新型平板式汽车氧传感器的结构设计与数值模拟

Structure Design and Numerical Simulation of Novel Planar Automobile Oxygen Sensor

设计了利用铈基储氧材料作为固态储氧参比层的新型平板式浓差型汽车氧传感器的多层结构,采用APDL建立其参数化有限元模型,通过热传导分析,对加热器进行优化设计。对优化模型施加阶跃电压,通过对电热耦合场模拟显示:t=4 s时,传感器活性区域温度均达到工作温度(300℃)以上,t=63 s时,各层温度趋于稳定,其中t=5 s时,各层温度梯度最大。热力耦合结果显示:各层最大等效应力先增大再缩小,最后趋于稳定,在t=5 s时,各层热应力值最大,但均小于相应温度下的断裂强度。

The multilayered structure of a novel planar potentiometric oxygen sensor was designed by employing the cerium oxide-based solid-state storage material as the solid-state reference.The parameterized finite element model was established by using APDL.Through the heat transfer analysis,the heater design was optimized.A step voltage to the optimization model was loaded,the electrothermal coupled analysis shows that the active area of the sensor reached working temperature above 300 ℃ at t = 4s,each layer temperature tends to be stable at t = 63 s and appears maximum temperature gradient at t = 5 s.The result of thermo mechanical coupled shows that the maximum equivalent stress of each layer increases at first then decreases,finally tends to be stable,the maximum value appears at t = 5 s and which is less than the fracture strength at the corresponding temperature.