Air flow meter

Details Air flow meter Air flow meter

1991-04-25

1993-05-11

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Proportional

731182, 7320421, G01F 168, G01F 500

Patent

active

052091139

ABSTRACT:
An air flow meter has a cylindrical housing to be coupled to an intake air conduit of a vehicle in a way that a main passage is formed within said housing. An egg-shaped member has a bypass passage formed therein is supported by a plurality of supporting members in a center of the main passage. A flow rate detecting resistance is provided in the bypass passage. There are two throttling portions formed within the cylindrical housing. A downstream throttling portion, which is provided near an outlet of the bypass passage, throttles a flow of air in the main passage near the outlet of the bypass passage so as to cause air in the main passage to be introduced into the inlet of bypass passage by a pressure difference caused thereby. An upstream throttling portion, which is provided upstream of the downstream throttling portion, throttles a flow of air in the main passage so that the flow of air in the main passage is equalized.

REFERENCES:
patent: 3314290 (1967-04-01), Peranio
patent: 3374673 (1968-03-01), Trageser
patent: 4325253 (1982-04-01), Romann et al.
patent: 4562731 (1986-01-01), Nishimura et al.
patent: 4709581 (1987-12-01), Nishimura et al.
patent: 4776213 (1988-10-01), Belchinger et al.
patent: 4793176 (1988-12-01), Sato et al.
patent: 4887577 (1989-12-01), Arai et al.
patent: 4920808 (1990-05-01), Sommer

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