Claudio Umezu - Academia.edu (original) (raw)
Papers by Claudio Umezu
Engenharia Agricola, 2000
Central theme, technology for all: sharing the knowledge for development. Proceedings of the International Conference of Agricultural Engineering, XXXVII Brazilian Congress of Agricultural Engineering, International Livestock Environment Symposium - ILES VIII, Iguassu Falls City, Brazil, 31st Aug..., 2008
Acta horticulturae, Nov 1, 2010
A fixed bed dryer was dimensioned, built and implemented in this work aiming at drying 50 kg of g... more A fixed bed dryer was dimensioned, built and implemented in this work aiming at drying 50 kg of grains from 25% initial moisture content down to a final 13%, with emphasis on energy saving and product quality. A set of finned electric resistors (1,800 W) was installed for air heating in a range of 50 to 70°C. Air temperature and humidity were measured using Pt 100 resistance temperature detectors and resistive sensors positioned at diverse places of the drying bed. A supervisory application for the drying process was developed using the LabView software with the goal of enabling control of the potency of the electric resistors and ventilator motor, in order to regulate the drying air temperature and airflow ratio. This supervisory application was named CONT/DRY-1. The LabView uses graphical programming language based on virtual instruments. The set point value can be altered on the front panel by specifying the upper and lower temperature limits. Hence, the proportional-integral-derivative controller (PID) operates with varied increments accordingly to the predetermined temperature and drying kinetic ranges. The CONT/DRY-1 allows real-time monitoring of air temperature and humidity at various sites of the drying bed. In addition, it allows estimates of massive airflow ratios, engine rotation and energy consumption. The data are visualized as graphics, and accessed by means of an interactive man-machine graphical interface, which enables the operator to supervise, analyze and interact with the data. The results of the present work demonstrated the suitability and efficiency of the proposed CONT/DRY-1 supervisory system for a real time computational control of the fixed bed grain drying process.
This paper addresses the problem of /spl Hscr//sub 2/ control of uncertain discrete-time systems ... more This paper addresses the problem of /spl Hscr//sub 2/ control of uncertain discrete-time systems with regional pole constraints. All quadratic stabilizing state feedback controllers can be mapped into a convex set. By imposing on the elements of this set additional convex constraints, the associated control gain obtained guarantees a specific pole location to the closed-loop uncertain system. A convex optimization procedure is then used in order to minimize an upper bound of the /spl Hscr//sub 2/ norm of the controlled systems, providing thus an /spl Hscr//sub 2/ guaranteed cost control with regional pole constraints.<<ETX>>
Sensors, Jan 24, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
CONTRIBUCIONES A LAS CIENCIAS SOCIALES
Mechanization is essential to achieve better efficiency agricultural production systems, contribu... more Mechanization is essential to achieve better efficiency agricultural production systems, contributing significantly to rural development. Utilization of agricultural machinery by family farmers allows them to achieve greater productivity, improving the quality of life. However, true quality of life is only likely to be reached when technological advancements are consistent with truly sustainable development. This article aims to analyze whether the current cutting-edge mechanization systems for sugarcane applicable for family farming achieve objectives 2,5,8,9,10,12 and 13 of the Sustainable Development Goals (SDGs). A systematic review of the literature was performed that revealed 31 representative articles that depicted advancements relevant to mechanisation of family farming production systems for sugarcane . These articles were analyzed in an organized way to assess the contribution of agricultural machinery and implements to achieving the SDGs. A comprehensive assessment was ca...
This work describes the construction, calibration and tests of a Low Cost Electronic Push Cone (L... more This work describes the construction, calibration and tests of a Low Cost Electronic Push Cone (LCPC) for the study of mechanical impedance to root growth and plant emergence. The LCPC may be used to determine Cone Index up to a 40 mm depth. The LCPC developed is made up of three parts: mechanical device, electronic circuit and software. The mechanical part is composed, basically, of an aluminium body that shelters a cone. The force for penetration in the soil is supplied by a spring of linear characteristic. The electronic part consists of a displacement sensor that is used to measure the spring's displacement. An electronic circuit makes the interface of the signal with a microcomputer. The software has the function of controlling the acquisition, storage and processing of the data. The LCPC presented good results in the calibration and in the field tests.Este trabalho descreve a construção, a calibração e os testes de um Push Cone Eletrônico de baixo custo, para utilização em...
