Research On Monitor And Control System Of Greenhouse Environment Based On Virtual Instrumentation

Compared with some developed country, greenhouse industry is uncultured in our country. Many aspects of greenhouse in our country must be improved, which include lower technology, bad monitor and control condition, inferior management and so on. Now how to use automotic control system to improve the environment efficiency, and how to manage crop efficiency, are two important tasks in greenhouse research. It has much significance to improve the level of greenhouse manufacturing.Applying virtual instrumentation technology, sensor technology, instrument technology and computer technology, the author designs and develops the environmental monitor and control system of greenhouse. It is the main trait that embedded DAQ and PCI bus transmitting were adopted. On the one hand, testing data is acquired automatically by tempeture sensor, humidity sensor, light sensor and CO2 sensor; the enviroment of greenhouse is regulated automatically. On the other hand, the acquired data is showed real-timely and controlled messages are output precisely, the powerful software function is the emphesis of the research that programmed in virtue of LabwondowsCVI.The microclimate in greenhouse is characterized by complicated, nonlinear and uncertain environment, and is extremely difficult to set up the precise mathematics model for It, so the research adopts the fuzzy control. The fuzzy control does not need the accurate mathmatics model of the controlled object, which is a nonlinear control system. The robust stability of fuzzy control is good and its delicacy is poor to the change of system parameter.this control is realized easily and can attain good control result.The whole system has friendly interface, convenient operation and comprehensive function.