轮胎压力监测在汽车使用被动声表面波传感器大学毕业论文外文文献翻译及原文文档格式.docx

轮胎压力监测在汽车使用被动声表面波传感器大学毕业论文外文文献翻译及原文文档格式.docx

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轮胎压力监测在汽车使用被动声表面波传感器

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翻译日期：

2017.02.14

轮胎压力监测

中英文资料翻译

参考文献

MonitoringtheTirePressureatCarsUsingPassiveSAWSensors

AlfredPohl1,G.Ostermayer},L.Reindl2,F.Seifert

1）AppliedElectronicsLaboratory,UniversityoETechnology,Gusshausstrasse27,A-1040Vienna,Austria

2）SiemensCentralResearchLab.,OttoHahnRing6,D-$1739Munich,Germany

Abstract：

Inourpaperwepresenttheapplicationofsurfaceacousticwave（SAW）sensorstothecontinuousmanitaringofthetirepressureinroadvehicles.Withthese,thetirepressurecanbereadoutineveryphaseofdriving.Weshowtheimplementedprototypesetupformeasurementofthetirepressure,theappliedSAWsensors,improvedversionsandtheinterrogationsetup.Theproblemsinpracticalapplicationarediscussed.Experimentalresultsmeasuringthetirepressureduringtestridesarepresented.

INTRODUCTION

Operatingaroadvehicle,amalfunctionofthetiresinmotionduetoatirepuncturecancauseseriousaccidentsandendangerhumanlife.Furthermore,nowadaysmanufacturersofcarstrytosavethesparewheelinvehicles.Usuallyitonlycostsweightandspace,thereforeityieldsahigherfuelconsumption,althoughitwillberequiredlessthanonetimeinmorethantenyearsofacar'

slife.Thisonlycanbedone,iftheairpressureinthetirescanbemeasuredevenduringdriving.Currentlyusedsensorscontainactivecomponents,poweredbyaLithiumbattery.Themassofthesesensorassembliesisabout20gramscausinghighdynamicload.Afewyearsago,wirelessIyinterrogableSAWdevicesfarsensorapplicationswereinvented.[1，2,3].UsinganoneportSAWdelaylineconnectedtoanantennaonly,

anRFinterrogationsignalisfedintoandthesensorresponse,carryingthesensorinformationisretransmittedwirelesslytotheinterrogator.Thesesensorsarecapableformeasurementoftemperature,mechanicalload,forceanddisplacement,etc.Theadvantageis,thatSAWsensorsaretotallypassivedevicesandcontainneitherpowersupplynorsemiconductors.Theywithstandtemperaturesuptoseveralhundredsofdegreecentigrades,theirlifetimeismuchlongerthanthatofbatterypoweredsystems.Further,invehiclesstrongelectromagneticpollutionisgeneratedbyignitionsystemsetc.SAWsensorsoperatewithoutriskofdamageeveninroughenvironments.FirstwediscusspressuremeasurementemployingSAWsensorswithwirelessinterrogation.Wepresentsometypesofsensorassembliesandtheinterrogationsystem.Nextwediscusstheimplementationintothecarandthenwepresentexperimentallyresults.Finallyabriefsummaryconcludesthecontentofthepaper.

SAWPRESSURESENSORS

TheelectricalbehaviourofapassiveSAWpressuresensoralwaysisthatofaoneportdelaylinewithmultiplereflectorsoraresonator,respectively.Inthedelaylinecase,theinterrogatortransmitsaburstsignal,thesensorrespondswithachainofbursts,oneforeveryreflectorarrangedatthesubstrate'

ssurface.Thedifferentialdelaybetweentwoormoreresponsesignalsisevaluated.Tomeasuresomephysicalvalue,theparameterhastobeconvertedintoachangeofsensor'

ssurfacelengthorsurfaceacousticwave'

svelocity,respectively.ThedelayrioftheresponseofareflectoriistheratioofSAWpropagationlengthLionthesubstrate'

ssurfaceandpropagationvelocityv,.Affectingthesensorwithameasurandcausesascalingofthesensor'

sresponsetobeobservedasindividualdelayshiftsArioftheresponsesignalssioriginatingfrotmhereflectorsi.Mechanicalmeasurandscanbecollectedbyloadingthesensormechanically.Apartfromstretchingandcompressing,utilizedforwirelessmeasurementoftorque,etc.theSAWsensor'

ssubstratecanbebent.Pressurecanaffectthesensorbybendingamembrane,shiftingtheedgeofasensorfixedontheotherside.Herethesensorisloadedtobebentduetoashiftofthecenterofamembraneloadedbythepressure.Ontheotherhandthesensorcandirectlybefittedtothemembraneorapiezoelectric

membranerepresentingtheSAWsubstratecanbeused.Figure1showsthesemethods.

Fig.1:

a）Membraneconvertingpressuretoshiftbending

theSAWsensor（SAWS）

b）SAWsensorfittedtothemembrane

Thenextstepistocoverthesensormembranebyacapconsistingofaspacerframeandaquartzcoverplate.ThisyieldsanintegratedpressurechamberSAWsensor[4]（fig.2）.

Fig.2:

IntegratedpressurechamberSAWsensor

ThecoverprotectstheSAWgeneratingmetallicstructurefromoxidationandthesurfacefromdust.ThecavitycanbefiIledwithagasatreferencepressure.Ifthecavityisevacuated,absolutepressurevaluescanbemeasured.MeasurementismadebyinterrogationusingsimpleRFburstsignals.There