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1、氧传感器的检查绝招InspectionskillofoxygensensorQuestioner:yeYi,2012-1-12SatisfactoryanswerTheoxygensensorismountedontheexhaustpipeoftheengineandislocatedbeforethethreecatalyticconverterformeasuringoxygencontentintheexhaustgas.Iftheoxygencontentintheexhaustgas,mixedgasthatleanoxygensensorwillthisinfon
2、nationinputengineelectroniccontrolunit(ECU),ECUinjectionincreasedinstructioninjector;iftheoxygencontentinexhaustgasislow,thatconcentratedgasmixture,reducetheamountoffuelinjectorfromtheECUinstruction,andhelpECUmixgasair-fuelratiocontrolinthetheoreticalvalue(14.7)near・Therefore,theoxygensensor
3、isequivalenttoamixtureconcentrationswitch,whichisanindispensablepartoftheclosed-loopcontrolofEFIengine・1oxygensensorisakindofthermalsensitivevoltagesensorTheoxygensensorindirectlyreflecttheconcentrationofthemixedgasinthecylinder,thisinformationisbasedonthevoltagefluctuationistransferredtothe
4、electroniccontrolunit(ECU),sothemainmethodtodeterminetheperformanceoftheoxygensensoristhedetectionrangeandthefluctuationofvoltagefluetuationsignalandtheoutputoftheoxygensensorfrequency・Ontheotherhand,theenginecanactivatetheoxygensensoronlywhenitreachesacertaintemperature.Therefore,thedetecti
5、onofoxygensensor,theenginemustbepreheatedfullyreachthenommlworkingtemperatureof300DEG~350DEGaftertheoxygensensortodetect,beforethis,resistanceofoxygensensor,oxygensensorasopen,doesnotproduceanyvoltagesignal;iftheengineexhausttemperaturemachinemorethan800DEGC,thecontrolofoxygensensorinterrupt
6、・Atpresent,somemodelsuse2oxygensensors,themainoxygensensor(front)usuallywithheaters,oxygensensorswithoutheaters,accordingto*exhaustpreheating,temperaturemorethan300degreestonormalwork・Forheatingoxygensensors,theheatingresistanceisgenerallyequalto5ohms~7・Iftheheatingresistanceisablated(theres
7、istanceisinfinite),itisdifficultfortheoxygensensortoreachthenormaloperatingtemperaturequickly,andtheoxygensensorshouldbereplacedatthistime・2oxygensensor'sfaultconfirmationadoptsthetimedomainjudgmentmethod"Theso-called''criteriorTreferstothetimedoma
