The Study Of Redundant ATO Algorithms And Its Implementation

With the high-speed development of economy and society in China, urban rail transit, as the supporting foundation of urban transportation system, is also developing faster and faster. Automatic level and reliability in signaling system of urban rail transit need to be upgraded constantly. Fully Automatic Operation Train Control System (FAO), as the new development direction of signaling system in the world, has a very high level of automation and high reliability. Therefore, the most important subsystem in FAO, ATO, needs to be improved for high reliability.Nowadays, the ATO subsystem in CBTC contains only one host control board.To meet with high requirement of reliability in FAO, it is necessary to re-design the ATO subsystem. This problem can be solved from two aspects. From one aspect, the reliability of single host control board can be improved, by making use of high reliable hardware, and enhancing the robustness of ATO control algorithm. From the other, when the single host control board got failure, the other host board can be switched on to substitute the failed one. So, a new scheme is designed, which has two hot standby redundant ATO, to solve the problem effectively.The redundant ATO subsystem in FAO is as the research object in this paper. The research work is as follows:(1) The background and significance of the study are introduced. The research and development process of ATO equipment is summed up, to point out the necessity of researching on redundant ATO.(2) The architecture of redundant ATO is designed, and the hardware reliability of all boards in the subsystem is verified. The DFMEA analysis method is utilized, which is widely used in industry, verifying the hardware reliability and concluding that both of the single host board and the whole ATO subsystem have reached much higher level of reliability than the old single board ATO architecture.(3) A detailed description of the research on the algorithms in redundant ATO and the implementation process is given. As the core research content, the description is divided into three parts from bottom to up. First is the research and implementation of hardware driver algorithm, in which the driver developing methods of RM48L952safety MCU, and driver functions are described. Second is the research and implementation of application algorithm, in which the data communication mechanism between the boards in redundant ATO, and the mechanism of host board failure monitoring and switching are designed. The porting process of applications and new application development are described. Third is the research and implementation of control algorithm, in which generalized predictive control algorithm is introduced and improved to satisfy the needs in ATO control, and three engineering implementation methods are given.(4) After the research and development of algorithms in redundant ATO, the final welding, assembly and debugging of all boards in redundant ATO are completed. The functions of redundant ATO are tested and verified in laboratory simulation platform, showing that the redundant ATO designed in this paper can control train normally, monitor the host board failure and switch to the standby host board when the host board failure occurs.Above all, this paper completes the research and implementation of the hardware and software of the redundant ATO, gives the design scheme and the final design results, verifies the validity of the design, and shows some sorts of engineering reference significance.