Analysis And Design Of Pressure Monitoring System For The Vehicle Tires

With the improvement of people's quality of life, car sales are booming number of private cars into high-speed growth period. People have a car the same time, vehicle safety information, intelligence requirements are constantly improving. Tire Pressure Monitoring System TPMS (Tire Pressure Monitoring System) is mainly used for automatic vehicle tire pressure monitoring, when the leak occurred, and low tire pressure warning when such a state of insecurity, reminding drivers to take timely measures to avoid the cars in high-speed Driving in the process of tire failure, to prevent the sudden traffic accidents. The tire pressure is the tire normal prerequisite for normal work, the correct inflation pressure is to use a variety of conditions, give full play to the best guarantee of tire performance, and ensure that road safety and comfort, and to avoid abnormal wear and tear. A reasonable car tire pressure is not only one of the key elements of safe driving, but also can reduce fuel consumption, extend tire life.This paper introduces the TPMS system to produce the background, classification, basic characteristics; an overview of tire pressure monitoring systems at home and abroad overview of development; analysis of technical requirements and functions of TPMS; from the system with low power consumption and small size characteristics, etc. point of view, make the system overall design of the program.The design of the system functions according to select the appropriate hardware devices, and the selected chip performance, features, working principle and so do a specific description; and hardware circuit design, including the tire transmitter module and the central receiver module schematic Picture. One tire modules use an integrated chip and low-power technology to ensure the tire module small, light weight, small power requirements; right to conduct a theoretical analysis of the transmitting antenna is given antenna matching circuit and antenna design circuit; In the software design to take full advantage of the device characteristics of work in different states to make it as far as possible in a low-power state, the maximum extent possible to reduce the tire module power consumption; given tire test module and the central receiver module of the program design and other important function realization of the software flow chart. To ensure the system runs reliably and the system's interference, the right hardware and software aspects of the integrated design.Wireless transmission of data throughout the system design process is particularly important, their performance is good or bad will determine whether the driver in time from the state of real-time monitoring tire tires module status information they need. Therefore, this article associated with the wireless transmission of data encoding format, the data modulation and demodulation technology, wireless transmission, the transmission frequency is introduced. Determined in order to achieve the optimal data transfer encoding format and transmit power, allowing designers to meet the wireless data transmission on the basis of the distance as much as possible to improve data transmission reliability, lower error rate. System uses this design for the Manchester-encoded FSK modulated radio frequency communications programs, and Manchester encoding, FSK modulation and demodulation were introduced, allowing the system to ensure the transmission distance while increasing the reliability of data transmission.This paper has developed a vehicle tire pressure system can be in the car driving state of the tire temperature and pressure monitoring, in the tire pressure, temperature, alarm when abnormal. Its small size, working conditions and stability, able to adapt to poor working conditions, suitable for installation in the car tire. Can improve high-speed vehicle safety and reliability based on the development of TPMS has a high practical value. The system should be passive and small size, TPMS multi-functional, high integration, can be incorporated into the vehicle local area network to share information, etc. to be improved further to meet the development of new technologies in modern vehicles.