Optimization of ATO Re-benchmarking Method Based on Light Braking Command

Abstract

Objective When the initial parking of an FAO (fully automatic operation) train in station exceeds the permitted range for door opening, the ATO (automatic train operation) system needs to re-benchmark accurately. The conventional ATO re-benchmarking method using only traction and braking commands is time-consuming, and the distance of train single movement does not meet performance requirements, affecting operational service. Therefore, it is necessary to optimize the ATO re-benchmarking method based on light braking commands. Method By considering the delays in the traction and air brake systems during actual train operation, the reason for train single move distance exceeding 1 m in case of the above-mentioned ATO method using only traction and braking commands is analyzed, and the ATO re-benchmarking method is optimized based on light braking commands. The optimized one applies fixed-level braking in advance, eliminates delays caused by air brake system during the parking process， making the process of a single movement involve only the traction system delay, thereby shortening the single move distance and meeting the performance requirements of the ATO re-benchmarking function. The feasibility of the optimized ATO re-benchmarking method based on light braking commands is validated through theoretical calculations of a single move distance. Result & Conclusion At present, the door opening authorization accuracy range is ±0.5 m, and the re-benchmarking function must achieve a train single move distance of less than 1.0 m to meet the stopping accuracy correction requirements. In the conventional ATO re-benchmarking method, the longer response time and execution time of the air brake system result in single move distances exceeding 1.0 m, failing to meet the stopping accuracy correction requirements. Theoretical calculations indicate that the optimized ATO re-benchmarking method based on light braking commands can meet the requirements for a train single move distance within 1.0 m.

Keywords

• urban rail transit
• fao
• ato re-benchmarking
• air brake
• minimum move distance
• light braking