Intake air flow rate measuring apparatus for internal combustion

Details Intake air flow rate measuring apparatus for internal combustion Intake air flow rate measuring apparatus for internal combustion

1992-12-18

1994-04-19

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

731182, 73198, G01F 168

Patent

active

053035844

ABSTRACT:
An apparatus for measuring the flow rate of an intake air flowing through an air passage which communicates with an internal combustion engine is disclosed. The apparatus includes a heat-generating resistor element disposed in the air passage for detecting the flow rate of the intake air in the air passage, and at least one protective member disposed on upstream and/or downstream side(s) of the heat-generating resistor element as viewed in an air flow direction in which the intake air flows through the air passage, so as to extend in a direction perpendicular to the air flow direction. The protective member(s) is/are formed of a water-absorptive porous material, and have a plurality of holes formed through the thickness thereof in the air flow direction.

REFERENCES:
patent: 3433069 (1969-03-01), Trageser
patent: 4210016 (1980-07-01), Peter et al.
patent: 5014552 (1991-05-01), Kamiunten et al.
Ueno et al., "Anti-Dirt Property of Hot-Wire Air Flow Meter", 1983, Society of Automotive Engineers, Inc., pp. 1-12.

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