Agricultural Planter Row Unit Sensor Placement for Depth Precision
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Solution Overview
Problem
Existing row units for agricultural seed drills struggle to accurately detect and account for soil movements and compaction during material deposition, leading to inadequate precision in determining placement depth and coverage height.
Innovation Solution
The row unit is equipped with multiple sensors positioned behind the depth control element to detect different areas of the soil, including the track and seed furrow, and an evaluation device that considers geometric and positional information to enhance precision, using optical, acoustic, or camera-based sensors to improve detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are arranged in front of or at the depth control element, then the device complexity is reduced, but the measurement precision of deposition depth and coverage height deteriorates due to inability to detect soil movements and compaction
Solution Approach 1:
The patent positions sensors in the longitudinal dimension behind the depth control element rather than only laterally, enabling detection of soil movements and compaction that occur after material deposition. This spatial arrangement allows the sensors to measure the actual final position of deposited material relative to the depth control element, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The evaluation device processes sensor signals to determine deposition depth and coverage height, creating a feedback loop that measures the actual outcome of the depth control element's action. This feedback mechanism enables continuous monitoring and adjustment, improving measurement precision without requiring complex mechanical modifications to the depth control system itself.
2Measurement precision
If multiple sensors are positioned behind the depth control element to detect different soil areas, then the measurement precision of soil conditions improves, but the device complexity increases
Solution Approach 1:
The patent divides the detection task among multiple sensors, each responsible for detecting specific areas behind the depth control element. This segmentation allows comprehensive coverage of soil conditions (including compaction zones and deposited material areas) while maintaining manageable system complexity through modular sensor placement and individual signal processing.
Solution Approach 2:
The multiple sensors serve universal detection functions, each capable of measuring various soil parameters (position, compaction, moisture) in different areas. This multi-functionality allows a single sensor system to provide comprehensive soil condition data without requiring specialized sensors for each specific measurement type, thereby limiting the increase in device complexity.
3Device complexity
If sensors detect only one area behind the depth control element, then the device complexity is minimized, but the measurement precision of deposition depth deteriorates due to inadequate soil movement detection
Solution Approach 1:
The patent extends detection into the longitudinal dimension by positioning sensors behind the depth control element, capturing soil movements and compaction that occur during and after deposition. This dimensional extension enables accurate deposition depth determination while maintaining relatively simple sensor configuration, resolving the contradiction between complexity and precision.
Data Source
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AI summary
The invention relates to a row unit (20) for a sowing machine (10) for depositing distribution material, comprising: at least one furrow opening element (23) which is provided to open a seed furrow (230); at least one depth guidance element (24A, 24B) which is provided to set a defined depositing depth and/or covering height for the distribution material; and at least one allocated electronic evaluation device (200) which comprises a plurality of sensors (30A, 30B, 31) allocated to the row unit (20), wherein the sensors (30A, 30B, 31) are designed to scan the useful area within a detection region (300A, 300B, 310) allocated to the respective sensors (30A, 30B, 31), and wherein the evaluation device (200) is designed to determine, by means of the sensors (30A, 30B, 31), the depositing depth and/or covering height of the distribution material deposited in the seed furrow (230). In order to further improve the depositing accuracy and/or depositing quality of the distribution material in a simple manner, according to the invention the sensors (30A, 30B, 31) are arranged such that the detection region (300A, 300B, 310) of the plurality of sensors (30A, 30B, 31) is arranged and/or is located behind a support surface (AA, AB) of the at least one depth guidance element (24A, 24B), as seen in the travel and/or working direction (F) of the row unit (20), during the depositing of the distribution material.