Development of a Depth Control System Based on Variable-Gain Single-Neuron PID for Rotary Burying of Stubbles

Mingkuan Zhou, Junfang Xia, Shuai Zhang, Mengjie Hu, Zhengyuan Liu, Guoyang Liu and Chengming Luo
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Mingkuan Zhou: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Junfang Xia: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Shuai Zhang: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Mengjie Hu: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Zhengyuan Liu: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Guoyang Liu: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Chengming Luo: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China

Agriculture, 2021, vol. 12, issue 1, 1-16

Abstract: Rotary burying by tractor-hitched rotary tillers is a common practice in southern China for treating rice stubbles. Currently, it is difficult to maintain stable tillage depths due to surface unevenness and the residual stubbles in the field, which leads to unstable tillage quality and nonuniform crop growth in later stages. In this study, an RTK-GNSS was used to measure the real-time height and roll angle of the tractor, and a variable-gain single-neuron PID control algorithm was designed to adjust the coefficients ( K P , K I , and K D ) and gain K in real-time according to the control effects. An on-board computer sent the angles of the upper swing arm u ( t ) to an STM32 microcontroller through a CAN bus. Compared with the current angle of the upper swing arm, the microcontroller controlled an electronic-control proportional hydraulic system, so that the height of the rotary tiller could be adjusted to follow the field undulations in real-time. Field experiments showed that when the operation speed of the tractor-rotary tiller system was about 0.61 m/s, the variable-gain single-neuron PID algorithm could effectively improve the stability of the working depth and the stubbles’ burying rate. Compared with a conventional PID controller, the stability coefficient and the stubbles’ burying rate were improved by 5.85% and 4.38%, respectively, and compared with a single-neuron PID controller, the stability coefficient and the stubbles’ burying rate were improved by 4.37% and 3.49%, respectively. This work controlled the working depth of the rotary tiller following the changes in the field surface in real-time and improved the stubbles’ burying rate, which is suitable for the unmanned operation of the rotary burying of stubbles in the future.

Keywords: precision agriculture; rotary burying of stubbles; RTK-GNSS; depth control; variable-gain single-neuron PID; electronic-control proportional hydraulic system (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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