K-Turn Path Control for Farm Vehicle Headland Turns
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Solution Overview
Problem
Existing guidance systems for farm vehicles require significant headland area for turning, reducing crop-growing space and increasing the risk of collisions with obstructions.
Innovation Solution
The implementation of an automatic K-turn guidance system that uses a combination of GNSS and INS to steer vehicles in a series of turns, minimizing the headland area required for a 180-degree turn, by planning paths with varying curvatures and curvature rates to efficiently maneuver the vehicle back onto the next adjacent row.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional turning methods are used at the end of rows, then the vehicle can complete the turn, but the headland area required is large, reducing crop-growing space
Solution Approach 1:
The turning maneuver is divided into multiple segments: a first curve segment to initiate the turn, a second curve segment to complete the 180-degree rotation, and optional straight segments for positioning. This segmentation allows the vehicle to turn within a smaller headland area by breaking the turn into controlled phases rather than requiring a large single turning space.
Solution Approach 2:
The patent employs curved path segments with varying curvature to execute the turn. The vehicle follows a first curve segment with a first curvature, then a second curve segment with a second curvature, allowing smooth transitions and efficient use of headland space while maintaining vehicle stability and control throughout the maneuver.
2Reliability
If traditional turning methods are used, then the vehicle can turn around, but the risk of collision with obstructions in the headland area increases
Solution Approach 1:
The guidance system pre-calculates the K-turn path segments and vehicle trajectory before execution. By determining the optimal curved path in advance based on vehicle position, orientation, and headland boundaries, the system can guide the vehicle through a collision-free trajectory that minimizes headland usage while avoiding obstructions.
Solution Approach 2:
The system continuously monitors vehicle position and orientation during the turning maneuver and adjusts the guidance commands in real-time. This feedback mechanism ensures the vehicle follows the planned K-turn path accurately, reducing collision risk with obstructions while maintaining the optimized headland area utilization.
3Productivity
If manual turning is used, then the operator has control, but the turning time and efficiency are reduced
Solution Approach 1:
The guidance system autonomously calculates and executes the K-turn maneuver without requiring manual operator intervention. The system self-determines the vehicle's current state, computes the optimal turn path segments, and controls the vehicle through the headland area, significantly improving turning efficiency and productivity while reducing operational complexity for the user.
Data Source
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AI summary
A guidance system may derive a K-turn path when a vehicle reaches an end of a first way line in a field. The guidance system may send the K-turn path to a steering controller to turn the vehicle around in a headland area to the beginning of a second way-line in the field. A first segment of the K-turn path may turn the vehicle along a first path in a forward direction and a second segment of the K-turn path may turn the vehicle along a second path in a reverse direction. A third segment of the K-turn path may turn the vehicle along a third path in the forward direction to a starting location of the second way-line. The K-turn path uses less area than other types of turns reducing the amount of headland used for turning around the vehicle.