发动机曲轴的检测与维修
25页1、北京理工大学远程教育学院毕业设计(论文)目:曲轴曲轴发动机曲轴的检测与维修专 业: 教学站:学生姓名:指导教师:日 期:摘要本文通过软件和硬件的设计和开发,开发出曲轴曲轴发动机曲轴检测和诊断台 系统。该系统采用多文档界面,采用多线程技术,通过数据采集卡和串行通讯,实 现曲轴曲轴发动机曲轴转速,点火电压,喷油脉冲宽度等信号的实时采集,处理和 显示。为诊断和标记曲轴曲轴发动机曲轴故障所需的修理提供科学依据。本文以几 种常用信号为例分析测试信号。同时,课题对电喷汽油机功率和燃油经济性测试方 法进行了深入的分析和研究,提出了基于燃油喷射脉冲宽度的燃油经济性测试方法。 最后,开发了曲轴曲轴发动机曲轴故障诊断专家系统,详细介绍了知识库的构建和 维护以及推理机制的设计。我们还使用台式系统对常见的曲轴曲轴发动机曲轴故障进行了仿真实验。结果 表明,该系统具有人机界面友好,操作方便,可靠性高,可以对曲轴曲轴发动机曲 轴进行真实的检测和诊断,可以同时进行教学和科研的优点,具有很高的实用价值。关键词:曲轴曲轴发动机曲轴性能测试状态;监测燃油经济性;故障诊断; 专家系统AbstractThrough the d
2、esign and development of software and hardware, this thesis develops a system of engine platform what to be used for carrying on performance measuring and trouble diagnosing to the engine. This system adopts multiple document interface (MDI) ,uses much-thread-technology, and realizes acquisition, disposal, presentation of the signals of engine speed , ignition voltage and injection pulse width etc in real time, through data collecting card and bunches of communication, and provides the scientifi
3、c foundation for engine fault diagnosis and repair on circumstance. This article also takes several usual signals for instance to analyse signals detected. Meanwhile, this thesis makes an intensive study and analysis of methods of testing on Dynamic Performance and Fuel Economy of electronic gasoline injection automobile, and proposes a fuel consumption measurement method based upon injection pulse width. Finally, the thesis develops expert system of engine fault diagnosis, and introduces settin
4、g-up and maintenance of knowledge base, design of reasoning mechanism and so on in detail.The author has done some experiments based on the designed platform to simulate the general failures of engines The experimental results indicate the man machine interface is friendly, the operation is easy and dependability is good etc. This system can serve real engine testing and diagnosing, teaching and scientific research at the same time, therefore the system has wide application prospects.Key words:
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