Tire Pressure Monitoring System Design And No-battery Research

TPMS May carries on the monitor to the tire barometric pressure and the temperature, guaranteed the tire work in the standard barometric pressure and the temperature range, may enhance the automobile obviously the actuation, smoothness, the stability and comfortableness;And may prevent the blowout, reduces burst characteristics traffic accident occurrence which causes because of the blowout, this to enhances the automobile the security to have the vital role. After many years development, TPMS develops by the original mechanical type for the present electronic formula. This article tells about the application of a sensor technology, micro-electronics technology and RF communication technology to achieve high-tech TPMS program. Passive TPMS focus on the development and trend of piezoelectric driven program generating an initial theoretical and experimental study.The article introduced the TPMS system composition, the hardware architecture and the software method of exploitation as well as in the passive experimental study development concrete work in detail. Include the following elements:一. IntroductionThe tire in the automobile travel is the important part, how prevented the blowout has become the safe driving an important topic, the research indicated, the maintenance standard tire barometric pressure travel and the prompt discovery tire air leakage is prevents the blowout the key. Thus it can be seen, has the necessity very much carries on the monitor to the tire barometric pressure and the temperature. TPMS (Tire Pressure Monitoring System) then arises at the historic moment under this demand. Introduced the topic background as well as the TPMS development present situation and the tendency, have summarized the TPMS system composition, finally has outlined this article main research content.二. Overall plan designIn the small volume, the low power loss as well as redundant reliable and so on the system specification and the centrifugal acceleration, the weight, the tire transient equilibrium as well as the high temperature and so on affect TPMS under the environment and the factor, has determined the system realization plan. The system divides into the launch module and the receive module, has determined in the system the hardware concrete model, including sensor, radio frequency wireless correspondence and micro controller and so on chips.三. System software and hardware designIn the launch module hardware design, uses the SP12 digital pressure transmitter to carry on in the tire the barometric pressure and temperature data gathering, selects LPC932 to carry on the control, realizes the data acquisition, the data temporarily stores with the radio frequency data transmission. In the receive module uses the liquid-crystal display (LCD) present in figures and diagrams to demonstrate each tire the condition information, and has the unusual situation in the signal, and have the corresponding acoustooptics to report to the police. In the system the wireless correspondence reliability is extremely important, multi-analysis radio frequency receiving and dispatching chip nRF905 hardware principle, disposition method, working, radio frequency receive and launch work flow. And introduced the software design flow, has summarized the nRF905 CRC verification algorithm principle and the software simulation realizes the SPI connection correspondence, between very good solution LPC932 and nRF905 correspondence question.四. The installation and testing of systemsThe TPMS launch module installment fixes on the wheel felloe, in order to does not affect the original wheel the transient equilibrium, the tight screw and the launcher are symmetrical, weight match. According to the free-space propagation wireless signal distance computational method, calculated the nRF905 theory signal distance. And has carried on the signal distance actual survey, obtained the practical application signal distance. Estimates of the launched module for working life, according to the actual work of current consumption and battery capacity. calculation module working life has been launched in three and a half years and meet the requirements of the design and practical use.五. Based on piezoelectricity ceramics electricity generation of research passive TPMSDirect-like TPMS use battery existence very many malpractices, and TPMS passive will also be the future development direction, this article of a piezoelectricity electricity generation actuation plan in view of TPMS passive realization plans has conducted the preliminary study. Therefore, has designed the piezoelectricity power generation capacity test system, has carried on the test to the piezoelectricity power generation capacity. And has designed the energy conversion and the storage circuit, has carried on the preliminary experimental test under the laboratory condition, designs the piezoelectricity power generation actuation unit may be the TPMS launch module power supply, but is away from the actual application also to have very works, need more further research work.六. Conclusion and OutlookThe main conclusions are given a full and in-depth study as the next step.