Pressure responsive and electrically controllable flow control a

Details Pressure responsive and electrically controllable flow control a Pressure responsive and electrically controllable flow control a

1988-08-01

1990-08-14

Hill, Mitchell J.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

91433, 91452, 417300, B62D 508

Patent

active

049479512

ABSTRACT:
A power steering system includes a bypass valve for bypassing fluid from a main fluid conduit connected between an engine-driven, power steering pump and an actuatable, open-center, steering control valve which is actuated upon turning of a vehicle steering wheel. When the steering control valve is actuated, the demand for fluid through the steering control valve to a power steering motor increases. The fluid pressure in the main conduit varies as a function of the demand for fluid to the steering control valve. The bypass valve is urged toward an open condition by a fluid pressure signal. The bypass valve is urged toward a closed condition by a spring and by a fluid pressure which varies as a function of the demand for fluid to the steering control valve and as a function of an electrical signal which varies as a function of at least one vehicle operating parameter, such as vehicle speed. The fluid pressure which urges the bypass valve toward a closed condition is controlled by (i) a pressure responsive pilot valve assembly which is responsive to the fluid pressure in the main conduit and (ii) a solenoid operated pilot valve assembly which is responsive to the electrical signal which varies as a function of vehicle speed.

REFERENCES:
patent: 3384020 (1968-05-01), Searle
patent: 4320812 (1982-03-01), Takaoka et al.
patent: 4513835 (1985-04-01), Fukino et al.
patent: 4691797 (1987-09-01), Miller
patent: 4702335 (1987-10-01), Cage et al.
patent: 4768605 (1988-09-01), Miller et al.

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