Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Reexamination Certificate
2007-04-10
2007-04-10
Denion, Thomas (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
By means producing a chemical reaction of a component of the...
C060S274000, C060S276000, C060S299000
Reexamination Certificate
active
11200159
ABSTRACT:
An air-fuel ratio control system has an upstream catalyst, a downstream catalyst, a first sensor for detecting a first air-fuel ratio present upstream the upstream catalyst, a second sensor for detecting a second air-fuel ratio present between the catalysts and a third sensor for detecting a third air-fuel ratio present downstream the downstream catalyst. An ECU determines a target second air-fuel ratio based on the detected third air-fuel ratio, and a target first air-fuel ratio based on the target second air-fuel ratio and the detected second air-fuel ratio. The ECU feedback controls an air-fuel ratio of mixture based on the target first air-fuel ratio and the detected first air-fuel ratio. The target first air-fuel ratio is corrected based on the detected third air-fuel ratio so that a change in the target first air-fuel ratio becomes smaller in a predetermined range other than a normal range.
REFERENCES:
patent: 5740676 (1998-04-01), Agustin et al.
patent: 6253541 (2001-07-01), Sullivan et al.
patent: 6256981 (2001-07-01), Sullivan et al.
patent: 6256983 (2001-07-01), Yasui
patent: 6530214 (2003-03-01), Ikemoto et al.
patent: 6539707 (2003-04-01), Ikemoto et al.
patent: 6904751 (2005-06-01), Makki et al.
Denion Thomas
Denso Corporation
Nixon & Vanderhye P.C.
Tran Diem
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