Electronic parking brake system and control method thereof
An electronic parking brake system including: an electronic parking brake including a pair of brake pads disposed on both sides of a brake disc rotating with a rear wheel of a vehicle, a piston provided to press the pair of brake pads, a nut member provided to press the piston, a spindle member provided to move the nut member, and a motor configured to rotate the spindle member; and a controller electrically connected to the motor and configured to perform a parking operation for the EPB, wherein the controller is configured to detect an inrush current flowing through the motor during the parking operation, and identify a low voltage fault based on the detected inrush current.
1. An electronic parking brake system, comprising:
an electronic parking brake (EPB) comprising a pair of brake pads disposed on both sides of a brake disc rotating with a rear wheel of a vehicle, a piston provided to press the pair of brake pads, a nut member provided to press the piston, a spindle member provided to move the nut member, and a motor configured to rotate the spindle member; and
a controller electrically connected to the motor and configured to perform a parking operation for the EPB,
wherein the controller is configured to detect an inrush current flowing through the motor during the parking operation, and identify a low voltage fault based on the detected inrush current.
2. The electronic parking brake system of claim 1 , wherein the controller is configured to identify the low voltage fault based on the detected inrush current and a driving voltage of the controller.
3. The electronic parking brake system of claim 2 , wherein the controller is configured to identify as the low voltage fault if the driving voltage of the controller is higher than a preset voltage and the detected inrush current is lower than a minimum inrush current.
4. The electronic parking brake system of claim 3 , wherein the controller is configured to identify the minimum inrush current according to the driving voltage of the controller.
5. The electronic parking brake system of claim 4 , wherein the controller is configured to identify the minimum inrush current depending on the driving voltage of the controller, based on driving voltage-minimum inrush current mapping data stored in a memory.
6. A control method of an electronic parking brake system comprising an EPB comprising a pair of brake pads disposed on both sides of a brake disc rotating with a rear wheel of a vehicle, a piston provided to press the pair of brake pads, a nut member provided to press the piston, a spindle member provided to move the nut member, and a motor configured to rotate the spindle member; and a controller electrically connected to the motor and configured to perform a parking operation for the EPB, the control method comprising:
detecting an inrush current flowing through the motor during the parking operation; and
identifying a low voltage fault based on the detected inrush current.
7. The control method of claim 6 , wherein the identifying of the low voltage fault comprises identifying the low voltage fault based on the detected inrush current and a driving voltage of the controller.
8. The control method of claim 7 , wherein the identifying of the low voltage fault comprises identifying as the low voltage fault if the driving voltage of the controller is higher than a preset voltage and the detected inrush current is lower than a minimum inrush current.
9. The control method of claim 8 , wherein the identifying of the low voltage fault comprises identifying the minimum inrush current according to the driving voltage of the controller.
10. The control method of claim 9 , wherein the identifying of the low voltage fault comprises identifying the minimum inrush current depending on the driving voltage of the controller, based on driving voltage-minimum inrush current mapping data stored in a memory.