Multi-loop fuzzy coupling temperature and humidity controller suitable for constant temperature and humidity experiment box

Abstract

The invention provides a multi-loop fuzzy coupling temperature and humidity controller suitable for a constant temperature and humidity experiment box. Compared with the traditional temperature and humidity controller for the constant temperature and humidity experiment box, the controller has a distributed structure mode; independent acquisition circuits are adopted in temperature and humidity control respectively; coupled calculation of temperature and humidity parameters is performed in a bus communication-based mode; algorithms and realization modes of fuzzy rules comprising parameter fuzzification, fuzzy rule reasoning, parameter defuzzification and the like are introduced; membership degrees of transition temperature and humidity input values are calculated according to temperature and humidity reference input and feedback signals and a membership function of a temperature and humidity input fuzzy set; and meanwhile, a compounding proportion integration differentiation (PID) control function of temperature and humidity is called on the basis of a coupling model of temperature and humidity, and the proportion coefficient, the integration coefficient and the differentiation coefficient of a temperature and humidity PID controller are calculated and used as references of the current controller for controlling the temperature and the humidity. By practical application of the multi-loop fuzzy coupling temperature and humidity controller for the constant temperature and humidity experiment box, the control effect on the temperature and the humidity of the constant temperature and humidity experiment box can be effectively realized, the constant temperature and humidity requirements of the experiment box are met, the stabilities of the temperature and the humidity are higher than those of the traditional temperature and humidity controller, and the temperature index and the quality of the constant temperature and humidity experiment box are improved.

Description

technical field [0001] The present invention relates to the application function research in the process of temperature and humidity control in the field of industrial control and laboratory application. After referring to the traditional PID control, the algorithm and implementation method of fuzzy rules are introduced to design a multi-loop suitable for constant temperature and humidity experiment box. The fuzzy coupling temperature and humidity controller can effectively realize the control effect of the temperature and humidity of the constant temperature and humidity test box, and meet the requirements of constant temperature and humidity of the test box. The stability of temperature and humidity is higher than that of the traditional temperature and humidity controller, which improves the constant temperature and humidity. Humidity chamber temperature index and quality. Background technique [0002] The constant temperature and humidity test box mainly provides test en...

AI Technical Summary

Problems solved by technology

[0004] Usually, the control system of the constant temperature and humidity box performs PID control on the control of the refrigeration system and the heating system respectively or there is a small correlation between them, so the control effect is often not ideal, and it is difficult to achieve stability in temperature or humidity control. The nearby fluctuations are large, especially for some special areas such as high temperature and high humidity, the control effect will be worse

Images