Patent ID: 6098741
Filing Date: 2000-08-08
Classification: B62D

Abstract:
In an on demand hydraulic assist steering system, a controlled torque steering system (10) comprising:means for selecting (24) a predetermined amount of desired assist in steering;a torque sensor (12) for sensing a torque of a steering wheel shaft and establishing a signal indicative thereof;a controller (18) in communication with and responsive to said selecting means (24) and said torque sensor (12) for receiving the torque signal therefrom, said controller having means for processing the torque signal (14, 16) to generate a control output signal, said processing means (14, 16) of said controller including means for delaying (16) response time of the control output signal for providing the control output signal at a preset rate; andmeans for varying flow (20) of hydraulic fluid to a steering unit (22), said flow varying means (20) being in communication with said controller (18) and responsive to the output signal therefrom.