Patent ID: 8485308

Claim:
An electric power steering apparatus including a motor, the apparatus comprising: a steering torque sensor configured to detect a steering torque applied to a steering wheel and output a steering torque signal corresponding to the steering torque; a speed sensor configured to detect a speed of a vehicle and output a speed signal corresponding to the speed of the vehicle; an auxiliary steering force setting unit configured to output a signal representing a linear change of a gradual increase or decrease; a map setter configured to receive a signal output from the auxiliary steering force setting unit and to set an auxiliary steering force map where a maximum steering torque, a maximum target motor current, or a ratio of a target motor current to a steering torque at a specific speed gradually increases or decreases; a current signal supply configured to output the steering torque signal and a target motor current signal corresponding to the speed signal according to the auxiliary steering force map; and a motor driving unit configured to supply a current corresponding to the target motor current signal to the motor.