Research On Automatic Turn-Back Technical Scheme Of CTCS2+ATO System In Intercity/Suburban Railway

In recent years,the development of rail transit in China has made remarkable achievements.With the rapid development of economy and society and the improvement of technical level,rail transit is developing in a multi-standard and networked way.Intercity railway and suburban railway,as important transportation systems to serve the passenger transport demand between suburban agglomerations and between central suburban areas and surrounding suburban groups,play an important role in promoting regional coordinated development and urbanization in China.With the increasing passenger flow between cities,central city and surrounding towns,intercity/suburban railways have higher and higher requirements for line transportation efficiency,and the demand for public transportation operation has become more and more obvious.The turn-back time of the train at the turn-back station will directly affect the operation efficiency of the line,and the realization of automatic turn-back will effectively shorten the turn-back operation time of the train,which is of great significance to improve the transportation efficiency and capacity of the line.In order to solve the problem that the existing intercity/suburban railway using CTCS2 + ATO system can’t realize automatic turn-back,which leads to too long turn-back time to meet the needs of public transportation operation,this paper studies the technical scheme of realizing automatic turn-back function of CTCS2 + ATO system.The technical scheme of CTCS2 + ATO system which can realize automatic turn-back function is put forward,and the scheme is studied and explained in detail in the aspects of equipment modification,protocol design and process design.The main contents of this paper include:(1)On the basis of in-depth analysis of the requirements of existing specifications for automatic turn-back function,the requirements of automatic turn-back function of intercity/suburban railway and the turn-back ability under existing CTCS system,the technical scheme of realizing automatic turn-back function of intercity/suburban railway CTCS2 + ATO system is put forward.The system structure is deeply analyzed,and the functions of each equipment in the system to be optimized and the corresponding modification scheme are clearly defined.(2)Based on the technical scheme of automatic turn-back,the interface of adding automatic turn-back function between devices is designed in detail,and the workflow and information interaction of ground equipment,on-board equipment,vehicle and driver in each stage of the post-station automatic turn-back and in-situ automatic turnback process are designed in detail.Based on Fault Tree Analysis(FTA),seven possible fault scenarios in the automatic turn-back process are analyzed in detail,and the corresponding on-board equipment processing logic and driver operation flow when each fault occurs are deeply discussed.(3)Select CRH6 vehicle parameters and typical station line parameters to carry out laboratory test and interoperation test of automatic turn-back technology,select a bus factory test line to carry out field test verification,and count the time required for each stage of in-situ/post-station turn-back.In addition,combined with the calculation results of theoretical time-consuming in each stage of turn-back process,the return capacity of turn-back station is calculated and analyzed respectively.Through the laboratory,interoperation and field test verification,it shows that the automatic turn-back scheme described in this paper can make the train realize automatic turn-back function,which is feasible and meets the requirements of interoperation between equipment.According to the statistical results of turn-back time,the turn-back line of trains can be completed within 180 s,and the turn-back capacity reaches 22trains/h,which indicates that the automatic turn-back function can significantly improve the turn-back capacity of train turn-back stations.Compared with manual turn-back,it can greatly shorten the turn-back time and improve the turn-back efficiency,which is of great significance for CTCS2+ATO system of intercity/suburban railway to meet the needs of public transportation operation.Figure 48,Table 37,Reference 52.