Design and Verification of Safety Monitoring Device for Emergency Braking of Beijing Subway Capital Airport Line Vehicles
| Autor: | Gongde XU, Ao LIU, Meng GAI, Fayun MA, Feng MIAO, Lei CUI |
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| Jazyk: | čínština |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Chengshi guidao jiaotong yanjiu, Vol 27, Iss 1, Pp 174-178 (2024) |
| Druh dokumentu: | article |
| ISSN: | 1007-869X 1007-869x |
| DOI: | 10.16037/j.1007-869x.2024.01.031.html |
| Popis: | [Objective] To reduce friction brake wear and ensure emergency braking performance under electric braking, a safety monitoring device based on a two-stage emergency braking control is installed on Beijing Subway Airport Line vehicles to manage the emergency braking process. [Method] Starting from the control method, the device switching method for the two-stage emergency braking control mode is elucidated. The device is equipped with multiple speed acquisition channels to monitor multi-channel axle speeds in real-time, calculate the vehicle running speed, braking acceleration, and braking distance, establish the vehicle emergency braking control performance, and control the traction or braking system to apply emergency braking. During the vehicle emergency braking, the device prioritizes applying Level I emergency braking by controlling the vehicle traction and braking systems. When the performance of vehicle Level I emergency braking does not meet the requirements, the device switches to send emergency braking commands to the traction and braking systems, changing the method of applying emergency braking, and controlling the vehicle to apply Level II emergency braking. [Result & Conclusion] Field tests and on-board operations validate through inspection that the average criterion for device braking acceleration is approximately 1.26 m/s2 under the condition of 40 km/h train speed. The actual average braking acceleration is around 1.27 m/s2, indicating that the computation model conforms to the actual state of the vehicle emergency braking. The braking performance meets the braking acceleration requirements, effectively leveraging the vehicle electric braking capability while ensuring emergency braking performance. This approach reduces frictional wear of the vehicle braking system, lowers the risk of wheel slippage, and enhances vehicle availability. |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
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