| 摘要 |
A method and apparatus for operating a Lean NOx Trap in an exhaust line of an Internal Combustion Engine comprising the steps of: performing a DeSOx regeneration event of the Lean NOx, Trap (LNT) by executing a plurality of rich combustion phases, each combustion phase being followed by a lean combustion phase, monitoring an elapsed time value (Current Lean Time) 502 starting from the beginning of a lean combustion phase of the DeS0x regeneration event, adjusting a predetermined fuel quantity value (Post Base) 505 of each fuel Post-injection to be injected during the lean combustion phase of the DeS0x regeneration event using a correction factor (Post Correction) 504 determined on the basis of the elapsed time value (Current Lean Time) 502 and of a time length value (Last Rich Time) 501 of a previous rich combustion phase of the DeS0x regeneration event, and injecting the adjusted fuel Post-injection quantity value (PostShaped) 507. The invention improves temperature management during DeSOx regeneration events, regeneration efficiency, and LNT trap ageing.
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