恒温瓦斯检测模型动态分析及控制

恒温检测是通过控制检测元件中的电流达到控制元件工作温度的目的.检测电流会随着温度的波动而波动,普通恒温检测电路通过闭环控制需要经过很长时间才能达到稳定.为解决长时间振荡问题,在恒温瓦斯检测原理及载体催化元件性能分析的基础上,建立了恒温瓦斯检测的数学模型并设计出一种PID控制器.其控制效果明显好于闭环控制.仿真及实验结果表明,带PID控制器的恒温瓦斯检测系统只需3 s便能检测出瓦斯浓度,其稳定性和快速性明显优于一般恒温瓦斯检测系统.

Thermostatic Methane Detection Model Dynamic Analysis and Control

The aim of thermostatic detection is to control the current injected to Pt resistor to obtain the required operating temperature. Detecting current fluctuates with temperature, and general thermostatic detecting circuit needs a long time to achieve stability with close loop control. In order to solve this problem, we established a thermostatic detecting mathematical model and designed a PID controller based on the analysis of catalyst element performance and principle of thermostatic methane detecting. Compared it to the closed loop control, and we found it better. The simulation result shows that the thermostatic methane detecting with PID controller only needs 3s to determine the methane concentration, and it is superior to the general thermostatic detecting system in stability and rapidness.