基于PWM的变浓度喷施控制系统设计与试验  

Design and Test of Variable Spraying Concentration Regulation System Based on PWM

作　　者：孔辉 伊丽丽 兰玉彬 白京波 韩鑫[1,2] Kong Hui;Yi Lili;Lan Yubin;Bai Jingbo;Han Xin(School of Agricultural Engineering and Food Science,Shandong University of Technology,Zibo 255000,China;National Sub-center for International Collaboration Research on Precision Agricultural Aviation Pesticide Spraying Technology,Zibo 255000,China;Shandong Siyuan Agricultural Development Co.Ltd.,Zibo 255000,China)

机构地区：[1]山东理工大学农业工程与食品科学学院,山东淄博255000 [2]国家精准农业航空施药技术国际联合研究中心山东理工大学分中心,山东淄博255000 [3]山东思远农业开发有限公司,山东淄博255424

出　　处：《农机化研究》2021年第12期123-127,共5页Journal of Agricultural Mechanization Research

基　　金：山东省引进顶尖人才“一事一议”专项(鲁政办字[2018]27号);淄博市重点研发计划项目(校城融合类)(2019ZBXC053);全国第三批农村综合改革标准化试点项目(国标委发[2018]66号);国家现代农业标准化区域服务与推广平台项目(NBFW-3-2018)。

摘　　要：变浓度喷施技术与变流量喷施技术相比,具有雾滴喷洒效果好、避免人药接触、作业后剩余药和水可回收重复使用(降低环境污染)等优势。为此,基于脉冲宽度调制(又称PWM)技术研发了变浓度喷施控制系统,以STM32F103单片机为控制核心,基于PWM技术精准调制整个系统,根据作物病虫草害的严重程度,在线配置不同浓度的农药进行作业。试验结果表明:基于PWM的变浓度喷施控制系统可行,控制系统响应时间少;喷洒效果良好,系统流量和蠕动泵单体流量误差在1%左右,最大不超过1.50%;实际喷洒浓度与预计喷洒浓度误差不超过2.71%。Compared with the variable flow rate spray technology, the variable concentration spray technology has the advantages of good spray effect, avoiding the contact of human medicine, and reducing environmental pollution by recycling the residual medicine and water after operation. The system is based on STM32 F103 single-chip microcomputer and PWM technology to precisely modulate the whole system. According to the severity of crop diseases, insect pests and weeds, different concentrations of pesticides can be configured online for operation, so as to improve the utilization rate of pesticides. The system has high control accuracy, short response time and low cost, which can be applied to ground machinery and plant protection UAV in the process of constant speed driving.This paper introduces the composition, working principle of the system and analyzes the control module and dispensing module.At the same time, test experiments are done to verify the system performance. The results show that: the variable spraying concentration control system based on PWM designed in this paper is feasible;the spraying effect of the system is good, the error of system flow and single flow of peristaltic pump is about 1%, the maximum error is not more than 1.50%.The error between the actual spraying concentration and the expected spraying concentration is not more than 2.71%.

关 键 词：植保 变量喷施 变浓度 PWM技术 

分 类 号：S491[农业科学—植物保护] S220.39