汽车检测与维修技术专业毕业论文

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1、2014届毕业设计（论文）汽油发动机管理系统故障诊断与维修专业：助学站点：　考籍号：姓名：指导教师：2014年10月摘要发动机是汽车的动力源，它是将一种形式的能量转化为机械能的机器。本文对电喷发动机管理系统各部分的组成和原理进行了论述，并以博世M7系列发动机管理系统为例，浅谈电喷发动机常见故障的诊断和分析方法。本文的重点是通过两个实际案例，迈腾发动机抖动故障和低温时速腾车无法启动故障，介绍了电喷发动机的常见故障的诊断思路和诊断过程。关键词：汽油发动机管理系统;传感器;ECU;执行器;故障诊断ABSTRACTEngineisthepowersourceof

2、theautomobile,whichturnaformofenergyintoanotherformofenergymachine.Inthispaper,thecompositionandprincipleofeachpartoftheenginemanagementsystemarediscussed.AndToBoschM7seriesenginemanagementsystemasanexample,thispaperwillprobeintocompositionandprincipleoftheenginemanagementsystem.

3、Thefocusofthispaperisthroughtwoactualcases,MagotanenginejitterfaultandlowtemperatureSagitarcarwouldn'tstartfault,introducesthecommonfaultofEFIenginefaultdiagnosisprocess.Keywords:gasolineenginemanagementsystem;sensor;ECU;actuator;faultdiagnosis目录第1章绪论·····························

4、·······················11.1汽油发动机的工作原理········································11.1.1进气行程················································11.1.2压缩行程················································11.1.3做功行程················································21.1.4排气行程···················

5、······························21.2汽油发动机的总体结构·········································21.2.1曲柄连杆机构·············································21.2.2配气机构················································31.2.3燃油供给系统············································31.2.4润滑系统··············

6、··································41.2.5冷却系统················································41.2.6点火系统················································51.2.7起动系统················································5第2章电喷发动机管理系统组成······························62.1电喷发动机管理系统工作原理··········

7、·························62.2电子控制器(ECU）··············································62.2.1输入回路·················································72.2.2A/D（模拟／数字）转换器···································72.2.3微型计算机（微机）········································82.2.4输出回路·················

8、································82.3传感器·