| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an electric power steering device variably controlling damping force according to the road surface state. <P>SOLUTION: The electric power steering device has a steering angle sensor 11; a steering torque sensor 12; a base current setting part for setting a base current corresponding to auxiliary steering force based on the steering torque; a damping compensation current base value setting part 31 for setting a damping compensation current base value corresponding to the damping force for attenuating steering based on a steering speed obtained by differentiating the steering angle; a rack shaft force presumption part 33 for presuming load applied in an axial direction of the rack shaft as the rack shaft force; and a damping correction coefficient setting part for setting damping correction coefficient for correcting the damping force based on the rack shaft force. The damping compensation current is calculated by multiplying the damping correction coefficient on the damping compensation current base value, and the auxiliary steering force is generated based on the base current and the damping compensation current. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
