Automatic control system of sowing depth for no-tillage planter based on Flex sensor

被引：0
|
作者：
Jia H.-L. [1 ,2 ]
Zhu L.-T. [1 ,2 ]
Huang D.-Y. [1 ,2 ]
Wang Q. [1 ,2 ]
Li M.-W. [3 ]
Zhao J.-L. [1 ,2 ]
机构：
[1] Key Laboratory of Bionics Engineering, Ministry of Education, Jilin University, Changchun
[2] College of Bioligical and Agricultural Engineering, Jilin University, Changchun
[3] College of Information, Jilin Agricultural University, Changchun
来源：
Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) | 2019年 / 49卷 / 01期
关键词：
Agriculture engineering; Flex sensor; No-tillage planter; Pneumatic spring; PVDF sensor; Sowing depth control;
D O I：
10.13229/j.cnki.jdxbgxb20170988
中图分类号：
学科分类号：
摘要：
In order to solve the problem of seed uncover caused by shallow sowing depth of no-tillage planter working in straw-covered field, and to improve the control accuracy of sowing depth of the no-tillage planter, an automatic sowing depth control system was designed. Using Flex sensor as a profiling component, its motion mathematical model in the depth wheel was established, and the relationship between output resistance change rate of the sensor and the length of the sensor entering the imprinting area was deduced. According to this model, three Flex sensors were used to detect the tread deformation in real time when the depth-limiting wheel was in contact with the ground, so as to realize the pressure monitoring of the row unit to the ground. Based on the pressure change, the system regulates the down force of the pneumatic spring on the row unit in real time by controlling the electro-pneumatic proportional valve to ensure the consistency of the sowing depth. Field test results show that both Flex sensors and PVDF sensors can provide reliable profiling performance. When the seeding speed is 2.78 m/s, both the PVDF sensor-based control system and the Flex sensor-based control system can automatically adjust the sowing depth, but the control accuracy of the Flex sensor-based control system is higher that the control error is within ±8 mm. © 2019, Editorial Board of Jilin University. All right reserved.
引用
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页码：166 / 175
页数：9
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