Seed Planting Depth Control Using Terrain-Following Row Units
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Solution Overview
Problem
Existing seeding implements lack a robust mechanism to dynamically maintain the operating depth of tillage row units relative to seeding row units, leading to control instabilities and inefficiencies in seed placement due to varying soil conditions and mechanical complexity.
Innovation Solution
A central controller dynamically adjusts the operating depth of tillage and seeding row units using closed-loop control, eliminating the need for direct linkage and additional gauging wheels by electronically monitoring and adjusting the position of tillage row units relative to the implement frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hydraulic cylinders are used to apply force to linkages to maintain proper penetration depth, then the seeding row unit can maintain proper soil penetration, but the device complexity increases due to additional hydraulic components and control systems
Solution Approach 1:
The patent replaces complex hydraulic depth control systems with a simpler mechanical linkage system. The control rod is directly coupled to the depth control linkage, providing mechanical force transmission without requiring hydraulic cylinders, valves, or fluid pressure management. This mechanical substitution maintains seeding depth control while significantly reducing device complexity.
Solution Approach 2:
The depth control linkage is designed to automatically adjust and maintain seeding depth through its own mechanical structure. The system uses the motion of the control rod and the geometry of the linkage to self-regulate depth, eliminating the need for external hydraulic power sources and complex control systems.
2Stability of the object's composition
If direct linkage between tillage row unit and seeding row unit is implemented, then depth relationship can be maintained, but the device complexity increases due to additional linkages and gauging wheels
Solution Approach 1:
The patent extracts and eliminates the unnecessary direct mechanical linkage between tillage and seeding row units. Instead of coupling the two units together with complex linkages, the invention allows the seeding row unit to be controlled independently through the frame-mounted control rod, removing the need for inter-unit linkages and reducing overall system complexity.
Solution Approach 2:
The control rod mounted on the frame serves multiple functions: it controls both the tillage row unit depth and the seeding row unit depth independently, while also accommodating terrain variations. This universal control mechanism replaces multiple specialized linkages that would otherwise be needed to coordinate the movements of both row units.
3Stability of the object's composition
If frame flexibility is limited to compensate for terrain changes, then structural stability is maintained, but the ability to accommodate terrain variations is reduced
Solution Approach 1:
The patent introduces dynamic adjustment capability through the control rod and linkage system. While the frame itself remains structurally stable, the control rod can move vertically along the frame, and the seeding row unit can adjust its depth independently through the mechanical linkage. This dynamic system allows the implement to adapt to terrain variations without compromising frame structural integrity.
Data Source
AI summary
A planting system including a plurality of seeding row assemblies, each having components maintained at a controlled elevation. The seeding row assembly includes a tillage row unit controlled to maintain a desired elevation relative to a seeding row unit, the seeding row unit being configured to passively follow the local terrain. Each seeding row assembly can include two position sensors that generate signals corresponding to the elevation of the seeding row unit and the ground engagement attachment, respectively, or a differential positon sensor that generates signals corresponding to the difference in the elevations. Various embodiments include a local closed loop controller that adjusts elevation of the tillage row unit relative to the seeding row unit to a desired set point. In some embodiments, the down force of the seeding row unit is actively controlled.