Research On Masking Fault Diagnosis For ATP On-board Equipment

ABSTRACT:Train control system is an important guarantee for the effective operation of the control train speed. ATP onboard equipment is an important indicator of the the train control system, and it is the control of driving speed and critical equipment to ensure traffic safety. Therefore It is necessary to the ATP onboard equipment to conduct to do fault diagnosis reasonably and effectively, especially its masking false failure sets.Masking false failure sets for ATP onboard equipment are quite common but not likely to be diagnosed with a fault. It’s basic feature is the positioning device to determine fault inaccurate. It appears to be the fault of a malfunction of the device A to device B.But the real fault that lead to joint malfunction is AB. This phenomenon gives troubleshooting to a certain degree of difficulty. This will also lead to increase equipment maintenance and to waste of time. Therefore, it is imperative to pick out the masking false failure sets on ATP board equipment.The paper aims to study methods of masking false failure sets on ATP onboard equipment. It examples to covers up failure analysis to the Beijing-Tianjin inter-city line CTCS-3D type ATP onboard equipment. The DMI display that" The host computer and CVC communication failure ". ATP onboard equipment failures made cover concept and characteristics, and its analysis of proposed principles and solutions. ATP onboard equipment and then create the overall design plan cover fault diagnosis model, through in-depth analysis of CTCS-200C device, functional and structural parameters of the device to identify each card, and use the form of a flow chart of the establishment of on-board equipment of each module logical connection between the cover so as to explain the whole process of fault diagnosis.Through the above data, obtained solving masking false failure sets related test matrix and particle swarm algorithm for solving a set of clusters cover conflict fault because the fault is on-board equipment, and ultimately to masking false failure sets. In addition, the method can also achieve complete data record JRU range, provide a reference for maintenance of on-board equipment to optimize pre devices such purposes.The process of solving the ATP onboard equipment malfunction is solved masking false failure sets test matrix device according to CTCS-200C minimal hitting set, minimal hitting sets to solve the most mature a way for Particle swarm optimization(PSO). Particle swarm optimization artificial intelligence algorithms, more advanced one of its advantages is fast convergence and adaptability, this algorithm is suitable for the purposes of data analysis to achieve fault diagnosis. In this paper, the method is applied to fault diagnosis ATP vehicle equipment by constructing an appropriate fitness function, changing the weights, you can fit the existing different types of faults, which can greatly improve the diagnostic efficiency and accuracy, train accident prevention dangerous.In this paper, the main work are:(1) Train control system for the fault features ATP-board equipment, the introduction of the concept of "masking false failure sets", and in-depth analysis of the characteristics of masking board equipment failure, and the need to cover the need for fault diagnosis.(2) The establishment of a masking false failure sets overall model. By CTCS-200C type of ATP onboard equipment structure and function analysis, clarify the logical links between each module and board, established to masking false failure sets flowchart, which is easy to masking false failure sets to solve the next step.(3) Solving masking false failure sets. According to the logical link between the on-board equipment modules. It establish cover troubleshooting test matrix. Particle swarm optimization algorithm has been established to cover up failure model to solve a set of clusters that seek to extract the minimal hitting set of mathematical models to achieve the purpose of fault diagnosis, provide resources and support for future failure prediction.(4) Establish masking false failure sets maintenance decisions. According to masking false failure sets diagnosis, a corresponding in-vehicle equipment failure, it can be judged to be the replacement and repair of the board and the types of equipment, so as to achieve the perfect troubleshooting purposes, to provide resources and support for future failure prediction.