Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1997-08-20
1999-10-19
Ryznic, John E.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60277, F01N 300
Patent
active
059669306
ABSTRACT:
A catalyst deterioration-determining system for an internal combustion engine has a catalyst arranged in the exhaust system, for purifying exhaust gases emitted from the engine, an oxygen concentration sensor arranged in the exhaust system at a location downstream of the catalyst, for detecting the concentration of oxygen present in the exhaust gases, and an ECU which controls the air-fuel ratio of an air-fuel mixture supplied to the engine in a feedback manner in response to the output from the oxygen concentration sensor. Determination of deterioration of the catalyst is carried out based on the output from the oxygen concentration sensor during execution of air-fuel ratio feedback control. An inversion period parameter representative of a repetition period of change in the output from the oxygen concentration sensor over a predetermined diagnosis period is measured, and a determination parameter is calculated by averaging values of the inversion period parameter measured over different diagnosis periods as the predetermined diagnosis period. The determination of deterioration of the catalyst is carried out based on the determination parameter.
REFERENCES:
patent: 5325664 (1994-07-01), Seki et al.
patent: 5337558 (1994-08-01), Komatsu
patent: 5381657 (1995-01-01), Takizawa et al.
patent: 5406789 (1995-04-01), Takizawa et al.
patent: 5448886 (1995-09-01), Toyoda
patent: 5487269 (1996-01-01), Atanasyan et al.
patent: 5509267 (1996-04-01), Theis
patent: 5526643 (1996-06-01), Mukaihira et al.
patent: 5528898 (1996-06-01), Nakayama et al.
patent: 5626014 (1997-05-01), Hepburn et al.
patent: 5724952 (1998-03-01), Miyashita et al.
patent: 5732551 (1998-03-01), Naber et al.
patent: 5732552 (1998-03-01), Matsumoto et al.
Fujiki Yuji
Fujimoto Sachito
Hatano Gaku
Matsuzono Yoshiaki
Moriwaki Hideo
Honda Giken Kogyo Kabushiki Kaisha
Ryznic John E.
LandOfFree
Catalyst deterioration-determining system for internal combustio does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Catalyst deterioration-determining system for internal combustio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Catalyst deterioration-determining system for internal combustio will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2042832