毕业论文--电控发动机不能起动的故障诊断与排除》.doc

PAGE 毕业设计(论文) 课题名称: 电控发动机不能起动的故障诊断与排除 电控发动机不能起动的故障诊断与排除 摘 要 随着电控燃油喷射技术的发展和维修认识水平的不断提高，现代轿车中在对装有电控燃油喷射发动机的汽车进行维修时，使用故障诊断仪对发动机电控单元（ECU）进行检测，并根据ECU存储的故障代码进行检修，大多数能判明故障可能发生的原因和部位，会给维修人员的工作带来很大的方便。然而，在对汽车维修时，若仅仅靠故障代码寻找故障，往往会出现判断上的失误。实际上，故障代码仅仅是ECU认可的一个是或否的界定结论，不一定是汽车真正的故障部位，因此，在对汽车进行维修时应综合分析判断，结合汽车故障的现象来寻找故障部位。并且有很多故障是不被ECU所记录的，也就不会有故障代码输出，遇到这种情况时，最为可行的办法就是使用故障诊断仪进行数据流的检测，研究发动机静态或动态数据状况，从而找出故障所在。 关键词:静态数据流、 HYPERLINK /asp/vipsearch.asp?Query=%B5%E7%BF%D8%B7%A2%B6%AF%BB%FAType=K 电控发动机、 HYPERLINK /asp/vipsearch.asp?Query=%B9%CA%D5%CF%D5%EF%B6%CFType=K 故障诊断、故障排除 Abstract As electronic fuel-injected technology development and maintenance knowledge level unceasing enhancement, the modern cars in to equipped with electronic fuel-injected engine car maintenance, using malfunction diagnosis machine of engine control unit (ECU) for testing, and according to the ECU storage failure code overhaul, most can determine possible fault and the reason of place, can give the maintenance personnel work bring great convenience. However, in the vehicle maintenance, if only by fault code search for fault, often can appear errors in judgement In fact, failure code is only ECU approved a yes or no defined conclusion, is not necessarily car true failure positions, therefore, on automobile maintenance should be integrated analysis, judgement, combined with auto fault phenomenon to look for failure positions. And have a lot of the fault is not be ECU record, there wont be fault code output, this happened, most feasible way is using malfunction diagnosis machine in data flow testing, research engine static or dynamic data status, so as to find out the source of the problems. Keywords: static data flow、 electronic-controlled engine、 fault diagnosis 、troubleshooting 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc277337293 摘 要 PAGEREF _Toc277337293 \h 2 HYPERLINK \l _Toc277337294 Abstract PAGEREF _Toc277337294 \h 3 HYPERLINK \l _Toc277337295 引 言 PAGEREF _Toc277337295