Patent ID: 6945351
Filing Date: 2005-09-20
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-angular-velocity calculating means for calculating the angular velocity of steering by an operation member for steering; steering-angular-acceleration calculating means for calculating the angular acceleration of steering based upon said calculated angular velocity of said steering by an operation by said operation member; driving-target-basic-value setting means for setting a driving target basic rotational speed value for driving said electric motor on the basis of an output signal of said steering-angular-velocity calculating means; correction-value setting means for setting a correction rotational speed value for correcting the driving target basic rotational speed value, wherein the correction value is directly proportional to an output of said steering-angular-acceleration calculating means when the output is close to zero and when the output is not close to zero; driving-target-value setting means for setting a driving target rotational speed value for driving said electric motor by correcting the driving target basic rotational speed value set by said driving-target-basic-value setting means by the correction rotational speed value set by said correction-value setting means; and motor driving means for driving said electric motor on the basis of the driving target rotational speed value set by said driving-target-value setting means.