Research On The Temperature-Humidity Relevant Theory And Control Equipment Of The Greenhouse

Greenhouse environment system is a multi-variable, large inertia, nonlinear system in whichexists the phenomenon of cross-link, pure delay, etc. Through the study on summary of domestic and international facilities, agricultural status quo and greenhouse temperature control algorithm, the thesis designs the intelligent monitoring system on the foundation of agricultural expertsbase in corporation with target greenhouse actual situation.On analysis greenhouse historical data by using SPSS the thesis comes to a reasonable level of greenhouse categories and a variety of simple and reliable discriminant function cross-examination through the numerical properties of their research and serves as a proof of high accuracy of the model. On this basis, the thesis studies the relevance of greenhouse temperature and humidity rate of change. It provides the evidence for fuzzy decoupling control algorithm andmakes a tentative research on greenhouse temperature and humidity. As for bombing of fuzzy control rules, the thesis put forward hierarchical fuzzy control method combining fractal and changed the thinking of the domain and the solution of the problem has practical significance. Inorder to solve the problem of greenhouse control of large time delay, the thesis desighs fuzzy regression prediction model based on the design of the fuzzy predictive control methods. In these studies, the greenhouse control factor control methods are made in accordance with the basis of objective conditions of greenhouse facilities.The overall control structure is featuring distributed control and centralized management. For the portability and scalability of system, the thesis conducts the modular design of the greenhouse factor collector and controller. Supervised by the main controller in the upper ARM, the main controller is based on expert knowledge base provided by the target and control requirements. Combining the control, model, calculation, controlling and output, the design serves to store data and receive control commands.Considering anti-static, lightning, errors control the thesis design in details the hardware circuits and software programs. Demonstrated by a detailed error analysis of the system error in data collection degrees, it proves the feasibility of system design. The thesis designs the specific performance verification programs and further examines on-line operation of the greenhouse intelligent expert control system and its reliability of data acquisition and control accuracy.