Header Lateral Tilt Control with Automatic Mode Switching
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Solution Overview
Problem
Existing automatic systems for controlling lateral tilt and height of agricultural machine headers suffer from slow response to changing terrain conditions, particularly at higher travel speeds and with wider headers, leading to non-uniform cut height and potential damage.
Innovation Solution
An automatic lateral tilt control system that switches between free float and controlled tilt modes based on monitored conditions, using gauge wheels or skids to follow ground contours and adjust header tilt with a hydraulic cylinder, while allowing limited resilient movement to dampen terrain irregularities, and actively or passively varying damping to maintain uniform cut height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If automatic tilt control systems are used to maintain uniform cut height, then cut height uniformity is improved, but response speed to terrain changes deteriorates
Solution Approach 1:
The system dynamically switches between two operational modes: free float mode for rapid response to terrain changes, and controlled tilt mode for maintaining uniform cut height. This dynamic mode switching allows the system to optimize between response speed and cut height uniformity based on real-time operating conditions, resolving the contradiction between these two parameters.
Solution Approach 2:
The system changes the control parameter state by transitioning between free float (minimal control intervention) and controlled tilt (active control intervention). This parameter change allows the system to adapt its response characteristics, providing fast response when needed while maintaining precision when operational conditions permit.
2Manufacturing precision
If controlled tilt mode is used to maintain uniform cut height, then cut height uniformity is improved, but system lag increases
Solution Approach 1:
The system employs periodic monitoring of terrain conditions and operational parameters, switching between free float and controlled tilt modes based on sensed conditions. This periodic assessment allows the system to minimize controlled intervention (reducing lag) while maintaining cut height uniformity when necessary.
Solution Approach 2:
In free float mode, the header serves itself by naturally following terrain contours through gauge wheels, eliminating the need for active control system intervention. This self-service approach minimizes system lag while maintaining adequate cut height uniformity under favorable conditions.
3Speed
If free float mode is used to reduce system lag, then response speed is improved, but control precision over rough terrain deteriorates
Solution Approach 1:
The system continuously monitors terrain conditions, header position, and operational parameters, using this feedback to determine when to switch from free float to controlled tilt mode. This feedback mechanism ensures that the system maintains response speed while activating control precision when terrain conditions or operational parameters indicate a need for uniformity.
Solution Approach 2:
The system dynamically adjusts its control strategy based on real-time conditions, transitioning between free float and controlled tilt modes. This dynamic adaptation allows the system to optimize response speed when terrain is favorable while maintaining cut height uniformity when terrain complexity or operational conditions require it.
4Adaptability or versatility
If gauge wheels are allowed to move freely to follow terrain contours, then terrain following capability is improved, but rapid movements over rough terrain increase
Solution Approach 1:
The system provides beforehand cushioning through controlled tilt intervention when terrain conditions indicate upcoming rough sections or when rapid gauge wheel movements threaten header stability. This proactive control dampens excessive movements while preserving terrain following capability under normal conditions.
Solution Approach 2:
The system monitors gauge wheel position, header tilt angle, and terrain conditions in real-time, using this feedback to determine when to intervene with controlled tilt to dampen rapid movements. This feedback-based approach maintains terrain following capability while stabilizing the header when rough terrain conditions are detected.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system significantly reduces response lag and ensures accurate, uniform cut height across wider headers at high travel speeds by allowing the header to freely tilt in response to ground contours and activating control mode as needed, minimizing system lag and maintaining desired cut height.
Implementation Method 1
an electro-hydraulic or mechanical apparatus for controlling the lateral tilt
Implementation Method 2
apparatus or mechanisms which allow limited resilient upward and downward relative movements of the gauge wheels or skids and the lateral ends
Implementation Method 3
actively or passively damped to provide desired uniformity of plant cut height
Data Source
AI summary
A method and system for controlling lateral tilt of a header of an agricultural machine, uses gauge wheels or skids on lateral ends of the header in combination with operation in a free float mode for maintaining uniform cut height across the header, and automatically changes to a controlled tilt mode when one or more conditions for that mode is present. During operation in the controlled tilt mode, if a condition or conditions for free float is present, the system will operate in that mode. The system can also optionally damp relative up and down movements of the gauge wheels or skids and the header on each end, and can limit the tilt in the free float mode.