Oscillatory Guidance for Agricultural Balers
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Solution Overview
Problem
Current automatic guidance systems for agricultural vehicles, particularly tractors with baler implements, are inadequate for achieving even distribution and density of material in bales, as they cannot automatically maneuver in a back-and-forth pattern along windrows, relying on manual operation and resulting in suboptimal bale size and density.
Innovation Solution
An automated method and system that uses a GPS and automatic guidance system to generate and adjust an oscillatory path for the tractor, based on bale sensor feedback, to ensure even distribution of crop material in the baler chambers, by steering the tractor in a sinusoidal pattern around a predetermined centerline, adjusting the path in response to imbalances detected by bale sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standardized guidance patterns (straight, curved, circular, spiral) are used, then the guidance system is simple to implement, but it cannot accommodate the back-and-forth swath path needed for harvesting narrow windrows
Solution Approach 1:
The guidance system dynamically adjusts the swath path from standardized static patterns to a flexible back-and-forth oscillating pattern. The system calculates and updates the guidance path in real-time based on windrow detection, allowing the tractor to automatically maneuver back and forth along narrow windrows while maintaining even material distribution in the baler chambers.
2Productivity
If manual steering operation is used, then the operator can adjust material distribution, but the operation is time-consuming and results in suboptimal bale size and density
Solution Approach 1:
The system incorporates sensors that detect the position of the windrow and the amount of material in the baler chambers, providing real-time feedback to the guidance system. This feedback loop enables the automatic steering system to adjust the swath path dynamically, ensuring even material distribution and optimal bale density without requiring manual operator intervention.
Solution Approach 2:
The guidance system performs the steering function automatically without requiring continuous manual operation. The system self-adjusts the swath path based on sensor input, enabling the tractor to autonomously navigate the back-and-forth pattern and maintain optimal material distribution, thereby improving both productivity and precision.
3Manufacturing precision
If the tractor follows a straight centerline path, then the guidance is simple, but the material distribution in the baler chambers becomes uneven
Solution Approach 1:
Instead of following a symmetric straight centerline path, the system employs an asymmetric back-and-forth oscillating path. The swath path deviates deliberately from the centerline, creating asymmetric left and right excursions that ensure material is evenly distributed across both baler chambers. This asymmetric path calculation compensates for the natural tendency of material to accumulate unevenly during straight-line harvesting.
Data Source
Figure 1~1A
Figure 2~4
Figure 5
AI summary
An automated method and system includes an automatic guidance system (AGS) (24) and swath pattern (18). The AGS (24) steers a vehicle (11) towing a rotary baler (10) in an "S", or oscillatory pattern (30) around a predetermined approximate centerline (12) of the swath path. The oscillatory pattern (30) may be user defined. By steering the vehicle (11) in an oscillatory pattern referenced to the A-B line, a windrow (18) of crop material (16) may be distributed into an even and optimal bale size and density by the baler (10). Bale chamber sensors (45) detect an imbalance of crop density and in response, AGS (24) adjusts an interval or amplitude of oscillatory pattern.