Air-fuel ratio control system and method for internal...

Details Air-fuel ratio control system and method for internal... Air-fuel ratio control system and method for internal...

2007-09-20

2009-02-03

Kwon, John T (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C123S674000, C701S103000, C701S108000, C060S277000

Reexamination Certificate

active

07484504

ABSTRACT:
An air-fuel ratio control system includes: a catalyst; an oxygen concentration sensor; an integral value calculation portion that calculates an integral value of a deviation updated by integrating the deviation between an output value from the oxygen concentration sensor and a reference value; an air-fuel ratio control portion that controls an air-fuel ratio of exhaust gas entering the catalyst to be equal to a target air-fuel ratio; a target air-fuel ratio switching portion that sets a rich target air-fuel ratio when the output value has been inverted from rich to lean while sets a lean target air-fuel ratio when the output value has been inverted from lean to rich; and an integral value correction portion that corrects the integral value of the deviation when the air-fuel ratio is being controlled to a switched target air-fuel ratio, based on whether the next inversion takes place within a predetermined time period from the last inversion.

REFERENCES:
patent: 7117665 (2006-10-01), Kamoto et al.
patent: 2002/0007627 (2002-01-01), Hashimoto
patent: 2003/0154953 (2003-08-01), Yasui
patent: 2004/0045282 (2004-03-01), Ide et al.
patent: 2005/0217243 (2005-10-01), Kamoto et al.
patent: 2006/0282211 (2006-12-01), Yasui
patent: 2003-049685 (2003-02-01), None
patent: 2005-113729 (2005-04-01), None

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