B - Operations – Transporting – 62 – D
Patent
B - Operations, Transporting
62
D
B62D 6/10 (2006.01) B62D 5/065 (2006.01) B62D 6/02 (2006.01) B62D 6/08 (2006.01)
Patent
CA 2150849
A controlled torque power assist steering system for a vehicle for controlling the level of power assist provided by an hydraulic power assist steering mechanism in response to torque exerted on a steering wheel of the vehicle by a driver. The system includes a torque sensor mounted on the steering column of the vehicle which senses the torque exerted thereon as the steering wheel is turned. The torque sensor generates a corresponding torque signal which is applied to an electronic controller, which in turn generates a current control signal to an electronically variable orifice (EVO) actuator valve. In a first embodiment, the value of the current control signal is based upon a predetermined response curve of input torque versus EVO drive current. In a second embodiment, a vehicle speed signal is also supplied to the controller and the desired response curve is varied in accordance with changes in vehicle speed. The preferred form of the controller comprises a microcomputer-based digital controller that controls the EVO actuator valve using pulse width modulation control.
Carlson David K.
Curnow John W.
Padula Santo A.
Rea Irvin B.
Sherman David J.
Borden Ladner Gervais Llp
Lectron Products Inc.
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