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The Design And Experiment Research On Piezoelectric Power Supply System For TPMS

Posted on:2011-10-11Degree:DoctorType:Dissertation
Country:ChinaCandidate:S W YanFull Text:PDF
GTID:1118360305453461Subject:Mechanical design and theory
Abstract/Summary:PDF Full Text Request
Tire Pressure Monitoring System (TPMS) is mainly used to monitor tire pressure in real-time when driving and to monitoring of on a flat tire and low pressure to alarm driver when meeting a flat tire or loss of air pressure in a tire and to ensure traffic safety, it is a security early warning systems. The mainstream of the TPMS in the market need battery-powered, but there are some unfavorable factors such as limited life and greatly affected by temperature, which reduce the reliability of TPMS. In addition, improper handling of used batteries will pollute the environment. Therefore, the passive of TPMS is the direction of development in the future, while the use of micro-power generatior alternative to battery powered TPMS into a viable technical solutions.Piezoelectric power generation device which is use of piezoelectric vibrator to harvest mechanical force to generate electrical energy is called micro-electricity generation device that is an important part and researching focus in micro-power generation , There are more than ten counties and regions all over the world in which there are the research institutions of piezoelectric power generation. With many merits such as simple structure, small body, no interfere of electromagnetism and easy to implement etc, it has broad application prospects in low-power radio frequency field.In order to solve the problem of the passive of TPMS, the influences of the composed elements of piezoelectric power generation system driving TPMS on its performance are studied in this paper, such as the PZT vibrator, additional mass block and piezoelectric vibrator installation , and so on.To solve the cantilever-type piezoelectric generating device with limited power output can not be drive TPMS directly, a micro-power power automatic adjustment circuit which can provide high current for TPMS intermittently is designed. To achieve high output ability of piezoelectric generating device, a piezoelectric power generation prototype which include multi-piezo-vibrators is presented and fabricated. And then, the relationships between external excitation conditions and the output performance are investigated theoretically and experimentally, finally the working performance of the piezoelectric power generation device connecting storage and control circuit is tested.The PZT vibrator is one of the most important element of piezoelectric power generation device, whose performance influences the output ability of piezoelectric power generation device directly. At first according to Hamilton's principle and relative knowledge of piezoelectricity , a cantilever-type piezoelectric oscillator of the mathematical model has been established, and then its equivalent electromechanical system model was found. Based on this, the relationship between structure parameter (Thickness ratio) as well as material parameter (Young's modulus ratio) of the PZT vibrator and performance parameters (including the resonant frequency, the energy conversion efficiency and energy output etc.) is figured out. The PZT vibrator designed based on the structure parameter and material parameter mentioned above has good comprehensive performance and can achieve the greatest energy conversion efficiency and output power for a piezoelectric power generation device with limited-body.A simplified model of piezoelectric power generation device has been established to analyze theoretically the main factors which include the influence of additional mass block and the installation of piezoelectric vibrator affecting the performance of piezoelectric power generation device, and then the result has been confirmed experimentally. The structural parameters and material properties of piezoelectric monomorph cantilever generator for TPMS are determined, and the quality of added-mass calculation as well as piezoelectric vibrator viable installation is given.Charge and discharge characteristics of th super-capacitor and the general capacitor of capacitor are studied theoretically and experimentally, and the general capacitor of capacitor is more suitable as a regular storage medium for piezoelectric power generation. The storage and control circuit which can provide intermittently high current output has been designed according to power generation characteristics of piezoelectric power generation and actual application.A piezoelectric power generation prototype which include multi-piezo-vibrators has been fabricated, and then the entire power supply system (piezoelectric power generation device and storage and control circuit) is tested. The results showed that speed and road conditions are the main external factors which affect the performance of piezoelectric power generation device, and the power supply system which is able to meet the work requirements of TPMS in a variety of speed(>25km/h) and road conditions is stable and reliable in addition to car just started a period of time (<5min) outside.
Keywords/Search Tags:Piezoelectric power generation device, Piezoelectric vibrator, TPMS, Model, Storage and control
PDF Full Text Request
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