Automation of temperature control of a heat generator with a fuzzy logic controller

Abstract

Purpose. Improving the quality of temperature control of a heat generating installation for air heating. Methods. The specificity of the issue under consideration determines the analytical method of research by formulating a mathematical model of the non-stationary thermal regime of the heat generator and calculating the parameters of the temperature controller based on fuzzy logic. Results. Analysis of the thermal effects of a heat generator with a heat exchanger, a physical model is determined and, on its basis, a mathematical model of non-stationary heat transfer in the elements of the heat generator design is formulated. The model is presented in the form of three partial differential equations. An approximate solution of the system of equations and generalized simplifications made it possible to determine the dynamic model by means of first-order aperiodic transfer functions with delay. Based on the identified model coefficients, a fuzzy controller rule base and an automatic temperature control system were created in two versions: with a typical PID controller and a fuzzy temperature controller. The analysis of transient processes of regulation of the automatic temperature control system was carried out. Conclusions. An analysis of the characteristics of the transient process of the automatic temperature control system revealed that the control time of a system with a fuzzy controller is less than in a system with a typical PID controller. Therefore, a fuzzy air temperature control system in a heat generator can be used to automate a significant class of heat generating devices. Keywords: heat generator, fuzzy controller, dynamic mode, mathematical model, production room.