Air-fuel ratio control device for internal combustion engine

Details Air-fuel ratio control device for internal combustion engine Air-fuel ratio control device for internal combustion engine

1995-11-30

1997-03-11

Kwon, John T.

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60276, F01N 300

Patent

active

056090250

ABSTRACT:
An air-fuel ratio control device is for an internal combustion engine having a fuel injector and a catalytic converter, with an O.sub.2 storage ability, arranged in an exhaust passage. The device comprises a first air-fuel ratio detector for detecting an air-fuel ratio in an exhaust gas upstream of the catalytic converter and a second air-fuel ratio detector for detecting an air-fuel ratio in exhaust gas downstream of the catalytic converter. The device controls an amount of injected fuel on the basis of an output of the first air-fuel ratio detector, and corrects a standard output of the first air-fuel ratio detector corresponding to the stoichiometric air-fuel ratio by a correction value determined on the basis of a difference between an air-fuel ratio detected by the second air-fuel ratio detector and the stoichiometric air-fuel ratio. Moreover, the device changes the correction value such that the lower a current O.sub.2 storage ability is, determined on the basis of a variable which varies in accordance with the current O.sub.2 storage ability, the smaller said correction value becomes.

REFERENCES:
patent: 5331808 (1994-07-01), Koike
patent: 5337558 (1994-08-01), Komatsu
patent: 5414996 (1995-05-01), Sawada et al.
patent: 5433074 (1995-07-01), Seto et al.
patent: 5533332 (1996-07-01), Uchikawa

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