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Airflow meter

  • US 6,786,089 B2
  • Filed: 09/25/2002
  • Issued: 09/07/2004
  • Est. Priority Date: 03/28/2002
  • Status: Active Grant
First Claim
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1. An airflow meter, comprising:

  • a member that defines a bypass passage in which a bypass air flow comprising a part of air flowing in a main passage is introduced; and

    a sensor element disposed in the bypass passage, for detecting an amount of airflow, said sensor element being disposed so that a width of the sensor element is perpendicular to a direction of bypass air flow therepast, wherein the bypass passage has a sensing passage which restricts a cross-sectional area of the bypass passage along a longitudinal direction of the bypass passage at least before the sensor element, the sensing passage being restricted in a lateral direction that is perpendicular to said direction of bypass air flow and parallel to a width direction of the sensor element.

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