초록 ▼

A method for controlling reductant added to an exhaust of an engine having a lean NOx catalyst and a particulate filter adjusts a reductant amount during particulate filter regeneration. The method adjusts the reductant amount to account for reducing agents released from the particulate filter that

A method for controlling reductant added to an exhaust of an engine having a lean NOx catalyst and a particulate filter adjusts a reductant amount during particulate filter regeneration. The method adjusts the reductant amount to account for reducing agents released from the particulate filter that are experienced by the lean NOx catalyst. In addition, management of particulate filter regeneration is based on both an estimated amount of stored particles and conditions of the lean NOx catalyst. In this way, operation of both the particulate filter and the lean NOx catalyst can be optimized. Also, termination of particulate filter regeneration is determined based on operating conditions.

대표청구항 ▼

[ What is claimed is:] [1.]1. A control method for an engine having a particulate filter communicating with an engine exhaust upstream of a catalyst, the method comprising the steps of:determining an initial reductant amount based on operating conditions;adjusting said initial reductant amount when

[ What is claimed is:] [1.]1. A control method for an engine having a particulate filter communicating with an engine exhaust upstream of a catalyst, the method comprising the steps of:determining an initial reductant amount based on operating conditions;adjusting said initial reductant amount when regenerating the particulate filter;adding reductant to the exhaust based on said adjusted reductant amount during said regeneration; andadding reductant to the exhaust based on said initial reductant amount otherwise.