Chengshi guidao jiaotong yanjiu (Jan 2024)
Metro Train Braking Simulation Control System Based on EP2002 Braking System
Abstract
[Objective] To address the issue of the highly integrated internal structure of the EP2002 valve system, which hinders internal fault injection, a metro train braking simulation control system that accurately reflects the functioning mechanism of the EP2002 braking system is designed. The system is intended for fault simulation and personnel training in metro train braking systems. [Method] The air circuit structure and operating mechanism of the EP2002 valve system are introduced, and the overall scheme of the metro train braking simulation control system based on EP2002 is elaborated separately for the electrical and pneumatic components. Using AMESim simulation software, common and emergency braking experiments are conducted to simulate the air circuit of the EP2002 braking system and the metro train braking simulation control system respectively, and the consistency of their braking characteristics is verified. [Result & Conclusion] The overall scheme of the metro train braking simulation control system based on EP2002 utilizes basic air circuit components to construct an equivalent unit circuit with properties identical to the EP2002 valve. For the more complex parts of the air circuit, a mathematical model based on chamber air filling and venting is employed using time-stepping simulation in the software for equivalence. The control unit based on the STM32F107 microcontroller is used for monitoring and controlling the pneumatic section, as well as managing communication between various equivalent EP2002 valve units. The metro train braking simulation control system adopts networking structure similar to EP2002 braking system, with multiple equivalent EP2002 valve units interconnected through a CAN bus and vehicle bus to establish a braking simulation control system based on the EP2002 braking system, achieving cost-effective simulation of the entire train braking system. AMESim model simulation results indicate that the metro train braking simulation control system can maintain brake cylinder pressure at the target value with faster response speed and higher control precision, exhibiting external braking characteristics completely consistent with the EP2002 braking system.
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