Harvester Height Control via Frequency-Segmented Actuation
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Solution Overview
Problem
Current automatic header height control systems for agricultural harvesters fail to maintain a consistent cutting height across varying field topography, leading to inefficiencies in crop harvesting.
Innovation Solution
A system comprising first and second actuators and a computing system that adjusts the harvesting implement's height and orientation based on sensor data, dividing the implement height error signal into low and high frequency portions to control the actuators, allowing for larger adjustments with the lift actuator and smaller, frequent adjustments with the tilt actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single actuator is used to control harvesting implement height, then the device complexity is reduced, but the ability to maintain consistent cutting height across varying field topography deteriorates
Solution Approach 1:
The control system segments the height error signal into low-frequency and high-frequency components, assigning each to different actuators with specialized functions. The lift actuator handles large adjustments based on low-frequency signals, while the tilt actuator handles small adjustments based on high-frequency signals, achieving precise cutting height consistency through functional segmentation.
2Adaptability or versatility
If the harvesting implement makes large adjustments to maintain cutting height, then the adaptability to field topography is improved, but the response time deteriorates
Solution Approach 1:
The control system segments the adjustment task into two pathways: the lift actuator handles large, slow adjustments for adaptability to major topography changes, while the tilt actuator handles small, fast adjustments for rapid response to minor variations. This segmentation allows the system to simultaneously achieve both adaptability and fast response time.
Solution Approach 2:
The system dynamically assigns different control functions to different actuators based on the frequency content of the error signal. The lift actuator responds to low-frequency components for gradual adaptability, while the tilt actuator responds to high-frequency components for rapid response, creating a dynamic adjustment mechanism that optimizes both adaptability and speed.
3Speed
If the harvesting implement uses frequent small adjustments, then the response time is improved, but the energy consumption deteriorates
Solution Approach 1:
The control system segments the adjustment workload by frequency: the tilt actuator handles frequent small adjustments driven by high-frequency error components, while the lift actuator handles less frequent large adjustments driven by low-frequency components. This segmentation allows the system to maintain fast response time through targeted small adjustments while reducing overall energy consumption by avoiding unnecessary large adjustments.
Data Source
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AI summary
A system for controlling harvesting implement height of an agricultural harvester may include a computing system configured to monitor the height of a harvesting implement of the harvester relative to a field surface based on the received sensor data. Additionally, the computing system may be configured to determine an implement height error signal by comparing the monitored height of the harvesting implement to a predetermined target height. Moreover, the computing system is configured to divide the determined implement height error signal into a first and second frequency portions, with the second frequency portion having a greater frequency than the first frequency portion. Furthermore, the computing system is configured to control the operation of first and second actuators of the harvester based on the first and second frequency portions of the implement height error signal, respectively.