GAS FLOW RATE METER AND GAS FLOW RATE METERING METHOD

• Main Authors: KITAHARA NOBORU, MIZUTANI AKITOSHI
• Format: Patent
• Language: English; Japanese
• Published: 21.11.2019
• Subjects: MEASURING; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PHYSICS; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

To provide a gas flow rate meter that is able to highly accurately correct a voltage output from a flow rate sensor, while reducing storage capacity of a storage unit.SOLUTION: A gas flow rate meter 1 comprises: a flow rate sensor 20 that outputs a voltage V according to a flow rate of air to be measured; a correction coefficient storage unit 52 storing a correction coefficient Mi for correcting an output voltage V of the flow rate sensor 20; and a correction arithmetic unit 51 that, using the correction coefficient Mi, corrects a voltage VD corresponding to the voltage V. The correction coefficient Mi is a coefficient for correcting the voltage VD on the basis of a correspondence relation between the voltage VD and an intake flow rate G, which differs according a difference in external environment and an individual difference of the flow rate sensor 20. In addition, the correction coefficient Mi is a coefficient for correcting at once the voltage VD to an ideal voltage including neither variation caused by a difference in external environment nor variation caused by the individual difference of the flow rate sensor 20.SELECTED DRAWING: Figure 1 【課題】記憶部の記憶容量の低減を図りつつ、流量センサの出力電圧の高精度な補正が可能な気体流量測定装置を提供する。【解決手段】気体流量測定装置１は、測定対象の空気の流量に応じて電圧Ｖを出力する流量センサ２０と、流量センサ２０の出力電圧Ｖを補正するための補正係数Ｍｉを記憶している補正係数記憶部５２と、電圧Ｖに対応する電圧ＶＤを補正係数Ｍｉにより補正する補正演算部５１とを備える。補正係数Ｍｉは、外部環境の違いおよび流量センサ２０の個体差により異なる「電圧ＶＤと吸気流量Ｇとの対応関係」に基づいて電圧ＶＤを補正するための係数である。また、補正係数Ｍｉは、電圧ＶＤを「外部環境の違いによるばらつきを含まず且つ流量センサ２０の個体差によるばらつきを含まない理想電圧」に一度に補正する係数である。【選択図】図１