Patent ID: 7966114
Filing Date: 2011-06-21
Classification: B62D

Abstract:
1. An electric power steering device comprising: an electric actuator that is driven to generate a steering assist torque in accordance with steering operation of a steering wheel; a torque information acquisition portion that acquires steering torque information regarding the steering torque input through the steering operation of the steering wheel; an other information acquisition portion that acquires steering state information regarding a steering state other than the steering torque information, or vehicle state information regarding a vehicle state; a basic assist control amount calculation portion that calculates a basic assist control amount based on at least information acquired from the torque information acquisition portion; a plurality of compensation control amount calculation portions that calculate compensation control amounts to compensate the basic assist control amount based on information acquired from the other information acquisition portion; a target assist control amount calculation portion that calculates a target assist control amount by uniting the basic assist control amount calculated by the basic assist control amount calculation portion, and the compensation control amounts respectively calculated by the plurality of compensation control amount calculation portions; an actuator control portion that drives and controls the electric actuator based on the target assist control amount calculated by the target assist control amount calculation portion; and a compensation control amount correction portion that corrects the compensation control amounts by (a) multiplying the compensation control amounts calculated by at least two or more compensation control amount calculation portions of the plurality of compensation control amount calculation portions by a control gain that changes in accordance with the steering torque information, or (b) by summing the compensation control amounts calculated by at least two or more compensation torque control amount calculation portions of the plurality of compensation control amount calculation portions and multiplying the summed compensation control amounts by the control gain.