电子制动驻车系统是融合到host中的pbc函数，包括PBC初始化，PBC循环，PBC退出三部分，能够实现左后和右后电机的夹紧释放(The electronic braking parking system is a pbc function integrated into host, which includes three parts of PBC initialization, PBC cycle and exit, which can realize the clamping and re