Weighing Control for Accurate Zero-Point Adjustment Under Sudden Noise
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Solution Overview
Problem
Existing weighing apparatuses struggle to accurately adjust the zero point due to the inclusion of sudden noise in the filtering process, leading to deviations from the real zero point, especially when filtering processes are prolonged.
Innovation Solution
A weighing apparatus that determines whether to adjust the zero point based on a first filter with higher responsiveness, generating an adjustment signal using a second filter with more stages to remove noise, and adjusts the zero point only after ensuring the signal is free from sudden noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a multi-stage filtering process is applied to the original signal for zero point adjustment, then the adjustment accuracy is improved, but the responsiveness to the original signal decreases and sudden noise may be included in the adjustment
Solution Approach 1:
The patent divides the filtering process into two separate stages: a first filtering process that processes the original signal to generate a determination signal for noise detection, and a second filtering process that generates the adjustment signal for zero point correction. This segmentation allows each filter to be optimized for its specific purpose, resolving the contradiction between adjustment accuracy and noise inclusion.
Solution Approach 2:
The determination signal acts as an intermediary between the original signal and the adjustment signal. It serves as a gatekeeper that identifies whether sudden noise is present, thereby preventing noise from being included in the zero point adjustment while still allowing accurate adjustment when conditions are favorable.
2Measurement precision
If the filtering process is performed for a longer period to improve zero point adjustment accuracy, then more noise may be included in the adjustment, causing the adjusted zero point to deviate from the real zero point
Solution Approach 1:
The patent performs preliminary noise detection through the first filtering process before executing the main zero point adjustment through the second filtering process. This preliminary action identifies the presence of sudden noise in advance, allowing the system to avoid performing adjustment when noise is detected, thus preventing noise from affecting the adjustment accuracy.
Solution Approach 2:
The determination signal provides feedback about the quality of the original signal by detecting sudden noise. This feedback mechanism allows the system to make informed decisions about whether to proceed with zero point adjustment, thereby preventing harmful noise from degrading the adjustment accuracy.
Data Source
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AI summary
A weighing apparatus includes: a transport unit capable of transporting an article; a weighing unit connected to the transport unit and configured to output an original signal related to a weight; and a weighing control unit configured to output a weighing value of the article by processing the original signal, wherein the weighing control unit is configured: to determine whether or not to adjust a zero point on the basis of a determination signal obtained by applying a first filter to the original signal; to generate an adjustment signal obtained by applying a second filter having more stages than the first filter to the original signal or the determination signal in a case where it is determined that the zero point is to be adjusted; and to perform adjustment of the zero point on the basis of the adjustment signal.