JP3980586B2 - 熱式空気流量計 - Google Patents
熱式空気流量計 Download PDFInfo
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- JP3980586B2 JP3980586B2 JP2004298011A JP2004298011A JP3980586B2 JP 3980586 B2 JP3980586 B2 JP 3980586B2 JP 2004298011 A JP2004298011 A JP 2004298011A JP 2004298011 A JP2004298011 A JP 2004298011A JP 3980586 B2 JP3980586 B2 JP 3980586B2
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- air flow
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Description
(1)一つは、温度依存性を有する発熱抵抗素子を空気流路に配置し、この発熱抵抗素子を有し且つ非線形な特性を持ったゲージ回路の出力から空気流量を測定する熱式空気流量計において、出力特性を演算回路を用いて2次式以上の多項式(例えば、3次式から5次式のいずれか一つの多次元多項式)により補正するようにした。
(2)もう一つは、熱式空気流量計において、空気流量−出力特性に関するマップデータを有し、このマップデータの領域を分割して各空気流量領域ごとに変更される出力特性補正式を用意して、空気流量を算出する方式を提案する。
Claims (2)
- 温度依存性を有し空気流路に配置される発熱抵抗素子と、
この発熱抵抗素子を有し、空気流量を入力とし、電気信号を出力とする検出特性が非線形な特性を持ったゲージ回路とを備え、
前記ゲージ回路の出力から空気流量を測定する熱式空気流量計において、
出力特性を2次式以上の多項式を含む演算式により補正する演算回路を備え、
前記演算回路は、前記演算式により前記非線形特性の出力をゼロ点調整、スパン調整、及び目標の非線形特性に近似させるノンリニア調整を行なう回路により構成され、上記各調整後に決定された補正係数を記憶する手段を備え、
前記演算回路は、その回路の温度を出力特性の調整要素として取り入れるようにし、
前記演算回路のICチップ内にチップ温度を検出する温度センサが内蔵され、このチップ温度を用いて回路の温度補正を行なうようにしたことを特徴とする熱式空気流量計。 - 請求項1記載の熱式空気流量計において、前記演算回路は、前記回路の温度補正に加えて空気温度を出力特性の調整要素として取り入れるようにしてあることを特徴とする熱式空気流量計。
Priority Applications (1)
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JP2004298011A JP3980586B2 (ja) | 2004-10-12 | 2004-10-12 | 熱式空気流量計 |
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JP2004298011A JP3980586B2 (ja) | 2004-10-12 | 2004-10-12 | 熱式空気流量計 |
Related Parent Applications (1)
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JP2002525454A Division JP3619230B2 (ja) | 2000-09-04 | 2000-09-04 | 熱式空気流量計 |
Related Child Applications (1)
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JP2006318878A Division JP2007071889A (ja) | 2006-11-27 | 2006-11-27 | 熱式空気流量計 |
Publications (2)
Publication Number | Publication Date |
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JP2005037404A JP2005037404A (ja) | 2005-02-10 |
JP3980586B2 true JP3980586B2 (ja) | 2007-09-26 |
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Application Number | Title | Priority Date | Filing Date |
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JP2004298011A Expired - Fee Related JP3980586B2 (ja) | 2004-10-12 | 2004-10-12 | 熱式空気流量計 |
Country Status (1)
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JP (1) | JP3980586B2 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4801501B2 (ja) * | 2006-05-23 | 2011-10-26 | シーケーディ株式会社 | 熱式流量計 |
JP5971199B2 (ja) | 2013-06-12 | 2016-08-17 | 株式会社デンソー | 空気流量調整装置 |
JP6156523B2 (ja) * | 2016-01-11 | 2017-07-05 | 株式会社デンソー | 流量センサ |
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2004
- 2004-10-12 JP JP2004298011A patent/JP3980586B2/ja not_active Expired - Fee Related
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JP2005037404A (ja) | 2005-02-10 |
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