Power steering system and control valve

摘要

A power steering system employs a valve (21) which directly controls the direction of flow of steering fluid and the degree of pressure of the steering fluid. In another aspect of the present invention, a sensor (35) is used to detect steering wheel induced torque. The sensor supplies a signal to an electrical control unit (37) which, in turn, sends a signal to an electromagnetic device (201) controlling a spool (211) within a valve (21). In a further aspect of the present invention, a non-rotary valve (21) controls steering fluid pressure and flow through left and right turn assist outlets (81 and 83). In still another aspect of the present invention, a valve (21) employs a pair of bores (73 and 75) within which spools are linearly movable by electromagnetic devices (201). In yet another aspect of the present invention, a valve (21) is provided for controlling the magnitude and direction of steering fluid pressure and flow to a steering cylinder (29); the valve is not mechanically engaged with a rotating member of the steering system.