Research And Application On RFID Reader Of TPMS Based On SAW Sensor

The performance of tire plays an important role of automobile's performance. Tire Pressure Monitoring System (TPMS) can monitor tire pressure real-time and guarantee the safety of automobile driving. However, the tire location and data measurement is a great challenge when vehicle is moving.The paper presents a reader based on Radio Frequency Identification (RFID) technology, which can locate the tire and read the data of pressure and temperature of the tire by communicating with the tag.The paper firstly introduces the development of the passive TPMS system and RFID technology and the research situation of domestic and oversea. Then the TPMS system based on SAW sensor and the theorem of RFID system is introduced. The protocol of UHF RFID ISO/IEC 18000-6 Type A, Type B and Type C is analyzed and compared. The design principle of embedded system, processor selection and the advantages and disadvantages of various embedded operating systems is presented. Finally, the chip of SAMSUNG S3C2440A and EOS of Windows CE is choosed to build the hardware and software platform of the reader.This paper focuses on the design, theorem and work process of the software and hardware of the reader. The whole hardware design based on S3C2440A and the circuit of each module is stated which include the minimum system of processor, reader module, display module, serial communication module, power module etc. The paper has completed the customization and migration of Windows CE embedded operating system and the design of application software based on Windows CE. RFID tag anti-collision algorithm–Binary-tree search algorithm and algorithm of backtracking based on Binary-tree search algorithm is analyzed in detail. The test of reading and writing RFID tag has been completed and the desired result is achieved.In the end, the work in the paper is summarized, and the future research of TPMS is discussed and prospected.