STRATEGY FOR SCHEDULING LNT REGENERATION

摘要

A lean NOX trap (105) is a diesel exhaust aftertreatment system (103) is selectively denitrated when a measure relating to NOX loading, remaining NOX storage capacity, or performance of the exhaust aftertreatment system (103) or a portion thereof comprising the lean NOX trap (105) reaches a critical value. The critical value is determined based in part on conduciveness of current conditions to regenerating the lean NOX trap (105). Accordingly, denitration is scheduled based on a balance between the urgency of the need to regenerate and conduciveness of current conditions to regeneration. The stopping point for regeneration can also be selected based on conduciveness of current conditions to regeneration. The method maintains exhaust aftertreatment performance while reducing regeneration fuel penalty.