel is at its neutral position, the controller drives the electric motor intermittently at such a low speed that does not deteriorate the efficiency of said electric motor so much so that differential pressure between a pressure at the supply passage and a higher one of pressures in the pair of cylinder chambers is returned to a predetermined first value.

REFERENCES:
patent: 4618017 (1986-10-01), Liebert et al.

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