The caliper integrated electronic parking brake system EPB(Electrical Park Brake) uses electronic control to replace the traditional handbrake parking brake system. The parking brake function will be manually activated and deactivated by the driver by manipulating the parking control switch. The most basic function of the EPB system is to allow a fully loaded vehicle to park safely on a ramp (parking brake function). It can also provide an auxiliary release function when the vehicle starts on a large ramp to ensure that the driver can use the vehicle normally on the ramp. EPB systems are also required to provide a "dynamic braking function" to achieve dynamic deceleration of the vehicle. In order to meet regulatory requirements and functional expectations, the EPB system must also be able to implement many special functions. In order to realize the requirements for necessary functions, the EPB system collects information data from the CAN network on the vehicle and other system signals in the form of physical electrical connections, and processes them to determine the current driver's needs for the EPB system and perform corresponding actions. When necessary, the EPB system will also send information through the vehicle CAN network to request other functional modules of the vehicle such as SCS, BCM, etc. to complete relevant auxiliary actions.
The EPB system contains an ECU, an electrical switch and two actuators integrated on the rear caliper to implement it. The actuator is included in the rear brake caliper assembly to avoid the installation of additional brake cables and allow the actuator to apply braking force directly to the rear wheels. The EPB control switch is arranged in a position easily accessible to the driver. The driver can complete the parking action of the vehicle by simply operating the EPB control switch. Smart Holding is realized using electronic control methods, replacing the traditional mechanical handbrake system. The first system has been successfully applied to the new Roewe 550. It is the first time in China that a mid-size sedan has been successfully equipped with a caliper integrated electronic parking system. It has also become one of the five major technological highlights of the new Roewe 550.

1. The electronic informatization and intelligent control of the parking brake system are realized;
2. For the first time, a highly integrated caliper integrated electronic parking system has been adopted in domestic independent brand enterprises;
3. For the first time, the logic combining throttle opening and ramp calculation is used to judge the automatic release point of the vehicle, so that the vehicle's auxiliary starting performance under any ramp can be optimized;
4. Multiple safety redundancy designs provide comprehensive safety monitoring of the parking system to ensure that the parking system reaches ASIL B-level safety design. Some special functions related to safety require ASIL D-level safety levels.
   Through the application development of the caliper integrated electronic parking system, we have deeply grasped the functional logic, network and physical input and output, and human-machine interface requirements of the EPB system, improved product design quality, reduced project development costs, and enhanced Shanghai Automobile Group Co., Ltd. The independent innovation and independent development capabilities of the chassis safety system of the Technology Center of Co., Ltd. have also cultivated and trained a highly skilled development team. It has laid a solid foundation for the future development and promotion of independent brand chassis electronic parking brake systems. At the same time, through the cooperative development of complete machine factories and component manufacturers, it has greatly promoted the independent research and development level of China's automobile industry and provided basic guarantee for the improvement of the level of my country's automobile industry. Through project development,
5. Establish a complete and complete process for the development and verification of caliper integrated electronic parking systems;
6. The design input and output interfaces of the electronic parking system are established;
7. A complete system logic failure verification mechanism and verification method have been established;
8. The performance goals and test verification methods of the electronic parking system are established.