文档介绍：摘要
随着电子技术的发展和汽车工业的进步,汽车电控系统日益复杂。为了提高各个ECU之间地通信速度,简化线路,也为了降低故障频率,更简便的实现汽车各电子控制单元(ECU)间的通信,现代车载系统中基本都是采用控制器局域网(CAN)技术。随着汽车排放法规的日益严格,故障诊断已成为车载系统上必须的设备。基于CAN总线通信系统的研究,对实现电控单元的在线开发以及故障诊断数据的读取和分析,都具有十分重要的现实意义。
本文首先实现了CAN控制器的协议实现;其次,根据第二代车载故障诊断系统标准OBD-II故障诊断系统的诊断原理以及策略,确定本故障诊断系统所要实现的功能。本文在车辆故障信息诊断系统的研究和车用总线的协议研究上做了较为细致的研究。设计遵守国际CAN标准通讯协议,顺利实现OBD-II故障诊断系统的代码传输及代码类型的即时显示。尽管本诊断系统有只做了一部分研究,有待进一步完善,但是为后续的研究与开发奠定了良好的基础。
关键词:CAN总线;OBD-II系统;故障诊断信息;协议
Abstract
With the development of electronic technology and the progress of the automotive industry, automobile electronic control systems are plex. In order to improve the speed munication between the various ECU, simplified lines, and to reduce the failure rate, easier implementation of automotive electronic control unit of the (ECU) communication between the base of modern vehicle systems are based on Controller work (CAN) technology . With the increasingly stringent vehicle emissions regulations, fault diagnosis has e the necessary equipment on-board systems. CAN munication system based on research on the implementation of online electronic control unit development, and fault data reading and analysis, are of great practical significance.
The system first implemented CAN protocol controller; Secondly, according to the second generation car fault diagnosis system standard OBD-II diagnostic fault diagnosis system principles and strategies, determine the fault diagnosis system functionality to be achieved. In this paper, vehicle fault diagnosis system of information and research vehicle bus protocol to do a more detailed study. Designed ply with international munication protocol CAN, OBD-II smoothly code transmission system fault diagnosis and code types of real-time display. Although this diagnostic system is only a part of the study, to be further improved, but the follow-up research and development has laid a good foundation.
Key Words: CAN Bus;OBD System;Trouble Diagnostic Information; Protocol
目录
第一章课题背景 1
汽车总线的发