Technology Of Automobile Pressure Monitoring System Based On Zigbee

According to statistics, 60% of the highway in our country automobile traffic accident is caused by a flat tire, how to prevent tire blowout has become an important topic in today’s automotive safety driving. TPMS(Automobile tire pressure monitoring system) is safe and reliable, It can effectively prevent tire blowout safety device, this System can real-time automatic monitoring of type internal pressure,temperature, It will alarm the driver when temperature or pressure are off limits.Based on former experiences and according to some deficiencies, The design concept of the real-time tire monitor module grounded on Zigbee wireless network technology proposal is brought forward on some sufficient of pressure-sensor based on TPMS. Firstly, the significance of TPMS in the society and market and the importance of TPMS are depicted in the paper. At the same time, the features of Zigbee technology are introduced and its network with some advantages is elaborated,such as low consumption, low cost operation, high reliability and easily realization.Secondly, according to the technique index and function characteristic, the article introduces the basic theory of TPMS, proposes the overall design plan of system hardware. Appropriate protocols of star-network realization and low power management of the system are propounded in the article. Then, for practical application, some improvements are made on power design of the system’s software and hardware. Real-time wake-up in unusual condition would be integrated with regular wake-up in usual condition, which could reduce the send number of times and power of the monitoring module in the software. Low-power design in hardware is the election of high degree of integration of low-power chip, CC2430 and SP12 reduce the number of components and simplify circuit. The interference of the system is made further improvement. The direct-sequence spread-spectrum technology and signal collision avoidance system of Zigbee and rational design of PCB are used to the inter ference immunity of system. Compared to existing TPMS design, the improved design makes the system smaller, the circuit more simplified, less energy and longer service life while improving the system stability. Positioning technology isreliable, convenient and low-cost positioning technology. Zigbee binding mechanism is introduced, which can automatically update the binding list to achieve automatic positioning function after tire-change maintenance. The article analyses and designs the electric circuits of the tire and the host module. Correspondingly, thePCBs of two modules are fulfilled. The data communications between the tire module and the host module obeys the Zigbee wireless communication protocol.Based on the function of this system,we accomplished collection data of tire module and function of sending data; for the host module we finished the job of signal receive,saving and displaying. At last, we analysis the power which shows system can work in low power model.