Cylinder abnormality diagnosis unit of internal combustion...

Details Cylinder abnormality diagnosis unit of internal combustion... Cylinder abnormality diagnosis unit of internal combustion...

2007-11-13

2009-02-03

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

C123S19800E

Reexamination Certificate

active

07487035

ABSTRACT:
It is determined whether an engine operating state is within a specified operating range. When the engine operating state is within the specified operating range, the air-fuel ratio of an i-th cylinder is estimated based on the detection value of the air-fuel ratio sensor, and a cylinder deviation, which is the deviation of an estimated air-fuel ratio from a reference air-fuel ratio, is computed. When this cylinder deviation becomes larger than a specified determination value, the processing of incrementing the count value of an abnormality counter is started at a point in time when a specified delay time elapses after the cylinder deviation becomes larger than the specified determination value. At a point in time when the count value of the abnormality counter becomes larger than a specified abnormality determination value, it is determined that the air-fuel ratio of the i-th cylinder is abnormal.

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