Research On Key Problems Of Reliability Of High Speed Train Control System

Train Control System completed according to the locomotive during the running time, weather, environment, lines, signal indicates other conditions and other conditions on the operating status of the locomotive supervision, start-stop control, speed adjustment and other operations, to improve rail transport efficiency, and ensure the safe operation of locomotives, rail transportation system to ensure safe and reliable operation of the train important technical equipment. Reliability is the main indicator train control system. Along with the computer, communications and control technology continues to develop and train control systems in a wide range of applications, availability, security, train control systems, reliability has greatly improved. With respect to the normal speed railway, the first high-speed railway has been running speed greatly improved, during the high-speed train running environment, signal processing and other aspects of change and more complex, and constantly improve the response speed of the high-speed train running status terms of supervision, speed control, operational safety and reliability of the train control system put forward higher requirements; secondly high-speed railway with respect to general speed railway, the higher the train control system hardware system integration, software complexity and more high, stronger coupling of hardware and software, the emergence of new problems and difficulties in the description and verification of train control system reliability; so the need for high-speed rail train control system reliability issues in-depth study.Based on a review of the high-speed rail train control system on the reliability of the system, around the high-speed rail train control system, the key research issues. The reliability of the key issues for the reliability modeling and verification decentralized station chain system, multi-sensor data fusion speed positioning system schedulability, computer security work status monitoring and fault diagnosis were studied and analyzed made the main findings are:1 According to the characteristics of distributed chain system is proposed to verify the reliability of the method and the basic process modeling and model based test and experimental analysis testing showed that the effectiveness of the proposed method;Decentralized field devices using interlocking system of independent decision-making, local self-discipline, operational mechanism work, can effectively overcome the shortcomings of centralized control has become an important application direction interlock system is an important research direction and high-speed train control system. Field interlock device with independent logic, enforcement of rules and strict reliability requirements and other timing synchronization. Problems interlock device for field implementation of the rules of logic and synergies, consistency, timing of, no deadlock is difficult to determine the reliability of property is proposed based on system modeling and model testing of distributed interlocking system reliability proven methods and basic processes. Given the widespread application of UML using UML state diagram for determining a logical interlock device modeling and implementation of the rules; for UML state diagram can not describe the time attribute of UML state diagram expanded to describe the time attribute; events running through the device interval timing diagram analysis of their synchronization; design a UML state diagram will be converted into regular time Petri nets and the development of automated conversion tools; By the time Petri net system activity, there is bound to verify the property, reversibility, etc., it analyzes the decentralized chain system has no deadlocks reliable properties. Studies have shown that the proposed method of reliability property distributed interlocking system can be accurately described and effective verification.2、Multi-tasking real-time scheduling system for time-triggered modeled proved for real-time periodic tasks, soft real-time period, the task is extended testing schedule; through field tests to verify the time-triggered multi-speed train positioning data fusion using system is scheduled; Train speed positioning system using a variety of guns pointing device has its own advantages and disadvantages for the environment. Multi-speed positioning device data fusion can reduce speed positioning error, help to achieve precise control of the train, the train can effectively improve operational safety and reliability. Multi-sensor data fusion speed positioning system scheduling scheduling problem belongs to multi-task real-time systems. Multi-sensor data fusion of time-triggered scheduling speed positioning system modeling and verification, real-time results of periodic tasks, soft real-time aperiodic tasks, overdue tasks detection task scheduling and other systems are available; The field test verification using multi-sensor data fusion time-triggered train speed positioning system is scheduled. Through field testing of the function of the system is verified, the test showed that the use of multiple data fusion reliability train speed positioning system is scheduled, and meet the train control system.3 HMM based on the establishment of a computer platform based vehicle security system features reasoning, the system state changes fault monitoring methods, given the state of the conversion mode and fault mode conversion, and after the test to detect the validity of the method.Car safety is an important part CBTC computer system, its operation status and fault reliability have a significant impact on the train control system. Car security of computer hardware and software systems are typically based COTS electronics, generation state of aging, the failure during operation and other issues is a gradual process, it is difficult to observe and detect before manifesting.HMM can effectively describe the electronic system status changes and fault occurrence, designed vehicle security computer simulation platform, according to the vehicle computer security mechanism extraction system during operation input micro cycle, application of micro cycle, long-characterization system operating characteristics of the output of the micro-cycle run; by observation data extraction and dimensionality reduction, normal state model training and improved fault state model train a series of measures to achieve the status of two modular redundancy monitoring computer security, on the normal state and the clock deviation of 1% to 10%, etc. 7 kinds of different conditions monitored. Tests showed the detection method can accurately indicate the system status and fault occurrence position, effectively manage the security of computer health status.