Autonomous Headland Path Planning for Farm Work Vehicles
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Solution Overview
Problem
Existing autonomous travel systems for work vehicles lack a detailed method for creating paths in headland areas, which have distinct characteristics different from work areas, leading to inefficiencies in autonomous travel.
Innovation Solution
An autonomous travel system that includes a farm field acquisition unit, a reference auxiliary line creation unit, an adjacent auxiliary line creation unit, and a travel control unit, which creates auxiliary lines in the headland area based on specific intervals and offsets relative to the farm field and work area peripheries, allowing the work vehicle to autonomously travel along these lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a work vehicle autonomously travels along a path created for a work area, then the work vehicle can perform work efficiently in the work area, but the path creation method cannot be applied to the headland area which has different characteristics
Solution Approach 1:
The system segments the field into distinct work areas and headland areas, and creates different path types for each: travel paths for work areas and auxiliary lines for headland areas. This segmentation allows each path type to be optimized for its specific functional requirements, resolving the contradiction between work efficiency in work areas and adaptability to headland characteristics.
Solution Approach 2:
The system applies different path creation methods to different spatial zones: work area paths are created based on work machine width and work intervals, while headland auxiliary lines are created based on headland width and specific offsets. This local quality approach ensures each zone has the appropriate path characteristics for its specific function, enabling both work efficiency and headland adaptability.
2Ease of operation
If the work vehicle travels along the farm field peripheral edge in the headland area, then the vehicle can access the headland area, but remaining work occurs because the path does not cover the entire headland area
Solution Approach 1:
The system preliminarily creates multiple parallel auxiliary lines in the headland area before the work vehicle begins operation. These auxiliary lines are positioned at calculated intervals to ensure complete coverage of the headland area. By preparing these paths in advance, the system ensures both vehicle accessibility and complete work coverage without remaining unworked areas.
Solution Approach 2:
The system transitions from a single peripheral path to multiple parallel auxiliary lines distributed across the headland area. This dimensional expansion from one path to multiple paths ensures complete coverage of the two-dimensional headland space, eliminating remaining work areas while maintaining vehicle accessibility.
3Manufacturing precision
If auxiliary lines are created too close to the farm field peripheral edge, then the vehicle can cover the entire headland area, but the work machine may operate outside the work area boundaries
Solution Approach 1:
The system creates auxiliary lines that extend slightly beyond the minimum required coverage, using offset values that ensure complete headland coverage while maintaining a safety margin. The first offset value positions the auxiliary line inward from the peripheral edge, and the second offset value positions it outward from the work area edge, creating a controlled excess that prevents both remaining work and boundary violations.
Solution Approach 2:
The system introduces offset values as intermediary parameters between the farm field peripheral edge and the work area boundary. These offsets act as buffer zones that mediate the positioning of auxiliary lines, ensuring they are close enough to the edge for complete coverage but far enough to prevent operation outside the work area.
4Stability of the object's composition
If the auxiliary line interval is set to the work width, then the paths are evenly distributed, but there is overlap or gap between adjacent work passes
Solution Approach 1:
The system modifies the auxiliary line interval parameter from the simple work width to a calculated value that accounts for overlap or gap requirements. The interval is adjusted by subtracting the overlap amount from the work width or adding the work interval to the work width, ensuring consistent work pitch while maintaining uniform path distribution.
Data Source
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AI summary
This autonomous travel system is provided with a farm field acquisition unit, a reference auxiliary line creation unit, an adjacent auxiliary line creation unit, and a travel control unit. The farm field acquisition unit acquires information regarding a farm field that includes a work area and a headland area. The reference auxiliary line creation unit creates first reference auxiliary lines within the headland area at positions spaced apart from the farm field peripheral edge on the inner side thereof by a first reference interval. The adjacent auxiliary line creation unit creates, at each of auxiliary line intervals, first adjacent auxiliary lines at positions spaced apart from the first reference auxiliary lines on the inner sides thereof. The total number of first reference auxiliary lines and first adjacent auxiliary lines created on the inner side of one predetermined side of the farm field peripheral edge is a value obtained by rounding up to a value equal to or less than the decimal of the headland width L/the auxiliary line interval S. The travel control unit causes a work vehicle to travel autonomously along at least some of the first reference auxiliary lines and the first adjacent auxiliary lines.