Patent ID: 9347507
Filing Date: 2016-05-24
CPC Classification: F16D

Claim Text:
1. An electronic parking brake (EPB) system comprising an EPB actuator which has a motor and provides disc brakes provided in wheels with parking brake power by rotating the motor, the EPB system comprising: a parking switch turned on or off by a driver; a current detector configured to detect a motor current flowing through the motor of the EPB actuator; a motor driving unit configured to drive the motor of the EPB actuator; and an electronic control unit which applies a parking brake in which the motor of the EPB actuator is rotated by the motor driving unit in one direction to provide the disc brakes with the parking brake power when the parking switch is turned on, calculates an impedance of the motor when a motor current value detected by the current detector is higher than a preset value while applying the parking brake, and determines whether a motor stuck failure occurs based on the calculated impedance of the motor.