汽车专业英语 黄星 刘春波 黄汽驰 9

《汽车专业英语 黄星 刘春波 黄汽驰 9》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Unit9SafetyAirbagandSeatbeltSystemPart ITechnicalandPracticalReadingPassageASafetyAirbagWhenacarcrashes,theforcerequiredtostopanobjectisverygreatbecausethecar’smomentumhaschangedinstantlywhilethepassengers’hasnot—thereisnotmuchtimetoworkwith.Thegoalofthesupplementalrestraintsystem(SRS)istohelpstop

2、thepassengerwhiledoingaslittledamagetohimaspossible.SRSincludessafetyairbagandsafetybelt.Seefigure9-1.Figure9-1SafetyAirbagAsamatteroffact,airbagsaredesignedtokeepyourhead,neck,andchestfromslammingagainstthedashboard,steeringwheelorwindshieldinafront-endcrash.Anairbagisaninflatablecushion,containi

3、ngairorsomeothergas.Airbagsaremostcommonlyusedforcushioning,inparticularafterveryrapidinflationinthecaseofanautomobilecollision.Seefigure9-2.Figure9-2Theairbagsystemconsistsofthreebasicparts:anairbagmodule,crashsensorsandadiagnosticunit.1.Thedriverairbagmoduleisfoldedintothesteeringwheel,andthepas

4、sengerairbagmoduleislocatedinthedashboardor,morerecently,intheseatordoor.Anairbagmodulehasthreemainparts:theairbag,theinflator,andthepropellant.Thebagitselfismadeofathin,nylonfabric.Theinflatorismadefromeitherstainlesssteelorcastaluminum.Theinflatorfitsintoamodulewithawovennylonbagandabreak-awaypl

5、astichornpadcover.Seefigure9-3.Figure9-3InflatorThemodule,inturn,fitsintothesteeringwheelfordriver’s-sideapplicationsandabovetheglovecompartmentforfrontpassengerapplications.Thepropellantisprimarilysodiumazidecombinedwithanoxidizerandistypicallylocatedinsidetheinflator.Seefigure9-4.Figure9-4AirBag

6、InflationDevice2.Thesensoristhedevicethattellsthebagtoinflate.Vehiclescanhaveoneormorecrashsensors.Theyarelocatedeitherinthefrontofthevehicleand/orinthepassengercompartment.Thesensorsaretypicallyactivatedbyforcesgeneratedinsignificantfrontalornear-frontalcrashes.Seefigure9-5.Figure9-5CrashSensor3.

7、Thediagnosticunitmonitorsthereadinessoftheairbagsystem.Theunitisactivatedwhenthevehicle’signitionisturnedon.Iftheunitidentifiesaproblem,awarninglightalertsthedrivertotakethevehicleforexaminationoftheairbagsystem.