Gas Cutoff Device Correcting Flow Rate Discrepancies
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Solution Overview
Problem
The existing gas cutoff devices experience errors in calculating the total gas usage due to incorrect handling of change amounts, leading to instability in gas usage patterns and potential delays in closing the gas path, as the sum of held change amounts does not accurately reflect the actual gas usage.
Innovation Solution
The gas cutoff device includes an increase and decrease correction unit that compares the sum of held change amounts with the current flow rate, correcting any discrepancies by adding or subtracting the difference from the greatest change amount, ensuring accurate calculation of usable time and preventing delays in closing the gas path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the nearest change amount is deleted when total gas usage decreases, then the device simplifies management of multiple change amounts, but an error occurs between the total usage amount and the sum of held change amounts
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the relationship between the sum of held change amounts and the actual total gas usage, automatically detecting and correcting discrepancies. When an error is detected, the system generates a correction signal to adjust the held change amounts, ensuring ongoing accuracy without requiring complex manual intervention.
Solution Approach 2:
The system performs self-correction by automatically detecting errors in the held change amounts and adjusting them without external intervention. The correction unit autonomously identifies when the sum of held change amounts diverges from actual usage and autonomously corrects the discrepancy, making the system self-sufficient in maintaining accuracy.
2Device complexity
If the greatest change amount becomes a small value separated from the actual gas appliance usage, then the device simplifies data storage, but the usable time extraction becomes inaccurate leading to delayed gas path closure
Solution Approach 1:
The system continuously verifies whether the greatest held change amount accurately reflects actual gas appliance usage by comparing it with real-time flow rate data. When a discrepancy is detected indicating the greatest change amount has become separated from actual usage, the system generates a correction signal to restore accuracy, ensuring reliable timing for gas path closure.
Solution Approach 2:
The patent implements preliminary verification and correction mechanisms that detect and correct errors before they significantly impact the usable time calculation. By continuously monitoring the relationship between held change amounts and actual usage, the system corrects discrepancies proactively, preventing delayed gas path closure before it occurs.
Data Source
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AI summary
An object of the invention is to avoid a gap between the total using amount of gas and the sum of a plurality of change amounts held in a gas cutoff device. The gas cutoff device includes a flow rate detection unit 11, a flow rate calculation unit 12, an increase and decrease calculation unit 13, an increase and decrease determination unit 14, a valve driving unit 15, a valve 16, an increase and decrease correction unit 17, and a constant increase and decrease correction unit 18. The increase and decrease determination unit 14 acquires a corrected change amount 'G' from the increase and decrease unit 17 or the constant increase and decrease correction unit 18 and adopts the amount as a new change amount 'C'. In this way, it is possible to prevent the using time of gas until the gas path is closed from being lengthened.