Exhaust gas purifier for engines

Details Exhaust gas purifier for engines Exhaust gas purifier for engines

1997-07-28

2000-07-04

Denion, Thomas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60277, 60286, F01N 300

Patent

active

060821019

ABSTRACT:
An exhaust gas purifier equipped with a catalyst converter including an early-activation catalyst converter and a pre-catalyst converter for purifying harmful exhaust gas discharged form an engine evaluates a characteristic of the exhaust gas purification rate of the catalyst converter from the cooled condition to the warmed condition of a catalyst to diagnose a deterioration of the early-activation function of the catalytic converter. The purifier compares a rising part of the evaluated characteristic of the exhaust gas purification rate with a rising part of a reference characteristic and judges that the early-activation catalyst converter is deteriorated if a difference between these rising parts is beyond a predetermined value, and compares a steady state part of the evaluated characteristic of the exhaust gas purification rate with a steady state part of the reference characteristic and judges that the pre-catalyst converter is deteriorated if a difference between these steady state parts is beyond a predetermined value.

REFERENCES:
patent: 5377484 (1995-01-01), Shimizu
patent: 5522219 (1996-06-01), Orzel et al.
patent: 5591905 (1997-01-01), Fujimoto et al.
patent: 5865026 (1999-02-01), Davey et al.

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