汽车故障诊断专家系统的研究和设计

摘要

本文介绍了汽车故障诊断专家系统的基本结构及其开发的基本方法，论述了汽车故障诊断专家系统软件的开发研究的意义和设计中的难点，针对汽车故障的复杂性特点模拟经验丰富的维修专家的诊断思路及方法，利用Delphi7进行编程，建立友好的人机界面，依据计算机数据结构原理，采用故障树的数据结构和关系数据库原理完成知识表示建立完善的知识库，实现了确定性故障诊断所需的知识库和推理机。从而可使用户通过人机对话的形式方便、快速、准确地找出故障原因，大大地提高汽修行业的效益及汽车的使用寿命。

关键字：汽车故障诊断专家系统

The paper introduces Automobile Fault Diagnosis Expert System of basic structure and development of basic methods. Discusses the software of Automobile Fault Diagnosis Expert System 's research meaning and the difficulty in the design. Aiming at the complexity characteristic of the fault ,simulating the way that experienced diagnosis maintenance of expert thinking, using Delphi7, established friendly human-machine interface. According to the principle structure data of the computer , adopt the fault tree's data structure and relation theories of database to accomplish the representation of knowledge, and realized the uncertainty of knowledge base for fault diagnosis and reasoning machine. The user could find fault convenient, fast and accurately through the man-machine dialogue form , greatly improve the automobile industry's efficiency and the automobile's service life.

Key words：automobile fault diagnosis expert system

1 绪论 ................................................................ - 1 -

1.1 汽车故障诊断技术的发展趋势..................................... - 1 -

1.1.1 国外发展概况 ............................................. - 1 -

1.1.2 国内发展概况 ............................................. - 1 -

1.1.3 汽车故障诊断技术的发展趋势 ............................... - 2 -

1.2 汽车故障诊断专家系统简介....................................... - 3 -

1.2.1 汽车诊断专家系统的功能与特点 ............................. - 3 -

1.2.2 研究汽车诊断专家系统的意义 ............................... - 4 -

2. delphi7.0软件简介.................................................. - 5 -

3. 汽车系统的故障分析 ................................................. - 8 -

3.1 汽车故障的产生................................................. - 8 -

3.2 汽车故障的特点................................................. - 9 -

3.3 本章小结....................................................... - 9 -

4. 汽车故障诊断专家系统设计与开发 .................................... - 10 -

4.1 汽车故障诊断专家系统的一般结构................................ - 10 -

4.2 基于Delphi的汽车故障诊断专家系统的特点....................... - 10 -

4.3 故障诊断专家系统各模块的建立.................................. - 11 -

4.3.1 故障诊断模块 ............................................ - 11 -

4.3.2 故障诊断知识库的建立 .................................... - 17 -

4.3.3 知识库的基本管理 ........................................ - 18 -

4.3.4 知识库检索模块 .......................................... - 22 -

4.3.5 推理机制 ................................................ - 24 -

4.4 结论.......................................................... - 24 -

5. 总结和展望 ........................................................ - 25 -

5.1 总结.......................................................... - 25 -

5.2 展望.......................................................... - 25 -

6. 致谢 .............................................................. - 27 -

7. 参考文献 .......................................................... - 28 -