Abnormality diagnosis device of internal combustion engine

Details Abnormality diagnosis device of internal combustion engine Abnormality diagnosis device of internal combustion engine

2011-04-26

2011-04-26

Vo, Hieu T (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

Reexamination Certificate

active

07933710

ABSTRACT:
A cylinder causing an abnormal air-fuel ratio is specified. Injection ratio changing control for gradually changing a ratio between command injection quantities of two injectors of the abnormal cylinder while keeping the sum of the command injection quantities of the two injectors constant is performed on the abnormal cylinder. If the injection ratio changing control is performed under the same condition, a changing behavior of the actual sum injection quantity of the two injectors varies and a changing behavior of the air-fuel ratio varies depending on which one of the two injectors is abnormal. Therefore, the abnormal injector out of the two injectors is specified using a learning value of an air-fuel ratio feedback correction value based on an output of an exhaust gas sensor.

REFERENCES:
patent: 4765297 (1988-08-01), Richter
patent: 5730111 (1998-03-01), Kaji et al.
patent: 6470682 (2002-10-01), Gray, Jr.
patent: 2006-299945 (2006-11-01), None
patent: 2007-085176 (2007-04-01), None

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