| Among the various greenhouse environment factors,the temperature is an important factor for flowers to grow.It is still an important subject how auto-control temperature system to control greenhouse temperature in our country.It has great significance to the future development of flower greenhouse in the plateau region.Based on aboved describes,the greenhouse environment control system development situation and some important research achievements all over the world was introduced.Then Kunming climate and the shortcoming of greenhouse control was introduced,putting forward the scope of the study and research of this topic.In this dissertation,the Kunming climate was regarded as study background,and combined Chinese Rose case to analyze flowers temperature demand.And analyzing covering materials,film and ventilation manner to greenhouse temperature affect.It offers a stability security to actual engineering.Based on Chinese Rose temperature demand,temperature control system of greenhouse was designed by fuzzy-pid controller.Then using MATLAB to simulated fuzzy-pid controller,and comparing with traditional PID control to analyze the response speed,stability and control accuracy advantages,which laid the theoretical basis of fuzzy-PID control.In addition,rational Programmable Logic Controller(PLC)and temperature deceive for plateau flower greenhouse were used.Then the fuzzy-PID control procedure for the temperature control was designed.And developing upper computer software,this temperature control system contains PC,upper computer,PLC and control deceive.Finally,a confirmatory test based on existing laboratory equipment was constructed.The test purpose is to test the effectiveness of PLC procedures,upper control procedures and the system. |
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