Variable assist power steering system with electro-hydraulic wor

Details Variable assist power steering system with electro-hydraulic wor Variable assist power steering system with electro-hydraulic wor

1995-01-20

1996-09-10

Hurley, Kevin

Motor vehicles

Steering gear

With fluid power assist

180421, 180441, 91459, B62D 600

Patent

active

055536832

ABSTRACT:
A variable assist power steering system for a motor vehicle has an electronically controlled working pressure valve which normally maintains a working pressure at a relief pressure but increases it in response to steering of the vehicle and according to vehicle status, such as vehicle speed. The system also has electronically controlled direction control valves which are actuated to selectively reduce the working pressure to one side or the other of the steering gear piston so as to match a measured handwheel torque with a value which is desired for the vehicle status.

REFERENCES:
patent: 4643227 (1987-02-01), Suzuki et al.
patent: 4760892 (1988-08-01), Duffy
patent: 4877099 (1989-10-01), Duffy
patent: 4905783 (1990-03-01), Bober
patent: 4926956 (1990-05-01), Duffy
patent: 5232195 (1993-08-01), Torrielli
patent: 5293953 (1994-03-01), Edahiro
patent: 5307892 (1994-05-01), Phillips
patent: 5328147 (1994-07-01), Stobbs
patent: 5346175 (1994-09-01), Hunnicutt
patent: 5377720 (1995-01-01), Stobbs et al.

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