汽车专业英语 教学课件 作者 宋进桂汽车专业英语课件-section 1Chapter 6-1-3.ppt

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1、Chapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevices6.2ChargingSystem6.3StartingSystem6.4IgnitionSystems6.5LightingSystem6.6powerwindowsystem6.7SupplementalRestraintSystems6.8Cruisecontrolsystems6.9AntiTheftSystems6.10AirCon

2、ditioningChapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevicesNewWordselectrochemical[i¸lektrəu'kemikəl]a.电化（学）的overload['əuvə'ləud]n.超载，过载，过负荷fusible['fju:zəbl]a.易熔的，可熔化的relay['rilei]n.继电器bimetallic[¸baimi'tælik]a.双金属的strip[

3、strip]n.条，带remainder[ri'meində]n.剩余物，其余的人；a.剩余的exceed[ik'si:d]v.超过，胜过Chapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevices6.1.1lead-acidstoragebatteryAlead-acidstoragebattery(Figure6-1)isanelectrochemicaldevicethatproducesvol

4、tageanddeliverselectricalcurrent.Thebatteryistheprimary"source"ofelectricalenergyusedinvehiclestoday.Whencharging,thebatteryconvertselectricityintochemicalenergy,andwhendischarging,itconvertschemicalenergyintoelectricity,producingacurrent.6.1.2Circuitprotectiondevi

5、cesItisnecessarytoprotectelectricalcircuitagainstshorting(accidentallytouchingground)thatcouldburnupthewiring.Electricalunitsmustbeprotectedagainstoverloadsalso.Incircuits,Circuitprotectiondevicesmustbeinstalledinserieswiththeelectricaldevicesorwiringtobeprotected.

6、Thecommontypesofcircuitprotectiondevicesarefuse,fusiblelinkandcircuitbreaker,seeTable6-1.Chapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevicesAllofthevehiclefusesareusuallycontainedinaholdercalledfuseblockorrelayblock(Figure6

7、-2and6-3).Acircuitmaybeprotectedbyaspecialwirethatactsasafuse.Thiswireiscalledafusiblelink.ACircuitbreakerfeedscurrentthroughabimetallicstripandasetofpointstotheremainderofthecircuit.Whenthecurrentexceedsthebreaker’srating,thebimetallicstripheatsandbendstoseparatet

8、hepoints.Onceitcools,itwillclosethecircuit.Relaysareusedtodirectlargecurrentflowsthatmightoverheatanddamageaswitch,theyareatypeofsolenoidswitchth