Dynamic Sensitivity Control for Harvester Header Positioning
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Solution Overview
Problem
Self-propelled harvesting machines face instability and performance degradation due to inappropriate sensitivity settings in their closed loop header position control systems, leading to uneven cutting and operator burden from frequent adjustments in uneven terrain.
Innovation Solution
A dynamic sensitivity control system that automatically identifies a sensitivity level based on header position accuracy and machine stability parameters, adjusting the sensitivity of the header position control system to maintain optimal performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensitivity of the closed loop header position control system is increased to improve header height accuracy, then the header height error reduction responsiveness is improved, but the machine stability deteriorates due to excessive actuator responsiveness causing oscillations
Solution Approach 1:
The patent applies dynamics by making the sensitivity value adjustable and adaptive rather than fixed. The sensitivity control system dynamically modifies the sensitivity based on detected machine stability and header position accuracy, allowing the system to transition between different control aggressiveness levels to maintain both accuracy and stability under varying operating conditions.
Solution Approach 2:
The patent changes the sensitivity parameter of the control system based on detected operating conditions. By monitoring machine stability and header position accuracy, the system adjusts the sensitivity value to optimize the balance between responsive correction and system stability, preventing oscillations while maintaining cutting accuracy.
2Stability of the object's composition
If the sensitivity of the closed loop header position control system is decreased to improve machine stability, then the oscillations are reduced, but the header height accuracy deteriorates due to slower response to position errors
Solution Approach 1:
The system dynamically adjusts sensitivity based on real-time feedback about machine stability and header position accuracy. When stability is good, sensitivity can be increased for faster correction; when instability is detected, sensitivity is reduced to prevent oscillations, thus maintaining both stability and accuracy across different operating conditions.
Solution Approach 2:
The sensitivity parameter is modified based on detected operating conditions. The system monitors machine stability and header position accuracy, then adjusts the sensitivity value to optimize the balance between responsive correction and system stability, preventing oscillations while maintaining cutting accuracy.
3Device complexity
If a fixed sensitivity value is used in the header position control system, then the system structure is simplified, but the adaptability to varying terrain conditions deteriorates requiring frequent operator adjustments
Solution Approach 1:
The system performs self-adjustment by automatically detecting machine stability and header position accuracy, then selecting appropriate sensitivity values without operator intervention. This self-service capability allows the control system to adapt to varying terrain conditions autonomously, eliminating the need for frequent manual adjustments while maintaining reasonable structural complexity.
Solution Approach 2:
The system uses feedback from sensors monitoring machine stability and header position accuracy to automatically adjust the sensitivity value. This closed-loop feedback mechanism enables the system to adapt to changing terrain conditions in real-time, improving versatility without requiring complex manual intervention systems.
4Adaptability or versatility
If the operator manually adjusts the sensitivity value frequently to maintain optimal performance on uneven terrain, then the adaptability to terrain conditions is improved, but the operator workload increases
Solution Approach 1:
The system automatically detects terrain conditions through sensors monitoring machine stability and header position accuracy, then self-adjusts the sensitivity value without requiring operator action. This eliminates the burden of frequent manual adjustments while maintaining optimal adaptability to varying terrain conditions.
Solution Approach 2:
The system uses continuous feedback from sensors to automatically adjust sensitivity based on detected terrain conditions. This automated feedback loop maintains optimal performance across varying terrain without increasing operator workload, as the system handles adjustments autonomously.
Data Source
AI summary
The height of a header of a self-propelled harvesting machine is controlled by a closed loop header position control system. A sensitivity control system receives parameters related to header position error (e.g., an accuracy parameter) and machine stability (e.g., a stability parameter) and automatically identifies a sensitivity metric indicative of a sensitivity with which the header position control system controls the header height, based upon the received parameters. The sensitivity metric is provided to the header position control system. The header position control system performs closed loop header position control with a sensitivity level based upon the sensitivity metric provided by the sensitivity control system.