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Design and test of closed-loop fertilizer control system based on PID

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2021 ASABE Annual International Virtual Meeting  2100789.(doi:10.13031/aim.202100789)
Authors:   Yihao Liu, Hui Wang, Liming Zhou, Huijuan Bai, Lili Wang, Hanlu Jiang, Gaoyong Xing
Keywords:   Precision agriculture;Precision fertilization;PID;Closed-loop control

Abstract. The implementation of precision agriculture is an important way to realize agricultural modernization, and precision fertilization technology is an important part of precision agriculture. The open-loop fertilization control system based on PID control algorithm improves the response speed of the fertilization motor, but the accuracy of fertilization control needs to be improved. In order to solve the problem of control accuracy of fertilizer application, this paper proposed a closed-loop control system of fertilizer application based on PID control algorithm, set up a fertilizer discharge test bench, compiled software with LabWindows, and took the value monitored by the flow sensor as the output value and negative feedback value, and carried out the closed-loop control experiment of fertilization flow. The test results showed that the response time of the system to achieve the target fertilizer flow rate was less than 4s. This system is more stable than the constant speed system and can significantly improve the control accuracy of the fertilizer rate.

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