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Chapter6AutomotiveElectricalandElectronicSystems,6.1LeadAcidBatteryandCircuitprotectiondevices6.2ChargingSystem6.3StartingSystem6.4IgnitionSystems6.5LightingSystem6.6powerwindowsystem6.7SupplementalRestraintSystems6.8Cruisecontrolsystems6.9AntiTheftSystems6.10AirConditioning,Chapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevices,NewWords,Chapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevices,6.1.1lead-acidstoragebatteryAlead-acidstoragebattery(Figure6-1)isanelectrochemicaldevicethatproducesvoltageanddeliverselectricalcurrent.Thebatteryistheprimarysourceofelectricalenergyusedinvehiclestoday.Whencharging,thebatteryconvertselectricityintochemicalenergy,andwhendischarging,itconvertschemicalenergyintoelectricity,producingacurrent.6.1.2CircuitprotectiondevicesItisnecessarytoprotectelectricalcircuitagainstshorting(accidentallytouchingground)thatcouldburnupthewiring.Electricalunitsmustbeprotectedagainstoverloadsalso.Incircuits,Circuitprotectiondevicesmustbeinstalledinserieswiththeelectricaldevicesorwiringtobeprotected.Thecommontypesofcircuitprotectiondevicesarefuse,fusiblelinkandcircuitbreaker,seeTable6-1.,Chapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevices,Allofthevehiclefusesareusuallycontainedinaholdercalledfuseblockorrelayblock(Figure6-2and6-3).Acircuitmaybeprotectedbyaspecialwirethatactsasafuse.Thiswireiscalledafusiblelink.ACircuitbreakerfeedscurrentthroughabimetallicstripandasetofpointstotheremainderofthecircuit.Whenthecurrentexceedsthebreakersrating,thebimetallicstripheatsandbendstoseparatethepoints.Onceitcools,itwillclosethecircuit.Relaysareusedtodirectlargecurrentflowsthatmightoverheatanddamageaswitch,theyareatypeofsolenoidswitchthatcloseselectricalcontacts.Mostofrelaysareusuallycontainedinrelayblockandjunctionblock(J/B).,Figure6-1Batteryconstruction,Chapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevices,Table6-1CircuitprotectiondevicesusedforToyotaautomotivewiringdiaghrams,Chapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevices,Figure6-2Locationofuseblock,relayblockandjunctionblockinapassengercar,Chapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevices,Figure6-3Locationofuseblock,relayblockandjunctionblockinavan,Chapter6AutomotiveElectricalandElectronicSystems6.2ChargingSystem,NewWords,Thechargingsystemusestherotationoftheenginetocreateelectricity.Theelectricityrechargesthebatteryandprovidespowertooperatethevariousvehicleelectricalsystems.Themodernvehiclechargingsystemconsistsofalternatorandvoltageregulator(Figure6-4and6-5).,Chapter6AutomotiveElectricalandElectronicSystems6.2ChargingSystem,Figure6-4ComponentsofatypicalACgenerator,Chapter6AutomotiveElectricalandElectronicSystems6.2ChargingSystem,Figure6-5Explodedviewofatypicalalternator(withvoltageregulator),Chapter6AutomotiveElectricalandElectronicSystems6.3StartingSystem,Moderninternalcombustionenginesarestartedbyusingelectricstartingmotor,orstarter(Figure6-6,6-7and6-8).Astartingsystemconsistsofbattery,ignitionswitch,starterrelayandstarter.Toenergizethestarter,theignitionswitchisturnedtoSTART,whichcompletesanelectricalcircuit.Whenthestarterbeginstoturnthestartergearmovesoutandengagestheringgear,whichspinsthecrankshaft.,NewWords,Chapter6AutomotiveElectricalandElectronicSystems6.3StartingSystem,Figure6
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