[关键词]
[摘要]
目前,基于通信的列车控制系统CBTC得到了广泛应用,并成为城市轨道交通信号系统的新标准。相对既往信号系统更具有列车追踪间隔时间短的显著优势,这与信号系统对轨道区段的划分方式密切相关。CBTC系统通过将物理区段细分为多个较短的逻辑区段,使得同一个大物理区段可以容纳多列车追踪运行,但同时也引入了新的问题,需处理两种区段状态;而区段占用状态有两个信息来源,在特定情况下会出现两者信息不一致的情况,造成信号故障关闭或进路不能正常解锁,影响运营效率。为了更可靠的获得区段占用状态,本文从计轴故障占用、列车定位误差、系统延时方面对两种区段状态信息不一致的原因进行研究,分析了具体场景中对区段状态的处理方法及存在的问题,并提出了在“区段融合”基础上增加“列车跨压信号机信息”或“即时占用,延时出清”判断策略,不仅确保了信号系统的安全性和可靠性,还提高了列车运行效率。
[Key word]
[Abstract]
CBTC, a communication-based train control system, is widely used in urban rail transit, and become a new standard of urban rail transit signal system. Compared with previous signal systems, CBTC has a significant advantage of shorter train tracking interval, which is closely related to the way in which the signal system divides the track block. Physical extents being subdivided into several shorter logical extents makes the same physical segments accommodate more trains in operation. However, this leads to a new problem, the need to deal with two kinds of Section Occupancy status s which are from two different information sources. And this two information may be inconsistent under certain circumstances, which makes signal fail to close or the route fail to be unlocked, affecting the operation efficiency. In order to get a more reliable Section Occupancy status , this paper discusses the cause of the two block states information inconsistence from the failure occupation of the axle counter, the train positioning error, and the system time delay, analyses the approach and problems when dealing with block states in a specific scenario, puts forward adding the train across signal information or using the judgment strategy of instant occupation and delay clearing on the basis of block fusion, which not only ensures the safety and reliability of the signal system, but also improves the efficiency of train operation.
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