Planter Row Unit Downforce Control via Ground View Sensor
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Solution Overview
Problem
Existing seeding machines face challenges in maintaining consistent seed depth in the furrow, which affects crop yield uniformity due to factors like furrow opener wear and independent movements of gauge wheels, making it difficult to reliably determine and adjust the actual furrow depth.
Innovation Solution
A row unit for a seeding machine equipped with a ground view sensor that directly measures furrow depth and generates depth signals, coupled with a controller that adjusts downforce using these signals to maintain a set point depth, ensuring consistent seed placement through a closed-loop system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional gauge wheel-based depth control is used, then the system structure is simple, but the furrow depth measurement and control precision deteriorates due to gauge wheel independent movements and furrow opener wear
Solution Approach 1:
The patent replaces the traditional mechanical gauge wheel-based depth measurement system with an optical sensor system. The optical sensor directly measures furrow depth by detecting the bottom of the furrow, eliminating the need for mechanical gauge wheels that are affected by wear and independent movements. This substitution of mechanical measurement with optical measurement resolves the contradiction by providing higher measurement precision while maintaining reasonable system complexity through the use of a dedicated optical sensing mechanism.
Solution Approach 2:
The patent implements a closed-loop feedback control system where the optical sensor continuously measures actual furrow depth and feeds this information back to the controller. The controller then adjusts the downforce application mechanism accordingly to maintain the desired set point depth. This feedback mechanism resolves the contradiction by enabling precise real-time depth control that compensates for furrow opener wear and soil variations, improving measurement and control precision without requiring overly complex mechanical adjustments.
2Reliability
If downforce is increased to ensure adequate furrow opening, then the furrow opening reliability improves, but the seed depth control precision deteriorates due to excessive compression on the furrow closer
Solution Approach 1:
The patent implements dynamic downforce adjustment where the application force is not fixed but varies based on real-time furrow depth measurements from the optical sensor. The controller dynamically modifies the downforce to maintain optimal conditions for both furrow opening and seed depth control. This dynamic approach resolves the contradiction by allowing the system to adapt the downforce level to actual soil conditions, ensuring reliable furrow opening while preventing excessive compression that would compromise seed depth precision.
Solution Approach 2:
The patent changes the downforce parameter dynamically based on measured furrow depth conditions. By adjusting the downforce parameter in response to optical sensor feedback, the system optimizes the balance between furrow opening reliability and seed depth control precision. This parameter adjustment resolves the contradiction by allowing the system to apply sufficient force for reliable opening when needed while reducing force to maintain precise seed depth control when conditions permit.
3Productivity
If manual depth adjustment is used, then the device complexity is low, but the productivity and operational efficiency deteriorate due to frequent manual interventions
Solution Approach 1:
The patent implements an automated feedback control system where the optical sensor continuously monitors furrow depth and the controller automatically adjusts the downforce application mechanism without manual intervention. This closed-loop automated control resolves the contradiction by eliminating the need for frequent manual depth adjustments, thereby improving planting operation efficiency and productivity. The system maintains appropriate complexity through the use of an automated control algorithm that processes sensor data and executes adjustments continuously during operation.
Solution Approach 2:
The system performs self-adjustment of furrow depth control parameters based on real-time optical sensor measurements. The controller automatically compensates for furrow opener wear, soil variations, and other conditions without requiring operator intervention. This self-service capability resolves the contradiction by improving operational efficiency and productivity through continuous automatic adjustment, while the complexity is managed through integrated control logic that operates autonomously during the planting process.
Data Source
AI summary
A row unit for a seeding machine includes a ground view sensor coupled to the frame. The ground view sensor is operable to sense the furrow and generate depth signals corresponding to actual sensed depth of the furrow. The row unit also includes a controller configured to receive the signals, and a downforce adjustment mechanism coupled to the frame and to the controller. The controller is configured to activate the downforce adjustment mechanism to adjust a downforce on the frame based on the signals received by the controller.