Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1986-07-10
1987-09-08
Love, John J.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
180141, B62D 508
Patent
active
046917977
ABSTRACT:
A power steering system includes a hydraulic pump and a hydraulic steering mechanism. A flow control orifice passes fluid from the pump to the steering mechanism and generates a hydraulic control signal proportional to the fluid flow rate therethrough. A flow control valve is connected between the pump to bypass fluid away from the steering mechanism in response to the hydraulic control signal. A solenoid operated valve is located in a pilot fluid circuit between the pump and the flow control orifice to vary the hydraulic control signal in response to an electrical control signal. The electrical control signal is a pulse width modulated signal having a duty cycle proportional to vehicle speed. Maximum power assist occurs when vehicle speed is below a predetermined value and decreases with increasing vehicle speed above the predetermined value.
REFERENCES:
patent: 3384020 (1968-05-01), Searle
patent: 4300650 (1981-11-01), Weber
patent: 4320812 (1982-03-01), Takaoka et al.
patent: 4513835 (1985-04-01), Funkino et al.
patent: 4570662 (1986-02-01), Anderson
patent: 4570667 (1986-02-01), Masica et al.
patent: 4574905 (1986-03-01), Asano et al.
patent: 4619339 (1986-10-01), Fotaba et al.
U.S. Ser. No. 738,601, Cage et al., filed May 28, 1985.
SAE Paper No. 841198, "Development of an Electronically Controlled Power Steering System", by Yamaguchi et al., Oct. 1, 1984.
SAE Paper No. 700881, "A New Power Steering Pump for Heavy Duty Trucks", by C. A. Searle, Nov. 4, 1970.
Love John J.
McGiehan Donn
TRW Inc.
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