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.]regenerating the particulate filter;determining a reductant amount released by the particulate filter;discontinuing said regeneration when said reductant amount is greater than a predetermined value. [7.]regenerating the particulate filter;determining an initial reductant a

[What is claimed is:] [1.]regenerating the particulate filter;determining a reductant amount released by the particulate filter;discontinuing said regeneration when said reductant amount is greater than a predetermined value. [7.]regenerating the particulate filter;determining an initial reductant amount based on operating conditions;generating an adjusted reductant amount by adjusting said initial reductant amount when regenerating the particulate filter; anddiscontinuing said regeneration when said adjusted reductant amount is less than a predetermined value.