METHOD AND SYSTEM FOR MAINTAINING AFTERTREATMENT EFFICIENCY

摘要

A method is provided for compensating for factors affecting particulate matter accumulation within an aftertreatment element (20) of an engine exhaust system (16). The method comprises determining rate of change of flow resistance through the aftertreatment element (20) with time. Regeneration is periodically initiated to reduce particulate matter accumulation within the aftertreatment element (20). Rate of change of flow resistance through the aftertreatment element (20) over time is correlated with at least a model of particulate matter accumulation within the aftertreatment element (20) and a model of regeneration frequency of the aftertreatment element (20), based on predetermined values for particulate matter accumulation and regeneration frequency. Action, at least including increasing regeneration frequency, is initiated to compensate for an increased rate of particulate matter accumulation in the aftertreatment element (20).