基于前馈解耦的婴儿培养箱温湿度控制系统

Temperature and humidity control system of infant incubator based on feedforward decoupling

目的针对婴儿培养箱温湿度控制系统存在的时滞、强耦合问题,本文在传统PID控制技术的基础上,提出了前馈补偿控制方案。方法首先通过对恒温恒湿控制系统的深入研究,采用阶跃响应法建立耦合系统模型来提高控制模型的准确性和控制精度;然后在控制系统中加入前馈解耦控制器,使原本相互耦合的温度、湿度变量等效为两个独立的温湿度控制子系统;最后,在设定起始环境温度为28℃、起始环境湿度为60.9%的前提下,分别应用本文设计的带有前馈解耦补偿的PID控制方案与传统PID控制方案对温湿度进行MATLAB仿真实验。结果应用前馈解耦的PID控制方案对温湿度的调节时间分别为1878s、1210s,超调量几乎为0,抗干扰峰值均有所降低,响应结果远远优于传统PID控制。结论采用本文提出的方法,不仅可以排除温湿度控制之间的耦合性,还可以加快温湿度控制的响应速度,增强系统的适用性。

Objective In order to solve the problem of time delay and strong coupling in the temperature and humidity control system of infant incubator, this paper proposes a feedforward compensation control scheme based on the traditional PID control technology. Methods Firstly, through the in-depth study of the constant temperature and humidity control system, the step response method is used to establish the coupling system model to improve the accuracy and control accuracy of the control model. Then the feed-forward decoupling controller is added into the control system to make the previously coupled temperature and humidity variables equivalent to two independent temperature and humidity control subsystems.Finally, under the premise of setting the initial ambient temperature to 28 ℃ and the initial ambient humidity to 60.9%, the PID control scheme with feedforward decoupling compensation designed in this paper and the traditional PID control scheme are applied to the temperature and humidity on the MATLAB simulation results. Results The feedforward decoupling PID control scheme is applied to adjust the temperature and humidity for 1878 s and 1210 s respectively, the overdose is almost zero, the anti-interference peak value is reduced, and the response result is far better than the traditional PID control. Conclusions The method proposed in this paper can not only eliminate the coupling between temperature and humidity control, but also accelerate the response speed of temperature and humidity control and enhance the applicability of the system.