Design on Fuzzy Control System of Temperature and Humidityfor Greenhouse and PLC Program
The greenhouse environmental system is a non-linear, time-varying, big-inertia synthetic system .It is diffi-cult to establish precise mathematic model for controlling .So This research chooses temperature and humidity which are the most significant impact to the crops growing as the object of study , constructs a fuzzy control system of temperature and humidity , designs fuzzy controller of temperature and humidity according to fuzzy control theory , programs PLC ( Pro-grammable Logic Controller ) program of fuzzy control algorithm , and observes the control effect of temperature and hu-midity.The running result of system shows that when the temperature and humidity settings were 22℃and 70%RH, the control process was relatively stable , temperature and humidity changed in a smaller overshot , the running of system was steady , and the system could provide the best environment for crop growth .
greenhousefuzzy control systemfuzzy controllerprogrammable logic controller
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