Research On The Train Route Parallel Monitoring Method

With the rapid development of high-speed railway and the increasing continuously of the train speed,the requirements of the reliability and safety for train control system are becoming increasingly high.However,there are still many accidents at home and abroad in recent years.According to the statistics,setting the wrong train routes is one of the main causes of accidents.In the process of setting the train routes,the cases of setting wrong routes occurred frequently because of illegal operation,equipment failure and other factors.It might cause dangerous accidents such as breaking switches,derailment and train depart to the wrong direction at least,or cause serious accidents such as train collision,rear-ended which lead to property damage and personal injury or death.Therefore,another monitoring channel is established by studying principle and analyzing the problems of the existing train route control in this paper.This new control channel and existing channel constitute the parallel monitoring for improving the reliability,correctness and safety of the train route setting process and avoiding the situation of setting wrong train route.The main contents of this paper are as follows:1.The concept and application conditions of parallel monitoring are proposed and the mechanism of parallel monitoring is studyed,which make up the deficiency of the existing self-discipline control system.The parallel monitoring system can supervise and fault early warn the output of the existing self-discipline control system.When the outputs of the train route self-discipline control system become abnormal,parallel monitoring system can immediately alarm and take the "fail-safe" measures,which can significantly improve the safety and reliability of the train route setting process.2.The problems of existing train route control process are analyzed and the large interlocking at the system level which involves four aspects:traffic plan,operator operation,interlocking execution and the occupancy and release of the train route are proposed.The whole process of train route setting process is analyzed in this paper.3.Based on the mechanism of parallel monitoring and the concept of large interlocking,a train route parallel monitoring method based on virtual image technology is proposed.By adding the corresponding hardware and software modules to the CTC,the station and the train,the structure and monitoring process models of train parallel monitoring system is established.The models include data collection,traffic plan,operator operation,interlocking execution,occupancy and release of the train route,comparison result,maintenance behavior and database updating and upgrading.The key technology of train parallel monitoring:synchronization and comparison strategy for ensure the correctness of the output of train route parallel monitoring system is proposed in this paper.4.The reliability of the train route parallel monitoring system is analyzed.The method for analyzing reliability by combining stochastic Petri net and Markov chain is introduced.Based on the example of the operator operation monitoring module established in Chapter 4,the improvement of the reliability of the train route setting process after adopts parallel monitoring is verified by simulation,conversion,substitution of the actual statistical data,calculation,comparison and analysis.Therefore,train route parallel monitoring system designed in this paper is correct and rational.