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1、Unit1FundamentalsofAutomobileTransmissionVariableValveTimingFuelInjectionSystemsofGasolineEngineLesson1Lesson2Lesson5Lesson4Lesson3Lesson6BrakesStructureofAutomobileBasicsofFour-strokeCycleEngineLesson1StructureofAutomobileThebodyandframeTheengineorpowersourceThechassisandtheele
2、ctricalequipment1BodyandFrameFig.1-2illustratesthebodyandframeofatypicalautomobile2EngineTheengineisusedtopowerthevehicle.Theengineisalsocalledthepowersourceormotor.Mostofenginesaredesignedwithseveralsupportingtechnicalsystems.thefuelsystem:mixtheairandfuelintheengine.theignitio
3、nsystem:produceanefficientcombustionprocess.thestartingandchargingsystem:starttheengineandtokeepthebatterychargedduringoperation.thelubricatingsystem:keepallenginemovingpartslubricatedsothatfrictionisreducedinternally.thecoolingsystem:keeptheengineatthemostefficientoperatingtemp
4、erature.theairintakesystem:getairintotheengineefficientlyandwithoutdirt.Theexhaustsystem:cleantheexhaustgasesandtoreducethesoundoftheexhaustnoise.Thepollutioncontrolsystem:reducevariousemissionsfromtheengineincludingcarbonmonoxide,nitrogenoxide(oxidesofnitrogen),andhydrocarbons.
5、3ChassisThechassisconsistsofthetransmission,therunninggearandthesuspensionsystem.ItisshowninFig.1-3.Thetransmission:itisdefinedasthosecomponentsthattransmitthepowerfromtheenginetothewheels.Therunninggear:consistsofthewheels,tires,brakingsystemandsteeringsystem.Thesuspensionsyste
6、m:includessuchcomponentsasthesprings,shockabsorbers,struts,torsionbars,axles,andconnectinglinkages.4ElectricalEquipmentTheelectricalequipmentmainlycomprisesthebattery,alternator,lights,instrumentation,electricaldevicesandelectroniccontrolsystemetc.Lesson2BasicsofFour-strokeCycle
7、EngineThefundamentalpartsoftheconventionalengineareshowninsimplediagrammaticforminFig．2-1whichshowsaacross-sectionthroughthecylinder,pistonandconnectingrodoftheengine.Theidealformconsistsofaplaincylindricalbarrelinwhichthepistonslides,themovementofthepistonor“stroke”being,insome
8、cases,somewhatlongerthanthebore,buttendingtoequ
