Controlled torque power steering system

B - Operations – Transporting – 62 – D

Patent

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Details

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.

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