Hydrostatic power steering system having reduced wheel slip

Details Hydrostatic power steering system having reduced wheel slip Hydrostatic power steering system having reduced wheel slip

1998-02-23

1999-10-05

Nguyen, Hoang

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91375R, 60384, 180412, 180415, 180422, F15B 903, F16D 3102

Patent

active

059606940

ABSTRACT:
A hydrostatic power steering system comprising a fluid motor (19) which receives pressurized fluid from a controller (17) in response to the rotation of a vehicle steering wheel (W). As the motor (19) or the steered wheels reach the stops, control logic (31) receives signals (37,77) representing steered wheel and steering wheel position, respectively, and generates appropriate command signals (33,27) to a pressure reducing/relieving valve (15) and to a proportional electromagnetic valve (23), respectively, closing the valve (15) somewhat, and opening the valve (23). A pressure differential is built between an additional fluid path (21) and the high pressure conduit (15c) between the controller (17) and the fluid motor (19). Pressure is communicated through the valve (23) into the conduit (51c), and back into the fluid meter (43) of the controller, preventing any further rotation thereof in response to an attempt to turn the steering wheel, thus eliminating travel limit slip.

REFERENCES:
patent: 3801239 (1974-04-01), Larson
patent: 4703819 (1987-11-01), Hosotani
patent: 4792008 (1988-12-01), Hosotani
patent: 5020618 (1991-06-01), Nagao
patent: 5136844 (1992-08-01), Stephenson et al.
patent: 5289892 (1994-03-01), Notsu
patent: 5303636 (1994-04-01), Stephenson et al.

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