Engenharia Agrícola, 2011
A água é um recurso cada vez mais escasso e também de alto custo em várias regiões. O beneficiame... more A água é um recurso cada vez mais escasso e também de alto custo em várias regiões. O beneficiamento de frutas e hortaliças, em geral, apresenta elevado consumo de água durante o processo de limpeza. A linha de beneficiamento e de classificação do tomate de mesa é constituída de: recebimento, limpeza, seleção, classificação e embalagem. Normalmente, o recebimento dos tomates em uma linha de beneficiamento ocorre com taxa de alimentação constante, porém com interrupções frequentes dos operadores, ocasionando desperdício de energia e água, e a eficiência de limpeza dos frutos. O objetivo deste trabalho foi avaliar um sistema de limpeza dos frutos, equipado com um controle automático de fluxo de água, visando ao uso racional de água. Para a avaliação da eficiência do processo de limpeza, aplicou-se uma metodologia que utiliza o turbidímetro. Observou-se que o índice de limpeza foi, segundo critérios estatísticos, semelhante nos sistemas automatizado e tradicional, todavia o consumo de ...
SSRN Electronic Journal
So that the levels of water stress are not harmful to the development of the crop and affect its ... more So that the levels of water stress are not harmful to the development of the crop and affect its productivity, its detection and monitoring are necessary, and it can occur in different ways. One of them is through the Crop Water Stress Index (CWSI). This index quantifies water stress through the normalization of leaf temperature between the maximum and minimum plant temperatures as a function of evaporation conditions. The responses of a low-cost infrared (IR) sensor were crossed with image processing through segmentation by the Excess Green model to develop a water stress detection system using CWSI. A soil/plant temperature map was generated through a point-to-point scan of the IR sensor. And when it overlaid with a segmented image of the experimental area, only points identified as plants had their temperature values maintained. The Non-Water-Stressed Baseline (NWSB) equation was parameterized for the same conditions of the experiment and external environmental. The experimental area was divided into three different treatments, maintained under stable water conditions throughout the experiment and the system was able to identify stably different stress values between treatments. Although the relationship between crop and environment affected the results, this work showed that using an irrigation system based on CWSI is possible.
Modern agriculture searches for new technologies for application of nutrients with higher precisi... more Modern agriculture searches for new technologies for application of nutrients with higher precision to increase productivity, minimize environment impact, reduce production costs and improve products quality. The development of such machines tends towards automation and the introduction of embed electronic systems. The aim of this work was the development of an Interface Module (MDI) to be used in a system for application of liquid products. The function of the MDI is to receive the information from the Control Module, reading the field sensors, process all this data and command the peripherals involved in the application, as: pumps, electro-valves for flux of nutrients control. The results of the analysis have shown that the MDI presented a superior performance than the required by the application system of liquid nutrients.
Agricultural mechanization is an area of knowledge that has evolved a lot over the past century, ... more Agricultural mechanization is an area of knowledge that has evolved a lot over the past century, its main actors being agricultural tractors that, in 100 years, have increased their powers by 3,300%. This evolution has resulted in an exponential increase in the field capacity of such machines. However, it has also generated negative results such as excessive consumption of fossil fuel, excessive weight on the soil, very high operating costs, and millionaire acquisition value. This paper aims to present an antiparadigmatic alternative in this area. It is proposing a swarm of small electric robotic tractors that together have the same field capacity as a large tractor with an internal combustion engine. A comparison of costs and field capacity between a 270 kW tractor and a swarm of ten swarm tractors of 24 kW each was carried out. The result demonstrated a wide advantage for the small robot team. It was also proposed the preliminary design of an electric swarm robot tractor. Finally,...
Engenharia Agrícola, 2006
O presente trabalho teve o objetivo de desenvolver uma servoválvula de baixo custo, que respondes... more O presente trabalho teve o objetivo de desenvolver uma servoválvula de baixo custo, que respondesse a um sinal eletrônico de controle, para a aplicação de insumos líquidos a taxas variáveis. Depois de realizada pesquisa na literatura das opções de válvulas existentes para a dosagem de líquidos a baixas pressões, partiu-se para o desenvolvimento de uma válvula proporcional com acionamento mecânico por intermédio de um servomotor controlado eletronicamente. Uma vez desenvolvida a servoválvula, o sistema foi submetido a um conjunto de testes, realizados em bancada desenvolvida especificamente para esse fim, onde se procurou avaliar seu comportamento em termos de repetitividade, histerese e linearidade. Como resultados, obtiveram-se três curvas de vazão em função do percentual de abertura, descrevendo três incrementos de abertura e fechamento em duas pressões diferentes de trabalho. A servoválvula apresentou boa repetitividade, razoável histerese e curva tipicamente quadrática, bem como...
