【作者】 蔡颖；

【导师】 诸昌钤；

【作者基本信息】 西南交通大学 ， 计算机应用技术， 2005， 硕士

【摘要】 随着微机控制和现场总线技术的发展,现代列车的过程控制已从集中型的直接数字控制系统发展成为基于网络的分布式控制系统。国际电工技术委员会IEC为实现车载数据通信系统的标准化于1999年通过了一项列车通信网络标准即TCN(IEC61375-1)。该标准将列车通信网络分成连接各节可动态编组车厢的绞线式列车总线WTB和连接车厢内固定设备的多功能车厢总线MVB。MVB为快速响应的过程控制总线,对于固定编组的列车,也可以用作列车总线。 西方发达国家的列车通信网的研究与应用已较为普及,而国内只有少数院校和科研院所有相关研究。目前MVB的产品和技术被国外的几个公司垄断,而我国对引进技术的理解消化和二次开发都做的不够。这严重阻碍了MVB在国内机车上的推广使用,同时也不利于研制具有自主知识产权的列车通信网络产品和日后制订中国自己的列车通信网络标准。正是基于这种原因,本文对TCN中的MVB技术进行了仔细研究,分析比较了MVB同其它的几种通用现场总线的优缺点和应用特点。并在深入了解MVB的通信机制的基础上,设计了一款MVB核心专用芯片多功能车厢总线控制器(MVBC)。设计采用自上而下的EDA设计方法和功能相关的模块分组验证方法,电路设计采用Verilog代码描述,仿真工具采用Synopsys公司的VCS,综合与FPGA验证采用Xilinx的集成开发环境ISE。目前各个模块的代码设计已完毕,并通过了软件仿真,正在进行FPGA板级验证准备工作。由于MVBC系统复杂,对可靠性、安全性、实时性、稳定性以及寿命的要求高,同时还需要面临电磁干扰、大跨度的温差、强机械震动等恶劣环境,要走入实用至少需要几年的时间进行各种硬件功能测试和现场稳定性测试。 本文研究的意义在于:1)项目全部完成后可实现用FPGA替代现有的MVBC专用芯片或制造自己的专用MVBC芯片,那时我国就不会受制于国外对MVBC芯片和技术的垄断,这将大大推动国内MVB的发展与应用;2)该研究有利于更深入的了解MVB技术精髓,为国内制订自己的列车通信网络标准打下了一定的基础。更多还原

【Abstract】 With the development of the technology of embedded micro controller and field bus, the process control of modem train has developed from concentrated direct digital control system to distributed control system which base on network. Train Communication Network is a kind of data traffic network linking many kinds of on-board equipments, which is the core of train control system. In 1999, International Electrotechnical Commission (IEC) adopted a new standard for the communication between on board devices. The standard named IEC-61375-1--Train Communication Network (TCN). TCN is divided into train level communication network -Wire Train Bus (WTB) which is used for connecting dynamically reorganizable vehicles and vehicle level communication network -Multiple Vehicle Bus (MVB) which is used for connecting fixed devices in a vehicle. MVB can still be used for train bus if the train is fixed organized.The Westen’s TCN research goes far ahead of China. In China, only a few university and research lab adopt to TCN or related research. The MVB related technologies and products are monopolized by some foreign companies, which baffles the applications of MVB in our country. This situation did not profit our own products research and establishment of our own standard. For all of the reasons above, the author commit himself to MVB research, analyze and compare MVB to some other fieldbus on technical specification of application field. On the base of understanding the MVB communication mechanism, the author designed a Multifunction Vehicle Bus Controller (MVBC) using Verilog coding description and discussed the design idea and the methodology of every module in the MVBC according to the function requirement in detail. This design adopts Top-down EDA design flow. The simulation tool is VCS, the synthesis tool and programming tool is the ISE6.1. Now, coding design and simulation have passed through, the FPGA system test of board level is on the way. MVBC system is complex, with high qualification of reliability, security, time-critical, stability, life cycle. It still must work exactly under ElectroMagnetic Interference, high temperature difference and shock. So before MVBC that we designed can be used on board, several years test on更多还原