Patent ID: 7051834
Filing Date: 2006-05-30
Classification: B62D

Abstract:
1. A power steering apparatus for generating a steering assisting force by hydraulic pressure generated by a pump driven by an electric motor, the apparatus comprising: steering detecting means for detecting the steering by an operation member for steering; driving-target-basic-value setting means for setting a driving target basic value for driving said electric motor on the basis of an output signal of said steering detecting means; temperature detecting means for detecting a temperature of said electric motor; temperature-coefficient setting means for setting a temperature coefficient, which becomes smaller as the temperature of said electric motor becomes higher, on the basis of an output of said temperature detecting means; driving-target-value setting means for setting a driving target value for driving said electric motor by multiplying the driving target basic value set by said driving-target-basic-value setting means by the temperature coefficient set by said temperature-coefficient setting means; motor driving means for driving said electric motor on the basis of the driving target value set by said driving-target-value setting means; and steering-direction detecting means for detecting whether the steering by said operation member comprises steering-wheel-turning steering, which is steering in a direction away from a midpoint of a steering angle, or steering-wheel-returning steering, which is steering in a direction toward the midpoint of the steering angle, wherein said driving-target-basic-value setting means sets the driving target basic value corresponding to the angular velocity of steering such that the driving target basic value at the time of steering-wheel-turning steering becomes larger than the driving target basic value at the time of steering-wheel-returning steering.