Construction Machine Attachment Control for Stable Grounding Force
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Solution Overview
Problem
Existing construction machines, such as hydraulic excavators, face challenges in maintaining a steady pressing force during flat ground preparation due to fluctuations in ground surface conditions and soil quality, making it difficult for unskilled operators to achieve consistent compaction.
Innovation Solution
A controller for construction machines that calculates and maintains a target gravity center velocity for the working attachment, using feedback corrections to ensure a steady compaction force by integrating a control part that adjusts the manipulation signals based on the composite gravity center velocity and compaction work, incorporating sensors and hydraulic systems to stabilize the operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple operation sections are operated independently by separate operation units, then each operation can be controlled precisely, but the overall operation complexity and time consumption increase significantly
Solution Approach 1:
The patent combines multiple independent operation units (crane operation unit, shovel operation unit, and truck operation unit) into a single integrated operation unit. This single operation unit can select and execute different operation patterns (first pattern for crane-shovel coordination, second pattern for shovel-truck coordination) based on the work state, thereby reducing overall system complexity while maintaining precise control over all operation sections through unified management.
2Device complexity
If a single operation unit controls multiple operation sections, then operation complexity is reduced, but the precision and reliability of control decrease
Solution Approach 1:
The operation unit employs dynamic pattern selection capability that adapts to different work states. The control device dynamically switches between the first operation pattern (crane-dump truck coordination) and the second operation pattern (shovel-dump truck coordination) based on real-time conditions such as which operation section is active. This dynamic adaptation maintains high reliability by ensuring the appropriate control pattern is always active for the current operational context.
3Adaptability or versatility
If operation patterns are switched frequently between different work states, then adaptability improves, but system stability and reliability deteriorate
Solution Approach 1:
The system pre-defines two complete operation patterns (first operation pattern for crane-dump truck coordination, second operation pattern for shovel-dump truck coordination) that cover all anticipated work states. By preparing these patterns in advance and selecting between them based on the current work state, the system achieves high adaptability without frequent mid-operation switching, thereby maintaining stability and reliability.
Data Source
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AI summary
A controller (1A) includes a drive part (21S, 5), a posture information acquisition part (31), and a control part (50). The control part (50) calculates a gravity center velocity of a working device (20) on the basis of posture information about the working device (20) detected by the posture information acquisition part (31) and calculates a target gravity center velocity being a target value of the gravity center velocity on the basis of a difference between a grounding work to be exerted to the ground by the working device (20) and a target grounding work, and provides a feedback correction to an instruction signal to make the gravity center velocity approach the target gravity center velocity and inputs the corrected instruction signal into the drive part (21S, 5).