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

2007-03-14

2008-08-19

Argenbright, T. M (Department: 3747)

Power plants

Internal combustion engine with treatment or handling of...

Methods

C060S276000, C060S277000, C060S285000, C073S118040, C123S688000, C701S109000

Reexamination Certificate

active

07412820

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine having a catalyst provided in an exhaust system of the engine for purifying exhaust gases and a first oxygen concentration sensor disposed upstream of the catalyst is disclosed. The air-fuel ratio control system controls an air-fuel ratio of an air-fuel mixture supplied to the engine. A degree of response deterioration of the first oxygen concentration sensor is detected. A response delay of the first oxygen concentration sensor is compensated according to the detected degree of deterioration to calculate a compensated sensor output. The air-fuel ratio is controlled so that a detected air-fuel ratio calculated from the compensated sensor output coincides with a target air-fuel ratio. A frequency characteristic of the compensation is adjusted according to the detected degree of deterioration.

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patent: 1 703 108 (2006-09-01), None
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patent: 10-73049 (1998-03-01), None

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