Air-fuel ratio control device for internal combustion engine

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

2006-11-07

2009-10-06

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S276000, C060S277000, C701S103000, C701S109000

Reexamination Certificate

active

07596941

ABSTRACT:
An air-fuel ratio control device for an internal combustion engine can detect the deteriorated purification state of a catalyst without delay after completion of rich or lean control, and can rapidly restore the purification state. A filter process constant for a downstream O2sensor output is set smaller when rich or lean control are performed, thus allowing detection of the deteriorated purification state of the catalyst without delay. After the rich or lean control is completed, a dual O2control system is used to rapidly restore the purification state. Further, the impact of downstream O2sensor output variation when the catalyst is deteriorated can be suppressed, and stability of the dual O2control system can be maintained.

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