轨道交通信号控制系统主备双系工作状态的识别与控制
韩安平1施莉娟2,3
Identification and Control of Rail Transit Signaling Control System Main and Standby Dualsystem Working Status
HAN AnpingSHI Lijuan
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作者信息:1.中国铁道科学研究院集团有限公司通信信号研究所， 100081， 北京
2.上海有轨电车工程技术研究中心，201804， 上海
3.上海市轨道交通结构耐久与系统安全重点实验室， 201804， 上海
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Affiliation:Signal & Communication Research Institute, China Academy of Railway Sciences Co., Ltd., 100081, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.07.033
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中图分类号/CLCN:U284.48
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栏目/Col:应用技术
摘要:
目的：针对轨道交通信号控制系统冗余结构中主备双系状态切换时可能存在的风险，提出一种新的硬件判决方式以避免该风险。方法：轨道交通信号控制系统多采用二乘二取二和双机热备冗余结构，由2个功能完成相同的主备双系组成。主备双系各自有主控、同步和离线等3种固定的工作状态，其不允许同时出现为主控状态。这3种工作状态的控制与转换依赖于自身和对方系的工作状态。目前，系统工作状态的判决机制主要有通信判决和硬件判决2种方式。若采用通信判决，一旦通信出现问题，则存在同时出现主备双系都为主控状态的风险。为此，提出采用设置工作继电器的硬件判决方法，即通过继电器硬件判决方式来识别和控制系统主备双系的工作状态，以避免同时出现主备双系处于主控状态的风险。主备双系各设置一个工作继电器，通过继电器的硬件接点条件来反映对应系的工作状态，并提出了设计原理、判决原则、判决实现流程及应用环境，分析了硬件判决方式比通信判决方式具有的技术优势。结果及结论：通过采集工作继电器位置反映对应铁路信号控制系统各系的工作状态，主要有以下优势：①不依赖于主备双系间通信的状态，解决了由于通信问题带来状态信息丢失的问题；②不论系统是否开机，系间是否通信正常，各系都能通过采集对方工作继电器接点条件来识别对方系的工作状态，从而能准确控制本系的工作状态；③继电器反应速度明显高于通信处理的反应速度，一旦系统工作状态发生变化， 工作继电器快速动作可使主备双系及时得到相应系的工作状态信息；④继电器具有固有失效安全特性，工作继电器一旦发生故障落下，使系统尽快转到离线状态；⑤通过继电器识别和控制系统工作状态，软件处理逻辑简单，也能使维护人员直观辨识系统工作状态。
Abstracts:
Objective: Targeting the possible risks in the main/standby dualsystem status switchover of rail transit signaling control system redundancy structure, a new hardware judgment method to avoid those risks is proposed. Method: Rail transit signaling control system often adopts double 2 out of 2 method and dualsystem hot standby redundancy structure. The system consists of main and standby two systems that perform the same function, each has three working status of host, synchronization or offline, and they are not allowed to be in host status at the same time. Control and switchover of the 3 working status depend on the working status of the system itself and the other one. At present, the judgment mechanism of system working status mainly includes communication judgment and hardware judgment. For communication decision, there is a risk of both systems in host control status simultaneously during communication faults. Thus the hardware judgment method with working relays is put forward, meaning that relays are used to identify and control the working status of the main and standby dualsystem to avoid the above risk. Main and standby systems set up a working relay respectively to reflect the working status of the corresponding system by relay hardware joint condition, for which the design theory, decision principle, decision implementation flow and application environment are proposed. The technical advantage of hardware judgment over communication judgment is analyzed. Result & Conclusion: By collecting working relay position, the working status of corresponding systems under the railway signaling control system is reflected. Main advantages are as follows: (1) independent of the communication status between main and standby systems, status information loss caused by communication problem is solved; (2) whether system is turned on or communication between systems is normal, both main and standby systems can identify the working status of the other one by collecting working relay joint condition, thus control working status of itself accurately; (3) relay response speed is evidently faster than communication process response speed, and once system working status switches, working relays of both main and standby systems can act instantaneously to inform the other one of their working status; (4) relay has intrinsic failsafety feature, meaning that if the working relay fails, system will be turned to offline status as soon as possible; (5) identifying and controlling system working status through relays, the software processing logic becomes simple and the maintenance personnel can identify system working status intuitively.
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