基于CAN总线的车载网络信息平台的设计和研究

【作者】 陈绍双；

【导师】 俞小莉；

【作者基本信息】 浙江大学 ， 车辆工程， 2007， 硕士

【摘要】 随着现代车辆电控单元、用电设备数量的剧增，传统点对点的连线方式使得整车线束异常庞杂，由此带来了车身重量增加、成本提高、可靠性降低等诸多问题。车辆网络是目前解决此类问题的一个研究热点。本课题基于CAN总线技术，设计了车载网络信息平台。该车载网络信息平台的架构包括中央控制节点、高低速CAN网关、前车节点、后车节点、车窗节点、液晶显示节点、通讯节点和PC主机。该平台主要实现以下功能：发动机、车速信号采集；CAN总线智能节点设计及通信实现；高低速CAN信号的跨网传输；车窗的电动控制；车灯的电子控制；车载信息液晶显示；CAN数据通过CAN-USB接口交由上位机监控界面进行实时监控和数据存储。本课题完成了整个平台的硬件设计，根据平台需要，采用MC9S12DP256作为节点的控制核心，其集成的msCAN12模块和PCA82C250的组合实现CAN报文的收发，并且用LCD液晶代替传统的机械指针式仪表用于显示车载信息。平台软件结构的设计，采用了模块化的编程思想，每个功能模块实现一个完整单独的功能，各节点通过调用不同模块完成该节点任务。同时该平台还完成软硬件抗干扰设计。实验表明该平台运行正常，具有可靠性高、稳定性好等优点，而且易于扩展更多的节点、功能。同时，针对CAN通讯出现的帧丢失、实时性等问题进行了分析探索，提出并验证了解决方案。更多还原

【Abstract】 Nowadays, the number of electronic controller and electronic equipment in the vehicle is drastically increasing, and the traditional way of wiring brings so many problems such as high weight, cost inflation and low reliability. The automobile network system has become one of the hottest technologies to solve this problem. Based on CAN bus, the author designed an automobile network information platform.The platform includes: Central control node, CAN gateway, Front node, Back node, Window node, LCD display node, Communication node and PC.The platform main functions are: collecting the signals of engine and car speed, the software and hardware design of nodes and their communication implementation, signals filter and transmission across gateway, dynamoelectric control of windows, electronic control of lights, the display and storage of the vehicle information, and monitoring the communication in upper computer through the interface of CAN-USB.According to the need of platform, MC9S12DP256 is chosen for the core part of nodes. To realize the receiving and transferring of CAN messages, the combination of msCAN12 (which is a compositive module of MC9S12DP256) and PCA82C250 is used. Furthermore, the LCD display screen substitutes the classical apparatuses. The thought of modular programming is introduced into the design of software. Every module has its special function. Different nodes use some different modules to complete their missions. At last, the design of anti-interference is conducted, both in terms of software and hardware.The experiment proves that the platform works well, with the advantages of high reliability, stability and expansibility. At the same time, some problems emerging in the experiment are discussed, and also the solutions are put forward and verified.更多还原