Work Machine Control System for Discontinuous Shape Positioning
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Solution Overview
Problem
In work machine control systems, positioning a tilting bucket on a target construction shape is challenging, especially when the target shape is discontinuous, as the bucket may tilt beyond the desired surface, leading to inaccurate placement.
Innovation Solution
A work machine control system that generates a target construction shape and calculates a control target shape, with an extended target shape for bucket rotation control, using a determination unit to decide whether to use the extended target shape based on distance, overlap, and attitude, ensuring precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bucket performs a tilting operation to position on a discontinuous target construction shape, then the bucket can reach surfaces on opposite sides, but the bucket may tilt beyond the desired surface and fail to position accurately
Solution Approach 1:
The patent divides the target construction shape into multiple continuous segments by generating an extended target construction shape that fills discontinuous portions. This segmentation allows the control system to treat each segment as a continuous surface, enabling accurate bucket positioning without over-tilting while maintaining adaptability to complex construction geometries.
Solution Approach 2:
The patent introduces an extended target construction shape as an intermediary between the actual discontinuous target shape and the bucket positioning control. This virtual extended shape serves as a mediator that provides continuous reference surfaces for control calculations, allowing the bucket to be guided accurately to discontinuous target portions without exceeding desired tilt angles.
2Device complexity
If the control system uses only the actual target construction shape for bucket control, then the control logic is simple, but the bucket cannot be accurately positioned on discontinuous target portions
Solution Approach 1:
The patent applies preliminary action by generating the extended target construction shape before the bucket positioning control is executed. This pre-processing step creates a complete continuous reference surface that incorporates all discontinuous target portions, allowing the subsequent control system to operate with enhanced accuracy without requiring complex real-time calculations or additional hardware.
3Manufacturing precision
If the bucket is restricted from over-tilting to maintain positioning accuracy, then the bucket can be precisely positioned, but the bucket cannot reach surfaces on opposite sides of discontinuous portions
Solution Approach 1:
The patent resolves this contradiction by adding a virtual dimension through the extended target construction shape. Instead of restricting the bucket's physical tilting range, the system creates a virtual continuous surface that extends beyond discontinuous portions, allowing the control system to guide the bucket to target locations that would otherwise require over-tilting, thereby maintaining both accuracy and effective working range.
Data Source
AI summary
A work machine control system that controls a work machine including a working device having a working tool that rotates about a shaft line includes: a target construction shape generation unit that generates a target construction shape indicating a target shape of a construction target of the work machine; a target shape calculation unit that calculates a control target shape which is a target shape when controlling rotation of the working tool from the target construction shape and calculates an extended target shape obtained by extending the control target shape; and a working device control unit that controls the rotation of the working tool about the shaft line based on a distance between the working tool and the control target shape and the extended target shape.