Agricultural Machine Row Unit Height Control
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Solution Overview
Problem
Existing agricultural machines face challenges in accurately and efficiently controlling the operating depth of tools relative to the soil surface, especially when encountering varying soil conditions and uneven terrain.
Innovation Solution
The agricultural machine incorporates a frame with movable row units, an actuator for adjusting the row unit height, and a ground sensor to provide a ground distance signal, enabling predictive implement height control to maintain consistent tool depth across different terrain conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional depth control mechanisms are used, then the structure remains simple, but the operating depth control precision deteriorates under varying terrain conditions
Solution Approach 1:
The system performs preliminary measurement of ground distance using sensors (ultrasonic, LIDAR, radar, or gauge wheels) before the row units engage the terrain. This advance information allows the control system to pre-adjust actuator positions, ensuring accurate depth control is achieved before actual ground contact occurs, resolving the contradiction between precision and complexity.
Solution Approach 2:
The system implements continuous feedback loops where sensors monitor ground distance and row unit position, the control system processes this data, and actuators adjust in real-time to maintain desired operating depth. This closed-loop feedback mechanism enables precise depth control despite varying terrain, while the modular architecture manages system complexity.
2Productivity
If manual depth adjustment is used, then the system remains simple to operate, but the productivity deteriorates due to inefficiency in responding to terrain changes
Solution Approach 1:
The system performs self-adjustment of row unit depths automatically based on sensor data and control algorithms. The actuators independently modify positions without operator intervention, enabling the machine to adapt to terrain changes in real-time. This self-service capability dramatically improves productivity while reducing operator workload to simple monitoring and parameter setting.
3Adaptability or versatility
If fixed depth engagement is used, then the mechanism remains simple, but the adaptability deteriorates when encountering varying soil conditions
Solution Approach 1:
The system transitions from fixed depth engagement to dynamic adjustment. Sensors continuously measure ground distance and row unit position, the control system processes this data in real-time, and actuators dynamically modify row unit depths to maintain optimal engagement with varying terrain. This dynamic capability provides terrain adaptability while the modular architecture manages complexity.
Solution Approach 2:
The system divides the depth control function into independent segments - each row unit can be adjusted individually or in groups based on local terrain conditions. This segmentation allows selective adaptation to varying soil conditions without requiring complex coordinated adjustment of all row units, managing overall system complexity while improving adaptability.
Data Source
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AI summary
An agricultural machine (100) is disclosed. The agricultural machine may comprise: a frame (202); a set of frame support elements (205) supporting the frame (104); a set of row units (206) mounted to the frame (202) and movable relative to the wheels to change a depth of engagement of the row units (206) with the ground over which the agricultural machine (100) travels; at least one actuator (210) that drives movement of the set of row units (206) relative to the frame (202); a ground sensor (214) operably coupled to the agricultural machine (100) and configured to provide a ground distance signal; and row unit height control logic (276) that is configured to receive the ground distance signal and provide a control output to the at least one actuator (210) to generate a height value of the row units (206) relative to ground. Further a method of providing predictive implement height control for an agricultural machine (100) is disclosed.