基于Zigbee的多节点管道喷雾压力控制系统研究

Research of Multi-node Pressure Control System for Pipeline Spray Based on ZigBee

喷雾压力是衡量喷雾效果的重要指标之一。为此,针对山地果园现有管道喷雾系统(简称单节点系统)不控制压力和药液量的输出或只控制药液泵出药口压力的问题,设计了一种管道喷雾多节点药液压力控制系统(简称多节点系统)。该系统以单片机为核心,在喷雾管道上部署多个Zig Bee无线压力发送节点,采用Zig Bee无线模块进行通信,监测各节点药液压力。控制系统采用比例-积分-微分(Proportion Integration Differentiation,PID)算法控制变频电动机的转速,从而改变药液泵的药液量输出,以控制整个喷雾管道内的药液压力。试验结果表明:该系统在0. 6～1. 6MPa的压力范围内,单节点系统节点压力方差为0. 050～0. 31,压力吻合度为62.67%～65. 93%;多节点系统节点压力方差为0. 000 70～0. 003 5,压力吻合度为98. 29%～99. 85%。研究结果解决了现有管道喷雾对药液压力缺乏有效控制的问题,提高了喷雾效果,具有较高的推广应用价值。

Spray pressure is one of the important indicator of the spray effect.Aiming at the problem that the mountainous orchard existing pipeline spray system(short name as single point system)does not control the output of pressure and dose output or only controls the pesticide pump outlet pressure,we design a multi-node pipeline pressure control system(short name as multi-point system).The system is centered on the microcontroller,multiple Zigbee wireless pressure terminal nodes for communication are deployed on the spray pipe,monitoring the liquid pressure of each node,the control system adopts PID algorithm to control the speed of variable frequency motor,thus changing the drug pump dose,to control the liquid pressure in the spray pipe.The results showed that:when the system is in the 0.6-1.6MPa pressure range,the node pressure variance of single point system is 0.050-0.31 pressure fit degree is 62.67%-65.93%,the node pressure variance of multi-point system is 0.00070-0.0035,pressure fit degree is 98.29%~99.85%.The results solve the problem that the existing pipeline spray has no effective control on the liquid pressure,improving the spray effect,have good application value.