Electronic parking brake system and control method thereof

A control method of an electronic parking brake system including an electronic parking brake actuator applied by a motor, the control method comprising:

• identifying a no-load condition;
• in the no-load condition, storing an inrush current generated during a parking apply operation of an electronic parking brake a preset number of times;
• storing the inrush current generated when the parking of the electronic parking brake is released the preset number of times;
• calculating an average value of the stored inrush current;
• calculating an inrush current model based on the average value of the inrush current;
• and
• identifying a clamping force of the electronic parking brake actuator based on the inrush current model and the inrush current.

A control method of an electronic parking brake system including an electronic parking brake actuator applied by a motor, the control method comprising:

• identifying a no-load condition;
• in the no-load condition, storing an inrush current generated during a parking apply operation of an electronic parking brake a preset number of times;
• storing the inrush current generated when the parking of the electronic parking brake is released the preset number of times;
• calculating an average value of the stored inrush current;
• calculating an inrush current model based on the average value of the inrush current;
• and
• identifying a clamping force of the electronic parking brake actuator during the parking apply operation of the electronic parking brake in the no-load condition based on the inrush current model and the inrush current.