Design, modeling, and simulation of dual-source redundant braking system

Based on the existing theory of EHB braking system, a new dual-source redundant braking system (DSRB) is proposed in this paper. The proposed DSRB is improved on the classic ESP system structure with two sets of motor hydraulic pumps, four throttle valves and two balance valves used to replace the failed oil inlet and outlet valves added in it. Then, the requirements of redundancy, reliability of intelligent vehicle braking system can be met by the system. The wheel cylinder pressure of DSRB system is accurately regulated by PID control algorithm. Finally, the co-simulation based on AMEsim/Simulink were implemented to verify the accuracy and reliability of the braking efficiency of the DSRB. Results show that the designed DSRB has fault tolerance even in the case of partial failure, that is, inlet and outlet valve failure and complete failure, that is, inlet and outlet valve and hydraulic motor failure at the same time. And good braking efficiency, boosting speed and pressure regulation accuracy are still available.