Dynamic Seed Metering for Curved Agricultural Paths
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Solution Overview
Problem
Agricultural seeding implements face challenges in maintaining uniform seed distribution when following curved paths, leading to uneven seed concentration, which affects crop yield due to variations in row unit speed and soil deposition rates.
Innovation Solution
A particulate material metering system with a controller that determines the radius of curvature of the implement's path and adjusts the flow rates of metering devices to ensure consistent seed deposition across the field, compensating for speed differences and path curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the seeding implement follows a curved path through the field, then the row units on the outside of the path have higher ground speed and cover more area, but the row units on the inside of the path deposit particulate material at a concentration greater than target while outside row units deposit at concentration lower than target
Solution Approach 1:
The system dynamically adjusts the metering rate of each row unit based on real-time curvature detection. When the implement follows a curved path, the controller increases the metering rate for inside row units and decreases it for outside row units, transforming the static metering system into a dynamic one that compensates for speed variations and maintains uniform seed concentration across all rows.
Solution Approach 2:
The system employs feedback control by detecting the curvature of the implement's path and using this information to adjust metering rates. The curvature detection provides feedback about the implement's orientation and speed variations, which the controller uses to calculate and apply appropriate metering adjustments to each row unit, ensuring target concentration is maintained despite path curvature.
2Manufacturing precision
If the row units on the inside of the curved path deposit seeds at higher concentration, then seed distribution becomes non-uniform, but reducing overall seeding rate to compensate would reduce total crop yield
Solution Approach 1:
The system applies local quality control by adjusting the metering rate individually for each row unit based on its position in the curved path. Inside row units receive increased metering rates while outside row units receive decreased rates, allowing each location to have the specific seed concentration it needs to achieve uniform overall distribution without reducing total yield.
Solution Approach 2:
The seeding system is segmented into individually controllable row units, each with its own metering adjustment capability. This segmentation allows the controller to apply different metering rates to different rows based on their position in the curved path, preventing the need to uniformly reduce seeding across all rows and thereby maintaining total crop yield while achieving concentration uniformity.
3Manufacturing precision
If the metering system does not compensate for path curvature, then the system remains simple and reliable, but seed distribution becomes non-uniform affecting crop yield
Solution Approach 1:
The system replaces complex mechanical adjustment mechanisms with an electronic control system that uses curvature detection and electronic signal processing to adjust metering rates. This substitution of mechanical systems with electronic and computational systems achieves precise seed concentration uniformity while keeping the physical structure relatively simple and reliable.
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
This solution ensures that each row unit deposits seeds at a target concentration, enhancing crop yield by maintaining uniform seed distribution and density, thereby reducing competition among plants and weed population.
Implementation Method 1
The airflow carries the flowable particulate material to the row units via conduits extending between the air cart and the seeding implement
Implementation Method 2
the controller is configured to determine a radius of curvature of a path of the agricultural implement
Data Source
AI summary
A particulate material metering system includes a controller configured to determine a radius of curvature of a path of a lead vehicle coupled to an agricultural implement. The controller is configured to determine a lead time of the lead vehicle relative to the agricultural implement based on a speed of the lead vehicle and/or the agricultural implement. The controller is configured to determine a radius of curvature of a path of the agricultural implement based on the radius of curvature of the path of the lead vehicle at a determination time, in which the determination time is a current time minus an offset time, and the offset time is based on the lead time. The controller is configured to determine target particulate material flow rates of respective metering devices of the particulate material metering system based on the radius of curvature of the path of the agricultural implement.