| According to the “13th Five-Year Plan” for rail transit planning,it is proposed to build3,000 kilometers of rail transit and put into operation,indicating the importance of urban rail construction.In 2016,the National Development and Reform Commission approved the construction of rail transit in 42 cities.Many provinces and cities are vigorously promoting the development of their subways and light rails.This also shows the urban rail transit in China during the “13th Five-Year Plan”period.Construction will usher in a period of booming development.However,the rapid increase of subway lines in major cities has also brought greater pressure on its operations.The rapid development of science and technology has also complicated the interference environment.In recent years,trains have been delayed due to interference problems,and the public is safe to operate the subway.More attention.How to quickly eliminate interference sources,ensure train safety,and improve transportation efficiency will also bring challenges to metro operations in cities.In 2016,Shenzhen opened the first city express rail line 11,as the maximum speed of the airport express line can reach 120 km / h,which greatly facilitates the needs of citizens.Line11 adopts CBTC(train control based on wireless communication)system,and the positive signal system adopts complete mobile occlusion ATC system,which is mainly composed of automatic train monitoring(ATS),automatic train protection(ATP),automatic train driving(ATO).The computer interlocking(CBI)subsystem is composed of subsystems based on the advanced communication information exchange network to form a closed-loop system,which can fully utilize the signal system to ensure driving safety,shorten the driving interval and improve the operating efficiency.However,redundant security guarantee And the function also makes the CBTC system subsystem type and trackside equipment more,the function crossover between each subsystem is complicated,the single equipment failure will affect the operation of the whole line,and the wireless communication of the signal system adopts the common frequency band 2.4GHZ,common The use of frequency bands also brings a lot of interference problems.This paper is based on the fault investigation and test of the trainemergency braking late event caused by the redundant function and interference problem of Shenzhen Metro Line 11,and investigates the interference source research,proposes the rectification plan to optimize,and proposes the technical transformation of the future subway vehicle wireless communication system.Improve system anti-interference ability,improve equipment reliability and subway operation efficiency.In this paper,the 11 th line is caused by signal interference,and the train tightening late event is introduced.In the process of fault investigation,the project overview,line and environment of Line 11 are first described,focusing on train control mode,signal contractor,transmission mode,and downgrade.The system scheme is analyzed.The overall design and functions of the subway signal system include the ATS,ATP,ATO,CBI,and DCS subsystems in the ATC.After the overall analysis of the line,the data of the interference event fault is counted and combined with the data.And the actual analysis of the line,the development of testing methods and solutions,according to the implementation of the program improvement,complete optimization and propose transformation plans to establish a long-term effective anti-interference system.By introducing the overall structure and specific functions of the signal system,it is helpful to find the root cause of the interference problem and the direction of improvement.The research on interference problems not only improves the reliability of the system,improves the operational efficiency,but also contributes to the technological development of high-density subways in the future. |
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