Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1994-12-12
1996-06-25
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60285, F01N 328
Patent
active
055288995
ABSTRACT:
An air-fuel ratio control system for an internal combustion engine is provided. This system has an upstream air-fuel ratio sensor arranged upstream of a catalytic converter and a downstream air-fuel ratio sensor arranged downstream thereof, and learns a given feedback control parameter upon reversal of an air-fuel ratio between rich and lean sides based on the downstream air-fuel ratio sensor. The system also learns the given feedback control parameter when preselected conditions are met even if the air-fuel ratio is not reversed. Additionally, the system, when brought under open-loop control from feedback control, stores the given control parameter. Upon resumption of the feedback control, when the air-fuel ratio shows the same status, the stored given control parameter is used. Further, the system controls the air-fuel ratio based on the output from the downstream air-fuel ratio sensor when it moves out of a preselected range.
REFERENCES:
patent: 4761950 (1988-08-01), Nagai et al.
patent: 5193339 (1993-03-01), Furuya
patent: 5337557 (1994-08-01), Toyoda
patent: 5341641 (1994-08-01), Nakajima
Hart Douglas
Nippondenso Co. Ltd.
LandOfFree
Air-fuel ratio control apparatus for internal combustion engines does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Air-fuel ratio control apparatus for internal combustion engines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Air-fuel ratio control apparatus for internal combustion engines will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2181045