Catalyst degradation determination apparatus and method

Details Catalyst degradation determination apparatus and method Catalyst degradation determination apparatus and method

1996-11-20

1998-12-22

Tung, T.

Electrolysis: processes, compositions used therein, and methods

Electrolytic analysis or testing

For oxygen or oxygen containing compound

60276, 60277, 60299, 60302, 204424, 204425, 2057905, 2057915, G01N 27407

Patent

active

058513760

ABSTRACT:
A catalyst degradation determination apparatus having O.sub.2 sensors provided at the upstream and downstream of a catalyst, detects degradation of the catalyst by, during A/F ratio feed-back control since an engine has been started, comparing an integrated value of output values from the upstream O.sub.2 sensor with that of output values from the downstream O.sub.2 sensor. Upon starting integration of the output values from the respective O.sub.2 sensors, change of activated status of the catalyst is judged. If the status of the catalyst is approximately the same as a previous status, the integration is started with previous integrated values. On the other hand, if the status of the catalyst is different from the previous status, the previous integrated values are reset, and the integration of the output values from the respective O.sub.2 sensors is started from the beginning. This prevents erroneous catalyst degradation determination.

REFERENCES:
patent: 5472580 (1995-12-01), Kennard et al.

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