Revista Brasileira de Engenharia Agrícola e Ambiental, 2002
O presente trabalho relata o desenvolvimento de um penetrógrafo, construído para operar de forma ... more O presente trabalho relata o desenvolvimento de um penetrógrafo, construído para operar de forma automática, executando um ensaio de penetração com um simples toque no botão de partida. Ele possui incorporado, um sistema dedicado de aquisição de dados, que pode armazenar até 187 ensaios e uma interface de comunicação, dispensando a conexão ao microcomputador ou "datalogger". As condições do ensaio como, por exemplo, data, localização (latitude e longitude) e profundidade, podem ser atualizadas, assim como a aferição da célula de carga, via teclado com mostrador de duas linhas. Verificou-se variação de velocidade < 5% com relação à do padrão ASAE, para índices de cone entre 500 e 5.684 kPa. O equipamento é compacto, de fácil manuseio e com capacidade operacional de até um ensaio por minuto.
Revista Brasileira de Engenharia Agrícola e Ambiental, 2001
Este trabalho descreve a construção, a calibração e os testes de um Push Cone Eletrônico de baixo... more Este trabalho descreve a construção, a calibração e os testes de um Push Cone Eletrônico de baixo custo, para utilização em estudos da resistência mecânica à emergência e ao desenvolvimento das raízes das plantas. O equipamento pode ser usado para determinar Índice de Cone até 40 mm de profundidade. O push cone desenvolvido é constituído de três partes: dispositivo mecânico, circuito eletrônico e software. A parte mecânica é composta, basicamente, de um corpo confeccionado em alumínio, que abriga um cone cuja força para penetração no solo é suprida por uma mola de característica linear; a parte eletrônica é formada por um sensor de deslocamento, utilizado para medir a deflexão da mola, além de um circuito eletrônico, que faz o interfaceamento do sinal do sensor de deslocamento com um microcomputador; o software, tem a função de controlar a aquisição, o armazenamento e o processamento dos dados. O equipamento apresentou bons resultados na calibração e nos testes de campo.
Engenharia Agrícola, 2014
The present study shows the development, simulation and actual implementation of a closed-loop co... more The present study shows the development, simulation and actual implementation of a closed-loop controller based on fuzzy logic that is able to regulate and standardize the mass flow of a helical fertilizer applicator. The control algorithm was developed using MATLAB's Fuzzy Logic Toolbox. Both open and closed-loop simulations of the controller were performed in MATLAB's Simulink environment. The instantaneous deviation of the mass flow from the set point (SP), its derivative, the equipment´s translation velocity and acceleration were all used as input signals for the controller, whereas the voltage of the applicator's DC electric motor (DCEM) was driven by the controller as output signal. Calibration and validation of the rules and membership functions of the fuzzy logic were accomplished in the computer simulation phase, taking into account the system's response to SP changes. The mass flow variation coefficient, measured in experimental tests, ranged from 6.32 to 1...
Revista Brasileira de Engenharia Agrícola e Ambiental, 2010
A produção em ambientes protegidos é uma técnica por meio da qual se objetiva proteger flores e h... more A produção em ambientes protegidos é uma técnica por meio da qual se objetiva proteger flores e hortaliças contra a ação dos elementos meteorológicos que a afetam, além de permitir ambientes favoráveis de produção durante todo o ano, com vantagens produtivas e comerciais. Um fator importante da produção em estufas é o controle da temperaturae da umidade relativa do ar. A automação do controle do ambiente possibilita o aumento da qualidade dos produtos, maior eficiência e uso racional dos recursos. O objetivo do presente trabalho foi desenvolver um sistema de controle de temperatura e umidade relativa do ar para o protótipo de uma ambiente protegido em escala reduzida, utilizando-se dos conceitos da lógica Fuzzy. As variáveis de entrada foram a temperatura e a umidade do ar e as variáveis de saída foram as atuações nos sistemas de aquecimento e de umidificação do ambiente. O processo de controle do ambiente foi simulado e os parâmetros do projeto foram ajustados. Os resultados obtidos na simulação demonstraram que os ajustes das variáveis Tar e UR, baseados no sistema de inferência Fuzzy desenvolvido, foram satisfatórios para o desempenho do sistema de controle do ambiente protegido.
