Mass air flow meter

Details Mass air flow meter Mass air flow meter

1990-05-17

1991-09-17

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

7320421, G01M 1900

Patent

active

050483277

ABSTRACT:
Improvements in a mass air flow meter for internal combustion engines are disclosed which comprise structure for improving the flow dynamics of the air flow through the sampling path including expansion of the dynamic range and increase of the signal to noise ratio resulting in improved engine performance, fuel efficiency, and emission control. Such structure includes a sample tube being tapered in decreasing area in the direction of air flow therethrough and a pneumatic equivalent of a low pass R C filter which decouples the high turbulence in the main flow through the venturi, averages same and provides a scaled down profiled flow through the sample tube for measurement by a transducer in the sample tube, the measurements having an accuracy of .+-.2% of reading.

REFERENCES:
patent: 4366704 (1983-01-01), Sato et al.
patent: 4517837 (1985-05-01), Oyama

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