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US 8,337,143 B2Granted
Actuator in turbocharger of vehicle and method for controlling the same
AssigneeKamtec Inc.
InventorsChang Sik Lim, Seok Ryul Park, Sung Jong Yoon, Sung Dong Chang, Chae Hong Lim, Tae Wan Kim
Life of this patent
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Abstract
Actuator in a turbocharger of a vehicle and method for controlling the same is disclosed, in which a position of a vane is followed up in controlling a PWM signal to be applied to a motor according to time for preventing an overcurrent from flowing to the motor connected to the vane of the turbocharger.
Claims9
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 t1 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 t2 time period by decreasing the duty ratio of the PWM signal when the t1 time period is passed, and
- a third control step for increasing the current being applied to the motor during a t3 time period by increasing the duty ratio of the PWM signal when the t2 time period is passed,
- wherein the t1 time period is a predetermined time period required for the vane to follow up the target position, the t2 time period is a predetermined time period required to cool down the motor.
9 more elements
A method for controlling an electronic actuator in a turbocharger of a vehicle comprising the steps of:
- a target signal forwarding step for an electronic control unit to forward a PWM (Pulse Width Modulation) signal on a target position of a vane for making the vane of the actuator in the turbocharger to position to the target position;
- a vane position determining step for determining whether the vane is positioned at the target position or not at a present time;
- and
- a signal control step for determining that a present state is a normal state if the vane is positioned at the target position, and if the vane fails to position at the target position, controlling the PWM signal being forwarded to a motor according to time;
- wherein the actuator includes the motor that is connected to the vane,
- wherein the signal control step includes 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 step includes a first control step including a step of applying an increased current to the motor during a t1 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 t2 time period by decreasing the duty ratio of the PWM signal when the t1 time period is passed, and
- a third control step for increasing the current being applied to the motor during a t3 time period by increasing the duty ratio of the PWM signal when the t2 time period is passed,
- wherein the t1 time period is a predetermined time period required for the vane to follow up the target position, the t2 time period is a predetermined time period required to cool down the motor.
9 more elements
Dependencies are inferred from the claim text.