Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1996-02-20
1998-04-21
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60277, 60288, F01N 328
Patent
active
057406766
ABSTRACT:
A diagnostic apparatus for exhaust gas clarification apparatus for internal combustion engine is disclosed. The diagnostic apparatus can diagnoses the individual catalyst independently by means that an air/fuel ratio sensor is mounted before and after the individual catalyst, and that the individual catalyst is diagnosed by estimating the correlation of the output signals from the air/fuel ratio sensors mounted before and after the individual catalyst, and furthermore, that the individual diangosis operation is performed at distinctive operation regions adequate for their corresponding diagnostic mode.
REFERENCES:
patent: 5509267 (1996-04-01), Theis
Patent Abstract of Japan, JP 6-117310 dated Apr. 26, 1994.
Patent Abstract of Japan, JP 6-010738 dated Jan. 18, 1994.
Patent Abstract of Japan, JP 6-159044 dated Jun. 7, 1994.
European Search Report dated May 30, 1996.
Agustin Rogelio B.
Fukuchi Eisaku
Ishii Toshio
Numata Akihito
Takaku Yutaka
Hart Douglas
Hitachi , Ltd.
Hitachi Car Engineering Co. Ltd.
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