AK-LV-16-2006

Page1of35AK-LV:TeamSupplySpecificationTeamofcompanies:AudiAG,BayerischeMotorenWerkeAG,DaimlerChryslerAG,PorscheAGandVolkswagenAGIssue2006-03-08ElectricIgnitersforPyrotechnicalSystemsRequirementsandTestConditionsAK-LV16pyrotechnicalsystem;airbagsystem;electricigniter;requirementsandtestproceduresContents:1Scope32Definitions32.1Ignition32.2Ignitionpoint32.3Ignitiontime32.4Ignition-delaytime32.5Courseofpressure32.6Characteristicvalues32.7Igniterfamily43Requirementsforelectricigniters43.1Mechanicaldesignandmaterials43.2Igniterresistance43.3Temperaturerange43.4No-firecondition43.5All-firecondition53.6Insulationresistance53.7Electricload53.8ESDstrength53.9Ignition-delaytime53.10Adherencetothecharacteristicvalues54Testsonelectricigniters54.1Testsequenceplan64.2Parametertest74.3Testcurrents74.4Igniterresistancemeasurementduringenvironmentaltesting74.5Droptest74.6Mechanicalshock74.7Thermalshock84.8Moistheat,cyclic84.9Moistheat,constant94.10Heliumleakagetest94.11Temperaturecycletest104.12High-temperaturetest114.13Vibrationtest124.14ESDtests124.15RFtestonelectricignitionelements144.16Statisticalevaluationsequence174.17Ignition-timetest194.18High-currenttest204.19Ignitiontestafterno-fireload204.20No-fireignitiontimetest22TheEnglishtranslationisbelievedtobeaccurate.IncaseofdiscrepanciestheGermanversionshallgovern.NumericalnotationaccordingtoISOpractice(seeVW01000).Page2AK-LV16:2006-024.21Componentanalysis225Documentation236Standardproductiontest237Referencedstandards238Testreportsummary248.1InformationontheDUT248.2Specifications248.3Environmentaltestsaccordingtotestbranch1a248.4Environmentaltestsaccordingtotestbranch1b258.5Environmentaltestsaccordingtotestbranch2258.6Environmentaltestsaccordingtotestbranch3258.7Environmentaltestsaccordingtotestbranch4268.8Environmentaltestsaccordingtotestbranch5268.9Comparisonofcharacteristicvalues278.10DocumentationofESDstrength278.11DocumentationofRFstrength288.12Qualificationofchanges298.13Theaboveinformationisconfirmedascorrect299Inertigniters3010Notesonrequirementsandtests3011Circuitdiagramsandnotesontesting3211.1Circuitforcurrentpulsegenerationaccordingto4.17and4.203211.2Circuitforresistancemeasurementaccordingto4.43311.3Circuitforthehigh-currenttestaccordingto4.183512Changedocumentation35ListofFiguresFigure1:RFtestsetupforigniters14Figure2:Flowchartforstatisticalevaluation17Figure3:Circuitforgeneratingcurrentpulses33Figure4:Schematicdiagramforresistancemeasurement34Figure5:Blockcircuitdiagramforresistancemeasurement34Figure6:Circuitforhigh-currenttest35Page3AK-LV16:2006-021ScopeThisstandardspecifiesrequirementsandtestsforelectricignitersusedinpyrotechnicalsystems.ThepurposeofthetestsaccordingtoSection4istodocumentfulfillmentoftherequirementsaccordingtoSection3.2Definitions2.1IgnitionIgnitionisdefinedastheirreversibletriggeringoftheigniterpyrotechnics.2.2IgnitionpointTheignitionpointisdefinedasthetimeofignition.Theirreversibletriggeringofthepyrotechnicscannotbemeasureddirectly.Therefore,theignitionpointmaybedeterminedbytheoccurrenceofasignificantchangeoftheignitionelement'selectricresistance,theoccurrenceofaflash,theoccurrenceofanoisesignalorstructure-bornenoisesignal,orthestartofthepressureincrease.Ameasuringmethodthatisappropriatefortherespectiveignitertypeshallbeselectedfordeterminationoftheignitionpoint.2.3IgnitiontimeTheignitiontimeisdefinedasthetimefromswitchingontheignitioncurrenttotheignitionpoint.Inordertoensurereliableignition,theignitiontimeshallbeshorterthanthecurrent-flowdurationoftheignitioncurrent.2.4Ignition-delaytimeTheignition-delaytimeisdefinedasthetimefromswitchingontheignitioncurrenttooccurrenceoftheflashorstartofthepressureincrease.2.5CourseofpressureThecourseofpressureismeasuredinaclosedtestchamberwithavolumeoftypically3cm³to18cm³.Forqualificationofanigniter,onlyonevolumesizeispermissible.2.6Characteristicvalues•Igniterresistance•Meanofarandomsampleoftheignition-delaytimeintheall-firetest•All-fireignitiontime•Ignitioncurrentafterno-fireload•Meanofarandomsampleofmaximumpressureinthetestchamber•Meanofarandomsampleofthetimeuponreaching90%ofthemaximumpressureinthetestchamberPage4AK-LV16:2006-022.7IgniterfamilyWithinoneigniterfamily,thefollowingapplies:Samemanufacturingprocess,samecomposition,samecharacteristicdata(igniterresistance,all-firetimeandignitioncurrentafterno-fireload)accordingtoAK-LV16aswellassameprimarychargeandsametypeofsecondarychargebutdifferentquantity.Theprimaryandsecondarychargecanbeofthesametype.InthecaseofminorchangestoanigniterqualifiedaccordingtoAK-LV16,itispermissibletorequalifyonlythechangesuponagreementoftheaffectedOEM.QualificationaccordingtoAK-LV16isacceptedwithinthesameigniterfamily.3RequirementsforelectricignitersAdherencetotheserequirementsshallbedocumentedbymeansofthetestsaccordingtoSection4.3.1MechanicaldesignandmaterialsThemechanicaldesignmustpreventforeignmatterfromenteringtheigniter.Thematerialsusedintheignitermustfulfillthestatutoryrequirements.TheEUEndofLifeVehiclesDirective2000/53/EUinparticularmustbeadheredto.3.2Igniterresi