Engenharia Agricola, 2000
Central theme, technology for all: sharing the knowledge for development. Proceedings of the International Conference of Agricultural Engineering, XXXVII Brazilian Congress of Agricultural Engineering, International Livestock Environment Symposium - ILES VIII, Iguassu Falls City, Brazil, 31st Aug..., 2008
Acta horticulturae, Nov 1, 2010
A fixed bed dryer was dimensioned, built and implemented in this work aiming at drying 50 kg of g... more A fixed bed dryer was dimensioned, built and implemented in this work aiming at drying 50 kg of grains from 25% initial moisture content down to a final 13%, with emphasis on energy saving and product quality. A set of finned electric resistors (1,800 W) was installed for air heating in a range of 50 to 70°C. Air temperature and humidity were measured using Pt 100 resistance temperature detectors and resistive sensors positioned at diverse places of the drying bed. A supervisory application for the drying process was developed using the LabView software with the goal of enabling control of the potency of the electric resistors and ventilator motor, in order to regulate the drying air temperature and airflow ratio. This supervisory application was named CONT/DRY-1. The LabView uses graphical programming language based on virtual instruments. The set point value can be altered on the front panel by specifying the upper and lower temperature limits. Hence, the proportional-integral-derivative controller (PID) operates with varied increments accordingly to the predetermined temperature and drying kinetic ranges. The CONT/DRY-1 allows real-time monitoring of air temperature and humidity at various sites of the drying bed. In addition, it allows estimates of massive airflow ratios, engine rotation and energy consumption. The data are visualized as graphics, and accessed by means of an interactive man-machine graphical interface, which enables the operator to supervise, analyze and interact with the data. The results of the present work demonstrated the suitability and efficiency of the proposed CONT/DRY-1 supervisory system for a real time computational control of the fixed bed grain drying process.
This paper addresses the problem of /spl Hscr//sub 2/ control of uncertain discrete-time systems ... more This paper addresses the problem of /spl Hscr//sub 2/ control of uncertain discrete-time systems with regional pole constraints. All quadratic stabilizing state feedback controllers can be mapped into a convex set. By imposing on the elements of this set additional convex constraints, the associated control gain obtained guarantees a specific pole location to the closed-loop uncertain system. A convex optimization procedure is then used in order to minimize an upper bound of the /spl Hscr//sub 2/ norm of the controlled systems, providing thus an /spl Hscr//sub 2/ guaranteed cost control with regional pole constraints.<<ETX>>
Sensors, Jan 24, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
CONTRIBUCIONES A LAS CIENCIAS SOCIALES
Mechanization is essential to achieve better efficiency agricultural production systems, contribu... more Mechanization is essential to achieve better efficiency agricultural production systems, contributing significantly to rural development. Utilization of agricultural machinery by family farmers allows them to achieve greater productivity, improving the quality of life. However, true quality of life is only likely to be reached when technological advancements are consistent with truly sustainable development. This article aims to analyze whether the current cutting-edge mechanization systems for sugarcane applicable for family farming achieve objectives 2,5,8,9,10,12 and 13 of the Sustainable Development Goals (SDGs). A systematic review of the literature was performed that revealed 31 representative articles that depicted advancements relevant to mechanisation of family farming production systems for sugarcane . These articles were analyzed in an organized way to assess the contribution of agricultural machinery and implements to achieving the SDGs. A comprehensive assessment was ca...
This work describes the construction, calibration and tests of a Low Cost Electronic Push Cone (L... more This work describes the construction, calibration and tests of a Low Cost Electronic Push Cone (LCPC) for the study of mechanical impedance to root growth and plant emergence. The LCPC may be used to determine Cone Index up to a 40 mm depth. The LCPC developed is made up of three parts: mechanical device, electronic circuit and software. The mechanical part is composed, basically, of an aluminium body that shelters a cone. The force for penetration in the soil is supplied by a spring of linear characteristic. The electronic part consists of a displacement sensor that is used to measure the spring's displacement. An electronic circuit makes the interface of the signal with a microcomputer. The software has the function of controlling the acquisition, storage and processing of the data. The LCPC presented good results in the calibration and in the field tests.Este trabalho descreve a construção, a calibração e os testes de um Push Cone Eletrônico de baixo custo, para utilização em...
