Apparatus and method for controlling air-fuel ratio of an intern

Details Apparatus and method for controlling air-fuel ratio of an intern Apparatus and method for controlling air-fuel ratio of an intern

1996-08-21

1997-09-30

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4100

Patent

active

056717202

ABSTRACT:
An air-fuel ratio feedback correction coefficient for correcting a fuel supply quantity to an engine is proportional-plus-integral controlled based on an output from an oxygen sensor for detecting oxygen concentration in the exhaust gases. When the oxygen sensor is in an inactive condition, deviation of an air-fuel ratio control point in the air-fuel ratio feedback control is detected, and an operating quantity in the proportional-plus-integral control is corrected so as to reduce the detected deviation.

REFERENCES:
patent: 4452207 (1984-06-01), Moore, Jr.
patent: 5239971 (1993-08-01), Uchinami
patent: 5278762 (1994-01-01), Kawamura
patent: 5391284 (1995-02-01), Hotzel
patent: 5427083 (1995-06-01), Ahern

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