Electronic parking brake system in vehicle and control method thereof

1. An electronic parking brake system, comprising:

a parking brake driving part applying or releasing a parking brake of a vehicle; and

a control part controlling the parking brake driving part;

wherein the control part ends an operation of releasing the parking brake based on a time interval of applying the parking brake, a time interval between an operation start point of releasing the parking brake and a time point when arrived on a predetermined current level, and a current applied to the parking brake.

2. The system of claim 1 , wherein the control part controls an apply movement distance of spindle of the parking brake and a release movement distance of spindle of the parking brake to the same.

3. The system of claim 2 , wherein the control part, controls a maximum distance in the applying operation of the spindle and the release movement distance of the spindle to the same when the parking brake is not applied within a normal range.

4. The system of claim 3 , wherein the control part, after controls the maximum distance in the applying operation of the spindle and the release movement distance of the spindle to the same when determines the parking brake is not applied within the normal range, adjusts the release movement distance of the spindle is longer than the maximum distance in the applying operation of the spindle of the parking brake.

5. The system of claim 1 , wherein the control part, determines a third movement distance of the spindle after the applied current arrived to the predetermined current level based on a first movement distance of the spindle when applies the brake, and a second movement distance of the spindle when releases the brake until the applied current arrived to the predetermined current level.

6. The system of claim 5 , wherein the movement distance of the spindle is calculated based on a current applied to a motor and a voltage applied to the motor.

7. The system of claim 6 , wherein the control part is configured to end the operation of releasing the parking brake after a movement time interval by calculated the movement time interval while the spindle moves the third movement distance.

8. A method of controlling an electronic parking brake, comprising:

calculating a time interval of an operation of applying the parking brake;

calculating a time interval between an operation start point of releasing the parking brake and a time point when arrived on a predetermined current level;

measuring a current being applied in the parking brake; and

ending an operation of releasing the parking brake based on the time interval of the operation of applying the parking brake, the time interval between the operation start point of releasing the parking brake and the time point when arrived on the predetermined current level, and the current applied to the parking brake.

9. The method of claim 8 , wherein the ending the operation of releasing the parking brake comprises controlling an apply movement distance of spindle of the parking brake and a release movement distance of spindle of the parking brake to the same.

10. The method of claim 9 , further comprising

calculating a first movement distance of the spindle when applies the brake;

calculating a second movement distance of the spindle when releases the brake until the applied current arrived to the predetermined current level; and

determining a third movement distance of the spindle after the applied current arrived to the predetermined current level based on the first movement distance of the spindle and the second movement distance of the spindle.

11. The method of claim 10 , comprising ending the operation of releasing the parking brake after a movement time interval by calculated the movement time interval while the spindle moves the determined third movement distance.

12. The method of claim 9 , comprising controlling a predetermined maximum distance in the applying operation of the spindle and the release movement distance of the spindle to the same when the parking brake is determined as not applied within a normal range.

13. The method of claim 12 , comprising, after the controlling the predetermined maximum distance in the applying operation of the spindle and the release movement distance of the spindle to the same when the parking brake is determined as not applied within the normal range, adjusting the release movement distance of the spindle is longer than the predetermined maximum distance in the applying operation of the spindle of the parking brake.