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1毕业设计(论文)常州机电职业技术学院毕业设计（论文）作者：吞吞吐吐他学号：2222222222系部：汽车工程系专业：汽车电子技术题目：汽车常见发动机故障诊断分析指导者：评阅者：2012年4月1毕业设计（论文）中文摘要本文研究的是发动机电控系统的检测与故障诊断知识，介绍了汽车发动机电控系统的概述和发动机电控系统故障诊断基本知识、发动机电子设备的故障诊断、发动机电控系统的检修以及发动机电控系统常见故障的检修等。在发动机电控系统的概述中分别介绍了电控点火装置（ESA）、电子燃油喷射系统（EFI）、废气再循环控制（EGR）、怠速控制（ISC）、气门正时控制、二次空气喷射、油气蒸发控制等，论述了它们的组成、工作原理和作用。在电子设备的故障诊断章节中介绍了汽车线路及电子设备的特点以及电路故障诊断与检修要点。在第五章节中介绍了发动机各电控系统的检修，具体论述了各系统检修的方法，步骤，及注意事项等，并附加了流程图和表格图片。电控系统常见故障的诊断与检修，列举了一些常见的维修案例，论述了故障的现象、可能的原因及故障排除方法等。关键词：发动机电控系统组成工作原理故障检修1毕业设计（论文）外文摘要Title：CommonfaultdiagnosisandanalysisofautomobileengineAbstract：Thestudyofthesubjectistheelectroniccontrolsystemofenginetestandfaultdiagnosisofautomobileengineelectroniccontrolsystem,introducestheoverviewandbasicknowledgeofengineelectroniccontrolsystemfaultdiagnosis,engineelectronicequipmentfaultdiagnosis,enginecontrolsystemmaintenanceandcommonfaultoftheengineelectroniccontrolsystemmaintenance.Intheenginecontrolsystemoverviewintroducesrespectivelytheelectronicignitiondevice(ESA),electronicfuelinjectionsystem(EFI),exhaustgasrecirculationcontrol(EGR),idlespeedcontrol(ISC),valvetimingcontrol,thetwoairinjection,oilgasevaporationcontrol,discussesitscomposition,workingprincipleandeffect.BasicknowledgeinfaultdiagnosisinsectionInthefifthchapterintroducestheengineelectroniccontrolsystemmaintenance,discussedthesystemmaintenancemethod,steps,andthemattersneedingattention,andattachingtheflowdiagramsandtables.Inthefinalchapterdescribestheelectroniccontrolsystemcommonfaultdiagnosisandmaintenance,listssomecommonrepaircase,discussesthefaultphenomenon,possiblecausesandtroubleshootingmethods.Modernautomotiveelectroniccontrolsystemcharacteristics,mainlyreflectedinthefunctionofintensive,controlelectronicsandconnectionstandard,intheanalysisofcontrolsystemfailure,youmustknowtheelectrical,electricequipmentstructure,functionandcharacteristicsoftheelectroniccontrolsystem,thecomposition,functionandworkingprinciple,andavarietyofcommonbreakdownphenomenon,reasonandeliminatingmethods.Keywords:engineelectroniccontrolsystem,compositionworkingprinciplefaultmaintenance1目录1绪论......................................................................11.1研究现状................................................................11.2研究内容...............................................................11.3研究意义...............................................................12汽车发动机电控系统概述....................................................32.1汽车发动机电控系统的组成................................................32.1.1电控点火系统（ESA）.................................................32.1.2电子燃油喷射系统（EFI）.............................................42.1.3废气再循环控制（EGR）...............................................52.1.4怠速控制（ISC）.....................................................52.1.5燃油蒸发控制系统（EVAP）............................................62.1.6可变气门正时和升程电子控制技术（VTEC）..............................72.1.7系统自诊断..........................................................82.2汽车发动机电控系统中的传感器............................................92.2.1温度传感器..........................................................92.2.2压力传感器..........................................................92.2.3节气门位置传感器...................................................102.2.4氧传感器...........................................................102.2.5空气流量传感器.....................................................112.2.6爆震传感器........................................................113发动机电子设备的故障诊断.................................................133.1电路故障的诊断及检修要点...............................................133.1.1测量点的选择.......................................................133.1.2电路故障的检修要点.................................................134发动机各电控系统的检修...................................................154.1发动机燃油供给系统的检修...............................................154.1.1燃油系统的基本检查.................................................154.1.2燃油系统油压及喷油器的检修.........................................174.2发动机点火系统的检修...................................................194.2.1点火提前角检查时的注意事项........................................194.2.2点火系的故障诊断...................................................194.3发动机进排气系统的检修.................................................214.4发动机冷却系统电动冷却风扇的检修.......................................264.4.1电路分析...........................................................2624.4.2维修范例...........................................................274.5发动机充电、启动系统的故障检修.........................................274.5.1充电、起动电路故障检测方法.........................................274.5.2充电系统的常见故障.................................................274.5.3起动系统的常见故障.................................................285发动机电控系统常见故障的检修.............................................295.1不能起动或起动困难故障的检修..........................................295.2怠速不稳、易熄火故障的检修............................................315.2.1怠速过高...........................................................315.2.2怠速过低...........................................................325.2.3怠速运转不平稳.....................................