【作者】 杜征；

【导师】 鲁照权；

【作者基本信息】 合肥工业大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 CAN工业局域网也叫控制器局域网,它属于现场总线的范畴,是一种高速、可靠、并且对分布式实时控制应用来说是低成本的串行总线,它被广泛用在分布式处理系统和实时控制工业应用系统中。本文实现的CAN总线在汽车电子产品检测方面的应用方案具有通用性、可编程、可维护、可扩展升级及智能化等特点。电子产品生产中,电路必然要经过检测阶段。随着科技的进步,电子产品发展迅速,电路一直处于无休止的小型化进程中。自从表面贴装技术(SMT)开始逐渐取代插孔式安装技术以来,电路板上安装的器件变得越来越小,板上单位面积所包含的功能则越来越强大,检测的难度也愈来愈大。汽车电子产品亦是如此,而汽车电子产品的安全性使得其检测过程更为重要。本文针对汽车电子产品的特点,提出了一种基于电路功能的自动检测方法,通过电路板输入输出口对其各功能模块进行检测。通过CAN总线将管理机与检测工位组成网络,将检测环节融入到生产管理之中。本文主要完成了以下工作:1.在检测系统的基础上,组建CAN总线网络。制订了完整的CAN应用层协议与检测信息标准。考虑到检测信息量较大,制定了一种多帧传输的方式,保证信息能准确有效地上传至管理机。2.对各CAN节点的硬件电路进行了设计,完成了各功能模块的硬件匹配及调试。3.在硬件电路的基础上进行软件的设计及调试,使检测工位可以自动下载程序至电路板,与待测电路板配合,按照电路各功能模块的顺序自动完成检测任务。同时对CAN通信软件进行了设计,实现了数据的网络传输。更多还原

【Abstract】 CAN industrial LAN also called controller LAN, it belongs to the scope of Field bus, which is a high-speed, reliable, and low-cost serial bus to the real-time control applications. it was widely used in distributed processing system and real-time control industrial applications system. An applications plan of CAN-bus was achieved in automotive electronics testing in this article, which was versatile, programmable, maintaining, upgrading and expansion of intelligent.The detection stage must be done in the production of electronic products. With the advancement of technology, the development of electronic products was rapid. Circuit has been in the process of small endlessly. Since the surface mount technology (SMT) replaced jack-mount technology gradually, devices installed in circuit boards have been getting smaller and smaller, the function of board has been getting stronger and stronger, the detection was also much harder and harder. So were automotive electronics, and the safety of automotive electronics products made the detection process much more important.A kind of auto-detect method is proposed based on the circuit function according to the characteristics of automotive electronics in this article, which detect each function module of the PCB through its I/O port. It combines the managers and the detected positions to a network with CAN Bus and integrated the detection into the production of management. This article mainly completed the following works:1. The CAN Bus is built up based on detection system. A full CAN application layer protocol and a full detection information standard were formulated. Considering the system has plentiful data being transferred, a Multi-frame method is adopted to ensure all CAN points transmitting data to the supervising computer accurately and effectively.2. Depending on the application needs, CAN points electric circuits are designed. The hardware matching and debugging of each functional module were completed.3. The software was designed and debugged based on the hardware circuit, which made the detected position to download program to the PCB automatically, and measured in accordance with the circuit board with the order of the functional modules finished the detection tasks automatically. At the same time, the CAN communication software has been designed to achieve the data transmission on network.更多还原