Engine suction air flow rate measuring device

Details Engine suction air flow rate measuring device Engine suction air flow rate measuring device

2007-04-17

2007-04-17

McCall, Eric S. (Department: 2855)

Measuring and testing

Simulating operating condition

Marine

Reexamination Certificate

active

10547317

ABSTRACT:
The present invention embodies an engine intake air flow meter measuring a mass flow rate based on measured pressures in an intake pipe, such as a pressure difference between two points and a pressure at a point. Calculations for integration and double integration of the pressure difference are performed, and both values of integration and double integration are corrected at a moment when an air flow rate is detected to be a zero based on a value of a time derivative of the pressure. Then a mass flow rate and an amount of air are calculated by the value of integration and the value of double integration respectively.

REFERENCES:
patent: 5654501 (1997-08-01), Grizzle et al.
patent: 6598469 (2003-07-01), Shimoyama et al.
patent: 6681742 (2004-01-01), Hirayama et al.
patent: 6985806 (2006-01-01), Stadler
patent: 7003390 (2006-02-01), Kaga
patent: 7027905 (2006-04-01), Mladenovic et al.
patent: 2005/0021215 (2005-01-01), Stadler

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