Method and apparatus for measuring the performance of an emissions control device
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United States of America Patent
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Oct 7, 2003
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N/A
app pub date -
Mar 17, 2000
filing date -
Mar 17, 2000
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Abstract
A method and apparatus for controlling the operation of a 'lean-burn' internal combustion engine in cooperation with an exhaust gas purification system having an emissions control device capable of alternatively storing and releasing an exhaust gas constituent, such as NO.sub.x, when exposed to exhaust gases that are lean and rich of stoichiometry, respectively, wherein a measure of the efficiency of the device to remove the exhaust gas constituent from engine exhaust gas is determined, and a purge event for releasing previously-stored NO.sub.x is initiated when the efficiency measure falls below a threshold value.
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