Air-fuel ratio control device for internal-combustion engine

Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...

Reexamination Certificate

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C060S277000, C060S300000

Reexamination Certificate

active

10881177

ABSTRACT:
A catalyst is positioned in an exhaust path of an internal-combustion engine. A main air-fuel ratio sensor and sub-oxygen sensor are respectively positioned upstream and downstream of the catalyst. A main feedback operation is performed so that the output of the main air-fuel ratio sensor is fed back and reflected in the fuel injection quantity until the control A/F prevailing upstream of the catalyst coincides with the target A/F. A sub-feedback operation is performed so that the output of the sub-oxygen sensor is fed back and reflected in the fuel injection quantity until the air-fuel ratio of an exhaust gas flowing out of the catalyst agrees with a theoretical air-fuel ratio. Since a catalyst window varies in accordance with the intake air quantity, the fuel injection quantity is corrected so that the larger the intake air quantity becomes, the richer the control A/F is.

REFERENCES:
patent: 5115639 (1992-05-01), Gopp
patent: 5228286 (1993-07-01), Demura
patent: 5319921 (1994-06-01), Gopp
patent: 6018945 (2000-02-01), Nakagawa
patent: 6502389 (2003-01-01), Katayama et al.
patent: 6668813 (2003-12-01), Azuma et al.
patent: 6941745 (2005-09-01), Ikemoto et al.
patent: A 6-101536 (1994-04-01), None
patent: A 7-197837 (1995-08-01), None
patent: A 9-60544 (1997-03-01), None

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