Construction Machine Bucket Control Mode Switching
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Solution Overview
Problem
Existing construction machine control systems fail to automatically switch between shaping and cutting edge aligning modes, leading to involuntary movement of the bucket along the designed surface during cutting edge alignment operations, requiring manual intervention and speed limitation termination.
Innovation Solution
A working unit control system with a work type determining part and drive controlling part that automatically switches between shaping and cutting edge aligning modes by determining the work type based on operation signals, inside pressure, or discharge pressure, and controlling the bucket's movement along a designed surface or stopping it at a predetermined position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If speed limitation is applied to move the bucket along the designed surface, then the bucket follows the target shape accurately, but the operator cannot stop the cutting edge in a predetermined position
Solution Approach 1:
The control system dynamically switches between two operational modes: shaping mode (with speed limitation) and cutting edge aligning mode (without speed limitation). This dynamic mode switching allows the system to adapt to different operational requirements, enabling both precise following of the designed surface and the ability to stop at predetermined positions when needed.
Solution Approach 2:
The system changes the control parameter state by switching between speed limitation enabled (shaping mode) and disabled (cutting edge aligning mode). This parameter change allows the operator to select appropriate control characteristics for different work requirements, resolving the contradiction between precision and flexibility.
2Extent of automation
If automatic speed limitation control is used, then the bucket moves along the designed surface automatically, but manual intervention is required to terminate speed limitation for position setting
Solution Approach 1:
The control system integrates multiple functions into a unified automated control framework. The work type determining part automatically identifies whether shaping work or cutting edge aligning work is required, and the drive controlling part automatically adjusts the speed limitation accordingly. This multi-functionality eliminates the need for manual mode switching while maintaining both automation capabilities.
Solution Approach 2:
The system incorporates feedback through the work type determining part that monitors operational conditions and automatically determines the appropriate work type. This feedback mechanism enables the system to automatically switch between control modes based on actual work requirements, reducing the need for manual intervention and simplifying the control process.
3Measurement precision
If the bucket is stopped in a predetermined position, then the cutting edge can be precisely aligned, but the bucket cannot follow the designed surface continuously
Solution Approach 1:
The control system applies periodic action by alternating between shaping mode (continuous movement along designed surface) and cutting edge aligning mode (stopped position for precise alignment). The system periodically switches between these two states based on work requirements, achieving both continuous productivity and periodic precision positioning.
Data Source
AI summary
A working unit control system includes a working unit, an operating tool, a work type determining part, and a drive controlling part. The operating tool is configured to receive a user operation to drive the working unit, and to output an operation signal in accordance with the user operation. The work type determining part is configured to determine to which of a shaping work and a cutting edge aligning work a work type of the working unit corresponds based on the operation signals. The drive controlling part configured to move the bucket along a designed surface when the work type corresponds to the shaping work, the drive controlling art being configured in a predetermined position set with reference to the designed surface when the work type corresponds to the cutting edge aligning work, the designed surface indicating a target shape of an excavation object.