Mass air flow sensor structure with bi-directional airflow incid

Details Mass air flow sensor structure with bi-directional airflow incid Mass air flow sensor structure with bi-directional airflow incid

1995-09-06

1997-05-20

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

056314175

ABSTRACT:
A mass air flow sensor comprising: a sensing device with a substantially flat surface from a first point to a second point in a flow path, a heating element substantially centrally located between the first and second points, a first sensing element located between the first and second points on a first side of the heating element in the flow path direction, a second sensing element located between the first and second points on a second side of the heating element opposite the first side in the flow direction; and an air foil mounted a predetermined distance apart from the sensing device having a surface facing the heating element and the first and second sensors, wherein the air foil deflects air flow past the sensing device to be incident on the sensing device at an angle, wherein the air foil is symmetrical with respect to a line perpendicular to a center of the heating element and wherein bi-directional air flow past the sensing device is substantially free of turbulence between the first and second points.

REFERENCES:
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patent: 4782708 (1988-11-01), Harrington et al.
patent: 4864855 (1989-09-01), Shiraishi et al.
patent: 5086650 (1992-02-01), Harrington
patent: 5263380 (1993-11-01), Sultan et al.
Breakthrough in Reverse Flow Detection--A New Mass Air Flow Meter Using Micro Silicon Technology, SAE Technical Paper Series No. 950433, International Congress & Exposition Detroit, Michigan, Feb. 27-Mar. 2, 1995.

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