Thermal air flowmeter

Details Thermal air flowmeter Thermal air flowmeter

2005-06-07

2005-06-07

Bui, Bryan (Department: 2863)

Data processing: measuring, calibrating, or testing

Calibration or correction system

Signal frequency or phase correction

C702S045000, C702S053000, C702S087000, C702S088000

Reexamination Certificate

active

06904379

ABSTRACT:
A thermal type air flowmeter arranges a temperature-dependent heating resistance element in an air flow path and measures the air flow rate from the output of a gauge circuit containing the heating resistance element. A calculation circuit in the flowmeter is provided for correcting the output characteristic by a polynomial expression higher than a quadratic expression. Thereby, high flowmeter measuring accuracy is achieved in lieu of laser trimming and with small-scale circuit composition.

REFERENCES:
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patent: 2000-2575 (2000-01-01), None
patent: 2000-002575 (2000-01-01), None
Japanese Notice of Rejection Dated Aug. 10, 2004 and English Translation of Same (5 Total Pages).

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