Study On Automatic Control System Of Northern Sunlight Greenhouse Environment In Winter

With development of science and technology, the modernization of agriculture is gradually reflected in the greenhouse’s control,and high-quality, efficient production of the crop have been improving. Computer control is a concentrated expression of the modern greenhouse technology. This study took the Inner Mongolia digital agricultural and Livestock demonstration project (Inner Mongolia Development and Reform Commission [2008] NO.1715) and the China Agricultural University-Inner Mongolia Agricultural University Research and Cooperation Fund (ZN2010No.12) as basis, made the environment of greenhouse internal temperature, humidity, light intensity, carbon dioxide concentration, soil temperature and humidity controlled automatically.Lower computer was programmable controller. Data measured by sensor was put into PLC, the PLC made the action implementing act.The configuration interface of host PC was made of intouch software, which could monitor and control greenhouse environment remotely,access to historical data through the host computer, view the trend of environmental factors on the environment and facilities for manual operation, alarm function. The host PC and the lower PC could communicate though software S7-200_PCAccess_V10configuration.With external environmental data measured by weather station, such as temperature, humidity and light intensity,this study predictted the greenhouse internal environment though BP neural network, which provided an effective basis for the greenhouse environment control in unusual weather conditions.