Software Design And Realization Of Onboard Control System For Modern Trams

The rapid development of modern trams effectively alleviate the urban traffic congestion,but also promote the development of tram signal system.At present,most of the signaling systems used in the tram lines have been constructed by the traditional CBTC system.The system has a large amount of wayside devices,multiple system interfaces and obtains mobile authorization complex,so that the communication between the vehicle subsystem and the ground system is large and the communication delay is prolonged.The onboard operation control system is one of the core elements of the signal system and the key to ensure the traffic safety.Therefore,we design an onboard operation control system software based on train-train communication architecture,which including the function of train authorization calculation,interlocking and area control.It is of great significance to develop a new type of modern tram operation control system which can enhance the function of the vehicle,reduce the flexibility of the wayside equipment and control system.The system is mainly divided into three parts:data communication unit,logic control unit and human-computer interaction interface.The data communication unit is completed based on TCP/IP protocol,communication fault tolerance verification technology and UML data flow analysis method.The unit mainly includes the design of application system of data communication protocol and data communication service module based on UDP protocol design and implements the function of frame and deframe;Completes logic control unit design based on the modem tram signal system business process,the relationship between devices,moving block principle,and safe braking model,which realizes functions of the train operation project preparation,turnout control,crossing priority strategy,the control for trains's entering or leaving station,mobile authorization calculation,and train operation control logic.Collects speed and position of train in real-time by the method of shaft anemometry.Takes position registration by reading the electronic label and arranges train routes based on train operation project data;This paper,uses the technology and object oriented method modeling the wayside signal equipments,on-board computer,tram station,and train monitoring center,etc,completes HMI design.The unit determines the parameters of the train operation base by setting the parameters,completes train operation plan setting before departure through the operation of train registration,uploads train running state to the on-board computer and monitoring center in real-time and realizes speed curve,speed dial,communication window and electronic map displaying in real-time.The system realizes train operation parameter setting,trackside signal equipment manual control,train operation control mode selection and control,user management and data management functions and gets the object of arranging train operation project,automatic driving and moving block based on semi-physical simulation,which meets the modern tram operation control function demand.The on-board control system software is designed based on train-train communication system architecture in this paper.Compared with the traditional architecture,the movement authority computation and regional control and interlock function is integrated into the onboard system,which reduces ground equipments and improves the flexibility of the system controls.It embodies the train control thought of taking the train as the core,providing a reference for the development of modem tram onboard operation control system.