Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1985-04-26
1986-12-09
Pekar, John A.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
B62D 506
Patent
active
046275096
ABSTRACT:
A power assistance steering system 10 for a vehicle comprises steering gear 12 having an internal hydraulic ram supplied with hydraulic fluid by a pump 14 from a reservoir 16 via a solenoid valve 18 controlled by a micro-processor 20 which also controls an electric motor 22 for driving pump 14. Steering input torque is sensed by a torque sensor 36 and steering direction is sensed by a direction switch 34. Output signals from these devices are fed to micro-processor 20 which controls solenoid valve 18 and pump motor 22 accordingly, varying the motor speed in accordance with the pressure requirements of the steering ram as sensed by the torque sensor. In a further embodiment the pump is driven at a constant speed and a proportional control valve 74 is controlled by a micro-processor 78 to vary the fluid pressure supply.
REFERENCES:
patent: 3991846 (1976-11-01), Chichester et al.
patent: 4476529 (1984-10-01), Nakamura
patent: 4540059 (1985-09-01), Shibahata et al.
patent: 4557342 (1985-12-01), Drutchas
Adams Frederick J.
Heap Kenneth J. D.
Pekar John A.
TRW Cam Gears Limited
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