Air flow rate meter

Details Air flow rate meter Air flow rate meter

1991-01-24

1992-06-09

Raevis, Robert

Measuring and testing

Simulating operating condition

Marine

G01M 1500

Patent

active

051196727

ABSTRACT:
An air flow rate meter, in particular for measuring the mass of air aspirated by an internal combustion engine, has a main flow conduit with a venturi-like flow portion and a bypass conduit, which discharges with an inlet and outlet opening above and below the venturi-like flow portion, respectively. A temperature-dependent measuring resistor is disposed in the bypass conduit. To avoid impairment of the measured value signal by an increase in the noise component caused by turbulence of the air upstream of the venturi-like flow portion, which unavoidably occurs upon deflection of the air flow direction, the inlet opening of the bypass conduit is shifted in the flow direction upstream of the deflection of the air flow, into a region of quasi-laminar flow with a constant pressure profile.

REFERENCES:
patent: 4515014 (1985-05-01), Sumal
patent: 4624134 (1986-11-01), Nagano
patent: 4887577 (1989-12-01), Arai et al.

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