RELEVANCE OF USING CONTROL SYSTEMS BUILT ON THE BASIS OF A FUZZY LOGIC APPARATUS FOR CONDENSATION DRYING OF FRUIT AND VEGETABLE RAW MATERIALS USING THERMOELECTRIC HEAT PUMPS

A special problem in the field of automation is the control of objects whose functions are described by nonlinear dependencies. When designing control systems for nonlinear objects, methods such as linear approximation or piecewise linear approximation are usually used. However, the application of these methods in real technical devices does not always achieve the desired effect. Thus, in the presence of significant uncertainties in the static and dynamic characteristics of the drying chamber as a control object, it is difficult to formalize the tasks of synthesizing control system regulators. In this regard, the use of controllers based on fuzzy logic is appropriate (relevant). The main advantage of the fuzzy approach is the possibility of forming a number of control rules depending on the combination of values of the input variables of the controller and, consequently, on changes in the operating mode and the level of disturbances. In this paper, we have developed a model of an ATS with a fuzzy logic controller where the object for this case has nonlinear static characteristics. The development of the fuzzy logic controller is based on 5 rules of operation of the tabular representation. The membership functions of fuzzy sets have been defined. The fuzzy output algorithm was chosen as Sugeno of order 0. According to the characteristics of the fuzzy controller, the initial data for the formation and study of the neural network were determined, for further use as a neuro-regulator. The modeling resulted in the transient processes of the ACS with a fuzzy logic controller and a traditional PID controller. The use of a control system built on the basis of a fuzzy logic apparatus for a condensing dryer using thermoelectric heat pumps is possible when using incomplete information on the mathematical description, or the control object is not stationary.