Shape-Aware Shovel Control for Accurate Bucket Weight Detection
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Solution Overview
Problem
Existing methods for detecting the weight of an object loaded on a shovel are inaccurate due to variations in the bucket shape, which affects the position of the center of gravity.
Innovation Solution
A shovel control device that considers the shape of the bucket to calculate the weight of the object, using input from a detection part that varies with the weight in the bucket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If weight detection is performed based on boom cylinder thrust without considering bucket shape, then the detection method is simple, but the weight detection accuracy deteriorates due to variations in center of gravity position
Solution Approach 1:
The system performs preliminary action by obtaining bucket shape information before weight detection, and pre-calculating the relationship between bucket shape and center of gravity position. This allows the detection system to account for shape variations in advance, improving accuracy without adding complex real-time measurement equipment.
Solution Approach 2:
The invention introduces bucket shape information as an intermediary parameter that mediates between the detection system and the weight calculation. By using shape data to determine center of gravity position, the system bridges the gap between simple thrust measurement and accurate weight detection without requiring direct center of gravity measurement equipment.
2Measurement precision
If the center of gravity position is assumed fixed regardless of bucket shape, then the calculation process is simple, but the weight detection accuracy deteriorates
Solution Approach 1:
The invention extracts the center of gravity position determination from the weight detection process by obtaining it separately from bucket shape information. This allows the system to use pre-determined center of gravity data based on shape, avoiding the need for complex real-time center of gravity measurement while improving accuracy.
Solution Approach 2:
The system creates a correspondence relationship (copy) between bucket shape and center of gravity position that can be reused for weight detection. Instead of measuring center of gravity directly each time, the system uses the pre-established shape-to-center-of-gravity mapping to obtain the position information efficiently.
Data Source
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AI summary
A shovel control device according to an embodiment is configured to receive an input of a shape of a bucket provided at a tip of an attachment attached to a shovel, and calculate a weight of an object in the bucket, based on the input shape of the bucket and an output of a detection part whose detection result changes according to the weight of the object in the bucket.