Forestry Loader Weighing Correction via Unloading Reference
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Solution Overview
Problem
Existing forestry weighing systems face inaccuracies in measuring the mass of energy timber bundles during loading due to their irregular shape and dynamic motion, leading to errors in weighing and requiring frequent recalibration with a heavy test weight, which is cumbersome and unreliable.
Innovation Solution
A method that uses the accurate unloading mass as a reference to calculate a correction factor for the loading mass, adjusting the weighing system to improve precision by comparing the mass measured during loading and unloading, and applying this correction factor to subsequent loads, potentially using filtering to reduce noise and adapt to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a loader weigher is used to weigh bundles during loading, then mass-based measurement is enabled for timber procurement, but measurement accuracy deteriorates due to dynamic motion and irregular bundle shapes
Solution Approach 1:
The patent inverts the traditional calibration approach by using unloading weighings (which are accurate) to correct loading weighings (which are inaccurate). Instead of using loading data to calibrate the system, the method uses the reverse process data as the reference truth to adjust and correct the loading measurements, thereby resolving the accuracy-reliability contradiction.
Solution Approach 2:
The patent implements a feedback mechanism where unloading weighing results are fed back to adjust and correct loading weighing measurements. The system continuously uses the accurate unloading data to refine and improve the loading measurements, creating a closed-loop correction system that maintains measurement reliability despite dynamic conditions.
2Measurement precision
If frequent recalibration with a heavy test weight is performed to improve weighing accuracy, then measurement precision is improved, but operation complexity and time consumption increase
Solution Approach 1:
The system performs self-calibration using its own unloading weighing operations as the reference standard. Instead of requiring external test weights and manual intervention, the system automatically uses its normal unloading operations to correct and adjust its loading measurements, eliminating the need for separate recalibration procedures and heavy test weights.
Solution Approach 2:
The patent makes the unloading weighing operation serve dual purposes: it performs the necessary unloading function while simultaneously serving as the calibration reference for improving loading measurement accuracy. This multi-functionality eliminates the need for separate test weights and recalibration procedures.
3Measurement precision
If a test weight is used for check weighing to adjust the loader weigher, then weighing accuracy is improved, but device complexity and operational burden increase
Solution Approach 1:
The system uses its own unloading operations as the self-reference standard for calibration, eliminating the need for external test weights. The system automatically performs the adjustment using its normal operational data, requiring no special test equipment or additional operational steps from the user.
Solution Approach 2:
The patent extracts the calibration reference function from external test weights and embeds it within the system's own unloading weighing operations. By taking out the dependency on external calibration artifacts and using the system's inherent unloading data as the reference, the method simplifies operation while maintaining accuracy.
Data Source
AI summary
The invention relates to a method in a weighing system, in which method the mass of the bundle is weighed and recorded during both loading % and unloading mi_p of the bundle, during loading, the total loading mass mK_kok_j is calculated from the mass mi_c of one or more bundles weighed during loading and corrected using a correction factor Cj, the total unloading mass mp_kok_j is calculated from the mass mi_p of one or more bundles weighed during unloading, with the aid of the said total loading mass mK_COk_j and total unloading mass mp_kok_j′, a new corrected value Cj+1 is calculated for the correction factor Cj in order to adjust the weighing for the loading of the next load Kj+1. The invention also relates to a corresponding software product, an arrangement, and a material-handling machine.