高温高压化学传感器检测校正平台温度控制技术研究

Temperature Control System of Experimental Platform for High Temperature-Pressure Chemical Sensor

对高温高压化学传感器检测校正平台的温度控制系统进行了分析,建立了系统优化的数学模型。该系统存在两级滞后,而且受到环境温度和反应釜内热液流速的干扰,普通PID控制不能及时对干扰产生抑制作用,而使控制系统出现较大超调,温度波动较大,控制系统的动态性能很差。而化学传感器检测校正需要的温度条件非常苛刻,对温度的控制精度要求极其严格,所以需要一种新的解决办法。介绍了一种对系统的两级滞后环节采用PID和双Smith预估反馈的方法。在系统MATLAB仿真和实际试验中得到了良好的效果,满足系统的精度要求。

Temperature control system of experimental platform for high temperaturepressure chemical sensor is analysed,and an optimization model of the system is established.Because of exiting two timedelay components,and being disturbed by ambient temperature and flow rate of the heat fluid in the reactor,general PID control can not cancel the disturbance timely,and lead to the large overshoot,and the fluctuation of temperature,and bad dynamic performance.The experimental platform for chemical sensor is stricted in the ambient temperature, so a new approach to control the temperature is needed.A method that PID and dual Smithpredictors are used to eliminate the timedelay is introduced.A good control results are obtained by this approach.