This project is a product of the open architecture electronic parking brake system (hereinafter referred to as EPB) developed by our company. When the hydraulic brake system and electronic body stabilization system (hereinafter referred to as ESC) fail, the driver can activate the EPB ldquo; dynamic emergency braking functionrdquo; to ensure safe and stable braking of the vehicle. In the future, with the continuous popularization of intelligent driving technology, it will provide a possible intelligent braking backup for the brake-by-wire system. From the principle of service braking, it is known that only when the deceleration reaches a certain range by controlling the wheel slip ratio can the vehicle be able to decelerate stably and safely. Controlling slip ratio requires EPB software to adjust the output clamping force of EPB calipers in real time to control wheel speed. If the wheel slip ratio is too small, the deceleration of the vehicle will not be able to meet the deceleration requirements of emergency braking, and it is necessary to increase the clamping force; if the slip ratio is too large, the wheel will easily tend to lock or even lose control, and it is necessary to release the brake caliper. How to accurately control the clamping/release of the motor to ensure that the slip rate is stable within a certain range is the key to maintaining vehicle safety, stability and deceleration braking. The ldquo; dynamic emergency braking rdquo; function developed by our company adopts the ldquo; three-point control dynamic emergency braking algorithm rdquo; based on wheel slip ratio. The algorithm adjusts the clamping force output by the electronic parking brake based on wheel slip ratio to ensure that the vehicle slip ratio is within the appropriate range under various road conditions. It is domestically leading and internationally advanced. I. Control strategy algorithm innovation a. Three-point control dynamic emergency braking algorithm based on dynamic slip ratio: Make the EPB emergency braking deceleration of the vehicle on the high-attached road surface approach-3.0m/s2, which is much higher than the regulatory requirement-1.5m/s2.  b. High-precision clamping force calculation method based on temperature compensation: Our software compensates according to current values under different temperatures and voltages to obtain accurate real-time clamping force. Ensure that there is little difference between the calculated clamping force and the actual output clamping force under all working conditions, and improve the calculation accuracy of static clamping force. II. The structural innovation adopts the quick return angle design of the inner friction plate, which is increased from 2 degrees to 4 degrees, so that the inner friction plate can return smoothly and quickly during the release process, ensuring that it is not easy to cause dangerous situations such as vehicle instability during emergency braking. situation. The design has been patented and authorized, and the patent number is ZL201721038954.7. III. The experimental method innovates the independently developed dynamic clamping force measurement method to achieve accurate measurement of clamping force at full working temperatures without installing a force sensor. This method has applied for an invention patent, with the patent number 201810720063.2. IV. The V model based on the ISO-26262 functional safety system standard and the A-SPICE standard ldquo; Dynamic Emergency Brakerdquo; function development process strictly follows the ISO-26262 safety system and A-SPICE standard. Corresponding EPB software development obtained A-SPICE Level 3 certification for the first time in the domestic EPB software development field, and received the 2017 Quality Excellence Award awarded by the German headquarters-EPB development obtained the ASPICE Level-3 review. This function can ensure safe braking in emergency situations during driving on the premise of meeting regulatory requirements. At present, it has cooperated with customers such as SAIC Passenger Vehicles, Great Wall, Chang 'an, SAIC-GM-Wuling, GAC Honda, Baowo Automobile, Zotye, GAC Passenger Vehicles and other customers. Among them, SAIC Passenger Car A Architecture has been approved for production, and the A+ / E Architecture platform is under development. Great Wall GWM CHB041 (H7), CHII Platform (WEY), etc. have all been approved.