Patent ID: 6843342
Filing Date: 2005-01-18
Classification: B62D

Abstract:
1. A power steering system, comprising: a steering valve ( a variable orifice (a) provided upstream from the steering valve ( a solenoid (SOL) for controlling a degree of opening of the variable orifice (a); a controller (C) for controlling a solenoid current instruction value (SI) used for driving the solenoid (SOL); a steering angle sensor ( a flow control valve (V) for distributing a flow supplied from a pump (P), to a control flow (QP) supplied to the steering valve (V) in accordance with the degree of opening of the variable orifice (a), and a return flow (QT) circulating back to a tank (T) or the pump (P), the controller (C) calculating or storing a current instruction value (I multiplying each of the current instruction value (I applying a current instruction value (I selecting a larger value out of the two current instruction values below these limit values, and determining the selected value as a solenoid current instruction value (SI).