Method and arrangement for desulfurization of NOx reservoir catalysts
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United States of America Patent
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-
Dec 26, 2000
Grant Date -
N/A
app pub date -
Jul 20, 1998
filing date -
Jul 19, 1997
priority date (Note) -
Expired
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Importance
Abstract
By measuring the exhaust gas temperature with temperature sensors located immediately before and after an NOx reservoir in the exhaust gas line of an internal combustion engine, and by suitable control of rich-lean operation, an NOx reservoir catalyst can be heated above the desulfurization temperature. Immediately after desulfurization normal operation is restored in the case of a Diesel engine, whereas, in the case of an Otto engine, .lambda.=1 operation is carried out briefly before returning to normal rich-lean operation.
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