摘要
为提高生鲜农产品气调保鲜配气过程的精确度及自动化水平,设计了一套气调保鲜配气远程控制系统,依托嵌入的PID控制算法和质量流量控制器实现对原料气体流量、浓度和混配比的控制;以4G网络作为远程数据传输途径,选择4G DTU作为网络数据收发器,通过手机小程序实现移动客户端的远程监控功能。系统在结构上设置了气体参数感知层、数据网络传输层和控制操作应用层;基于配气系统远程监控要求,在PLC内部嵌入Modbus RTU程序,保障DTU与PLC之间的通信;使用TCP协议,使其与云服务器之间进行数据传输。根据对系统稳定性、准确性及其通信性能的测试,在配气稳定时配气体积分数平均误差绝对值在0.22%浮动,平均误差较传统方法降低了约91.67%,且配气速度提高50%左右,极大改善了配气场地的工作条件和生产效率,为进一步完善生鲜农产品气调保鲜自动化配气生产线提供了技术支持。
In order to improve the accuracy and automation level of the air conditioning and fresh-keeping process for fresh agricultural products,a set of remote monitoring and gases distribution for fresh-keeping system was designed,which realized the control of raw gas flow,concentration and mixing ratio based on embedded PID control algorithm and mass flow controller.4G network was used as the bridge of remote data transmission,4G DTU was selected as the network data transceiver,and the remote monitoring function of mobile clients was realized by application on the phone.The gas parameter sensing layer,data network transmission layer and control operation application layer were set up in the system structure.Based on the requirements of remote monitoring of gas distribution system,Modbus RTU program was embedded in PLC to ensure the communication between DTU and PLC.TCP protocol was used as a bridge in order to enable data transmission between it and the cloud server.At the same time,remote monitoring and system maintenance on mobile client was realized based on application software in the phone.According to the test of system stability,accuracy and communication performance,the error of distribution volume fraction was 0.22%when the distribution was stable,the average error was reduced by 91.67%compared with the traditional method.Moreover,the gas distribution speed was increased by about 50%,which greatly improved the working conditions and production efficiency of the gas distribution site.It provided technical support for further perfecting the automatic gas distribution production line of fresh agricultural products.
作者
左轩夷
张海瑜
葛蔚
高志武
ZUO Xuanyi;ZHANG Haiyu;GE Wei;GAO Zhiwu(College of Engineering,China Agricultural University,Beijing 100083,China;Yantai Institute,China Agricultural University,Yantai 264670,China;Yantai Marine Economic Research Institute,Yantai 264003,China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2022年第6期416-424,458,共10页
Transactions of the Chinese Society for Agricultural Machinery
基金
烟台市校地融合发展项目(2020XDRHXMQT22)
烟台市社会科学规划研究项目(YTSK2021052)。
关键词
气调保鲜
配气系统
远程监控
4G网络
手机小程序
modified atmosphere packaging
gas distribution system
remote monitoring
4G network
mobile phone programming
