基于低沸点化学物质的无源轿车轮胎温度监测系统

A Passive Car Tire Temperature Monitoring System Using Low-boiling Point Chemical Substance

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。系统中的胎温传感器将温度变化通过低沸点化学物质的饱和蒸汽压的相应变化转变为磁铁的位移信号,再利用线性霍尔传感器转变为电压信号,最后通过信号检测系统对信号进行处理和转换,实现对轮胎温度的实时监测和高温报警。通过静态实验,选定了满足胎温传感器要求的感温物质;通过动态实验,考察了报警系统的检测精确度。结果表明,系统检测相对误差绝对值≤6%,测温精度为1℃。

By utilizing the property of higher saturated vapor pressure of low-boiling point chemical substances, a passive car tire temperature monitoring system is designed, in which the change of temperature in tire temperature sensor is transformed into the displacement signal of magnet through the corresponding change in saturated vapor pressure of chemical substance. Then the displacement signal of magnet is transformed into voltage signal by linear Hall sensor, and through certain signal processing and transform, the real time monitoring and high temperature alarm of tire temperature are realized. The temperature sensing chemical substance meeting the requirements of tire temperature sensor are selected by static test, while the detection accuracy of warning system is investigated by dynamic test. The results show that the system achieves a relative error no more than 6% and a temperature measuring accuracy of 1℃.