| 摘要 |
PURPOSE: An electric power steering device is provided to secure stable behavior of a vehicle and to increase drivability by controlling an electric current of a motor according to the traveling conditions and achieving a function of increasing and decreasing steering auxiliary force. CONSTITUTION: An electric power steering device comprises a steering force-auxiliary control part(10) comprising a traveling condition calculation part(8) and a control current calculation part(9); a first subtractor(A1); and a second subtractor(A2). The traveling condition calculation part calculates a vehicle model from steering angle information detected from a steering angle sensor(3) and determines the bending degree of a road to assume traveling conditions of the vehicle. The control current calculation part compares the speed information of the vehicle detected from a vehicle speed sensor(2) with the traveling condition information determined from the traveling condition calculation part according to the bending degree of the road and calculates a control current of a motor(7) required to obtain the optimum steering auxiliary force under the current traveling condition of the vehicle. The first subtractor finds a difference between a desired current set from a desired current calculation part(4) and the control current calculated from the control current calculation part. The second subtractor finds a difference between the difference found from the first subtractor and a real current detected from a current detection part(6) and outputs the difference to a current control part(5).
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