ELECTRIC POWER STEERING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an electric power steering device capable of getting a good steering feeling even if tire spring components are changed with the acceleration/deceleration and the forward/reverse condition of a vehicle. SOLUTION: An acceleration/deceleration operation part 51 finds acceleration/ deceleration dV in accordance with a car speed (including forward/reverse information) detected by a car speed detector 14. A front wheel load operation part 52 finds a front wheel load change amount KT in accordance with the acceleration/deceleration dV. Frequency characteristics of a phase compensation part 53 are varied to stabilize a system in accordance with the front wheel load change amount KT. A main controlled variable setting part 54 corrects a main controlled variable IT in accordance with the front wheel load change amount KT. A damping correction value setting part 56 corrects a damping correction value D in accordance with the front wheel load change amount KT. The damping correction value D is subtracted from the main controlled variable IT by a subtracter 55 to find a corrected controlled variable ITH. The corrected controlled variable ITH is supplied to an electric motor driving part 40 to control a current to be supplied to an electric motor 10.