汽車無源MEMS 式TPMS 系統(tǒng)

1、Tire Pressure Monitoring System (TPSM) Xiang Zhao, Ph.D. December 2007 Regulation/LegislationTREAD Act (US)SafetyProper Tire Inflation canreduce blowoutsmitigate hydroplaningreduce braking distance and improve handlingCost SavingProper Tire Inflation canIncrease tire lifeImprove gas mileageWhy Need

2、for Tire Pressure Monitoring?Types of Tire Pressure Monitoring SystemsDirectDirectly measure the tire temperature and pressure via a sensor that is installed on the wheel. IndirectThe most commonly used indirect system utilizes anti-lock braking systems (ABS) to measure the difference in the rotatio

3、nal speed of the four wheels. A wheel that is rotating faster than the others infers that wheel has lower pressure than the other wheels.Auto-LocationAuto-location is the ability of the TPM system to automatically determine the location of each active sensor. Enhanced, direct TPM systems are able to

4、 auto-locate and to inform the driver which tire is under inflated. Tire Pressure SensorECU + Autolearn hardware(2) Radio Frequency Detector (RFD) SensorsDisplay UnitDirectly measures pressure in tire and transmits via RF to a receiverTire Pressure Monitoring System ComponentsTire Pressure SensorBer

5、uSchraderPacificMaterial Cost BreakdownSensor99% of direct TPM Systems currently use MEMS pressure sensors.Major SuppliersMajor Suppliers Market ShareChinese SuppliersChinese SuppliersMarket OpportunityCAGR of 2% in the next 5 yearsIf nothing changes in European or Asian legislationIf the European l

6、egislation makes TPMS mandatory, driven by rising concerns on CO2 emissions, the market would go over $300 M by 2012 (CAGR of 13% in the next 5 years).TPMS market is a market driven by regulations/legislationsTPMS is mandatory on all new cars sold in US since Sept. 1, 2007. In Europe and Asia, the m

7、arket penetration is slow and not supported yet by any regulation.The potential success in imposing TPMS in Europe and/or Asia will create a new rally of high speed market growth, plus current technical challenges, a large number of players still actively develop new systems in order to get a share

8、of the market. What is Next in the TPMS Market ?Progress in indirect measurement systemsMoving the sensor from the valve to the tire inlayEnergy harvesting devices technologies and integrationEach will have very strong impact on the market and would mean a market shift. One of impacts is on Price hu

9、ge price pressure (price keeps getting lower)From Technical Level:Legislation change in Europe for reducing CO2 emissionsMany newcomers coming into the marketFrom Market Level:a CAGR of 2% till 2012 in revenue corresponding to an increase of 12% in volume.Power Consumption7 to 10 year operational li

10、fetime for a direct TPM moduleEach component must have a very low-current standby or idle modeEfficient measurement and transmission hardwareControl algorithm should limit measurements and transmissions to as infrequently as possibleSize and WeightA heavy, bulky battery is simply not an optionUsuall

11、y the entire module (including the electronics, PCB, housing, and mounting hardware) needs to be below 30 to 40 grams to avoid an out-of-balance tireEnvironment Inside the tire is a very harsh environment on electronic products and silicon pressure sensors exposed to airTemperature ranging from -40

12、to +125CMoistureTire mounting greaseOther potentially corrosive materials. Media protection and thermal characteristics are vital to a products survival. Careful package design is necessary to allow a broad temperature range and robust media compatibility.CostSmaller, more highly integrated componen

13、ts to reduce board space can present significant savingsIntegrating the functionality of the TPMS and the remote keyless entry (RKE) receiver can help to reduce the overall system costDesign ChallengesTPMS - Tire Pressure Monitoring Systems MarketPublished by Yole Development, October 20072423.46 (a

14、bout ￥37,000 RMB)Available Market/Technical Information China TPMS Industry Report, 2005-2006Published by ResearchandMarkets, February 2006EUR 1,151.00 (Hard Copy) EUR 1,239.00 (Electronic)Thank You!This technology combines microelectronics with tiny mechanical systems such as valves, gears, and any

15、 other mechanical systems all on one semiconductor chip using nanotechnology to measure pressure.Microelectromechanical systems (MEMS) As a part of the TREAD Act, the U.S National Highway Traffic Safety Administration recently issued Docket No. NHTSA 2005-20586 which requires that all new vehicles sold in the United States with a GVWR of less than 10,000 pounds (4,536 kg) be equipped with a tire pressure monitoring system no later than September 1, 2008.FMVSS 138 (Federal Motor Vehicle Safety System 138) is the regu