Abstract
The material difference of laser additive manufacturing brake discs and traditional brake discs result in inconsistent friction coefficients of contact surfaces of the brake discs and the brake shoes during the braking process. The sliding control strategy needs to be optimized to meet the requirements of new brake discs. The model of EP2002 brake system pneumatic valve unit (PVU) is built up in simulation software of AMESim. And the correctness of the model is verified through the simulation of service brake and emergency brake. The dynamics model of train is built in MATLAB/Simulink environment, and anti-slip control logic is compiled. Considering the friction characteristics of laser additive manufacturing brake discs, anti-slip control logic was developed. To verify the validity of anti-slip logic co-simulation is conducted between AMESim and MATLAB/Simulink. The simulation results of service brake and emergency brake show that the PVU model of EP2002 reacts consistently with real systems, which verifies the correctness of the model. The simulation results of anti-slip control show that a stable performance of anti-slip is achieved even continuous slip occurred, which means that the designed anti-slip control logic meets the control requirements. The research results provide an effective model for the actual design of the train braking system and solving of failures.
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