Study Of Intelligent Irrigation Control System Based On Fuzzy Control

Currently, the water resources in China is shortage, water utility efficiency is low, and the annual per capita possessive quantity of water resources is only 1/4 of the one to be the world average, which is the lowest per capita possessive quantity in the world. Particularly, the waste of agricultural water is serious. China is a big agricultural country. Agricultural water accounts for 68% of the total water consumption, more than 90% of that is agricultural irrigation water. Agricultural water shortages, waste and pollution are outstanding issues. In addition, most of the farmers always use flood irrigation, which is an inefficient irrigation. The utilization rate of irrigation water is 43%, while the one in developed countries has reached 70% to 80%. The waste of water is quite serious. These problems have become important factors restricting the sustainable development of the agriculture in China.The design of the intelligent irrigation control system has used the method of the combination of fuzzy control and sensor technology, and achieved the combination of intelligent control technology, communication technology, and irrigation technology. This study includes three aspects:1) The design of intelligent water-saving irrigation control system includes the selection of system control program, the design of overall structure of the system, and the design of control process and communication module design. Agricultural facility system is an extremely complex physical system. It is hard to establish an effective mathematical model for the classical control theory. Through the analysis comparison between computer control technology and expert control system, it is obtained that using the fuzzy control theory to establish irrigation control model can solve the problem that is the difficulty to establish mathematical model basing on the traditional control theory, improve the robustness of the control and achieve the intelligent control of water-saving irrigation.2) The study on situ detection technology of soil moisture includes soil moisture sensor technology and precision to maintain the optimal configuration technology. By analyzing the direct and indirect detection methods of soil moisture and its working principle, the FDR-type sensor is used to detect the soil moisture, and the dry weight method is used to achieve the calibration and correction of FDR-type soil moisture sensor. The results show that the measurement accuracy of FDR-type soil moisture sensor lies in 1% to 3% that is a good precision. Thus, the FDR-type soil moisture sensor achieved the integration of multi-sensor test results and improved the accuracy of detection parameters.3) The study on design and simulation of intelligent water-saving fuzzy controller firstly is the theoretical analysis on water-saving fuzzy controller including fuzzy variable selection, membership function analysis, fuzzy logic analysis, accurate process analysis and fuzzy control rules design by using the fuzzy control theory. Then the three-dimensional curved surface maps of fuzzy inputs and outputs are obtained by using fuzzy logic toolbox in MATLAB language to design the intelligent water-saving fuzzy controller and the stable dynamic output characteristics are obtained by creating and analyzing the simulation model of water-saving irrigation controller through the SIMULINK module.This study shows that intelligent water-saving irrigation control system basing on fuzzy control has advantages of high economy, small size, and high stability, and is easy to promote. This control system successfully achieving the combination of data acquisition module, data transfer module, data processing module and actuator drive module is the product of the combination of computer control technology, sensor technology and agricultural water-saving irrigation technology. The promotion of intelligent water-saving irrigation control system has far-reaching significance for solving the current shortage of water resources and reducing the serious waste of agricultural water. Meanwhile, the long-term flood irrigation mode for farmers is replaced by the application of intelligent water-saving irrigation control system which improves the utilizing efficiency of agricultural water resources, and achieves the high quality and efficient development of the agriculture.