Work Machine Control Device for Slope Excavation
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Solution Overview
Problem
The operation of forming a slope in construction machines is complicated due to the need for multiple target profiles and processes, including excavation and compaction, which requires operators to set multiple profiles and manage complex operations.
Innovation Solution
A control device and method for a work machine that defines an offset profile separated by a predetermined distance from the target excavation profile based on the working implement's attitude, preventing the implement from crossing the target profile during excavation, thereby simplifying the operation by switching between offset and target profiles automatically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple target profiles are set for excavation and compaction operations, then the slope formation precision is improved, but the operation complexity increases
Solution Approach 1:
The target profile is segmented into multiple sections (first target profile for excavation, second target profile for compaction) along the travel direction. This allows different operational phases to have distinct target profiles, improving slope formation precision while the automated switching reduces operation complexity
Solution Approach 2:
The control device dynamically switches between the first and second target profiles based on the working implement's position and attitude. This dynamic adaptation allows the system to automatically adjust the target profile according to the current operational phase, resolving the contradiction between precision and complexity
2Manufacturing precision
If the working implement is controlled not to cross the target profile, then the excavation precision is improved, but the productivity decreases
Solution Approach 1:
The system allows the working implement to temporarily exceed the first target profile during excavation by a predetermined distance (compaction allowance), then compensates by pressing the material back to the exact target position. This partial excess action improves excavation efficiency while maintaining final precision
Solution Approach 2:
The compaction allowance is predetermined and built into the control strategy before excavation begins. The system pre-calculates the acceptable deviation and compensates for it in advance, allowing faster excavation without sacrificing final precision
3Ease of operation
If automated switching between offset and target profiles is implemented, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The control device automatically monitors the working implement's position and attitude, and autonomously switches between the offset profile and target profile without operator intervention. The system serves itself by making the switching decisions, improving ease of operation while the added control logic increases device complexity
Data Source
AI summary
A control device for a work machine is a device for controlling a working unit of a work machine to excavate an object to be excavated. The control device includes a control unit for controlling the working unit to prevent a working implement of the working unit from crossing a predetermined target profile, and a switching unit for defining the target profile as an offset profile separated by a predetermined distance from a target excavation profile that is a target profile for finishing of the object to be excavated or the target excavation profile, based on an attitude of the working implement relative to the target excavation profile.