Construction Machine Control System Bucket Type Adaptation
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Solution Overview
Problem
The change in bucket weight affects the load on the hydraulic cylinder, leading to a decrease in excavation accuracy as the hydraulic cylinder may not execute its intended operation effectively.
Innovation Solution
A construction machine control system that includes a hydraulic cylinder, a direction control valve, a control valve, a storage unit for correlation data, and an acquiring unit to adjust the operation command value based on the bucket type, ensuring accurate operation by correlating cylinder speed with the operation command value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bucket with a different weight is connected to the arm, then the load on the hydraulic cylinder changes, but the hydraulic cylinder cannot execute the intended operation, leading to decreased excavation accuracy
Solution Approach 1:
The control system dynamically adjusts the operation command value for the hydraulic cylinder based on the detected bucket type. When a different bucket is attached, the system changes the control parameters to match the new load characteristics, enabling the hydraulic cylinder to maintain precise control despite weight variations
Solution Approach 2:
The system stores multiple correlation data sets corresponding to different bucket types, each containing the relationship between cylinder speed and operation command values. When a bucket type change is detected, the system switches to the appropriate correlation data, effectively changing the control parameters to match the new bucket's weight and operational characteristics
2Manufacturing precision
If the operation command value is adjusted based on bucket type, then excavation accuracy is maintained, but the control system complexity increases due to multiple correlation data sets
Solution Approach 1:
The system pre-stores multiple correlation data sets in the storage unit, each corresponding to a specific bucket type. This preliminary preparation allows the control unit to quickly switch between different control parameters without real-time calculations, simplifying the control logic while maintaining precision
Solution Approach 2:
Instead of creating a complex real-time calculation system, the patent uses simplified copies of correlation data for different bucket types. Each correlation data set is a pre-computed lookup table that maps operation command values to cylinder speeds, replacing complex physics-based calculations with simple data retrieval and interpolation
Data Source
AI summary
A construction machine control system for a construction machine that includes a work machine including a boom, an arm, and a bucket includes: an adjusting device having a movable spool and being capable of adjusting an amount of operating oil supplied to a hydraulic cylinder that drives the work machine with movement of the spool; an operation command unit adjusting the spool; a storage unit storing a plurality of pieces of correlation data indicating a relation between a cylinder speed of the hydraulic cylinder and an operation command value of operating the hydraulic cylinder according to a type of the bucket; an acquiring unit acquiring type data indicating the type of the bucket; and a control unit selecting one piece of correlation data from the plurality of pieces of correlation data based on the type data and controlling the operation command value based on the selected correlation data.