Electronic parking brake system in vehicle and control method thereof

Patent metadata

Field	Value
Publication number	US-2016304069-A1
Application number	US-201615130495-A
Country	US
Kind code	A1
Filing date	Apr 15, 2016
Priority date	Apr 15, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

Disclosed herein are an electronic parking brake system and a method of controlling the same. The electronic parking brake system includes a wheel speed sensor which senses a movement of a vehicle; a vertical acceleration sensor which measures a vertical acceleration value; an electronic control unit (ECU) which determines whether the vehicle is rolling based on the movement of the vehicle and the vertical acceleration value; and a parking brake which brakes the vehicle based on the determination of whether the vehicle is rolling by the ECU.

First claim

What is claimed is:

1 . An electronic parking brake (EPB) system comprising:
a wheel speed sensor which senses a movement of a vehicle; a vertical acceleration sensor which measures a vertical acceleration value; an electronic control unit (ECU) which determines whether the vehicle is rolling based on the movement of the vehicle and the vertical acceleration value; and a parking brake which brakes the vehicle based on the determination of whether the vehicle is rolling by the ECU.

2 . The EPB system in claim 1 , wherein the ECU includes:
a comparator which determines whether an absolute value of the vertical acceleration value is greater than a predetermined reference value; a counting portion which counts a number of times when the absolute value of the vertical acceleration value is greater than the reference value; and a re-clamp restrictor which fastens the parking brake when the number is equal to or less than a predetermined reference counting number, and restricts fastening the parking brake when the number is greater than the predetermined reference counting number.

3 . The EPB system in claim 2 , wherein the ECU further includes:
a rolling determination portion which determines that the vehicle is rolling when the number is equal to or less than the predetermined reference counting number; and a shaking determination portion which determines that the vehicle is shaking when the number is greater than the predetermined reference counting number.

4 . The EPB system in claim 3 , wherein when the shaking is determined, the ECU disables a rolling detection of the vehicle by the wheel speed sensor of the vehicle.

5 . An EPB system comprising :
a vertical acceleration sensor which measures a vertical acceleration value; an ECU which determines whether a vehicle is shaking based on the vertical acceleration value; and a parking brake which brakes the vehicle based on the determination of whether the vehicle is shaking by the ECU.

6 . The EPB system of claim 5 , wherein the ECU includes:
a comparator which determines whether an absolute value of the vertical acceleration value is greater than a predetermined reference value; a counting portion which counts a number of times when the absolute value of the vertical acceleration value is greater than the reference value; and a re-clamp restrictor which fastens the parking brake when the number is equal to or less than a predetermined reference counting number, and restricts fastening the parking brake when the number is greater than the predetermined reference counting number.

7 . The EPB system of claim 6 , wherein the ECU further includes:
a rolling determination portion which determines that the vehicle is rolling when the number is equal to or less than the predetermined reference counting number; and a shaking determination portion which determines that the vehicle is shaking when the number is greater than the predetermined reference counting number.

8 . The EPB system of claim 7 , wherein the counting is performed when the vehicle is stopped.

9 . A control method of an EPB system comprising:
sensing a movement of a vehicle by a wheel speed sensor of the vehicle; measuring a vertical acceleration value by a vertical acceleration sensor of the vehicle; determining whether the vehicle is rolling based on the vertical acceleration value and the movement of the vehicle; and re-clamping a parking brake of the vehicle based on the determining of whether the vehicle is rolling.

10 . The control method of claim 9 , wherein the determining of whether the vehicle is rolling includes:
counting a number of times when an absolute value of the vertical acceleration value is greater than a reference value; determining that the vehicle is shaking when the number is greater than a reference counting number; and determining that the vehicle is rolling when the number is equal to or less than the reference counting number.

11 . The control method of claim 10 , further comprising restricting the re-clamping of the parking brake when the vehicle is determined to be shaking.

12 . The control method of claim 11 , further comprising disabling a rolling detection of the vehicle by the wheel speed sensor of the vehicle when the vehicle is determined to be shaking.

Assignees

• Mando Corp

Inventors

• Choi Ho-Jin

Classifications

• B60T8/171

  Detecting parameters used in the regulation; Measuring values used in the regulation · CPC title

• B60T8/3205 Primary

  acceleration (B60T8/34, B60T8/52, B60T8/54, B60T8/56, B60T8/58, B60T8/72, B60T8/86, B60T8/88 take precedence) · CPC title

• B60T7/122 Primary

  for locking of reverse movement · CPC title

• B60W2710/186

  Status of parking brakes · CPC title

• B60W40/107

  Longitudinal acceleration · CPC title