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Lean NOx Traps (LNT), as a critical aftertreatment device for lean burn engines, require active control to manage its storage and purge cycles. In this paper, optimal air-to-fuel ratio profiles are pursued in LNT operation cycles with focus on the purge phase in which the stored NOx is neutralized by a rich air-to-fuel ratio mixture. It is shown that allowing the AFR to vary during the purge phase...
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