Design And Research Of Electrical Tire Pressure Monitoring System

With the improvement of living standard in our contry, the amount of automobiles increases rapidly, and the subsequent the auto-safe problems are becoming more prominent. During the high speed driving, the tires' troubles, which can be hardly prevented, are the drivers' chief worry, and these troubles are also the main factors of the sudden traffic accidents. So how to prevent tire explorations has become an important issue of safe driving, and it has drawn great attention of the related Departments in the recent years.Tire pressure monitoring system (TPMS), which is the life safeguard system of drivers and passengers, can monitor the tire' pressue and temperature and other parameters at real time, transmit the monitoring informations to microcontroller wirelessly, then alarm if tire is at low pressue or leaking to ensue the driving safety. After safe air pocket and ABS, TPMS is a new generation produc of auto safe in international auto field. TPMS is also a new research focus in autoelectronics.The research and development processes of a type of TPMS are presented wholely in this thesis. The TPMS's characters, development status and its trends are introduced firstly, the basic principles and structures of this system are discussed then. Considering the performance indices and function requirements of this TPMS, the overall scheme is put forward, and how to select the main chips of this system is also mentioned here. This whole system is decomposed into two parts: hardware section and software section, the designing ideas, methods and implements of this system are depicted respectively. In the hardware section, the performance of the main chips used in this system are induced in the first place, and then the schematic circuit diagrams and the sample PCB pictures are showed, at last several problems appeared during the design of RF circuits are simply discussed; In the software section, the communicaton protocols are included, and then the thoughts and menthods of the software design of TPMS' transmitter and receiver are described, in this section some actual software flowt charts and source codes are given. Finally, the debugging, testing methods of TPMS and related testing results are depicted.