Design and experiment of precision irrigation system of greenhouse strawberry
The irrigation system is an innovative technology in alleviating the problems of excessive irrigation and waste of water resources in traditional greenhouse irrigation system.The purpose is to save water resources under assurance of the suitable soil moisture environment for strawberry growth.In this paper,a kind of irrigation equipment based on STM32 chip and RS485 sensor was proposed.In view of the non-linearity,large inertia and certain hysteresis of the irrigation system,fuzzy self-adaptive PID control algorithm was put forward.Combined with the regulating valve,a real-time,automatic and accurate irrigation system was designed to adjust the irrigation amount according to the change of soil moisture.Finally,a mathematical model was established according to the actual irrigation law of greenhouse strawberry in order to verify the effectiveness of the system.By comparing the effect of traditional PID and fuzzy self-adaptive PID in simulating irrigation model through MATLAB/Simulink,the fuzzy self-adaptive PID was 7.98%less than that of the traditional PID in overshoot,and maintained with±0.5%steady-state error.The results showed that the PID control algorithm improved by fuzzy rules applied in greenhouse strawberry irrigation system was beneficial to reduce the overshoot and steady-state error.In practice,this system can effectively avoid the waste of water resources.
precision irrigationthe fuzzy self-adaptive PID control algorithmgreenhouse strawberrysimulation
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