Abstract:Electrohydraulic braking system is essential for the safety and reliability of the traffic safety, in order to improve its safety and reliability, a structure scheme of backup design of the electrohydraulic brake system was proposed. Its feasibility was verified by AMESim. The possible failure of the system failure of electronic control unit was analyzed based on ISO26262. The functional safety was designed for the subsystems ECU, motor, sensors of the control unit, allowing the entire systems to compliant with ASIL D evaluation. At last, the feasibility of the scheme and the validity of the functional safety design were demonstrated by experimental means. The results show that the design is in accordance with the requirements of the braking regulations, which proves that functional safety designs are effective.