Key Technology Research Of Multifunction Vehicle Bus

With the rapid development of China’s high-speed railway and urban rail transport, the train communication network, TCN, is applied widely and extensively. TCN functional structure is divided into the Wire Train Bus (i.e. WTB) and Multifunction Vehicle Bus (i.e. MVB). However, our TCN basic theoretical research and application development fall behind abroad relatively, which results in that the TCN core technologies are still foreign monopoly. Moreover, the MVB link control protocol and the functional bus management of MVB are important parts in the TCN core technology. Therefore, research on the key technologies dealing with MVB bus management functions will be much crucial towards developing MVB products which have independent intellectual property rights.On the basis of analysis upon the TCN international standard IEC61375-1, this thesis discussed in-depth on the MVB key technologies and its real-time protocol, explored and developed MVB controller based on FPGA (Field Programmable Gate Array) as well as MVB manager based on uCOS-II real-time multi-tasking operating system.The main research contents of the thesis are as follows:1. The analysis and overall design of the MVB. According to the analysis of the national train communication network standard IEC61375-1, comprehensive research is conducted on key technologies of MVB, while the research object is focused on functions of MVB management. Then this section discussed the overall design of MVB, and provided indicators analysis for completion of the MVB system design.2. The design of MVB controller. Based on functional and design requirements analysis through the MVB controller, the functions on data link layer of MVB controller are implemented by using field programmable gate array (FPGA); and the hardware circuit design of MVB communication board is fulfilled based on PC104bus standard.3. The design of MVB manager. According to real-time requirements of MVB bus management functions and process data transfer in IEC61375-1standard, the thesis has achieved the design including process data performance, device state management, message data properties and bus management performance by using embedded real-time multitasking operating system uCOS-II.4. Implementation and conformance testing of the MVB. Based on the completion of the MVB controller and MVB Manager, the MVB bus communication network is built, and the MVB bus testing is performed via network consistency testing according to IEC61375-2standard, including the MVB link control protocol testing and the behavior testing relying on communication capabilities of MVB manager function.In this thesis, FPGA and embedded real-time multitasking operating system uCOS-II are adopted to complete the design of MVB, while the system design specifications are accomplished. The conformance testing upon MVB has indicated that:the MVB link layer control protocol and the MVB manager functions have satisfied qualities both on data communication and mutual compatibility within devices, and meet the requirements of MVB aspects in IEC61375-1standard.