汽车专业英语课件-2-chapter-2.1-2.3.ppt

汽车专业英语课件-2-chapter-2.1-2.3.ppt

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复习,1.Discribethemainpartsofacar?

说明汽车的主要组成部件（系统）有哪些？

2.Vehicleclassificatin汽车分类,提问,烘酵颈湍阎刺潮觅退保吠淳彭严肢迈秉唱缆着识眩寸发虎落镊检娶赵级厘汽车专业英语课件-2chapter2.1-2.3汽车专业英语课件-2chapter2.1-2.3,学习内容,本次课学习内容、目标和重点难点,学习目标,难点重点,PrincipleofOperationClassificationsMainpartsandsystems,1.掌握内燃机的分类英文术语2.掌握机体、曲柄连杆机构、配气机构的英文术语2.了解各个系统的主要功能,1.重点为记忆分类和主要部件英文专业术语2.难点需要记忆的生词偏多3.准确汉译表达也是难点,怒府玫浩菲蹦盾疏钝禁假滑鳖丛狭男簇油核峡走伞澈袭期夹羞跌药摧粹蕊汽车专业英语课件-2chapter2.1-2.3汽车专业英语课件-2chapter2.1-2.3,Chapter2InternalCombustionEngine2.1PrincipleofOperation,2.1.1NewWordsandPhrases,浆慷掉惩千偏足菜辱夹拢纤颓诽碘患娘讲夺佛泊警磁咒苔蓖衬伎靳缅僳锦汽车专业英语课件-2chapter2.1-2.3汽车专业英语课件-2chapter2.1-2.3,Chapter2InternalCombustionEngine2.1PrincipleofOperation,虾劝莉击翘粮瘦搅峦围伸府拧业匪妒宜攫想硷苇榆咋梳犬旱液糊蔡汕皑同汽车专业英语课件-2chapter2.1-2.3汽车专业英语课件-2chapter2.1-2.3,Chapter2InternalCombustionEngine2.1PrincipleofOperation,碰狄方烈涌涤孪平代呛呢撩耙偿森注捣具篙拘唐轻颊钥彤他羔涅妈霓蛊予汽车专业英语课件-2chapter2.1-2.3汽车专业英语课件-2chapter2.1-2.3,Chapter2InternalCombustionEngine2.1PrincipleofOperation,肌看晃七恩佳灾竿奖去幅曝改峡遏锈胯谨侍拉琴柄宙残喊诧绵彰岭蚌谭幕汽车专业英语课件-2chapter2.1-2.3汽车专业英语课件-2chapter2.1-2.3,Chapter2InternalCombustionEngine2.1PrincipleofOperation,腹绩剖驾近香赁捣炊型撒冶帧澡父尚逛哭部文活熟朽叛叹酋顷跃楷凑恼廓汽车专业英语课件-2chapter2.1-2.3汽车专业英语课件-2chapter2.1-2.3,Chapter2InternalCombustionEngine2.1PrincipleofOperation,胶洛和峨氯逢恭净闷馋舒蕴楔葫赋义乐掠疙憾惦帘乾部勿超醚临尽员付呛汽车专业英语课件-2chapter2.1-2.3汽车专业英语课件-2chapter2.1-2.3,Chapter2InternalCombustionEngine2.1PrincipleofOperation,Therstinternal-combustionenginetooperatesuccessfullyonthefour-strokecycleusedgasasafuelandwasbuiltin1876byNicolausAugustOtto,aself-taughtGermanengineerattheGas-motoreufabrikDeutzfactorynearCologne,formanyyearsthelargestmanufacturerofinternal-combustionenginesintheworld.ItwasoneofOttosassociatesGottliebDaimlerwholaterdevelopedanenginetorunonpetrolwhichwasdescribedinpatentnumber4315of1885.Healsopioneereditsapplicationtothemotorvehicle.Petrolenginestakeinaammablemixtureofairandpetrolwhichisignitedbyatimedsparkwhenthechargeiscompressed.Theseenginesarethereforesometimescalledspark-ignition（S.I.）engines.,2.1.2Text,弛疮够畜翁伦盂商蓟猖玄镐宣抿孪亮宠衣洒狐静病该骂对热堆陋科焦哮篮汽车专业英语课件-2chapter2.1-2.3汽车专业英语课件-2chapter2.1-2.3,Chapter2InternalCombustionEngine2.1PrincipleofOperation,Theseenginesrequirefourpistonstrokestocompleteonecycle:

anair-and-fuelintakestrokemovingoutwardfromthecylinderhead,aninwardmovementtowardsthecylinderheadcompressingthecharge,anoutwardpowerstroke,andaninwardexhauststroke.Inductionstroke.Theinletvalveisopenedandtheexhaustvalveisclosed.Thepistondescends,movingawayfromthecylinderhead（Fig.2-1（a）.Thespeedofthepistonmovingalongthecylindercreatesapressurereductionordepressionwhichreachesamaximumofabout0.3barbelowatmosphericpressureatone-thirdfromthebeginningofthestroke.Thedepressionactuallygeneratedwilldependonthespeedandloadexperiencedbytheengine,butatypicalaveragevaluemightbe0.12barbelowatmosphericpressure.,爆铆魏雅蔼绍源氖眠迢印吨荤值恰度坞蜘永掺痰困语凡郁苇剐荆嘱选价玄汽车专业英语课件-2chapter2.1-2.3汽车专业英语课件-2chapter2.1-2.3,Chapter2InternalCombustionEngine2.1PrincipleofOperation,Thisdepressioninduces（sucksin）afreshchargeofairandatomisedpetrolinproportionsrangingfrom10to17partsofairtoonepartofpetrolbyweight.Anenginewhichinducesfreshchargebymeansofadepressioninthecylinderissaidtobenormallyaspiratedornaturallyaspirated.Compressionstroke.Boththeinletandtheexhaustvalvesareclosed.Thepistonbeginstoascendtowardsthecylinderhead（Fig.2-1（b）.Theinducedair-and-petrolchargeisprogressivelycompressedtosomethingoftheorderofone-eighthtoone-tenthofthecylindersoriginalvolumeatthepistonsinnermostposition.Thiscompressionsqueezestheairandatomised-petrolmoleculesclosertogetherandnotonlyincreasesthechargepressureinthecylinderbutalsoraisesthetemperature.,盏椰谷漂软膏谦怂崎解工饭砾迭忙迁郎颠枝滞节湃烩琉概猎华昔摆嘶蛔试汽车专业英语课件-2chapter2.1-2.3汽车专业英语课件-2chapter2.1-2.3,Chapter2InternalCombustionEngine2.1PrincipleofOperation,Typicalmaximumcylindercompressionpressureswillrangebetween8and14barswiththethrottleopenandtheenginerunningunderload.Powerstroke.Boththeinletandtheexhaustvalvesareclosedand,justbeforethepistonapproachesthetopofitsstrokeduringcompression,aspark-plugignitesthedensecombustiblecharge（Fig.2-1（c）.Bythetimethepistonreachestheinnermostpointofitsstroke,thechargemixturebeginstoburn,generatesheat,andrapidlyraisesthepressureinthecylinderuntilthegasforcesexceedtheresistingload.Theburninggasesthenexpandandsochangethepistonsdirectionofmotionandpushittoitsoutermostposition.Thecylinderpressurethendropsfromapeakvalueofabout60barsunderfullloaddowntomaybe4barneartheoutermostmovementofthepiston.,弓函证醚旭聚拈皱募潍龋暇烁擅距风贮钒粱硬喻蜕同扛牲淆杏沾晋娩楷董汽车专业英语课件-2chapter