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1、Unit8BodyElectricalSystemTextAAirConditioningSincetheadventoftheautomotiveairconditioningsysteminthe1940’s,manythingshaveundergoneextensivechange.Improvements,suchascomputerizedautomatictemperaturecontrol(whichallowyoutosetthedesiredtemperatureandhavethesystemadjustautomatically)andimprovement
2、stooveralldurability,haveaddedcomplexitytotoday’smodernairconditioningsystem.TextAAirConditioningVehiclesarefoundtohaveprimarilythreedifferenttypesofairconditioningsystems.Whileeachofthethreetypesdiffer,theconceptanddesignareverysimilartooneanother.Themostcommoncomponentswhichmakeuptheseautomo
3、tivesystemsarethefollowing:compressor,condenser,evaporator,thermalexpansionvalveandaccumulator.Thereferentmaybeinliquidandgaseousstate.LookingatFig.8.1,youcanindentifythestateofrefrigerantandfindtherouteofrefrigerant.TextAAirConditioningTextAAirConditioningVehicleairconditioningusesboththeheat
4、ercoreandtheevaporatortoregulatethetemperatureinaccordancewiththeopeningoftheair-mixdamperandtheopeningofthewatervalve.Anautoairconditioningsystemautomaticallyregulatesthetemperatureoftheinteriortoasettemperature.TheFig.8.2showshowanairconditioningsystemwork.WhentheoperatingmodeissettoAUTOandt
5、hetemperatureisset,thesensorsdetecttheambientairtemperature,interiortemperature,andthesettemperature.Then,thecomputerautomaticallycontrolstheoutlettemperature,blowerspeed,andtheoutletpositioninordertoattainthesettemperature.TextAAirConditioningTextBLightingSystemThelightingsystemofamotorvehicl
6、econsistsoflightingandsignalingdevicesmountedorintegratedtothefront,sides,rear,andinsomecasesthetopofthemotorvehicle.Thepurposeofthissystemistoprovideilluminationforthedrivertooperatethevehiclesafelyafterdark,toincreasetheconspicuityofthevehicle,andtodisplayinformationaboutthevehicle’spresence
7、,position,size,directionoftravel,anddriver’sintentionsregardingdirectionandspeedoftravel.TextBLightingSystemHeadlightHeadlightscasttheirbeamsforwardtoensurethedriver’sfieldofvisionduringnighttimedriving.Theycanbeswitchedtocasthighbeams(
