Device for determining the abnormal degree of deterioration of a

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

1996-04-10

1998-06-16

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60276, F01N 320

Patent

active

057653704

ABSTRACT:
A device for determining the excessive degree of deterioration of catalyst of a catalytic converter arranged in an internal combustion engine exhaust system is disclosed. The device comprises a purification ability determining unit for determining a current purification ability of the catalyst and a temperature sensor for determining a current temperature of the catalyst. Therefore, a threshold of the purification ability which corresponds to the excessive degree of deterioration of the catalyst is determined in accordance with the current temperature of the catalyst. An appraisal value is determined in accordance with a difference between the threshold and the current purification ability. It is determined that the degree of deterioration of the catalyst is excessive when the integration value of the appraisal value exceeds a predetermined value.

REFERENCES:
patent: 5179833 (1993-01-01), Kuroda et al.
patent: 5325664 (1994-07-01), Seki et al.
patent: 5577382 (1996-11-01), Kihara et al.

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