汽车专业实用英语 教学课件 作者 陈晟闽 1-engine operation.ppt

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1、WelcomeToENGINESOPERATIONSECTION1OBJECTIVESDiscussfour(4)strokeengineoperationDiscusstwo(2)strokeengineoperationDiscussdieselengineoperationDefinecompressionratioExplainandUnderstandcompressiontesting,leakdowntesting,andvacuumtesting.ENGINEOPERATIONDIESEL4stroke2STROKEGAS4STROKEAV-6enginewithdualo

2、verheadcamshafts凸轮轴凸轮气门弹簧进气门排气门活塞连杆曲轴正时链曲轴链轮TermsofAnEngineFourstrokesoftheengine进气冲程压缩冲程作功冲程排气冲程Engineblockandlowerendpart气缸发动机缸体活塞环活塞连杆连杆端盖连杆轴承油底壳曲轴主轴承Pistonandpistonrings活塞活塞环连杆螺栓连杆端盖曲轴连杆轴颈连杆活塞销Blowbyoccursbetweenthepistonandcylinder气缸壁活塞活塞间隙泄漏（漏气）Crankshaftandpiston活塞环活塞平衡重轴承连杆端盖活塞销连杆曲轴Airinta

3、kepath进气歧管进气道进气口空气滤清器壳体节气门体Fuelsystem燃油进油管活性炭罐燃油管汽油分供管汽油泵燃油压力调节器燃油箱燃油喷射器Lubricationsystem通右气缸盖通左气缸盖机油泵机油集滤器主油道机油滤清器通曲轴主轴颈(4)FOURSTROKEENGINEOPERATION(1)INTAKESTROKEVacuumisCreatedOnIntakeStrokeIntake19in.Hg*(2)COMPRESSIONSTROKEAir/FuelisCompressed9TO1*(3)POWERSTROKRCombustion-PowerStroke*(4)EXHAUS

4、TSTROKEExhaust*ExhaustIntake2-StrokeCycleEngineOperationCombustioneventtakesplaceabovepistonwhiletransfer(Fuel)takesplacebelowpiston(pistontravelsdownwardandforcesair/fueltotopofpiston)Compressiontakesplaceabovepistonwhileintaketakesplacebelowpiston(pistontravelsupward)Therefore,eachcrankshaftrevo

5、lution(360*)producesapowerpulse.PlugsparkseverytimepistonreachesTDC/FUELCOMPRESSIONINTAKE1REEDVALVECLOSESIgnition1COMBUSTIONFUELBURNPOWERSTROKE2AIR/FUELTRANSFER2/FUELCOMPRESSIONINTAKE1480cc60cc480=8to160REVIEWNamethefour(4)strokesina4cycleengine.2.Howmanydegreesofcrankshaftrotationarerequiredtopr

6、oduceonepowerstrokeina(2)cycleengine?Ina(4)cycle?Howmanysparkplugspercylinderdoesadieseluse?Howmuchdifferenceincompressionbetweencylindersisacceptable?Name(3)placesaircanescapeonaleakdowncheckOnwhatstrokeisvacuumcreated?