汽车专业英语课件(宋进桂)Chapter 6-4-7

Chapter6AutomotiveElectricalandElectronicSystems

6.1LeadAcidBatteryandCircuitprotectiondevices

6.2ChargingSystem6.3StartingSystem6.4IgnitionSystems6.5LightingSystem6.6powerwindowsystem6.7SupplementalRestraintSystems6.8Cruisecontrolsystems6.9AntiTheftSystems6.10AirConditioningChapter6AutomotiveElectricalandElectronicSystems

6.4IgnitionSystems

NewWordsresponsible[ri'spɔnsəbl]a.有责任感的，有责任的，负责的distinct[di'stiŋkt]a.截然不同的，有区别的，明显的，清楚的electronics[ilek'trɔniks]n.电子学，电子设备reliability[ri¸laiə'biliti]n.可靠性，可靠程度advent['ædvənt]n.出现，到来on-boarda.在船上，在车上Chapter6AutomotiveElectricalandElectronicSystems

6.4IgnitionSystems

NewWordsconfirmation[¸kɔnfə'meiʃən]n.确定，确认，证实ohmmeter['əum¸mi:tə]n.欧姆计，电阻表tension['tenʃən]n.拉紧，绷紧，拉力，张力，电压condenser[kən'densə]n.冷凝器电容器pickup['pikʌp]n.收集，整理，拾音器，传感器，皮卡integrate['intigreit]v.使成一体，使结合，使合并Chapter6AutomotiveElectricalandElectronicSystems

6.4IgnitionSystems

Thepurposeoftheignitionsystemistocreateasparkthatwillignitethefuel-airmixtureinthecylinderofanengine.Theignitionsystemisdividedintotwosections,theprimarycircuitandthesecondarycircuit.Thelowvoltageprimarycircuitoperatesatbatteryvoltage(12to14.5volts)andisresponsibleforgeneratingthesignaltofirethesparkplugattheexactrighttimeandsendingthatsignaltotheignitioncoil.Theignitioncoilisthecomponentthatconvertsthe12voltsignalintothehigh20,000+voltcharge.Oncethevoltageissteppedup,itgoestothesecondarycircuitwhichthendirectsthechargetothecorrectsparkplugattherighttime.Chapter6AutomotiveElectricalandElectronicSystems

6.4IgnitionSystems

Therearethreedistincttypesofignitionsystems.Theconventionalignitionsystem(Figure6-9)wasmechanicalandelectricalandusednoelectronics.Theelectronicignitionsystem(Figure6-10)startedfindingitswaytoproductionvehiclesduringtheearly'70sandbecamepopularwhenbettercontrolandimprovedreliabilitybecameimportantwiththeadventofemissioncontrols.Finally,thedistributorlessignitionsystem(Figure6-11)becameavailableinthemid'80s.Thissystemwasalwayscomputercontrolledandcontainednomovingparts,soreliabilitywasgreatlyimproved.Theignitionsystemsonnewerautomobilesarecompletelycontrolledbytheon-boardcomputer.

Atypical4-cylinderenginehas2coilsthataremountedtogetherinacoil"pack".Chapter6AutomotiveElectricalandElectronicSystems

6.4IgnitionSystems

Onsomevehicles,thereisanindividualcoilforeachcylindermounteddirectlyontopofthesparkplug.Theindependentignitionsystemwithintegratedignitionmodulesintoeachcoilassemblytypicallyusefourwiresconnectedtotheprimarysideoftheassembly(Figure6-12).Thefourwiresconsistofbatterypositive,ground,ignitiontimingsignal,andignitionconfirmationsignal.ThePCMusestheignitionconfirmationsignaltodetermineifacoilisnotoperating.Theprimarycircuitsofthesecoilscannotbetestedwithanohmmeter.Thisdesigncompletelyeliminatesthehightensionsparkplugwiresforevenbetterreliability.Mostofthesesystemsusesparkplugsthataredesignedtolastover100,000miles,whichcutsdownonmaintenancecosts.Chapter6AutomotiveElectricalandElectronicSystems

6.4IgnitionSystems

Figure6-9ConventionalignitionsystemChapter6AutomotiveElectricalandElectronicSystems

6.4IgnitionSystems

Figure6-10AelectronicignitionsystemChapter6AutomotiveElectricalandElectronicSystems

6.4IgnitionSystems

Figure6-11Adistributorlessignitionsystemcircuit

Figure6-12AindependentignitionsystemthatintegratestheignitionmoduleintoeachcoilassemblyChapter6AutomotiveElectricalandElectronicSystems

6.5LightingSystem

headlight['hedlait]n.前照灯taillight['teillait]n.尾灯dimmer['dimə]n.调光器courtesy['kə:tisi]n.礼貌，殷勤，好意hazard['hæzəd]n.危险，危害物NewWords

6.5.1headlightandtaillightsystem(Figure6-13)Figure6-13HeadlightandtaillightsystemChapter6AutomotiveElectricalandElectronicSystems

6.5LightingSystem

6.5.2Turnsignalandhazardwarninglightsystem(Figure6-14)

Figure6-14Turnsignalandhazardwarninglightsystem

6.5.2Turnsignalandhazardwarninglightsystem(Figure6-14)Chapter6AutomotiveElectricalandElectronicSystems

6.5LightingSystem

6.5.3Stoplightsystembackuplight(Figure6-15)

Figure6-15Stoplightsystem

6.5.4Interiorlightsystem(Figure6-16)Figure6-16InteriorlightsystemChapter6AutomotiveElectricalandElectronicSystems

6.6powerwindowsystem

ApowerwindowsystemisshowinFigure6-17.Figure6-17PowerwindowsystemChapter6AutomotiveElectricalandElectronicSystems

6.7SupplementalRestraintSystems

NewWordsrestraint[ri'streint]n.约束，控制，阻止，约束措施inflation[in'fleiʃən]n.通货膨胀，膨胀，充气sodium['səudiəm]n.钠azide['æzaid]n.叠氮化物potassium[pə'tæsiəm]n.钾nitrate['naitreit]n.硝酸盐pad[pæd]n.垫，衬垫，护垫pretensionern.预收[张]紧器[装置]Chapter6AutomotiveElectricalandElectronicSystems

6.7SupplementalRestraintSystems

Thesupplementalrestraintsystem(SRS)isdesignedtoworkinconcertwiththeseatbeltstofurtherpreventpersonalinjuryduringahead-oncollisionwithanotherobject.TheSRSutilizesanairbagmodule,frontimpactsensors,aclockspring(orspiralcable),andcontrolmodule.Withthebatterycablesconnected,theSRSsystemisenergizedandmonitoringthefrontimpactsensorsandthesafingsensorforcollisionconfirmationmessages.Whenthevehiclestrikes,orisstruckby,anotherobject,thefrontimpactsensorsandsafingsensorsendimpulsestothecontrolmodule,whichdeterminestheforceanddirectionoftheimpact.Basedonthisin