Abnormality diagnosis device and control system for internal...

Details Abnormality diagnosis device and control system for internal... Abnormality diagnosis device and control system for internal...

2008-06-03

2009-10-20

Huynh, Hai H (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C123S690000, C701S107000

Reexamination Certificate

active

07603994

ABSTRACT:
An exhaust gas discharged from a combustion chamber of each cylinder flows near an air-fuel ratio sensor via a junction. An ECU estimates an air-fuel ratio of each cylinder based upon a sensing value of an air-fuel ratio sensor. When a variation in the air-fuel ratio among the cylinders is equal to or greater than a predetermined value, the ECU determines that an abnormality exists in the air-fuel ratio. When a quantity of the exhaust gas discharged from each cylinder is less than another predetermined value, an intake air quantity is increased and ignition timing is delayed before the determination of presence or absence of the abnormality.

REFERENCES:
patent: 6772585 (2004-08-01), Iihoshi et al.
patent: 7243644 (2007-07-01), Okamoto et al.
patent: 7409284 (2008-08-01), Okamoto et al.
patent: 2007/0175462 (2007-08-01), Okamoto et al.
patent: 2006-138280 (2006-06-01), None

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