A fault warning method of an electric parking brake is provided.  The fault warning method includes, a brake is actuated with a motor.  An armature current is transmitted from the motor.  The armature current is converted to a low frequency current and a high frequency current.  A braking force is estimated by the by the low frequency current, and a motor rotating speed is estimated by the high frequency current.  The braking force is compared with a predetermined braking force range, and a braking force comparing signal is outputted.  The motor rotating speed is compared with a predetermined rotating speed range, and a rotating speed comparing signal is outputted.  A determining result is generated by determining the braking force comparing signal and the rotating speed comparing signal. And a warning signal is generated according to the determining result.

Applied Country	Category	專利狀態	證書號	專利權期間	研究成果公告日期
CN	Chassis steering technology	獲證	CN105667489B	2018/04/17~2034/11/20