Steering force control device for power steering apparatus

Details Steering force control device for power steering apparatus Steering force control device for power steering apparatus

1986-09-09

1988-01-12

Mitchell, David M.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

180133, 180141, B62D 508

Patent

active

047185147

ABSTRACT:
An apparatus for controlling a steering force of a vehicle which uses a power steering apparatus in which a driving shaft for a sub-pump for feeding pressure oil into a hydraulic pressure reaction chamber provided internally of a main valve and a main pump for supplying pressure oil for the power steering apparatus is made common to both said pumps to increase an discharge amount and hydraulic pressure of the sub-pump. When speed information and steering angle information of the vehicle are obtained, the hydraulic pressure fed to the hydraulic pressure reaction chamber is controlled by a throttle means subjected to numerical control by output signal of the controller which is provided with predetermined data according to the travelling state of the vehicle and the other throttle means by way of analog control wherein a variation of road resistance is sensitively transmitted as a variation of hydraulic pressure to vary an opening in response thereto, thus always obtaining a proper steering force. The controller further processes an engine revolution information in addition to the foregoing informations to thereby provide a failsafe function for the steering force control device according to the present invention.

REFERENCES:
patent: 4189024 (1980-02-01), Jablonsky
patent: 4593783 (1986-06-01), Honaga

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