汽车专业英语课件(宋进桂).ppt

《汽车专业英语课件(宋进桂).ppt》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

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

2、ems6.10AirConditioningChapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevicesNewWordselectrochemical[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

3、[¸baimi'tælik]a.双金属的strip[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)i

4、sanelectrochemicaldevicethatproducesvoltageanddeliverselectricalcurrent.Thebatteryistheprimary"source"ofelectricalenergyusedinvehiclestoday.Whencharging,thebatteryconvertselectricityintochemicalenergy,andwhendischarging,itconvertschemicalenergyintoelec

5、tricity,producingacurrent.6.1.2CircuitprotectiondevicesItisnecessarytoprotectelectricalcircuitagainstshorting(accidentallytouchingground)thatcouldburnupthewiring.Electricalunitsmustbeprotectedagainstoverloadsalso.Incircuits,Circuitprotectiondevicesmust

6、beinstalledinserieswiththeelectricaldevicesorwiringtobeprotected.Thecommontypesofcircuitprotectiondevicesarefuse,fusiblelinkandcircuitbreaker,seeTable6-1.Chapter6AutomotiveElectricalandElectronicSystems6.1LeadAcidBatteryandCircuitprotectiondevicesAllof

7、thevehiclefusesareusuallycontainedinaholdercalledfuseblockorrelayblock(Figure6-2and6-3).Acircuitmaybeprotectedbyaspecialwirethatactsasafuse.Thiswireiscalledafusiblelink.ACircuitbreakerfeedscurrentthroughabimetallicstripandasetofpointstotheremainderofth

8、ecircuit.Whenthecurrentexceedsthebreaker’srating,thebimetallicstripheatsandbendstoseparatethepoints.Onceitcools,itwillclosethecircuit.Relaysareusedtodirectlargecurrentflowsthatmightoverheatanddamageaswitch,theyareatypeofsolenoidswitchth