Simulation on Temperature and Humidity Nonlinear Controller of Greenhouses

Environmental factors have effects on the growth of the plants in greenhouse, so it is significant to research the changes of environmental factors in greenhouse. The dynamic mathematical model about temperature and humidity of this situation is analyzed in this paper. The changes of temperature and humidity in greenhouse are not the simple linear process but the complicated nonlinear process. The nonlinear theory and method are used to analyze controller´s parameters in order to meet the optimal quadratic performance indexes. The controller´s rationality and feasibility are proved by simulating in MATLAB2008a.