Agricultural Implement Height Control via Speed-Adaptive Sensitivity
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Solution Overview
Problem
Current agricultural harvester height control systems become unstable and unsafe when the vehicle slows down, leading to system instability and overcorrections due to high sensitivity settings at reduced speeds.
Innovation Solution
A method and system that monitor the vehicle speed and adjust the sensitivity factor of the height control system, reducing sensitivity when the vehicle speed drops below a predetermined threshold to prevent overcorrections and maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sensitivity setting is increased for responsive agricultural operation, then the system responsiveness is improved, but the system becomes unstable and unsafe when vehicle speed is reduced
Solution Approach 1:
The sensitivity factor is made dynamic by adjusting it based on monitored vehicle speed. When speed exceeds a threshold, the sensitivity factor equals the sensitivity setting; when speed falls below the threshold, the sensitivity factor is reduced to a reduced value. This dynamic adjustment resolves the contradiction by allowing high responsiveness at operating speeds while ensuring stability during turns or stops.
Solution Approach 2:
The system changes the parameter of sensitivity factor based on vehicle speed conditions. By monitoring speed and adjusting the sensitivity factor accordingly, the system transitions between two operational states: high sensitivity during normal operation and reduced sensitivity during low-speed maneuvers, thereby maintaining both responsiveness and stability.
2Reliability
If the sensitivity factor is reduced when vehicle speed drops below threshold, then system stability is improved, but the responsiveness during normal operation may be affected
Solution Approach 1:
The sensitivity factor dynamically switches between two values based on vehicle speed monitoring. During normal operation above the speed threshold, the full sensitivity setting is applied for maximum responsiveness. When speed drops below the threshold indicating a turn or stop, the sensitivity factor automatically reduces to prevent instability, thus maintaining both responsiveness and stability as needed.
3Ease of operation
If automatic header height control is implemented, then operational involvement is reduced, but system complexity increases
Solution Approach 1:
The control system continuously monitors vehicle speed and uses this feedback to automatically adjust the sensitivity factor. This feedback mechanism enables the system to autonomously adapt to changing operating conditions (normal travel vs. turns/stops) without operator intervention, reducing operational involvement while managing complexity through a straightforward speed-based control logic.
Data Source
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AI summary
In one aspect, a method is disclosed for automatically controlling a height of an implement of an agricultural work vehicle relative to a ground surface. The method may include monitoring the height of the implement and a vehicle speed; determining an implement height error by comparing the height of the implement with a predetermined target height; and calculating a sensitivity factor based on a sensitivity setting. When the monitored vehicle speed is greater than a predetermined speed threshold, the sensitivity factor may equal a first constant sensitivity value that is proportional to the sensitivity setting. The method may include reducing the sensitivity factor to less than the first constant sensitivity value when the monitored vehicle speed becomes less than the predetermined speed threshold and adjusting the height of the implement relative to the ground surface based on the implement height error and the sensitivity factor.