汽车轮胎压力监测系统中的动态天线研究

由于汽车轮胎压力监测系统(TPMS)中的无线温度压力传感器安装在轮毂上,金属的轮毂、车身以及轮毂的转动对无线传感器天线的性能影响很大,使TPMS的性能下降。针对该问题提出将无线传感器天线、轮毂、车身看作一个动态天线,建立动态天线的三维电磁场仿真模型,并将仿真得到的动态天线参数用于无线传感器天线的匹配电路设计。道路试验显示:设计的TPMS系统安装在汽车轮毂上且处于运动状态时,性能良好,说明动态天线的三维电磁场仿真模型可用于TPMS的优化设计。

A Study on Dynamic Antenna in Tyre Pressure Monitor System of Vehicles

As the wireless sensor in tyre pressure monitor system (TPMS) is mounted on the wheel, the metal parts of the wheels and vehicle body and the rotation of wheel strongly affect the performance of the antenna with wireless sensor and hence degrade the performance of TPMS. To solve the problem, a concept of dynamic antenna is introduced, which comprises the antenna with wireless sensor, wheels, and vehicle body. A 3D electromagnetic simulation model for the dynamic antenna is built and a simulation is performed. The parameters of dynamic antenna obtained by the simulation are then used in the design of matching circuit of base antenna. The results of field test show that the TPMS with new design of antenna has a good performance even when the vehicle is moving at high speed. This indicates that the concept of dynamic antenna and its electromagnetic simulation model are feasible and conducive to the rational design of the antenna for TPMS.