Apparatus and method for monitoring NOx storage catalytic converters
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United States of America Patent
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-
Dec 31, 2002
Issued Date -
N/A
app pub date -
May 14, 2001
filing date -
Nov 12, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and apparatus is provided for monitoring the operation of a NO.sub.x storage catalytic converter in the exhaust stream of an internal combustion engine. The NO.sub.x content of the gas stream upstream and downstream of the catalytic converter is measured and used to determine storage efficiency. This is compared to a threshold value, and if the threshold value is not met a regeneration process is performed. The storage value is measured after regeneration to determine if the catalytic converter is faulty.
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