Patent ID: 7663330

Claim:
An electric power steering device comprising: a motor for providing a steering assist torque; a target current determination device that determines a target current value of the motor in accordance with a steering state of a steering wheel; an actual current detection device that detects a current value actually supplied to the motor; a feedback control device that determines a control amount that drives and controls the motor by feeding back a deviation between the target current value determined by the target current determination device and the actual current value detected by the actual current detection device; a motor drive device that drives the motor with the control amount determined by the feedback control device; an actual current change detection device that detects a state of change of the actual current value actually supplied to the motor which is detected by the actual current detection device; a control amount change detection device that detects a state of change of the control amount of the motor determined by the feedback control device; and a stroke end judgment device that judges that a steering position has reached a stroke end that mechanically restricts a terminal end of a steerable range based on the detected state of change of the actual current value and the detected state of change of the control amount of the motor.