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Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0521641-A1-19930107
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EP-0521641-A1-19930107
A method of detecting catalyst malfunction in a vehicle uses an exhaust gas oxygen sensor downstream of the catalyst. A feedback loop controls the air/fuel ratio as a function of the output signal from the exhaust gas oxygen sensor. The feedback gain is increased from low gain to high gain and then operational parameters are examined. In a first version the amplitude of the exhaust gas oxygen sensor is used as an indication. In a second version, the amplitude of the exhaust gas oxygen sensor reaches a predetermined limit and then the feedback gain is examined. In a third version, limit cycle operation is reached and the frequency of the limit cycle is examined with respect to a predetermined frequency.
A method of detecting catalyst malfunction in a vehicle uses an exhaust gas oxygen sensor downstream of the catalyst. A feedback loop controls the air/fuel ratio as a function of the output signal from the exhaust gas oxygen sensor. The feedback gain is increased from low gain to high gain and then operational parameters are examined. In a first version the amplitude of the exhaust gas oxygen sensor is used as an indication. In a second version, the amplitude of the exhaust gas oxygen sensor reaches a predetermined limit and then the feedback gain is examined. In a third version, limit cycle operation is reached and the frequency of the limit cycle is examined with respect to a predetermined frequency.
en
European Patent Office
EP0521641
EP 0521641
F02D 41/14
F01N 09/00
Method and apparatus for detecting catalyst malfunctions
Method and apparatus for detecting catalyst malfunctions - European Patent Office - EP 0521641 A1
Method and apparatus for detecting catalyst malfunctions - European Patent Office - EP 0521641 A1
Adobe PDF Library 8.0
"EP0521641"; "EP 0521641"; "F02D 41/14"; "F01N 09/00"; "Method and apparatus for detecting catalyst malfunctions"
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EP
0521641
A1
1993-01-07
92305697
1992-06-22
US
724399
1991-06-28
F02D 41/14
F01N 09/00
FORD MOTOR COMPANY LIMITED
FORD FRANCE S. A.
FORD-WERKE AKTIENGESELLSCHAFT
Hamburg, Douglas Ray
Cook, Jeffrey Arthur
Messulam, Alec Moses et al
Method and apparatus for detecting catalyst malfunctions
Verfahren und Vorrichtung zum Feststellen von Katalysator-Funktionsstörungen
Method and apparatus for detecting catalyst malfunctions
Procédé et appareil pour détecter les défaillances d'un catalyseur
A method of detecting catalyst malfunction in a vehicle uses an exhaust gas oxygen sensor downstream of the catalyst. A feedback loop controls the air/fuel ratio as a function of the output signal from the exhaust gas oxygen sensor. The feedback gain is increased from low gain to high gain and then operational parameters are examined. In a first version the amplitude of the exhaust gas oxygen sensor is used as an indication. In a second version, the amplitude of the exhaust gas oxygen sensor reaches a predetermined limit and then the feedback gain is examined. In a third version, limit cycle operation is reached and the frequency of the limit cycle is examined with respect to a predetermined frequency.
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