Device for determining the abnormal degree of deterioration of a catalyst
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United States of America Patent
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-
Nov 9, 1999
Issued Date -
N/A
app pub date -
Apr 17, 1998
filing date -
Apr 12, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for determining the abnormal 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 grasping unit for grasping a current purification ability of the catalyst and a temperature sensor for grasping a current temperature of the catalyst. Therefore, a threshold of the purification ability which corresponds to the abnormal 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 abnormal when the integration value of the appraisal value exceeds a predetermined value.
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