Deterioration diagnostic system of exhaust gas purifying...

Power plants – Internal combustion engine with treatment or handling of... – Having sensor or indicator of malfunction – unsafeness – or...

Reexamination Certificate

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C060S274000, C060S285000

Reexamination Certificate

active

07739868

ABSTRACT:
A deterioration diagnostic system of an exhaust gas purifying catalyst includes: an upstream side switching frequency calculator calculating the number of times of switching on the upstream side; a reference value calculator calculating a downstream side rich/lean determination level having a first width; a downstream side rich/lean determination level adjuster setting the first width to a second larger width when the number of times of switching on the upstream side is smaller than a predetermined value; a downstream side switching frequency calculator calculating the number of times of switching on the downstream side; a frequency ratio calculator calculating a frequency ratio between the number of times of switching on the downstream side and the number of times of switching on the upstream side; and a deterioration determiner determining the deterioration of the exhaust gas purifying catalyst when the frequency ratio is larger than a predetermined value.

REFERENCES:
patent: 5732552 (1998-03-01), Matsumoto et al.
patent: 2006/0137326 (2006-06-01), Saito et al.
patent: 8-218853 (1996-08-01), None

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