Temperature and humidity control method of artificial climate box

The temperature and humidity control method of the artificial climate box The artificial climate box, like the light box, can provide a simulated natural environment, such as suitable temperature, humidity, illuminance, etc.
, for the growth of plants
.

In addition, the parameters of the artificial climate box can be set freely manually, eliminating the trouble of uncontrollable natural environment
.

Temperature and humidity control is an advantageous feature of the artificial climate box system.
At the same time of temperature and humidity control, we can use the temperature and humidity recorder to measure, and know the temperature and humidity changes in the artificial climate box at any time
.

When the temperature is low and heating, the water evaporates, and the moisture condensed in the climate box before cooling or dehumidification will evaporate and increase the internal humidity; When the humidity is low and humidified, the external cold or hot moisture will change the internal temperature, and when the humidity is high and dehumidification will inevitably lead to a drop in temperature
.

So the control of temperature and humidity is strongly coupled
.

Moreover, the degree of coupling between the temperature and humidity of the box of different specifications is not the same
.

In addition, sometimes the climate box requires multi-stage cyclic control of temperature and humidity, and the temperature and humidity of the front and rear sections are different, and the mathematical model of the temperature and humidity control of the climate box shows that they have a large delay and lag characteristics.
For the purpose of short and small overshoot, the general control method is difficult to work
.

It can be seen from the above analysis that the control of temperature and humidity of the artificial climate box is coupled with each other
.

In this way, the control of temperature and humidity is essentially a control problem of a large lag and strong coupling system
.

These characteristics determine the difficulty of obtaining higher precision for temperature and humidity control
.
Generally, the artificial climate box uses a separate temperature controller and humidity controller to achieve temperature and humidity control, and most of their control methods are PID control methods.
It is inconvenient, and the fuzzy controller does not depend on the mathematical model of the system, which avoids the trouble of identifying the system.
It has good robustness and adaptability, and is very suitable for control occasions such as model uncertainty and parameter changes.
, just can adapt to the temperature and humidity control of the artificial climate box, so the artificial climate box controller adopts the fuzzy control method to control the temperature and humidity of the air flow of the box, and also uses the fuzzy decoupling method to solve the problem of strong coupling between temperature and humidity
.