汽车无源MEMS 式TPMS 系统

TirePressureMonitoringSystem(TPMS)1TirePressureMonitoringSystem(TPSM)XiangZhao,Ph.D.December2007TirePressureMonitoringSystem(TPMS)2•Regulation/LegislationTREADAct(US)•SafetyProperTireInflationcanreduceblowoutsmitigatehydroplaningreducebrakingdistanceandimprovehandling•CostSavingProperTireInflationcanIncreasetirelifeImprovegasmileageWhyNeedforTirePressureMonitoring?TirePressureMonitoringSystem(TPMS)3TypesofTirePressureMonitoringSystems•DirectDirectlymeasurethetiretemperatureandpressureviaasensorthatisinstalledonthewheel.•IndirectThemostcommonlyusedindirectsystemutilizesanti-lockbrakingsystems(ABS)tomeasurethedifferenceintherotationalspeedofthefourwheels.Awheelthatisrotatingfasterthantheothersinfersthatwheelhaslowerpressurethantheotherwheels.Auto-LocationAuto-locationistheabilityoftheTPMsystemtoautomaticallydeterminethelocationofeachactivesensor.Enhanced,directTPMsystemsareabletoauto-locateandtoinformthedriverwhichtireisunderinflated.TirePressureMonitoringSystem(TPMS)4•TirePressureSensor•ECU+Autolearnhardware•(2)RadioFrequencyDetector(RFD)Sensors•DisplayUnitDirectlymeasurespressureintireandtransmitsviaRFtoareceiverTirePressureMonitoringSystemComponentsTirePressureMonitoringSystem(TPMS)5TirePressureSensorBeruSchraderPacificPCBAsm.77%Stem12%Battery6%Nut3%Case2%MaterialCostBreakdownSensor99%ofdirectTPMSystemscurrentlyuseMEMSpressuresensors.TirePressureMonitoringSystem(TPMS)6MajorSuppliersMajorSuppliers’MarketShareSchrader28%Beru7%Lear14%TRW18%Siemens14%Pacific17%Smartire2%Schrader28%Schrader28%Beru7%Beru7%Lear14%Lear14%TRW18%TRW18%Siemens14%Siemens14%Pacific17%Pacific17%Smartire2%Smartire2%TirePressureMonitoringSystem(TPMS)7ChineseSuppliersTirePressureMonitoringSystem(TPMS)8ChineseSuppliersTirePressureMonitoringSystem(TPMS)9MarketOpportunityTPMSMarketOpportunity168171174177180183150160170180190200200720082009201020112012$MillionCAGRof2%inthenext5yearsIfnothingchangesinEuropeanorAsianlegislationIftheEuropeanlegislationmakesTPMSmandatory,drivenbyrisingconcernsonCO2emissions,themarketwouldgoover$300Mby2012(CAGRof13%inthenext5years).TPMSmarketisamarketdrivenbyregulations/legislations•TPMSismandatoryonallnewcarssoldinUSsinceSept.1,2007.•InEuropeandAsia,themarketpenetrationisslowandnotsupportedyetbyanyregulation.ThepotentialsuccessinimposingTPMSinEuropeand/orAsiawillcreateanewrallyofhighspeedmarketgrowth,pluscurrenttechnicalchallenges,alargenumberofplayersstillactivelydevelopnewsystemsinordertogetashareofthemarket.TirePressureMonitoringSystem(TPMS)10WhatisNextintheTPMSMarket?•Progressinindirectmeasurementsystems•Movingthesensorfromthevalvetothetireinlay•EnergyharvestingdevicestechnologiesandintegrationEachwillhaveverystrongimpactonthemarketandwouldmeanamarketshift.OneofimpactsisonPrice–hugepricepressure(pricekeepsgettinglower)FromTechnicalLevel:•LegislationchangeinEuropeforreducingCO2emissions•ManynewcomerscomingintothemarketFromMarketLevel:•aCAGRof2%till2012inrevenuecorrespondingtoanincreaseof12%involume.TirePressureMonitoringSystem(TPMS)11PowerConsumption•7to10yearoperationallifetimeforadirectTPMmodule•Eachcomponentmusthaveaverylow-currentstandbyoridlemode•Efficientmeasurementandtransmissionhardware•ControlalgorithmshouldlimitmeasurementsandtransmissionstoasinfrequentlyaspossibleSizeandWeight•Aheavy,bulkybatteryissimplynotanoption•Usuallytheentiremodule(includingtheelectronics,PCB,housing,andmountinghardware)needstobebelow30to40gramstoavoidanout-of-balancetireEnvironmentInsidethetireisaveryharshenvironmentonelectronicproductsandsiliconpressuresensorsexposedtoair•Temperaturerangingfrom-40to+125°C•Moisture•Tiremountinggrease•Otherpotentiallycorrosivematerials.Mediaprotectionandthermalcharacteristicsarevitaltoaproduct’ssurvival.Carefulpackagedesignisnecessarytoallowabroadtemperaturerangeandrobustmediacompatibility.Cost•Smaller,morehighlyintegratedcomponentstoreduceboardspacecanpresentsignificantsavings•IntegratingthefunctionalityoftheTPMSandtheremotekeylessentry(RKE)receivercanhelptoreducetheoverallsystemcostDesignChallengesTirePressureMonitoringSystem(TPMS)12TPMS-TirePressureMonitoringSystemsMarketPublishedbyYoleDevelopment,October2007£2423.46(about￥37,000RMB)AvailableMarket/TechnicalInformationChinaTPMSIndustryReport,2005-2006PublishedbyResearchandMarkets,February2006EUR€1,151.00(HardCopy)EUR€1,239.00(Electronic)TirePressureMonitoringSystem(TPMS)13ThankYou!TirePressureMonitoringSystem(TPMS)14Thistechnologycombinesmicroelectronicswithtinymechanicalsystemssuchasvalves,gears,andanyothermechanicalsystemsallononesemiconductorchipusingnanotechnologytomeasurepressure.Microelectromechanicalsystems(MEMS)TirePressureMonitoringSystem(TPMS)15AsapartoftheTREADAct,theU.SNationalHighwayTrafficSafetyAdministrationrecentlyissuedDocketNo.NHTSA2005-20586whichrequiresthatallnewvehiclessoldintheUnitedStateswithaGVWRoflessthan10,000pounds(4,536kg)beequippedwithatirepressuremonitoringsystemnolaterthanSeptember1,2008.FMVSS138(FederalMotorVehicleSafetySystem138)istheregulatoryportionoftheU.S.TREADActthatregulatestirepressuremonitoring(