【摘要】 汽车轮胎压力监测系统(TPMS)的主要技术难点是无线通信的可靠性和稳定性,以及如何延长发射端工作电池的使用寿命。针对这些技术难点,该文对低功耗发射器电路和接收器电路进行了研究和设计。对TPMS发射和接收天线辐射电阻、损耗电阻和电感等参数进行了分析,并根据这些参数设计出匹配网络,提高低功耗电路的发射效率。分析了因车轮高速运动引起的多径衰落和Doppler频移对接收信号和性能的影响,以及如何通过改变软件的编码格式和通讯协议来克服,从而研制出一种全新有效而且稳定可靠的TPMS通讯系统与天线。其整体性能在静态﹑动态和实际装车运行测试中达到了很好的效果,超过了TPMS相关国际标准的要求。更多还原

【Abstract】 The main technical difficulties in tire pressure monitoring systems(TPMS) are the reliability and stability of the wireless communications and how to prolong the battery lifetime for the pressure sensor transmissions.These technical difficulties are addressed with low power transmission and receiving circuits.The transmission and radiation resistance characteristics of the receiving antenna,the loss resistance,and the inductance were analyzed with network matching to improve the transmitting efficiency of the low power circuits.The influence on the receiving signal sensitivity and performance related to multipath fading and the Doppler shift caused by the high speed wheel movement were analyzed with a new communication algorithm developed to optimize the system.An effective and reliable antenna scheme was developed with an improved communications protocol.Its overall performance for the static,dynamic,and actual loading effects on vehicles is satisfactory and exceeds the requirements for the international TPMS standard.更多还原