Agricultural Sprayer Parameter Sensing for Uniform Application
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Solution Overview
Problem
Agricultural sprayers experience pressure variations across the boom width leading to over- or under-application of spray liquids due to nozzle wear, clogging, or blockages, resulting in ineffective spraying and economic loss.
Innovation Solution
Agricultural sprayers equipped with a nozzle body, spray tip, parameter sensing module, and PWM valve that includes a flow meter and pressure sensor, allowing for real-time monitoring and control of liquid flow to maintain desired application rates and detect abnormal operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple spray nozzles are connected to the same boom section, then the sprayer can cover larger areas, but pressure variations across the boom width lead to over-application or under-application of spray liquid
Solution Approach 1:
The system divides the boom into multiple independently monitored sections, each with its own parameter sensing module that measures pressure and flow rate. This segmentation allows individual nozzles to be identified and adjusted separately, compensating for pressure variations across the boom width while maintaining overall coverage area.
Solution Approach 2:
The parameter sensing module provides real-time feedback on pressure and flow rate at each nozzle. The controller uses this feedback to detect deviations from target application rates and automatically adjusts PWM valve duty cycles to compensate for pressure variations, ensuring uniform application across the entire boom width.
2Ease of operation
If PWM valves cycle open and closed to control flow rate, then flow rate can be precisely controlled, but turbulence is generated in the liquid flow through the nozzle
Solution Approach 1:
The PWM valve operates in periodic cycles, opening and closing at high frequencies with very short duty cycles. This periodic action allows precise flow rate control through duty cycle modulation while the high frequency and short duration minimize turbulence generation compared to continuous valve operation.
3Productivity
If nozzles are used for extended periods, then productivity is maintained, but nozzles wear, become partially clogged, or fully blocked
Solution Approach 1:
The parameter sensing module continuously monitors pressure and flow rate parameters throughout the entire operational duration. By detecting deviations from expected values early in the extended operation period, the system can identify nozzle wear or clogging before they fully impact productivity, allowing for timely maintenance or replacement.
Solution Approach 2:
Real-time feedback from the parameter sensing module enables continuous monitoring of nozzle performance throughout extended operation. The controller can detect changes in flow characteristics that indicate nozzle degradation and trigger alerts or adjustments to maintain consistent application rates, thereby preserving reliability during prolonged use.
4Manufacturing precision
If pressure variations occur across the boom width, then spray distribution is affected, but the system complexity increases
Solution Approach 1:
The system segments the spray boom into multiple independently monitored zones, each with its own parameter sensing module. This modular segmentation allows pressure variations across the boom width to be detected and compensated for locally, improving spray distribution accuracy without requiring a complete system redesign.
Solution Approach 2:
The system replaces complex mechanical pressure compensation mechanisms with electronic sensing and control. Parameter sensors electronically measure pressure and flow rate, and the controller uses software algorithms to calculate and adjust PWM duty cycles, substituting mechanical complexity with electronic measurement and control systems.
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
Ensures precise application rates by detecting and addressing nozzle issues in real-time, preventing over- or under-application, reducing material waste, and enhancing operational efficiency.
Implementation Method 1
The parameter sensing module includes a flow meter and a pressure sensor
Implementation Method 2
The parameter sensing module includes a flow meter and a pressure sensor
Implementation Method 3
The PWM valve cycling between an open and a closed state generates turbulence in the liquid flow through the nozzle
Implementation Method 4
The PWM valve cycling between an open and a closed state generates turbulence in the liquid flow through the nozzle
Data Source
AI summary
A parameter sensor for an agricultural sprayer is mounted to an applicator and configured to determine liquid parameters of the liquid flowing through the spray nozzle. The parameter sensing module includes one or both of a flow meter and a pressure sensor. The parameter sensor includes sensor circuitry configured to determine a flow rate based on data generated by the flow meter and determine a liquid pressure based on data generated by the pressure sensor.