Closed loop control for desulfating a NO.sub.x trap
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United States of America Patent
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Nov 16, 1999
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N/A
app pub date -
Sep 2, 1997
filing date -
Sep 2, 1997
priority date (Note) -
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Abstract
A system and method for desulfating an NO.sub.x trap utilizes a closed loop control of the air-to-fuel (A/F) ratio to accurately maintain a precise A/F ratio during desulfation. An oxygen sensor is positioned in the middle of the trap to provide an actual A/F ratio measurement, which is subsequently compared to a target A/F ratio to generate a correction signal to adjust operation of the engine's fuel injector(s). The trap oxygen sensor can also be used to adaptively update engine state conditions for a more precise switch-over to a trap regeneration phase.
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