Research On Intelligent Control System For Greenhouse Lettuce

This topic researches on the intellectual trends of control system of greenhouse.First it analyses on the the system structure and operation mechanism of greenhouse. By applying fuzzy control, neural network, design and research the control system of greenhouse, developing an intelligence fuzzy control system of greenhouse of lettuce. Main research contents and results are listed as follows:Firstly, the paper introduced the current status and direction of the control system of greenhouse in the world and in the country. And analyzed in detail the temperature, humidity and illumination’s control characteristic in the greenhouse system of the automatic control, preparing for the following further design of greenhouse control system of lettuce.Then,this article studied the theory and design method of fuzzy control system, and learned the control based on the theory of neural network. Studies show that after the combination of the neural network and fuzzy control system, the ability of the system has been increased. Fuzzy control system has fast response speed and strong robustness, and adapt to solve the nonlinear, time-varying and large time delay. But the determination of fuzzy rules and membership degree is not perfect. And neural network system can solve complex uncertainty problem of adaptive and self-learning, meanwhile the algorithm of training and learning can easily determine the fuzzy rules and membership degree. Finally, by using analytic hierarchy process, the paper gets the main factor,which effecting on the greenhouse system lettuce. Then the article use the regression method determine the growth of the plants function. At the end, the simulation of using fuzzy neural networks of greenhouse to control the greenhouse environment was carried out through MFC and Matlab. Use the intelligent system to control the temperature and humidity of the greenhouse of lettuce under a certain illumination. The experimental results show that fuzzy neural network system control the lettuce the system of greenhouse well. Therefore it has verified that the feasibility of using the system above.