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Closed-Loop Control of Chemical Injection Rate for a Direct Nozzle Injection System.

Xiang Cai1, Martin Walgenbach2, Malte Doerpmond3

  • 1School of Information Science and Technology, Beijing Forestry University, Beijing 100083, China. caixiang617@gmail.com.

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Summary
This summary is machine-generated.

This study introduces a direct nozzle injection system (DNIS) for precise pesticide application. A proportional-integral-derivative (PID) control strategy with a rapid-reacting solenoid valve (RRV) ensures accurate chemical flow rate control.

Keywords:
closed-loop controldirect nozzle injectionpulse width modulationthermodynamic flowmetervariable-rate application

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Area of Science:

  • Agricultural Engineering
  • Precision Agriculture
  • Control Systems

Background:

  • Accurate pesticide metering is crucial for site-specific and variable-rate application in agriculture.
  • Existing systems often face challenges with chemical concentration transport lag.

Purpose of the Study:

  • To develop and evaluate a prototype direct nozzle injection system (DNIS) for reduced chemical concentration transport lag.
  • To implement and assess a proportional-integral-derivative (PID) control strategy for precise chemical injection rate control.

Main Methods:

  • Utilized a rapid-reacting solenoid valve (RRV) driven by pulse-width modulation (PWM) for adjustable chemical injection.
  • Employed a thermodynamic flowmeter for real-time, viscosity-independent flow rate measurement and feedback.
  • Applied a closed-loop PID control strategy, including a two-phase approach to address nonlinear valve characteristics.

Main Results:

  • The DNIS prototype demonstrated significantly reduced chemical concentration transport lag.
  • The PID control strategy achieved set-point chemical flow rates within 4 seconds.
  • A two-phase PID control strategy outperformed single PID control due to the RRV's nonlinear characteristics.
  • Output stability of the chemical injection rate was markedly improved with the control strategy.

Conclusions:

  • The developed DNIS, coupled with a PID control strategy, offers a viable solution for accurate and responsive pesticide application.
  • The system effectively addresses challenges related to transport lag and flow rate control in precision agriculture.
  • The two-phase PID control approach enhances system performance by compensating for nonlinearities in the injection valve.