Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1992-11-17
1994-01-25
Kamen, Noah P.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60277, 60285, F01N 320
Patent
active
052807070
ABSTRACT:
A catalyst deterioration detection apparatus having oxygen sensors disposed in the upper stream and the lower stream from a ternary catalyst disposed in the exhaust system of an internal combustion engine, controlling so as to make the air/fuel ratio of the internal combustion engine to be in the neighborhood of a theoretical air/fuel ratio in response to an output signal from at least either of the oxygen sensors, detecting a response delay time from a moment an output signal from the upper stream oxygen sensor has been changed to a moment an output signal from the lower stream oxygen sensor has been changed when the air/fuel ratio of the internal combustion engine is changed from the rich side to the lean side or from the lean side to the rich side, and discrimination that the catalyst has deteriorated if the response delay time is shorter than a predetermined value, the catalyst deterioration detection apparatus including a device for permitting the catalyst deterioration detection apparatus to perform the detection operation if a fact that the internal combustion engine is in a predetermined operation state has been detected and a fact that the air/fuel ration has been converged to the neighborhood of the theoretical air/fuel ratio has been detected.
REFERENCES:
patent: 5154055 (1992-10-01), Nakane et al.
patent: 5220788 (1993-06-01), Kurita et al.
Mizuno Toshiaki
Nakashima Akihiro
Kamen Noah P.
Nippondenso Co. Ltd.
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