Patent ID: 7159394
Filing Date: 2007-01-09
Classification: B62D

Abstract:
1. A power steering system in a vehicle provided with a power steering output section that power-assists a steering operation of a steering wheel in accordance with a supply amount of an operating oil, the system comprising: a steering angle sensor to detect a steering angle of the steering wheel; a steering speed-computing section to differentiate the detected steering angle of the steering wheel to compute a steering speed signal thereof; a low-pass filter to cut high-frequency components in the steering speed signal to output a correction steering speed signal; a high-speed steering-determining section to determine a high-speed steering condition based on the steering speed signal; a switching section to switch a cut-off frequency in the low-pass filter to be higher at the time of determining the high-speed steering condition; a flow quantity-computing section to compute a target flow quantity supplied to the power steering output section based on the steering angle signal and the correction steering speed signal; and a flow control section to control a flow quantity of the operating oil supplied to the power steering output section according to the target flow quantity.