PWM Valve Monitoring for Uniform Agricultural Spray Control
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Solution Overview
Problem
Existing agricultural machines struggle to accurately monitor and control the application rate of fertilizers, pesticides, and herbicides, leading to potential overuse or underuse, which can result in product waste or inadequate treatment of crops, and lack uniformity in spray patterns.
Innovation Solution
Incorporating a pulse width modulation valve with pressure, acceleration, and magnetometer sensors to determine operating conditions, such as duty cycles and blockages, using a monitoring system to ensure precise fluid distribution and uniform application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spray systems are used without monitoring, then device complexity is reduced, but measurement precision of application rate and spray pattern uniformity deteriorates
Solution Approach 1:
The system divides the monitoring function into separate sensor modules (pressure sensor, accelerometer, magnetometer) distributed at different locations in the fluid pathway. Each sensor independently measures specific parameters (pressure, vibration, magnetic field) that collectively provide comprehensive application rate monitoring without requiring a single complex monitoring device
Solution Approach 2:
The system replaces direct mechanical flow measurement devices with indirect sensing methods. Instead of using mechanical flow meters in the fluid pathway, the system uses pressure sensors, accelerometers, and magnetometers to infer flow rate and spray pattern information from physical parameters, reducing mechanical complexity while maintaining measurement precision
2Measurement precision
If pulse width modulation valve with multiple sensors is implemented, then measurement precision of operating conditions improves, but device complexity increases
Solution Approach 1:
The monitoring system is designed to perform multiple functions using the same sensor array. The pressure sensor, accelerometer, and magnetometer collectively detect valve position, duty cycle, blockages, and cavitation conditions. This multi-functional approach allows comprehensive valve monitoring without requiring separate specialized sensors for each parameter
Solution Approach 2:
The system continuously monitors valve operating conditions using the sensors and provides feedback to the control system. The measured parameters (pressure, vibration, magnetic field) are compared against expected values to detect deviations indicating blockages, cavitation, or improper valve operation, enabling real-time adjustments to maintain optimal performance
3Reliability
If monitoring system with multiple sensors is used, then reliability of chemical application control improves, but loss of substance increases due to detected leaks and blockages
Solution Approach 1:
The system performs preliminary detection of potential problems (leaks, blockages, cavitation) before they result in significant chemical waste. By continuously monitoring pressure, vibration, and magnetic field parameters, the system can identify developing issues and trigger alerts or automatic adjustments to prevent complete system failure and maximize chemical application efficiency
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
Enhances the ability to monitor and control fluid flow, detects leaks and blockages, and maintains uniform spray patterns, thereby optimizing chemical application and reducing waste.
Implementation Method 1
at least one pressure sensor in the at least one fluid outlet line, the at least one pressure sensor upstream of the at least one pulse width modulation valve and configured to measure a fluid pressure upstream of the at least one pulse width modulation valve
Implementation Method 2
at least one accelerometer in operable communication with the at least one pulse width modulation valve and the monitoring system may be configured to determine the at least one operating condition based on acceleration data measured with the accelerometer
Implementation Method 3
at least one magnetometer in operable communication with the at least one pulse width modulation valve, wherein the monitoring system is configured to determine the at least one operating condition based on magnetic data measured with the magnetometer
Data Source
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AI summary
An agricultural machine includes a chassis, a product tank containing a fluid, and a fluid distribution system in fluid communication with the product tank. The fluid distribution system includes a plurality of fluid outlet lines configured to deliver a fluid to an agricultural field. At least one pulse width modulation valve is in fluid communication with at least one of fluid outlet line of the plurality of fluid outlet lines. The agricultural machine further includes at least one pressure sensor upstream of the at least one pulse width modulation valve and configured to measure a fluid pressure upstream of the at least one pulse width modulation valve. The agricultural machine further includes a monitoring system configured to determine at least one operating condition of the at least one pulse width modulation valve. Related methods and monitoring systems are also disclosed.