Patent ID: 8260500

Claim:
An electric power steering apparatus, comprising: a steering torque detector that detects steering torque of a steering wheel; an electric motor that applies steering assist force to the steering wheel; a current detector that detects an actual current actually supplied to the electric motor; a target current setting unit that sets a target current to be supplied to the electric motor, on the basis of the steering torque detected by the steering torque detector; a proportional controller that performs a proportional action of multiplying, by a proportional gain, a value corresponding to a current deviation between the target current set by the target current setting unit and the actual current detected by the current detector; an integral controller that performs an integral action of multiplying, by an integral gain, an integral value obtained by integrating the value corresponding to the current deviation; and an addition unit that adds together an output value from the proportional controller and an output value from the integral controller and outputs a command value to the electric motor, at least any one of the proportional controller and the integral controller including a correction unit that performs multiplication by a correction factor thereby to enhance an effect of a corresponding one of the proportional action and the integral action, the electric power steering apparatus further comprising an adjusting unit that performs an adjustment so that a denominator of a transfer function remains constant regardless of a value of the correction factor, when the target current set by the target current setting unit is an input, and the actual current actually supplied to the electric motor is an output.