NOX catalyst exhaust feedstream control system
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United States of America Patent
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Jul 23, 2002
Grant Date -
N/A
app pub date -
Nov 15, 2000
filing date -
Nov 15, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved method of 'adaptive' control that optimizes NO.sub.x conversion efficiency while minimizing fuel consumption. This method limits the NO.sub.x level in the feedstream to a NO.sub.x catalyst to a level that the catalyst can process by adjusting certain engine parameters, namely exhaust gas recirculation percentage, air-to-fuel ratio, and spark ignition timing in a spark-ignition engine or fuel injection timing in a compression-ignition engine. This method results in improved fuel efficiency over previous methods of controlling NO.sub.x emissions by allowing longer periods of lean operations.
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