Comparison of piezoelectric and electromagnetic energy ... · Comparison of piezoelectric and...
Transcript of Comparison of piezoelectric and electromagnetic energy ... · Comparison of piezoelectric and...
Comparison of piezoelectric and electromagnetic energy harvesting methods for intelligent tyre systemsAS-0.3100 Automaatio- ja systeemitekniikan seminaari23.10.2015Otso Jousimaa
Why?Why intelligent tyres?Why energy harvesting?
Intelligent tyresPresent: pressure sensingFuture: Contact quality sensing?
[Three Three-Axis IEPE Accelerometers on the Inner Liner of a Tire for Finding the Tire-Road Friction Potential Indicators; Niskanen, Tuononen]
Power requiredSleep: ~17 µAActive: ~5 mA[ LOW POWER TIRE PRESSURE MONITORING SYSTEM , Goparaju]
Battery?620 mAh~4 years sleep~5 days active
[Energizer CR2450 datasheet]
Harvesting methodsThermalRFElectromagneticPiezoelectric
PhotovoltaicTriboelectricMagnetostrictiveElectrostatic
Piezoelectric
[Vibrational energy harvesting; Stewaart et al.]
Strain -> electricityHigh voltage High output impedance
600µW – 2,6 mW?[Wikipedia]
ElectromagneticVarying magnetic field -> electricity
Low voltage
Low output impedance
[Electrical power generating tire system ]
Generator impedance was 42 ohms –> ~100µW to 42 ohm load?
FeasibilitySleep power can be providedContinuous activity not possibleDuty cycle of sensor 0.8% - 20%?
Practical mattersReliability?Efficiency of rectification?Storage / conversion losses?
ConclusionUseful power levels are attainable.Rectification loss for EM generator is unacceptable.Experimental work to verify feasibility
Thank you!Questions?