摘要 |
PROBLEM TO BE SOLVED: To provide an electric power steering device capable of obtaining good steering feeling and high steering stability, even if variation in characteristics of components structuring a steering mechanism exist. SOLUTION: The electric power steering device comprises a steering range estimating means estimating a steering range in which a steering wheel has been started to turn at not less than predetermined vehicular speed and from a straight-ahead state wherein an electric motor is not controlled, on the basis of vehicular speed, a torque sensor value, and a rotation angle of the electric motor, without a steering angle sensor; an actual steering stiffness calculating means calculating steering stiffness from change amount of the torque sensor value to rotation angle change of the electric motor in the steering range; a deviation calculating means calculating a deviation between the calculated actual steering stiffness and target steering stiffness stored in advance; and a correcting means correcting a control map in case that the deviation is not less than a predetermined value. COPYRIGHT: (C)2006,JPO&NCIPI |