System and method for diagnosing deterioration of NOx-occluded c

Details System and method for diagnosing deterioration of NOx-occluded c System and method for diagnosing deterioration of NOx-occluded c

1999-07-02

2000-11-14

Wolfe, Willis R.

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60274, 60276, 60285, F01N 300

Patent

active

061453056

ABSTRACT:
A deterioration diagnosing system for a NOx-occluded catalyst comprises an inlet NOx concentration estimating unit which estimates NOx concentration at an inlet part of the catalyst; an outlet NOx concentration detecting unit which detects NOx concentration at an outlet part of the catalyst; and a deterioration degree judging unit which judges a deterioration degree of the catalyst in accordance with a rate of the minimum value of NOx concentration detected by the detecting unit for a predetermined period to a value of NOx concentration estimated by the estimating unit at the time when the minimum value of NOx concentration is detected. The predetermined period is a period between a time when the engine exhaust gas shows the stoichiometric and/or richer air/fuel ratio and a subsequent time when the engine exhaust gas shows the stoichiometric and/or richer air/fuel ratio.

REFERENCES:
patent: 5381657 (1995-01-01), Takizawa et al.
patent: 5715679 (1998-02-01), Asanuma et al.
patent: 5848530 (1998-12-01), Matsuoka et al.
patent: 5953907 (1999-09-01), Kato et al.
patent: 5979161 (1999-11-01), Hanafusa et al.

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