...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Transactions of the ASABE >DEVELOPMENT OF DIGITAL FLOW CONTROL SYSTEM FOR MULTI-CHANNEL VARIABLE-RATE SPRAYERS
【24h】

DEVELOPMENT OF DIGITAL FLOW CONTROL SYSTEM FOR MULTI-CHANNEL VARIABLE-RATE SPRAYERS

机译：多通道可变速率喷雾器数字流控制系统的研制

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Precision modulation of nozzle flow rates is a critical step for variable-rate spray applications in orchards and ornamental nurseries. An automatic flow rate control system activated with microprocessors and pulse width modulation (PWM) controlled solenoid valves was developed to control flow rates of multi-channel nozzles independently for variable-rate sprayers. The system consists of a data acquisition module, a data processing module, and a flow rate control module. An embedded computer along with a touch screen was used to process control algorithms and allowed communication between the sprayer operator and the control system. The flow rate control module was designed with multi-channel driver circuits for activating the solenoid valves and driver protection circuits for avoiding surge voltages due to frequent on/off actions of the solenoid valves. Laboratory tests were conducted to verify) the accuracy of the control system with three nozzles (0.530 to 1.703 L min(-1)) at four different operating pressures (138 to 345 kPa) and ten duty cycles (10% to 100%). The microcontroller-controlled circuit precisely produced PWM signals with desired pulse widths to match the duty cycles, and linear spray outputs were achieved accurately with the duty cycles of the PWM-controlled solenoid valves. With the protection circuit for the solenoid valve drivers, the longevity of the solenoid valves increased from 350 to 2,426 h. The system offers flexibility in choosing the number of connection channels needed for the number of nozzles individually or in a group on sprayers. Accordingly, together with canopy structures and travel speeds from laser scanning or other sensors, this compact control system is capable of performing variable flow rate functions for multiple nozzles separately.
机译：对于果园和观赏苗圃的可变速率喷雾应用，喷嘴流量的精确调节是至关重要的一步。开发了由微处理器和脉宽调制（PWM）控制的电磁阀激活的自动流量控制系统，以独立控制可变速率喷雾器的多通道喷嘴的流量。该系统由一个数据采集模块，一个数据处理模块和一个流量控制模块组成。嵌入式计算机和触摸屏用于处理控制算法，并允许喷涂机操作员与控制系统之间进行通信。流量控制模块设计有用于激活电磁阀的多通道驱动器电路和用于避免由于电磁阀的频繁开/关动作而引起的浪涌电压的驱动器保护电路。进行了实验室测试，以验证在四个不同的工作压力（138至345 kPa）和十个工作循环（10％至100％）下，三个喷嘴（0.530至1.703 L min（-1））控制系统的精度。微控制器控制的电路精确地产生具有所需脉冲宽度以匹配占空比的PWM信号，并且通过PWM控制的电磁阀的占空比精确地实现了线性喷涂输出。借助电磁阀驱动器的保护电路，电磁阀的寿命从350小时增加到2,426小时。该系统可灵活地选择单个或成组的喷嘴所需数量的连接通道。因此，与激光扫描或其他传感器的机盖结构和行进速度一起，这种紧凑的控制系统能够对多个喷嘴分别执行可变的流量功能。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号