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Chapter6AutomotiveElectricalandElectronicSystems,6.1LeadAcidBatteryandCircuitprotectiondevices6.2ChargingSystem6.3StartingSystem6.4IgnitionSystems6.5LightingSystem6.6powerwindowsystem6.7SupplementalRestraintSystems6.8Cruisecontrolsystems6.9AntiTheftSystems6.10AirConditioning,Chapter6AutomotiveElectricalandElectronicSystems6.4IgnitionSystems,NewWords,Chapter6AutomotiveElectricalandElectronicSystems6.4IgnitionSystems,NewWords,Chapter6AutomotiveElectricalandElectronicSystems6.4IgnitionSystems,Thepurposeoftheignitionsystemistocreateasparkthatwillignitethefuel-airmixtureinthecylinderofanengine.Theignitionsystemisdividedintotwosections,theprimarycircuitandthesecondarycircuit.Thelowvoltageprimarycircuitoperatesatbatteryvoltage(12to14.5volts)andisresponsibleforgeneratingthesignaltofirethesparkplugattheexactrighttimeandsendingthatsignaltotheignitioncoil.Theignitioncoilisthecomponentthatconvertsthe12voltsignalintothehigh20,000+voltcharge.Oncethevoltageissteppedup,itgoestothesecondarycircuitwhichthendirectsthechargetothecorrectsparkplugattherighttime.,Chapter6AutomotiveElectricalandElectronicSystems6.4IgnitionSystems,Therearethreedistincttypesofignitionsystems.Theconventionalignitionsystem(Figure6-9)wasmechanicalandelectricalandusednoelectronics.Theelectronicignitionsystem(Figure6-10)startedfindingitswaytoproductionvehiclesduringtheearly70sandbecamepopularwhenbettercontrolandimprovedreliabilitybecameimportantwiththeadventofemissioncontrols.Finally,thedistributorlessignitionsystem(Figure6-11)becameavailableinthemid80s.Thissystemwasalwayscomputercontrolledandcontainednomovingparts,soreliabilitywasgreatlyimproved.Theignitionsystemsonnewerautomobilesarecompletelycontrolledbytheon-boardcomputer.Atypical4-cylinderenginehas2coilsthataremountedtogetherinacoilpack.,Chapter6AutomotiveElectricalandElectronicSystems6.4IgnitionSystems,Onsomevehicles,thereisanindividualcoilforeachcylindermounteddirectlyontopofthesparkplug.Theindependentignitionsystemwithintegratedignitionmodulesintoeachcoilassemblytypicallyusefourwiresconnectedtotheprimarysideoftheassembly(Figure6-12).Thefourwiresconsistofbatterypositive,ground,ignitiontimingsignal,andignitionconfirmationsignal.ThePCMusestheignitionconfirmationsignaltodetermineifacoilisnotoperating.Theprimarycircuitsofthesecoilscannotbetestedwithanohmmeter.Thisdesigncompletelyeliminatesthehightensionsparkplugwiresforevenbetterreliability.Mostofthesesystemsusesparkplugsthataredesignedtolastover100,000miles,whichcutsdownonmaintenancecosts.,Chapter6AutomotiveElectricalandElectronicSystems6.4IgnitionSystems,Figure6-9Conventionalignitionsystem,Chapter6AutomotiveElectricalandElectronicSystems6.4IgnitionSystems,Figure6-10Aelectronicignitionsystem,Chapter6AutomotiveElectricalandElectronicSystems6.4IgnitionSystems,Figure6-11Adistributorlessignitionsystemcircuit,Figure6-12Aindependentignitionsystemthatintegratestheignitionmoduleintoeachcoilassembly,Chapter6AutomotiveElectricalandElectronicSystems6.5LightingSystem,NewWords,6.5.1headlightandtaillightsystem(Figure6-13),Figure6-13Headlightandtaillightsystem,Chapter6AutomotiveElectricalandElectronicSystems6.5LightingSystem,6.5.2Turnsignalandhazardwarninglightsystem(Figure6-14),Figure6-14Turnsignalandhazardwarninglightsystem,6.5.2Turnsignalandhazardwarninglightsystem(Figure6-14),Chapter6AutomotiveElectricalandElectronicSystems6.5LightingSystem,6.5.3Stoplightsystembackuplight(Figure6-15),Figure6-15Stoplightsystem,6.5.4Interiorlightsystem(Figure6-16),Figure6-16Interiorlightsystem,Chapter6AutomotiveElectricalandElectronicSystems6.6powerwindowsystem,ApowerwindowsystemisshowinFigure6-17.,Figure6-17Powerwindowsystem,Chapter6AutomotiveElectricalandElectronicSystems6.7SupplementalRestraintSystems,NewWords,Chapter6AutomotiveElectricalandElectronicSystems6.7SupplementalRestraintSystems,Thesupplementalrestraintsystem(SRS)isdesignedtoworkinconcertwiththeseatbeltstofurtherpreventpersonalinjuryduringahead-oncollisionwithanotherobject.TheSRSutilizesanairbagmodule,frontimpactsensors,aclockspring(orspiralcable),andcontrolmodule.Withthebatterycablesconnected,theSRSsystemisenergizedandmonitoringthefrontimpactsensorsandthesafingsensorforcollisionconfirmationmessages.Whenthevehiclestrikes,orisstruckby,anotherobject,thefrontimpactsensorsandsafingsensorsendimpulsestothecontrolmodule,whichdeterminestheforceanddirectionoftheimpact.Basedonthisinformationthecontrolmoduleeitherdeploysordoesnotdeploytheairbag.,Chapter6AutomotiveElectricalandElectronicSystems6.7SupplementalRestraintSystems,Inflationhappenswhenthereisacollisionforceequaltorunningintoabrickwallat10to15milesperhour(16to24kmperhour).Theairbagsinflationsystemreactssodiumazide(NaN3)withtassi
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