Work Machine Calibration Using Position Correction Candidates
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Solution Overview
Problem
The accuracy of position detection in work machines, such as hydraulic excavators, is limited by the tolerance of design parameters used for calculating the position of specific portions from a reference position, necessitating improved calibration methods to enhance detection precision.
Innovation Solution
A method and system that involve acquiring true values and reference positions, determining correction candidate values for parameters, calculating assessment values to evaluate differences, and determining confirmation correction values to refine parameter calibration, thereby improving the accuracy of position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automatic calibration is performed by comparing calculated position with measured position, then position detection accuracy is improved, but further improvement of accuracy is limited
Solution Approach 1:
The patent applies preliminary action by determining multiple correction candidate values before final selection. The system pre-calculates several possible correction values based on the difference between measured and calculated positions, then evaluates each candidate to select the optimal correction that maximizes position detection accuracy.
Solution Approach 2:
The patent implements parameter changes by systematically varying correction values for calibration parameters. The system generates multiple correction candidate values by adjusting parameters within their tolerance ranges, evaluates each set of corrected parameters, and selects the combination that yields the best position detection accuracy.
2Ease of manufacture
If design parameters with tolerance are used for calculation, then manufacturing ease is improved, but position detection accuracy deteriorates
Solution Approach 1:
The patent applies self-service by enabling the system to automatically calibrate itself using available measurement data. The work machine's own position detection system and measurement device work together to identify and correct parameter deviations, eliminating the need for external manual calibration while maintaining manufacturing tolerances.
Solution Approach 2:
The patent implements feedback by continuously comparing the position calculated from design parameters with the actual measured position. This feedback loop identifies parameter deviations and triggers automatic calibration, allowing the system to compensate for manufacturing tolerances and maintain high position detection accuracy.
Data Source
AI summary
A first process acquires a true value of the position of a predetermined portion. A second process acquires a reference position of a work machine. A third process determines a plurality of correction candidate values of a parameter. The correction candidate values are used so that a calculation value of the position of the predetermined portion calculated based on the parameter from the reference position matches the true value. A fourth process calculates an assessment value indicative of the difference between the true value and a calculation value for each of plurality of correction candidate values. A fifth process determines a confirmation correction value of the parameter from among the plurality of correction candidate values based on the assessment value.