Patent ID: 8337143

Claim:
An electronic actuator in a turbocharger of a vehicle comprising: an electronic control unit provided to the vehicle; a microcomputer for controlling operation of a vane of the turbocharger according to a PWM (Pulse Width Modulation) signal from the electronic control unit; and an actuator unit having a motor of which operation is controlled by the PWM signal from the microcomputer, wherein the microcomputer forwards PWM signals different from one another to the motor for controlling an overcurrent; wherein the electronic control unit performs a signal control step including a step of following up the present position of the vane and applying a current corresponding to a target signal to the motor, wherein the signal control includes a first control step including a step of applying an increased current to the motor during a t 1 time period by increasing a duty ratio of the PWM signal when the vane fails to position at the target position, wherein the signal control step includes an overcurrent control step for controlling an overcurrent to prevent the overcurrent from being applied to the motor, wherein the overcurrent control step includes: a second control step for decreasing a current being applied to the motor during a t 2 time period by decreasing the duty ratio of the PWM signal when the t 1 time period is passed, and a third control step for increasing the current being applied to the motor during a t 3 time period by increasing the duty ratio of the PWM signal when the t 2 time period is passed, wherein the t 1 time period is a predetermined time period required for the vane to follow up the target position, the t 2 time period is a predetermined time period required to cool down the motor.