Apparartus for detecting deterioration of catalysts

Details Apparartus for detecting deterioration of catalysts Apparartus for detecting deterioration of catalysts

1995-09-06

1996-06-25

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, F01N 328

Patent

active

055288987

ABSTRACT:
A catalyst deterioration determination is performed in two stages. In the first stage of determination, an amplitude of an output signal from a downstream oxygen sensor is detected and this amplitude is compared with a reference value in order to determine possible deterioration in a catalyst. When correct performance is expected, while taking into account variations (amplitude and response) in the upstream and downstream oxygen sensors, then the detection in a second stage is omitted. However when possible catalyst deterioration may be present, the determination at the seconds stage is performed. After adjusting the response of the upstream oxygen sensor to the characteristic of the slowest response, the total response delay time of the downstream sensor is obtained within a specified amount of time, and this sum then is compared with a reference value indicating catalyst deterioration. A final determination is made as to whether catalyst deterioration is present.

REFERENCES:
patent: 4739614 (1988-04-01), Katsuno et al.
patent: 5220788 (1993-06-01), Kurita et al.

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