Patent ID: 6474437
Filing Date: 2002-11-05
Classification: B62D

Abstract:
A power steering system for a motor vehicle, the power steering system having hydraulic power support, the motor vehicle including a in steering wheel and wheels to be steered, the power steering system comprising:a steering gear having an input element and an output element, the output element being connected to the wheels to be steered; a steering gear shaft connected to the steering wheel and to the input element of the steering gear; a steering valve; a servo pump; a power boosting system including a servo motor having two working chambers, the servo pump supplying a hydraulic fluid to the two working chambers through the steering valve in response to a torque applied to at least one of the steering gear shaft and the input element; at least one first sensor arranged on the steering gear shaft, the at least one first sensor being configured to detect at least one of an angle of rotation and a torque; a second sensor mounted on one of the output element and the input element, the second sensor being configured to detect a steering angle; a returning device configured to provide hydraulic power support to return the steering gear and the wheels to be steered after the steering wheel is released after a steering operation; and a common, electronically controlled electromagnetic valve configured to control an intensity and a direction of the hydraulic power support and the returning of the wheels to be steered; wherein the at least one first sensor includes a single steering force sensor configured to detect a steering force, the steering force sensor including at least one of a force sensor and a torque sensor.