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1. 发明公开

EP1544583A3 Thermal type gas flow measuring instrument 有权
标题翻译：用于测量气体流量的热装置
公开(公告)号：EP1544583A3
公开(公告)日：2006-06-21
申请号：EP04030142.6
申请日：2004-12-20
申请人： Hitachi Ltd. , Hitachi Car Engineering Co., Ltd.
发明人： Kobayashi, Chihiro c/o Hitachi, Ltd., Intellectual , Igarashi, Shinya c/o Hitachi Car Engineering Co.,
IPC分类号： G01F1/696 , G01F1/698
CPC分类号： G01F1/6983 , F02D41/187 , G01F1/6965
摘要： The present invention relates to a thermal type gas flow measuring instrument that measures gas flow with high precision by accurately correcting changes in radiation heat characteristics of a heating resistor (3) due to contamination. The instrument comprises a second heating resistor (30) whose resistance value, which changes if contaminated, is calculated by measuring the terminal voltage thereof by calculating means (32), and the calculated value is compared with a temperature detected by a temperature detecting element (31). Based on the result of comparison, the level of contamination of the second heating resistor (30) is determined. The second heating resistor (30) and the first heating resistor (3) are disposed in similar environments such that their levels of contamination can be considered equal. Based on the level of contamination calculated from the result of comparison, a correction value is calculated and the output of the first heating resistor (3) is corrected in accordance with the correction value.

2. 发明公开

EP1544583A2 Thermal type gas flow measuring instrument 有权
标题翻译： Thermische Vorrichtung zumGasströmungsmessen
公开(公告)号：EP1544583A2
公开(公告)日：2005-06-22
申请号：EP04030142.6
申请日：2004-12-20
申请人： Hitachi Ltd. , Hitachi Car Engineering Co., Ltd.
发明人： Kobayashi, Chihiro c/o Hitachi, Ltd., Intellectual , Igarashi, Shinya c/o Hitachi Car Engineering Co.,
IPC分类号： G01F1/696
CPC分类号： G01F1/6983 , F02D41/187 , G01F1/6965
摘要： The present invention relates to a thermal type gas flow measuring instrument that measures gas flow with high precision by accurately correcting changes in radiation heat characteristics of a heating resistor (3) due to contamination. The instrument comprises a second heating resistor (30) whose resistance value, which changes if contaminated, is calculated by measuring the terminal voltage thereof by calculating means (32), and the calculated value is compared with a temperature detected by a temperature detecting element (31). Based on the result of comparison, the level of contamination of the second heating resistor (30) is determined. The second heating resistor (30) and the first heating resistor (3) are disposed in similar environments such that their levels of contamination can be considered equal. Based on the level of contamination calculated from the result of comparison, a correction value is calculated and the output of the first heating resistor (3) is corrected in accordance with the correction value.
摘要翻译：本发明涉及通过精确地校正由于污染导致的加热电阻器（3）的辐射热特性的变化来高精度地测量气体流量的热式气体流量测量仪器。仪器包括第二加热电阻器（30），其电阻值（如果受到污染则改变其值），通过用计算装置（32）测量其端电压来计算，并将所计算的值与温度检测元件（ 31）。基于比较的结果，确定第二加热电阻器（30）的污染水平。第二加热电阻器（30）和第一加热电阻器（3）被设置在类似的环境中，使得它们的污染程度可以被认为是相等的。基于从比较结果计算出的污染程度，计算出校正值，并根据校正值校正第一加热电阻器（3）的输出。

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