Engenharia Agrícola, 2011
A água é um recurso cada vez mais escasso e também de alto custo em várias regiões. O beneficiame... more A água é um recurso cada vez mais escasso e também de alto custo em várias regiões. O beneficiamento de frutas e hortaliças, em geral, apresenta elevado consumo de água durante o processo de limpeza. A linha de beneficiamento e de classificação do tomate de mesa é constituída de: recebimento, limpeza, seleção, classificação e embalagem. Normalmente, o recebimento dos tomates em uma linha de beneficiamento ocorre com taxa de alimentação constante, porém com interrupções frequentes dos operadores, ocasionando desperdício de energia e água, e a eficiência de limpeza dos frutos. O objetivo deste trabalho foi avaliar um sistema de limpeza dos frutos, equipado com um controle automático de fluxo de água, visando ao uso racional de água. Para a avaliação da eficiência do processo de limpeza, aplicou-se uma metodologia que utiliza o turbidímetro. Observou-se que o índice de limpeza foi, segundo critérios estatísticos, semelhante nos sistemas automatizado e tradicional, todavia o consumo de ...
SSRN Electronic Journal
So that the levels of water stress are not harmful to the development of the crop and affect its ... more So that the levels of water stress are not harmful to the development of the crop and affect its productivity, its detection and monitoring are necessary, and it can occur in different ways. One of them is through the Crop Water Stress Index (CWSI). This index quantifies water stress through the normalization of leaf temperature between the maximum and minimum plant temperatures as a function of evaporation conditions. The responses of a low-cost infrared (IR) sensor were crossed with image processing through segmentation by the Excess Green model to develop a water stress detection system using CWSI. A soil/plant temperature map was generated through a point-to-point scan of the IR sensor. And when it overlaid with a segmented image of the experimental area, only points identified as plants had their temperature values maintained. The Non-Water-Stressed Baseline (NWSB) equation was parameterized for the same conditions of the experiment and external environmental. The experimental area was divided into three different treatments, maintained under stable water conditions throughout the experiment and the system was able to identify stably different stress values between treatments. Although the relationship between crop and environment affected the results, this work showed that using an irrigation system based on CWSI is possible.
Modern agriculture searches for new technologies for application of nutrients with higher precisi... more Modern agriculture searches for new technologies for application of nutrients with higher precision to increase productivity, minimize environment impact, reduce production costs and improve products quality. The development of such machines tends towards automation and the introduction of embed electronic systems. The aim of this work was the development of an Interface Module (MDI) to be used in a system for application of liquid products. The function of the MDI is to receive the information from the Control Module, reading the field sensors, process all this data and command the peripherals involved in the application, as: pumps, electro-valves for flux of nutrients control. The results of the analysis have shown that the MDI presented a superior performance than the required by the application system of liquid nutrients.
Agricultural mechanization is an area of knowledge that has evolved a lot over the past century, ... more Agricultural mechanization is an area of knowledge that has evolved a lot over the past century, its main actors being agricultural tractors that, in 100 years, have increased their powers by 3,300%. This evolution has resulted in an exponential increase in the field capacity of such machines. However, it has also generated negative results such as excessive consumption of fossil fuel, excessive weight on the soil, very high operating costs, and millionaire acquisition value. This paper aims to present an antiparadigmatic alternative in this area. It is proposing a swarm of small electric robotic tractors that together have the same field capacity as a large tractor with an internal combustion engine. A comparison of costs and field capacity between a 270 kW tractor and a swarm of ten swarm tractors of 24 kW each was carried out. The result demonstrated a wide advantage for the small robot team. It was also proposed the preliminary design of an electric swarm robot tractor. Finally,...
Engenharia Agrícola, 2006
O presente trabalho teve o objetivo de desenvolver uma servoválvula de baixo custo, que respondes... more O presente trabalho teve o objetivo de desenvolver uma servoválvula de baixo custo, que respondesse a um sinal eletrônico de controle, para a aplicação de insumos líquidos a taxas variáveis. Depois de realizada pesquisa na literatura das opções de válvulas existentes para a dosagem de líquidos a baixas pressões, partiu-se para o desenvolvimento de uma válvula proporcional com acionamento mecânico por intermédio de um servomotor controlado eletronicamente. Uma vez desenvolvida a servoválvula, o sistema foi submetido a um conjunto de testes, realizados em bancada desenvolvida especificamente para esse fim, onde se procurou avaliar seu comportamento em termos de repetitividade, histerese e linearidade. Como resultados, obtiveram-se três curvas de vazão em função do percentual de abertura, descrevendo três incrementos de abertura e fechamento em duas pressões diferentes de trabalho. A servoválvula apresentou boa repetitividade, razoável histerese e curva tipicamente quadrática, bem como...
