Eventos Anais de eventos
CONEM 2018
X Congresso Nacional de Engenharia Mecânica
INSTRUMENTAÇÃO E CONTROLE DE UM SISTEMA AUTOMÁTICO PARA INJEÇÃO DE FERTILIZANTES COM DISPOSITIVO VENTURI EM IRRIGAÇÃO LOCALIZADA
Submission Author:
Douglas Ruy S S Araujo , ES
Co-Authors:
Douglas Ruy S S Araujo, Rodrigo dos Santos Carolino Fiorido, Karoliny Eler Oliveira Santos, Lucas Marquardt, Michel de Oliveira dos Santos, Antônio Carlos Barbosa Zancanella
Presenter: Douglas Ruy S S Araujo
doi://10.26678/ABCM.CONEM2018.CON18-1243
Abstract
Traditionally, there are two ways of injecting fertilizers into the system. The Venturi injector is the solution that uses the own hydraulic energy of the system and the other would be the injection pumps. However, the small operational limit presented by the Venturi type fertilizer injector creates a great dependence on precise hydraulic parameters for efficient use in fertigation systems. This work aimed to build a bench for testing and testing focused on irrigation systems with fertilizer injection through this device and automate this process in the by-pass configuration. To do this, the bench was designed as a closed loop control system and the fertilizer injection process was automated by the use of an Arduino® ATmega2560 platform microcontroller and the motorization of a drawer valve. For this, this automatic system uses the PDI control to calculate the intensity of the control action that aims to correct the variations in the injection rate that occurred. Six tests were performed to verify the behavior of the system, the first being the system operated without the assistance of automatic control and the other, the intensity of the control action calculated by an equation with adjustable constants. The results obtained with the manual system indicated the need to automate the fertirrigation by Venturi. At the end of the first test, the injection rate was approximately 30% of the initial value. Already with the automation, it was possible to reach average values of injection rate equal to the desired value. In these last tests, the system presented variations in the flow of up to 38%
Keywords
Instrumentation, automatic control, fertigation, Venturi
