Research On Fuzzy Decoupling Control System Of Temperature And Humidity For Greenhouse Based On Virtual Instrument

With the rapidly development of the society and the constant progress of agricultural science and technology, the facility agriculture is a important symbol of the agriculture modernization,must realize only high-yield,high-quality,high-efficient modem agriculture with agricultural facility automatic measuring and controlling of environment can meet demands of food security , put forward high demand to agricultural facility living beings environmental information accuracy and automatic degree of control system dealt with to gather. Study the environmental control system of the greenhouse, the management mode of very networked modern agriculture based on control technology automatically, it is very potential.In the greenhouse environmental control system, the environment factor control direct influence crops' growth, temperature and humidity examination and the control continuously are the key points in the greenhouse environment factor monitoring research. This topic belongs to the interdisciplinary studies, proposed based on the virtual instrument greenhouse temperature and humidity fuzzy decoupling supervisory system, the synthesis has utilized multi-disciplinary new knowledge and achievement. The system uses the fuzzy control technology, the greenhouse in temperature and humidity the close coupling function and the change situation to supervisory system question and so on feedback proposed the very good solution, for the systems control precise not good, the energy consumption relative is high, the economic efficiency inferior solved with difficulty to open a new way, could process the time-variation, the hysteretic nature and the coupling, could effectively relieve between the temperature and the humidity coupling.Examines in the greenhouse using temperature and humidity sensor and the data acquisition card and the humidity parameter, has realized empirical datum automatic gathering. In the fuzzy decoupling controlled process, summarized according to the long-term experience, formulates a more reasonable temperature and humidity membership function table and the fuzzy decoupling control rule output meter. In fuzzy process, in order to advantageous the software, compiled the fuzzy decision-making table output routine according to the biggest degree of membership with the VC language. Uses on the present international popular hypothesized instrument technology, has carried on the computer observation and control system design, uses the multi parameters with the traditional test to examine the single instrument, the data alone to compile processing...