The Design Of Tire Pressure Monitoring System Based On MSP430

After21st century, with the continuous development of industry standards and the accelerated process of globalization, convenient ways to travel have become more and more important. The car in people’s live has become more and more important too, and the car has become an indispensable means of transport. With the rapid increase in the booming automobile industry and car ownership, accident rates are also growing rapidly, and automobile safety has become one of the important factors that people serious considerate and the theme of current international automotive high-tech. In order to meet people’s needs, various security systems have come into being, such as ABS, ESP, TCS, etc. These electronic control systems are based on sensors that are distributed in various parts of the car. With these sensors we are able to achieve the understanding of the state of the automotive and accurate control. Therefore, application of new sensors and intelligent signal processing has apparently become one of the key areas of automotive safety.As an important and essential component of all types of car, tires transport the various forces and moments between cars and the road, and the state of the tires also determines the condition of the car and the safety of the driver and passengers. According to incomplete statistics, traffic accidents that occurred on the highways70%caused by a puncture in our country, and this proportion is as high as80%in the United States. Therefore, the tire problem has become truly "road killer". Especially in the hot summer, even if the driver regularly checks, tire accidents still occur frequently, and that can easily cause vehicle skidding and irregular tumbling because of preparation inadequate. Of all the car accidents, the drivers are most worried about the tire problem that is the most difficult to prevent. The sudden of the tire problem decides the importance in the field of automotive safety. Tire pressure monitoring system (TPMS) can real-time monitor tire pressure status, and alarm the driver, as a result of greatly increasing the driving safety. Therefore, TPMS has become one of the rapid development automotive active safety technologies.Since1880, the Curie brothers discovered the piezoelectric phenomenon in Jakes’s lab, more than100years has passed. The piezoelectric effect is that after the deformation occurs, the inside of some dielectric will generate charge polarization phenomena by an external force in a predetermined. The reaction of macroscopic phenomenon is that opposite charges will appear on the opposite surfaces. With the disappearance of external forces, it will return back to the uncharged state. With the widespread use of the piezoelectric effect, the new piezoelectric materials are also emerging out.This design belongs to the field of automotive electronic measurement, and is a set of feasible tire pressure monitoring system. The main idea is that we can describe the tire air-pressure state by the tire’s deformation that caused by the positive pressure between the tire and the ground. The deformation of the tire will be directly applied to the PVDF film. According to the piezoelectric characteristic of the PVDF, polarization charge will appear on its top and bottom surface, and then further processed by analog circuits and microprocessors, and send the piezoelectric signal to the instrument cluster via wireless transmission module. By this way, this system can allowed the driver to visually observed tire pressure situations, and achieve the real-time monitoring of the state of cars. The design is based on MSP430and PVDF as the core material, and an automotive active safety system that achieves the dynamic real-time monitoring of the state of cars and a power supply mode of the system by battery. This design has some practical value.