低沸点化学物质在无源轿车轮胎温度传感器中的应用

Application of Low-boiling Point Chemicals in Car Tire's Passive Temperature Sensor

利用低沸点化学物质具有较高的饱和蒸汽压的特性,设计了一种无源轿车轮胎温度监测系统。系统中的温度传感器是将温度变化通过低沸点化学物质的饱和蒸汽压信号转变为磁铁的位移信号,再利用线性霍尔传感器检测位移信号,实现对轮胎内温度的实时监测。低沸点化学物质是温度传感器的核心之一,结合轮胎温度报警的实际条件,通过考察不同低沸点物质的饱和蒸汽压随温度和压力的变化规律,并考虑化学物质使用的安全性,最终确定了该温度传感器中所适用的感温物质。

Considering the fact that low-boiling point chemical substance has higher saturated steam pressure, a car tire＇ s temperature monitoring system was designed to have tire＇ s temperature change translated to the magnet displacement signals through saturated steam pressure change of low-boiling point chemical substance in temperature sensor, and then to have the displacement signals detected with liner Hall element and the tire temperature monitored in real time. The low-boiling point chemical substance means important to the tempera- ture sensor, having the rules that saturated steam pressure of different low-boiling point chemicals varies with temperature and pressure studied, and the conditions of tire temperature alarm and chemical substance security considered, the best temperature sensitive substance for passive temperature sensor was determined.