Method of judging deterioration of catalytic converter for purif

Details Method of judging deterioration of catalytic converter for purif Method of judging deterioration of catalytic converter for purif

1997-11-19

1999-08-17

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60285, F01N 320

Patent

active

059376384

ABSTRACT:
A deterioration of a catalytic converter for purifying an exhaust gas produced by burning a mixture of a fuel and air in an internal combustion engine, for example, is judged by supplying the exhaust gas to the catalytic converter, detecting the amount of a predetermined component of the exhaust gas which has passed through the catalytic converter with an exhaust gas sensor disposed downstream of the catalytic converter, calculating a target air-fuel ratio for the exhaust gas to be supplied to the catalytic converter for achieving a predetermined emission purifying capability of the catalytic converter based on a detected output signal from the exhaust gas sensor, and judging a deteriorated state of the catalytic converter based on the calculated target air-fuel ratio.

REFERENCES:
patent: 5127225 (1992-07-01), Nada
patent: 5134847 (1992-08-01), Ogawa et al.
patent: 5303548 (1994-04-01), Shimizu et al.
patent: 5737916 (1998-04-01), Mitsutani
patent: 5848527 (1998-12-01), Mitsutani

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