POWER STEERING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a power steering apparatus that can efficiently suppress a change in steering assist force on the basis of pressure loss occurring in piping or the like due to the change of viscosity in a working fluid.

SOLUTION: On the basis of steering angular velocity ω estimated by a steering angle θ detected by a steering angle sensor 73 and a tank fluid temperature Tf calculated (estimated) in a tank fluid temperature estimator 90, assist current Io for driving and controlling an electric motor 50 is corrected and controlled in a manner to be increased when the steering angular velocity ω is higher and when the tank fluid temperature Tf is lower.

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