Estudo comparativo de sintonia de controle em chocadeira automatizada

Abstract

The present work proposes the development of a temperature controller for a marupá wood incubator using Arduino as a microcontroller. The controller adopted is based on PID closed-loop control, allowing temperature regulation according to different desired values (setpoints). The objective of the project is to build the incubator with temperature control by tuning controllers. For this, several materials were acquired, including sensors, stepper motor, cooler, PWM module, solid state relay, Arduino board, jumpers, lamps and LCD display. The MATLAB® software and the Simulink® tool were used to simulate and implement the PID control tunings, connecting them to the Arduino through the Arduino IO library, and to represent the connections of the components, the Fritzing software was used. From the open-loop step response, the first order transfer function representing the thermal system was obtained. Then, simulations were carried out of the tuning most used in the industry to choose the most suitable one for the proposed temperature control. The Ziegler-Nichols (ZN) and Integral Time Multiplied by the Absolute Error Value (ITAE) tuning showed promising results in the simulations, however, experimentally, they were not adequate. Thus, the traditional ON-OFF control was chosen, which obtained the best performance. This work presents the design of an incubator with temperature control through the tuning of PID controllers. However, due to the limitations found in the evaluated tunings, the ON-OFF control was adopted as a solution.