Design And Experiment Of Multi-chip Piezoelectric Self-powered Device In Tire Pressure Monitoring System

More and more people use the car and at the same time driving safety is moreand more attention. Tire pressure and temperature is the important element of drivingsafety. Tire pressure alarm Measurement system can monitoring the tire pressure andtemperature inside around the clock, and give short-term interruption of the measuredtire pressure and temperature feedback to the driver, so the driver can know thedanger in advance. At present the usual TPMS in the market is powered up by battery.Its has a short life and a low stability. Changing the battery is not convenience. Thepaper improves these disadvantages. We prefer the good performance parameter ofthe piezoelectric material, the high power, environmental protection and energysaving, and a long life. It collect electric energy by vibration produced by driving avehicle, and power up by itself.This thesis laid on the previous brothers’ article on tire pressure basis since piezoalarm on power structures. Using electric effect design multi-chip piezoelectricvibrator as mechanical energy and electric energy convert device, aimed at resolvingthe positive and negative charges occur when a single-chip and dual-chip cantilevergeneration model in the vicinity of second-order resonance region offsetting problemsand achieve broadband power generation and energy harvesting. In the modeling andverification formula, modal combination of simulation and experimental data on thebasis of comparison of multi-chip simulation of piezoelectric driving stateself-powered power plant structural design and experimental data collection,weanalysis the question from the ways below:Piezoelectric ceramics chip is the core element of the piezoelectric vibrator. Firstof all, analysis its parameter, the work theory and property of mechanical energy andelectric energy’s conversion, give the equivalent circuit of piezoelectric ceramics, thepiezoelectric vibrator is composed by piezoelectric ceramics chip and berylliumbronze basal plate.Analysis the multi-chip piezoelectric vibrator’s property in the further, on thebasis of property of different resonance conditions and motivational patterns getthe support mode and inertance motivational patterns that apply to this paper, buildcantilever piezoelectric vibrator mode, get single-chip and double-chip’s piezoelectriccantilever electric charge and voltage expression. Traditional single-chip piezoelectric vibrator maybe appear chargeneutralization phenomenon because of ceramic chip’s area is large. To avoid thequestion of reducing electricity generation by charge neutralization, this paper buildmulti-chip that consist of4chips piezoelectric vibrator mode. Through inertanceharmonic motivation generate response and get its boundary conditions, get electricquantity’s expression. Build multi-chip piezoelectric cantilever dynamic mode,analysis differential vibration equation. On the base of cantilever boundary conditionsget characteristic value expression and natural mode of vibration. Build piezoelectricvibrator geometry constraint, get4feasible electrode link ways.On the base of building mode and theory analysis for the multi-chip piezoelectricvibrator mode, simulate and experiment for the multi-chip piezoelectric vibratorbroadband generation ability and electricity harvesting ability. Through combinationof ANSYS simulate and experiment data, get and compare the generation ability ofpiezoelectric ceramics chip in different position, though adding a mass to increasegeneration ability. Through analysis and compare data this paper chooses capacitor ascontainer. Through property analysis of the piezoelectric vibrator in differentinstallation on the rim. This paper chooses the installation of parallel to the rim.On the basis of theory analysis, design structure and installation of multi-chippiezoelectric generation device, especially design for the shell. It should have enoughinstallation space, and a small size as far as possible, and convenient to change the tire.This paper use2piezoelectric vibrator parallel connection, simulate the tire’s vibratefrequency of different speed, through vibrator give motivation that corresponding tofrequency under different speed. By analysis we get that motivation frequency toohigh or too low is not benefit to generate electricity, within limit increase frequency isbenefit to generate electricity. Because of the effect of the speed, the acceleration androad condition are very large. Through experiment measure the generating capacityunder different speed and different road condition, compare the datas we can knowincrease speed, the exist of acceleration and rough road condition are benefit togenerate energy.