Study On Fuzzy Control Of Intelligent Greenhouse

This topic mainly aims at a control system willi lower automation situation which are used greenhouse, by deeply analyzing green house executing equipment cause the influence for environment factor. Applying fuzzy control, computer control technology, PLC control technology and communication technology to design and research the control system of greenhouse, and developing a intelligence fuzzy control system of greenhouse.As a embranchment in the control field, fuzzy control based on membership function and fuzzy composing principle, moreover, add the people's intuition. Fuzzy control can effectively control the non-linear , complicated and multi- variable system whose parameter are fluctuant and signals aren't accurate. Especially, fuzzy control has high robustness for the parameter's fluctuation and the load's disturbance.The system of the greenhouse condition is a big system, it's difficult to set up a mathematic model. Using normal control method hardly get a satisfied dynamic and static performance. Considering the characteristic of the fuzzy control, it needn't build the mathematic model of the controlled object, thus, it is possible to control the system that is non-linear, time variety and lag system. It is reasonable to adopt fuzzy control method to control greenhouse's condition. This thesis provides a designing scheme of the fuzzy control, and use computer technology and fuzzy control to get a intelligence system that is fast, exact and good performance. This system can test and control temperature, wet, carbon dioxide thickness and illumination intension. This system composes of PC and PLC, controlling software is Kingvievv. The software can achieve data collection inside, real-time data and history data can be displayed, real-lime curve and history curve can be pictured, real-time modified the controlled parameter, by the follow up to achieve real-time monitor and control in the greenhouse.This thesis absorbs the pith of traditional greenhouse whatever domestic and overseas, in thisfoundation, I design a general, intelligence and lower cost system which accords with the situation of our country. This system mainly controls environment factor and provides a optimization condition for the crop, reducing grows seedlings the cycle and realizing energy conservation highly effective grows seedlings.