FNR Lever Transfer Function Slope Control for Windrower Precision
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Solution Overview
Problem
Agricultural windrowers face challenges in achieving precise slow-speed movements and maneuvers, particularly during header installation and turning, as existing systems lack sufficient control over speed changes, leading to inefficiencies in complex steering and header management.
Innovation Solution
A FNR lever assembly with a programmable control module and sensors, such as potentiometers, generates transfer function signals with varying slopes to control the propulsion driveline speed, allowing for more precise control by differentiating speed commands based on lever position ranges, enabling smoother and slower movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single speed control range is used for the FNR lever, then the system structure remains simple, but precise slow-speed control during header installation and turning is insufficient
Solution Approach 1:
The FNR lever range of motion is segmented into multiple zones (first range and second range), with each zone having a different transfer function slope. This segmentation allows the system to provide different levels of speed control precision for different operational needs, achieving precise slow-speed control during header installation and turning while maintaining simpler control for normal operations.
Solution Approach 2:
The transfer function slope is made dynamic rather than fixed. The control system automatically adjusts the slope based on the FNR lever position, providing a steeper slope (higher precision) when the lever is in the first range for slow-speed operations, and a gentler slope (lower precision) when in the second range for normal operations. This dynamic adjustment resolves the contradiction by adapting control precision to operational context.
2Speed
If the FNR lever response is made sensitive for all positions, then fast response is achieved, but slow-speed maneuverability during header installation is compromised
Solution Approach 1:
Different regions of the FNR lever travel have different control characteristics applied to them. The first range (typically the initial portion of travel) receives a transfer function with a gentler slope that produces slower driveline speeds, while the second range (remaining travel) receives a steeper slope for faster response. This local differentiation of control quality allows slow-speed maneuverability when needed while maintaining fast response capability for normal operations.
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 solution provides enhanced precision and control during slow-speed operations, facilitating better header installation and turning maneuvers by reducing speed command magnitude and change rate within specific lever position ranges, thereby improving operational efficiency.
Implementation Method 1
which sensor is preferably a potentiometer
Data Source
AI summary
The apparatus and method of the invention vary the sensitivity slope of the FNR control lever of an agricultural windrower, such that speed commands outputted through a first range of movements of the FNR lever are slower and increase less rapidly than commands outputted through a second range of movements greater than the first range, the first range corresponding to movements in closer proximity to the neutral position of the FNR lever. The different show is achieved by using different slopes for transfer function signals for the first and the second ranges of positions of the FNR lever.