unit 4 Engine Electronic Control 《汽车实用英语》

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1、汽车实用英语Unit4EngineElectronicControlSystemsServiceUponcompletionofthisunit,youshouldbeableto:OverallObjectives•Learnkeytermsaboutengineelectroniccontrolsystemsinthisunit.•Understandtheprocessofinspectionandrepairofengineelectroniccontrolsystems.•Usemaintenancemanualtodealwiththepracticalprobl

2、ems.Task4.1EngineControlSystemInspection-发动机控制系统检测Task4.2FuelInjectorReplacement-更换喷油器Task4.3EmissionControlInspection-排放控制检测Task4.4IgnitionSystemInspection-点火系统检测Task4.5DiagnosticProcedures-诊断程序TasksIntroductionAutomotiveenginecontrolsystemsmustsatisfydiverseandoftenconflictingrequirements

3、.Servicingthesesystemsregularlyensurestheautomotiverunningnormallyandmeetingstringentstandards.Thefollowingtasks(e.g.enginecontrolsysteminspection,fuelinjectorreplacement,ignitionsysteminspection,etc.)aretheimportantitemsinengineelectronicsystemservicingtocontrolexhaustemissions,fueleconomy

4、andotherperformanceindicatorsoftheengine.TaskDescriptionTask4.1EngineControlSystemInspectionLearningPreparationengineelectronicsystemintakeairflowmeterohmmeterresistanceterminalvoltmeterpositivenegativethrottlepositionsensorknocksensorKeyterms:发动机电控系统进气空气流量计欧姆表电阻终端，端子伏特计，电压表正极负极节气门位置传感器爆震传感

5、器Step1Amaintenancecaseisprovided;Step2Learntheprocessofinspectingtheengineelectronicsystem;Step3Requirestudentstograspthekeytermsinthistask;Step4Trytodescribetheprocessofinspectingtheengineelectronicsystem;Step5Studentsreadrelativematerial;Step6AssessmentPlanandImplement()1.Theresistanceoft

6、heintakeairflowmeterisrelatedtothetemperature.()2.WheninspectingthevoltageofterminalVGandE2G,youshouldturnofftheignitionswitch.()3.Ifairisblownintotheintakeairflowmeter,thevoltageshouldchangewiththeairflow.()4.Iftheresistanceofthecamshafttimingoilcontrolvalveis7.3Ω,itisok.()5.Whentestingthe

7、movementofthecamshafttimingoilcontrolvalve,terminal2shouldbeconnectedwiththepositiveleadofthebattery.AssessmentandFeedbackTrueorFalse()6.Thebadreturningthevalvemaybecausedbyentranceofforeignobjects.()7.Thereisaclearancebetweenthethrottlestopscrewandthrot