Variable gain servo assist

Details Variable gain servo assist Variable gain servo assist

B - Operations, Transporting

62

D

B62D 5/08 (2006.01) B60G 17/0195 (2006.01) B62D 5/09 (2006.01) B62D 6/02 (2006.01)

Patent

CA 2092998

A variable gain control apparatus (100) for a servo assist system (10) includes a position sensor (56), a valve (26), a con- troller (34) and an actuator (30). The valve (26) has an actuated member (72) and a variable flow orifice (80) to communicate hy- draulic fluid between the high pressure supply line (18) and a reservoir (16) of hydraulic fluid. The position of the actuated mem- ber (72) determines the cross-sectional area of the variable flow orifice (80). The position sensor (56) determines the present position of the actuated member (72). The controller (34) determines a position error between the present position of the actuated member (72) and a varying prededtermined position of the actuated member (72). The actuator (30) in response to the position error actuates the actuated member (72) to eliminate the position error so that assist pressure to the servo assist system (10) is vari- ed as a function of the varying predetermined position.

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