Work Implement Moment Estimation Using Multi-Attitude Payload Balance
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Solution Overview
Problem
The accuracy of computing load weight in work machines is hindered by the difficulty in measuring designed values of weight and center of gravity position for link members, leading to inaccuracies in moment estimation.
Innovation Solution
A method is proposed to estimate the moment of a work implement by setting the work implement to specific attitudes, obtaining payload computation values, and adjusting the weight of link members to ensure equality of these values across different attitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If actual measurement of weight and center of gravity position of link members is performed, then accuracy of load weight computation is improved, but measurement difficulty and time consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-establishing the relationship between work implement attitudes and moment values through computational modeling. Instead of performing actual measurements during operation, the system pre-calculates moment values for various attitudes based on the moment balance equation, storing them for quick retrieval and comparison during actual load weight computation.
Solution Approach 2:
The patent replaces the mechanical measurement system with a computational system. Instead of physically measuring weight and center of gravity positions of link members, the system uses computational methods to calculate moment values based on geometric relationships and the moment balance equation, substituting physical measurement with mathematical computation.
2Ease of manufacture
If designed values of weight and center of gravity position are used, then computation process is simplified, but accuracy of moment estimation deteriorates
Solution Approach 1:
The system performs self-service by automatically adjusting and optimizing the moment values through iterative computation. The control unit compares computed load weights from different attitudes and refines the moment values accordingly, allowing the system to self-correct and improve accuracy without external intervention or actual physical measurements.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the moment values of link members based on computed results from different work implement attitudes. The system modifies these parameters iteratively to minimize discrepancies in load weight computations, thereby improving accuracy while maintaining computational simplicity.
3Measurement precision
If multiple attitudes are measured to improve accuracy, then load weight computation accuracy is enhanced, but time consumption and operational complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing moment values for multiple work implement attitudes before actual operation. This allows the system to quickly retrieve and compare pre-computed values during operation without requiring time-consuming actual measurements for each attitude, thereby maintaining accuracy while reducing time consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for accurate calculation of load weight by accurately estimating the moment of the work implement, even when designed values are unknown, thereby enhancing computational accuracy.
Implementation Method 1
a moment balance equation with a boom pivot fulcrum being defined as a center
Implementation Method 2
weight of loads loaded on the work implement
Data Source
AI summary
A first payload computation value which represents a weight of loads loaded on the work implement in a first attitude is obtained. The first attitude and a second attitude are equal to each other in ratio between a horizontal distance from a position of a center of gravity of a first link member to a base end of the first link member and a horizontal distance from a position of the center of gravity of the loads loaded on the work implement to the base end. A second payload computation value which represents a weight of loads loaded on the work implement in the second attitude is obtained. When the first payload computation value and the second payload computation value are determined as being different from each other, a weight of a second link member is changed and processing above is repeated.