Method of determining activation of exhaust gas ingredient-conce

Details Method of determining activation of exhaust gas ingredient-conce Method of determining activation of exhaust gas ingredient-conce

1989-03-15

1990-04-10

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02D 4114

Patent

active

049150812

ABSTRACT:
A method of determining the activation of an exhaust gas ingredient-concentration sensor for use in an internal combustion engine. The air-fuel ratio of a mixture is controlled in a feedback manner by the use of a coefficient varying with an output of the sensor during engine operation in an air-fuel ratio feedback control region. The activation of the sensor is determined based on the output of the sensor. When the engine has shifted from the air-fuel ratio feedback control region to a predetermined decelerating region, calculated is an average value of values of the coefficient obtained by the feedback control immediately before the shifting. The air-fuel ratio of the mixture is leaned by the use of the average value thus calculated. It is determined whether or not the sensor is activated when the air-fuel ratio has thus been leaned.

REFERENCES:
patent: 4434764 (1984-03-01), Hasegawa et al.
patent: 4485786 (1984-12-01), Kashimura
patent: 4502443 (1985-03-01), Hasegawa et al.
patent: 4566419 (1986-01-01), Ninomiya et al.
patent: 4723521 (1988-02-01), Mieno et al.
patent: 4751909 (1988-06-01), Otobe
Japanese Provisional Patent Publication (Kokai) No. 62-162955, 7/18/1987.

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