Internal combustion engine

Details Internal combustion engine Internal combustion engine

1989-04-26

1991-01-22

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

73 3, 731182, F02D 4118, G01F 2500

Patent

active

049862448

ABSTRACT:
An internal combustion engine has an intake air flowmeter which includes a first air flow rate computing means for computing the flow rate of intake air from an output of a hot-wire type air flowmeter in accordance with a first flow rate conversion function, a second air flow rate computing means for computing the intake air flow rate from data concerning a given opening degree of the throttle valve and measured engine speed in accordance with a second flow rate conversion function, and a calibration device for calibrating the first conversion function in accordance with the air flow rate computed by the second air flow rate computing means. When the extent of secular change due to contamination of the hot wire of the air flowmeter has exceeded a predetermined limit, the calibration device is put into effect to calibrate the first flow rate conversion function, so that the intake air flow rate can be measured with a high degree of accuracy without being influenced substantially by the secular change of the hot-wire type air flowmeter.

REFERENCES:
patent: 4264961 (1981-04-01), Nishimura et al.
patent: 4644474 (1987-02-01), Aposchanski et al.
patent: 4706631 (1987-11-01), Wataya
Patent Abstracts of Japan, vol. 12, No. 315 (M-735)[3162], Aug. 26, 1988 & JP-A-63-88237.
Patent Abstracts of Japan, vol. 13, No. 6 (M-781)[3354], Jan. 9, 1989 & JP-A-63-215844.
Patent Abstracts of Japan, vol. 11, No. 258 (M-618) [2705], Aug. 21, 1987 & JP-A-62-63285.

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