Device for determining the degree of deterioration of a catalyst

Details Device for determining the degree of deterioration of a catalyst Device for determining the degree of deterioration of a catalyst

1996-09-18

1997-11-04

Dombroske, George M.

Measuring and testing

Simulating operating condition

Marine

73 2332, 73116, 60277, 364431051, 364431062, 340438, F01N 320, G01N 27409, F02D 4122

Patent

active

056842481

ABSTRACT:
A device for determining the degree of deterioration of catalyst of a catalytic converter arranged in an internal combustion engine exhaust system is disclosed. The device comprises an O.sub.2 sensor which is arranged in the internal combustion engine exhaust system downstream of the catalytic converter. The O.sub.2 sensor has the low oxidization and deoxidization ability on the detection surface thereof. The device determines the degree of deterioration of the catalyst by comparing a value in connection with an extra O.sub.2 concentration on the basis of a current output of the O.sub.2 sensor in the exhaust gas at a predetermined air-fuel ratio with a basic value.

REFERENCES:
patent: 5228335 (1993-07-01), Clemmens et al.
patent: 5303580 (1994-04-01), Schneider et al.
patent: 5365216 (1994-11-01), Kotwicki et al.
patent: 5408215 (1995-04-01), Hamburg
patent: 5428956 (1995-07-01), Maus et al.
patent: 5431011 (1995-07-01), Casarella et al.

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