Sprayer Nozzle Equalization via Tilt-Adaptive Pulse Width Modulation
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Solution Overview
Problem
Agricultural sprayers face challenges in maintaining uniform fluid flow rates across multiple nozzles due to varying terrain, fluid types, and nozzle configurations, leading to inefficiencies in material distribution.
Innovation Solution
An equalization system that uses flow indicators, sensors, and control parameters to adjust nozzle output based on terrain tilt and fluid flow rates, implementing pulse width modulation to ensure uniform spray profiles across the boom assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional sprayer systems use fixed nozzle configurations without adjustment, then the system structure remains simple, but uniform fluid distribution across nozzles deteriorates due to terrain variations and pressure drops
Solution Approach 1:
The system dynamically changes flow control parameters for each nozzle based on measured terrain tilt and pressure conditions. The controller adjusts pulse width modulation duty cycles individually for each nozzle to compensate for variations in fluid pressure and terrain, maintaining uniform fluid distribution without requiring complex mechanical adjustments to the nozzle hardware itself
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with an electronic control system that uses sensors and pulse width modulation to regulate fluid flow. Instead of mechanically adjusting each nozzle's opening or positioning, the system uses electronic signals to control solenoid valves, simplifying the mechanical structure while achieving precise flow uniformity
2Manufacturing precision
If the sprayer operates on uneven terrain without tilt compensation, then the control system remains simple, but fluid distribution uniformity deteriorates due to boom tilt and pressure variations
Solution Approach 1:
The system incorporates sensors that continuously measure terrain tilt and fluid pressure, feeding this information back to the controller. The controller uses this feedback to dynamically adjust the pulse width modulation signals sent to each nozzle, compensating for terrain-induced variations and maintaining uniform spray profiles across diverse terrain conditions
Solution Approach 2:
The system transitions from static, fixed nozzle settings to dynamic, real-time adjustment of flow parameters. The controller continuously adapts the duty cycle of pulse width modulation signals based on current terrain conditions and pressure measurements, enabling the sprayer to maintain uniform fluid distribution across changing terrain and operational conditions
3Manufacturing precision
If pulse width modulation is used to control each nozzle individually, then fluid distribution uniformity improves, but the device complexity and control system requirements increase
Solution Approach 1:
The system divides the sprayer into individually controllable segments, with each nozzle or nozzle group having its own flow control parameter. The controller manages multiple pulse width modulation channels independently, allowing precise control of each segment's fluid flow based on local conditions, thereby achieving high precision flow rate control across the entire sprayer system
Solution Approach 2:
The system uses periodic pulse width modulation signals to control fluid flow through solenoid valves. By varying the duty cycle of these periodic pulses, the system achieves precise average flow rate control for each nozzle while using simple, reliable on/off valve hardware, thus managing electronic control complexity through well-established modulation techniques
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures uniform fluid distribution by dynamically adjusting nozzle flow rates, maintaining target outflow rates and spray profiles even on uneven terrain, enhancing application efficiency and consistency.
Implementation Method 1
implementing pulse width modulation to ensure uniform spray profiles across the boom assembly
Data Source
AI summary
A method of equalizing a spray system for an agricultural sprayer includes measuring an output flow rate or fluid pressure for one or more nozzles on a boom assembly, determining an amount of tilt of the boom assembly with respect to a reference frame, and associating the amount of tilt with the output flow rate or fluid pressure for each of the one or more nozzles. The method also includes determining tilt-updated flow settings for the spray system based on the output flow rate or fluid pressure and storing the tilt-updated flow settings in a spray profile for later use during a spray operation.