Air-fuel ratio control apparatus for internal combustion engine

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

2005-01-04

2005-01-04

Solis, Erick (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C123S675000, C123S326000, C123S344000, C701S109000, C060S276000

Reexamination Certificate

active

06837232

ABSTRACT:
When in controlling an air-fuel ratio by a feedback control, a target air-fuel ratio is changed between normal time and at rich control time, a difference between a change amount of the target air-fuel ratio and a change amount of an air-fuel ratio feedback correction coefficient is learned as a sensor error in the rich control. A final detected air-fuel ratio is calculated by correcting a detected air-fuel ratio of an air-fuel ratio sensor in rich control based on the sensor error. Alternatively, the target air-fuel ratio or the air-fuel ratio feedback correction coefficient in the rich control may be corrected based on the sensor error.

REFERENCES:
patent: 4546747 (1985-10-01), Kobayashi et al.
patent: 5396765 (1995-03-01), Maruyama et al.
patent: 5778866 (1998-07-01), Uchikawa
patent: 5964208 (1999-10-01), Yamashita et al.
patent: 20010006062 (2001-07-01), Wakui et al.

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