Apparatus and method for estimating atmospheric pressure in an i

Details Apparatus and method for estimating atmospheric pressure in an i Apparatus and method for estimating atmospheric pressure in an i

1996-01-05

1997-05-20

Chilcot, Richard

Measuring and testing

Simulating operating condition

Marine

73116, G01M 1900, G01M 500

Patent

active

056314124

ABSTRACT:
Engine intake air flow rate is detected as a mass flow rate, using a thermal type air flow meter, and engine intake air flow rate is also detected as a volumetric flow rate based on throttle valve opening and rotational speed. The mass flow rate is converted to volumetric flow rate based on the current intake air temperature, and a ratio of, the volumetric flow rate obtained by the conversion and the volumetric flow rate based on throttle opening and engine rotational speed is output as a value corresponding to atmospheric pressure.

REFERENCES:
patent: 3913398 (1975-10-01), Curtis
patent: 4495921 (1985-01-01), Sawamoto
patent: 5003950 (1991-04-01), Kato et al.
patent: 5012422 (1991-04-01), Takashi et al.
patent: 5526685 (1996-06-01), Davis
patent: 5532930 (1996-07-01), Kako

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