Planter Row Unit Downforce Control Using Acceleration Sensing
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Solution Overview
Problem
Existing seeding machines struggle to safely navigate over soil obstructions while maintaining adequate downforce for planting, leading to potential damage and inefficiencies.
Innovation Solution
A row unit with a downforce actuator and acceleration sensor system that adjusts downforce based on acceleration thresholds, transitioning to a floating state to avoid obstructions, ensuring consistent planting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the row unit maintains constant downforce during operation, then planting performance is consistent, but the row unit cannot safely navigate over soil obstructions
Solution Approach 1:
The downforce actuator transitions from a static constant-force state to a dynamic adaptive state that responds to acceleration sensor inputs. When obstacles are detected through increased acceleration, the system dynamically reduces downforce to enable safe navigation, then restores appropriate downforce for planting operations, thus adapting the force application to varying operational conditions
Solution Approach 2:
The acceleration sensor provides real-time feedback on row unit motion to the controller, which adjusts the downforce actuator accordingly. This closed-loop feedback mechanism allows the system to detect obstacles through acceleration changes and automatically modulate downforce to prevent damage while maintaining planting effectiveness during normal operation
2Force
If the row unit applies high downforce to engage ground implements, then soil engagement is adequate for planting, but the row unit cannot float over soil obstructions
Solution Approach 1:
The system changes the downforce parameter dynamically based on operational conditions. During normal planting, high downforce is applied to ensure adequate soil engagement. When acceleration sensors detect obstacles, the system transitions to a floating state with reduced or zero downforce, allowing the row unit to adapt to varying ground conditions and navigate over obstructions safely
3Adaptability or versatility
If the row unit uses fixed downforce, then the structure is simple, but it cannot adapt to different soil conditions and obstructions
Solution Approach 1:
The system employs self-service automation where the acceleration sensor and controller automatically detect and respond to obstacles without operator intervention. The downforce actuator autonomously adjusts force application based on real-time acceleration data, enabling the system to adapt to soil conditions and obstructions independently, reducing the need for manual adjustment mechanisms
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
Enables safe navigation over soil obstructions while maintaining optimal downforce, reducing damage and improving planting efficiency.
Implementation Method 1
An acceleration sensor is configured to detect accelerations of the row unit
Implementation Method 2
A row unit downforce actuator is operable to push the row unit frame toward the soil to adjustably control soil engagement forces
Data Source
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AI summary
A row unit (118) for a seeding machine (10) operable to plant seeds into soil. A frame (130) supports a furrow opener (134), a gauge wheel (132), a seed dispenser (138), and a furrow closer (140). A row unit downforce actuator (174) is operable to push the row unit frame (130) toward the soil to adjustably control soil engagement forces for the furrow opener (134), the gauge wheel (132), and the furrow closer (140). An acceleration sensor (148) is configured to detect accelerations of the row unit (118). A controller (178) is in communication with the acceleration sensor (148) and the row unit downforce actuator (174), and the controller (178) is programmed with an algorithm to maintain a target downforce value during operation of the row unit (118). The controller (178) is further programmed to abandon the target downforce value and relieve the row unit downforce actuator (174) in response to a signal from the acceleration sensor (148) indicative of acceleration of the row unit (118) in excess of a predetermined threshold.