Distributed Network Control of Droplet Size and Application Rate for Precision Spraying
Operational Requirements for Agricultural Spray Application:
PPT Slide
Off-target drift constraints
The Problem - The Nozzle
Pulse-Width Modulation (PWM) for Flow Control
Nozzle assembly
Pulsed Emissions from Nozzles
PWM Flow Control
Droplet size control strategy
Sprayer Control Components
Interface Unit
Boom Control Module
Physical Layout
Boom Control Modules
On-board GPS control of rate and droplet size
Control Logic Overview
Flow Rate Control
Pressure Control
Vmd vs. flow - 8004 flat fan nozzle
Control Envelope - 8004 nozzle
Fine droplet fraction - 8004 nozzle
Drift envelope - 8004 nozzle
Operation
Control Options
Feedforward Strategy
Implementing the pressure and flow control loops
Overall system architecture
Test sequence of control setpoints
System response with PI control
System response with PI and feedforward control
Test of system with variable droplet size and rate
System response with variable droplet size and rate
Conclusions
Conclusions, continued
Email: mstone@okstate.edu
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