Motor vehicles – Surface effect vehicles – Dynamic seal or fluid curtain
Patent
1994-08-01
1995-08-29
Hill, Mitchell J.
Motor vehicles
Surface effect vehicles
Dynamic seal or fluid curtain
91375A, 180142, 180143, 180149, B62D 508
Patent
active
054452392
ABSTRACT:
A motor vehicle power steering system including a hydraulic pump, a fluid motor, and an electronic control valve which regulates boost pressure independent of pump discharge flow rate so that the pump does not require a constant flow valve. The flow area of a throttling orifice which determines the magnitude of boost pressure depends on the magnitude of a pilot pressure in a pilot pressure chamber behind a valve spool of the electronic control valve. The pilot pressure is regulated by a solenoid controlled pintle. The duty cycle of the solenoid is controlled in open-loop fashion by an electronic control module of the power steering system in response to signals from a steering wheel torque sensor of the power steering system. Fluctuations in the discharge flow rate of the hydraulic pump attributable to changes in engine speed induce spool movements to increase or decrease the flow area of the throttling orifice to maintain boost pressure consistent with the scheduled pilot pressure. A direction control valve responds to the direction of steering wheel torque to expose either a right turn or left turn working chamber of the fluid motor to boost pressure.
REFERENCES:
patent: 3367354 (1968-02-01), Gallant
patent: 3881567 (1975-05-01), Leiber
patent: 4373871 (1983-02-01), Christ
patent: 4530414 (1985-07-01), Fukino et al.
patent: 4549468 (1985-10-01), Trintignac et al.
patent: 4557342 (1985-12-01), Drutchas
patent: 4570667 (1986-02-01), Masica et al.
patent: 4586536 (1986-05-01), Karmel
patent: 4623031 (1986-11-01), Drutchas et al.
patent: 4627509 (1986-12-01), Adams et al.
patent: 4629025 (1986-12-01), Brasier et al.
patent: 4745985 (1988-05-01), Nakayama et al.
patent: 4760892 (1988-08-01), Duffy
patent: 4781262 (1988-11-01), Nakamura et al.
patent: 4828067 (1989-05-01), Duffy
patent: 4877099 (1989-10-01), Duffy
patent: 4926956 (1990-05-01), Duffy
Magnus Brian J.
Miller Randy S.
General Motors Corporation
Hill Mitchell J.
Schwartz Saul
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