Air-fuel ratio control system for internal combustion engine

Details Air-fuel ratio control system for internal combustion engine Air-fuel ratio control system for internal combustion engine

2007-10-09

2009-08-04

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C123S703000

Reexamination Certificate

active

07568476

ABSTRACT:
When detecting the data showing an output characteristics of an air-fuel ratio sensor, the air-fuel ratio (feed air-fuel ratio) supplied to each cylinder is alternately changed to rich or lean by a predetermined ratio (X %). And then, the average value of the detected air-fuel ratio λ in the rich side and the lean side is respectively computed. A ratio between the variation width of the air-fuel ratio and the detection variation of the air-fuel ratio sensor20is computed as an output-characteristics correction value for correcting the dispersion in the output characteristics of the air-fuel ratio sensor. By correcting the air-fuel ratio detection of the air-fuel ratio sensor with this output-characteristics correction value, the dispersion in the output characteristics due to manufacturing tolerances, aged deterioration, etc. of the air-fuel ratio sensor is corrected.

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