车辆工程专业英语PPT课件-UNIT-5--DIESEL-FUEL-INJECTION.pptx

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1、UNIT5DIESELFUELINJECTIONTEXTAOverviewofDieselFuelInjectionPROFESSIONALENGLISHUNIT5DIESELFUELINJECTIONTEXTAOverviewofDieselFuelInjectionOverallDieselFuelSystemInjectorPumpTypesDieselInjectorTypesGlowPlugandIntakeAirHeaters本次课学习内容本次课学习目标掌握柴油机喷油系统的组成掌握主要部件的型式及原理掌握有关的专业名词与术语了解翻译技巧—省略NEW

2、WORDSschematic[ski'mætik]a.示意性的alert[ə'lə:t]v.向…发出警报；clog[klɔg]v.&n.阻塞，堵塞nozzle['nɔz(ə)l]n.喷嘴jam[ʤæm]v.&n.堵塞，拥挤trap[træp]n.圈套，陷阱，捕集器plunger['plʌnʤə]n.柱塞，活塞rack[ræk]n.齿条barrel['bær(ə)l]n.桶；v.装入桶内helix['hi:liks]n.螺旋，螺旋状物cutaway['kʌtwei]a.切去一部分的，剖面的instantly['instæntli]ad.立即地，即刻地variation[

3、veəri'ei∫ən]n.变化，变更，变种，变调protrude[prə'tru:d]v.突出，伸出dull[dʌl]v.变迟钝；a.迟钝的，不鲜明的，无光泽的readily['redili]ad.容易，欣然，乐意地waterseparator（油）水分离器inlineinjectorpump直列式喷油泵deliveryvalve出油阀segmentgear扇形齿轮transferpump输送泵，输油泵inlinefuelpump管路串接式燃油泵inwardopeninginjector孔式喷油器outwardopeninginjector轴针式喷油器glowplu

4、g预热塞pumpingchamber预压缩室（腔）wiremesh（金属、钢、塑料）丝网，线网PHRASESANDEXPRESSIONSOverviewofDieselFuelInjectionDieselenginesareusedonsomecarsandlighttrucks.Thedieselengineusestheheatofcompression,insteadofasparkplug,toignitethefuel.Dieselfuelinjectionissimilartogasolineinjection,butrequireshigherinje

5、ctionpressures.Airisdrawnintothecylinderandhighlycompressed.Thecompressionissohighthatthecompressedairwillreachtemperaturesof1000℉(538.2℃).Attheprecisetimethepistonhascompletedthecompressionstroke,dieselfuelissprayedintothecombustionchamber,oranoffsetprechamber.Theintenseheatofthecompre

6、ssedairignitesthefuel,andthepowerstrokefollows.OverallDieselFuelSystemAschematicofadieselfuelsystemlayoutisshowninFig.5-1.Typicaldieselsystemcomponentsincludethetank,fuelpump,filter,injectionpump,injectors,andthenecessaryfuellines.ThesysteminFig.5-1istypicalofnewersystemsthatutilizeacom

7、puter-controlledelectronicfuelinjectionpump.Fig.5-1.AnoverallviewofoneparticulardieselfuelinjectionsystemasusedwithaV-8engine.WaterInFuelSensorSomevehiclesareequippedwithawaterinfuelsensorthatwillalertthedrivertothefactthatwaterispresentinthefuel[1].Thewatermaythenbedrawnoffthr