汽车无源MEMS 式TPMS 系统.ppt

TirePressureMonitoringSystem(TPSM),XiangZhao,Ph.D.,December2007,Regulation/LegislationTREADAct(US)SafetyProperTireInflationcanreduceblowoutsmitigatehydroplaningreducebrakingdistanceandimprovehandlingCostSavingProperTireInflationcanIncreasetirelifeImprovegasmileage,WhyNeedforTirePressureMonitoring?,TypesofTirePressureMonitoringSystems,DirectDirectlymeasurethetiretemperatureandpressureviaasensorthatisinstalledonthewheel.IndirectThemostcommonlyusedindirectsystemutilizesanti-lockbrakingsystems(ABS)tomeasurethedifferenceintherotationalspeedofthefourwheels.Awheelthatisrotatingfasterthantheothersinfersthatwheelhaslowerpressurethantheotherwheels.,Auto-Location,Auto-locationistheabilityoftheTPMsystemtoautomaticallydeterminethelocationofeachactivesensor.Enhanced,directTPMsystemsareabletoauto-locateandtoinformthedriverwhichtireisunderinflated.,TirePressureSensorECU+Autolearnhardware(2)RadioFrequencyDetector(RFD)SensorsDisplayUnit,DirectlymeasurespressureintireandtransmitsviaRFtoareceiver,TirePressureMonitoringSystemComponents,TirePressureSensor,Beru,Schrader,Pacific,MaterialCostBreakdown,Sensor,99%ofdirectTPMSystemscurrentlyuseMEMSpressuresensors.,MajorSuppliers,MajorSuppliersMarketShare,ChineseSuppliers,ChineseSuppliers,MarketOpportunity,IftheEuropeanlegislationmakesTPMSmandatory,drivenbyrisingconcernsonCO2emissions,themarketwouldgoover$300Mby2012(CAGRof13%inthenext5years).,TPMSmarketisamarketdrivenbyregulations/legislations,TPMSismandatoryonallnewcarssoldinUSsinceSept.1,2007.InEuropeandAsia,themarketpenetrationisslowandnotsupportedyetbyanyregulation.,ThepotentialsuccessinimposingTPMSinEuropeand/orAsiawillcreateanewrallyofhighspeedmarketgrowth,pluscurrenttechnicalchallenges,alargenumberofplayersstillactivelydevelopnewsystemsinordertogetashareofthemarket.,WhatisNextintheTPMSMarket?,ProgressinindirectmeasurementsystemsMovingthesensorfromthevalvetothetireinlayEnergyharvestingdevicestechnologiesandintegration,Eachwillhaveverystrongimpactonthemarketandwouldmeanamarketshift.OneofimpactsisonPricehugepricepressure(pricekeepsgettinglower),FromTechnicalLevel:,LegislationchangeinEuropeforreducingCO2emissionsManynewcomerscomingintothemarket,FromMarketLevel:,aCAGRof2%till2012inrevenuecorrespondingtoanincreaseof12%involume.,PowerConsumption7to10yearoperationallifetimeforadirectTPMmoduleEachcomponentmusthaveaverylow-currentstandbyoridlemodeEfficientmeasurementandtransmissionhardwareControlalgorithmshouldlimitmeasurementsandtransmissionstoasinfrequentlyaspossibleSizeandWeightAheavy,bulkybatteryissimplynotanoptionUsuallytheentiremodule(includingtheelectronics,PCB,housing,andmountinghardware)needstobebelow30to40gramstoavoidanout-of-balancetireEnvironmentInsidethetireisaveryharshenvironmentonelectronicproductsandsiliconpressuresensorsexposedtoairTemperaturerangingfrom-40to+125CMoistureTiremountinggreaseOtherpotentiallycorrosivematerials.Mediaprotectionandthermalcharacteristicsarevitaltoaproductssurvival.Carefulpackagedesignisnecessarytoallowabroadtemperaturerangeandrobustmediacompatibility.CostSmaller,morehighlyintegratedcomponentstoreduceboardspacecanpresentsignificantsavingsIntegratingthefunctionalityoftheTPMSandtheremotekeylessentry(RKE)receivercanhelptoreducetheoverallsystemcost,DesignChallenges,TPMS-TirePressureMonitoringSystemsMarketPublishedbyYoleDevelopment,October20072423.46(about￥37,000RMB),AvailableMarket/TechnicalInformation,ChinaTPMSIndustryReport,2005-2006PublishedbyResearchandMarkets,February2006EUR1,151.00(HardCopy)EUR1,239.00(Electronic),ThankYou!,Thistechnologycombinesmicroelectronicswithtinymechanicalsystemssuchasvalves,gears,andanyothermechanicalsystemsallononesemiconductorchipusingnanotechnologytomeasurepressure.,Microelectromechanicalsystems(MEMS),AsapartoftheTREADAct,theU.SNationalHighwayTrafficSafetyAdministrationrecentlyissuedDocketNo.NHTSA2005-20586whichrequiresthatallnewvehiclessoldintheUnitedStateswithaGVWRoflessthan10,000pounds(4,536kg)beequippedwithatirepressuremonitoringsystemnolaterthanSeptember1,2008.FMVSS138(FederalMotorVehicleSafetySystem138)istheregulatoryportionoftheU