Catalyst monitoring using a hydrocarbon sensor
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United States of America Patent
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Oct 20, 1998
Grant Date -
N/A
app pub date -
Feb 24, 1997
filing date -
Feb 24, 1997
priority date (Note) -
Expired
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Abstract
A hydrocarbon sensor measures the tail pipe hydrocarbon concentration emitted by an internal combustion engine to determine whether a catalyst has deteriorated beyond a predetermined point with respect to reducing hydrocarbon emissions. Catalyst performance is measured following an engine cold start when hydrocarbons are emitted and compared to catalyst performance when operating temperature has been reached to determine catalyst efficiency.
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