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首页> 外文会议>Annual International Meeting of the American Society of Agricultural and Biological Engineers >An Electronic Flow Control System for a Variable-rateTree Sprayer
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An Electronic Flow Control System for a Variable-rateTree Sprayer

机译：变量率喷涂机的电子流量控制系统

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摘要

Precise modulation of nozzle flow rates is a critical measure to achieve variable-rate spray applications. An electronic flow rate control system accommodating with microprocessors and pulse width modulation (PWM) controlled solenoid valves was designed to manipulate the output of spray nozzles independently to match tree structures which would be detected with a wide-range laser scanning sensor. The PWM signals to control nozzle flow rates were generated by the microprocessors based on laser sensordetections. Multi-channel driver and protection circuits for activating solenoid valves were developed to modulate variable-rate outputs in real time. An embedded computer PC/104 along with a touch screen was used to process control algorithms and to fulfill communications between the operator and the control system. Laboratory tests demonstrated that the flow rate control system was able to achieve linear nozzle outputs with the duty cycle of PWM-controlled solenoid valves.
机译：喷嘴流速的精确调制是实现可变速率喷涂应用的重要措施。具有微处理器和脉冲宽度调制（PWM）控制的电磁阀的电子流量控制系统被设计成独立地操纵喷嘴的输出，以匹配将通过宽范围的激光扫描传感器检测的树结构。基于激光感应的微处理器产生控制喷嘴流量的PWM信号。开发了用于激活电磁阀的多通道驱动器和保护电路以实时调制可变速率输出。嵌入式计算机PC / 104以及触摸屏用于处理控制算法并满足操作者和控制系统之间的通信。实验室测试表明，流量控制系统能够通过PWM控制的电磁阀的占空比实现线性喷嘴输出。

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