| The development and construction of modern intercity railway systems being one of the most important infrastructures have been playing a critical role in improving energy consumption, air pollution, logistics, human life, and promoting economy development. The Pearl River Delta (PRD) Intercity Railway, a typical intercity railway network under construction in China has proposed high demand for both Automatic Train Operation (ATO) and Automatic Train Protection (ATP) systems. They should pass the SIL4(Safety Integrity Level) and the S1L2safety certifications respectively.All the intercity railways systems built in China were equipped with CTCS-2/CTCS-3(China Train Control System) level train control systems, which do not have the functions of the ATO. It should be noted that the intercity railway systems in Europe, Japan and the United States are only furnished with national railway signaling systems, which do not have the functions of ATO. Consequently, the intercity railway train control system being developed in China, e.g., PRD control system, will be the most advanced and unique with innovative technologies in the world.Based on the dedicated study and analysis on rail-transportation-related products, technologies and standards in both domestic and international, this thesis focuses on the key technologies of both "safety" and "intelligent control" for the on-board train control systems, that include system architecture of vital computer platform, system diagnostics, safety interface and intelligent control of ATO. Moreover, the intercity railway onboard train control system has been developed and constructed through the simulation testing and validation with laboratory testing environment. The simulation tests have shown good results and the systems developed could be further tested and validated through real-road online operations. The major contributions of this thesis include the following aspects:(1) Based on the reliability fundamentals, solutions and the analytical studies on systems architectures of dual, triple and quadruple safety systems, a novel system architecture and platform for high availability quadruple vital computer (HAQVC) are proposed. Through system simulation and safety analysis, the reliability, availability, maintainability and safety of the HAQVC platform have been successfully developed with better performance than existing vital computer platform.(2) The core functions of the vital computers are mainly twofold:"Fault-Oriented Safety" and "System Fault Diagnosis", they involve very important safety related key technologies. The power supply and the master control unit are two core subsystems existing in vital computer platform. This thesis analyzes the failure mechanism and failure modeling of these two subsystems and has deeply studied the key technologies of diagnostic circuitry and diagnostic algorithm of the memory. The diagnostic technologies developed have been successfully applied in SIL4on board train control systems.(3) The safety interface unit of the onboard vital computer is the key functional unit for intercity railway on board train control system. Based on the analysis of the safety interface of the existing signaling system, this thesis has developed the key technologies with the novel safe digital inputs and outputs module to overcome the existing shortcomings and pitfall. The proposed novel solutions for online fault detection could achieve the cross back checks of the status feedback of the drive line side and the contact side. It also has the function of device status dynamic monitoring; consequently the risk of failure can be detected and reduced in time. By Fault Tree oriented safety analysis, the indicators of the safety interface fulfill the SIL4requirements.(4) Based on the operation requirement of the intercity railway and the technical characteristics of the CTCS2train control system, the functional characteristics and the overall structure of the intercity railway ATO system have been developed. On the other hand, based on the research of the traction and braking model of the intercity trains, both curve planning and optimization control algorithms for intercity railway ATO have also been studied to implement the match between ATO and ATP, as a result, the proposed solutions may significantly improve the performances of operation costs, energy consumption, safety, smart management as well as passengers comfort.Finally, the future directions and studies on ATO and intercity railway safety systems are included in the conclusions. |
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