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Open AccessArticle

Development and Evaluation of a Calibrating System for the Application Rate Control of a Seed-Fertilizer Drill Machine with Fluted Rollers

1
College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
2
Jiangsu Key Laboratory for Intelligent Agriculture Equipment, Nanjing 210031, China
3
National Engineering and Technology Center for Information Agriculture, Nanjing 210095, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(24), 5434; https://doi.org/10.3390/app9245434
Received: 19 October 2019 / Revised: 29 November 2019 / Accepted: 10 December 2019 / Published: 11 December 2019
(This article belongs to the Section Mechanical Engineering)
Seed-fertilizer drill machines with fluted rollers generally utilize a calibrated relationship between the fluted-roller rotation speed and mass flow rate to control the application rate. However, this relationship model gradually deteriorates with operating time and is easily affected by working conditions. To maintain the initial operating accuracy, a self-calibrating system for adjusting the control model parameters was designed. It utilizes the application-rate information and fluted-rollers rotation speed data during the operation process to dynamically establish the calibrated relationship. During the field tests performed 18 times, the self-calibrating system could dynamically re-calibrate the relationship model. After the model parameters were updated, the application rate control system maintained a high accuracy level, though the relative deviation of control parameters was relatively higher. The average relative deviations between actual and theoretical cumulative application rates were 0.97% and 1.22% for seeding and fertilizing, respectively, and the standard deviations were 0.69% and 0.62%. Correspondingly, the average relative deviations of control parameters were 7.29% and 7.86%, and the standard deviations were 1.16% and 3.06%. These results indicate that the proposed method with closed-looped control can maintain high-quality control performance and improve the productivity of the drill machine, which will benefit the agricultural production. View Full-Text
Keywords: application rate control; seed-fertilizer drill machine; fluted rollers; parameters calibration application rate control; seed-fertilizer drill machine; fluted rollers; parameters calibration
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Yu, H.; Ding, Y.; Liu, Z.; Fu, X.; Dou, X.; Yang, C. Development and Evaluation of a Calibrating System for the Application Rate Control of a Seed-Fertilizer Drill Machine with Fluted Rollers. Appl. Sci. 2019, 9, 5434.

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