Revista Brasileira de Engenharia Agrícola e Ambiental, 2002
O presente trabalho relata o desenvolvimento de um penetrógrafo, construído para operar de forma ... more O presente trabalho relata o desenvolvimento de um penetrógrafo, construído para operar de forma automática, executando um ensaio de penetração com um simples toque no botão de partida. Ele possui incorporado, um sistema dedicado de aquisição de dados, que pode armazenar até 187 ensaios e uma interface de comunicação, dispensando a conexão ao microcomputador ou "datalogger". As condições do ensaio como, por exemplo, data, localização (latitude e longitude) e profundidade, podem ser atualizadas, assim como a aferição da célula de carga, via teclado com mostrador de duas linhas. Verificou-se variação de velocidade < 5% com relação à do padrão ASAE, para índices de cone entre 500 e 5.684 kPa. O equipamento é compacto, de fácil manuseio e com capacidade operacional de até um ensaio por minuto.
Revista Brasileira de Engenharia Agrícola e Ambiental, 2001
Este trabalho descreve a construção, a calibração e os testes de um Push Cone Eletrônico de baixo... more Este trabalho descreve a construção, a calibração e os testes de um Push Cone Eletrônico de baixo custo, para utilização em estudos da resistência mecânica à emergência e ao desenvolvimento das raízes das plantas. O equipamento pode ser usado para determinar Índice de Cone até 40 mm de profundidade. O push cone desenvolvido é constituído de três partes: dispositivo mecânico, circuito eletrônico e software. A parte mecânica é composta, basicamente, de um corpo confeccionado em alumínio, que abriga um cone cuja força para penetração no solo é suprida por uma mola de característica linear; a parte eletrônica é formada por um sensor de deslocamento, utilizado para medir a deflexão da mola, além de um circuito eletrônico, que faz o interfaceamento do sinal do sensor de deslocamento com um microcomputador; o software, tem a função de controlar a aquisição, o armazenamento e o processamento dos dados. O equipamento apresentou bons resultados na calibração e nos testes de campo.
Engenharia Agrícola, 2014
The present study shows the development, simulation and actual implementation of a closed-loop co... more The present study shows the development, simulation and actual implementation of a closed-loop controller based on fuzzy logic that is able to regulate and standardize the mass flow of a helical fertilizer applicator. The control algorithm was developed using MATLAB's Fuzzy Logic Toolbox. Both open and closed-loop simulations of the controller were performed in MATLAB's Simulink environment. The instantaneous deviation of the mass flow from the set point (SP), its derivative, the equipment´s translation velocity and acceleration were all used as input signals for the controller, whereas the voltage of the applicator's DC electric motor (DCEM) was driven by the controller as output signal. Calibration and validation of the rules and membership functions of the fuzzy logic were accomplished in the computer simulation phase, taking into account the system's response to SP changes. The mass flow variation coefficient, measured in experimental tests, ranged from 6.32 to 1...
Revista Brasileira de Engenharia Agrícola e Ambiental, 2010
A produção em ambientes protegidos é uma técnica por meio da qual se objetiva proteger flores e h... more A produção em ambientes protegidos é uma técnica por meio da qual se objetiva proteger flores e hortaliças contra a ação dos elementos meteorológicos que a afetam, além de permitir ambientes favoráveis de produção durante todo o ano, com vantagens produtivas e comerciais. Um fator importante da produção em estufas é o controle da temperaturae da umidade relativa do ar. A automação do controle do ambiente possibilita o aumento da qualidade dos produtos, maior eficiência e uso racional dos recursos. O objetivo do presente trabalho foi desenvolver um sistema de controle de temperatura e umidade relativa do ar para o protótipo de uma ambiente protegido em escala reduzida, utilizando-se dos conceitos da lógica Fuzzy. As variáveis de entrada foram a temperatura e a umidade do ar e as variáveis de saída foram as atuações nos sistemas de aquecimento e de umidificação do ambiente. O processo de controle do ambiente foi simulado e os parâmetros do projeto foram ajustados. Os resultados obtidos na simulação demonstraram que os ajustes das variáveis Tar e UR, baseados no sistema de inferência Fuzzy desenvolvido, foram satisfatórios para o desempenho do sistema de controle do ambiente protegido.