Lean catalyst and particulate filter control system and method
AssigneeFord Global Technologies, LLC
InventorJohn David Russell
Life of this patent
Estimating the term…
Abstract
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.
Claims22
A method for managing regeneration of a articulate filter communicating with an engine exhaust upstream of a catalyst, the method comprising:
- 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.
A method for managing regeneration of a particulate filter communicating with an engine exhaust upstream of a catalyst, the method comprising:
- 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;
- and
- discontinuing said regeneration when said adjusted reductant amount is less than a predetermined value.
An article of manufacture comprising:
- a computer storage medium having a computer program encoded therein for managing regeneration of a particulate filter communicating with an engine exhaust upstream of an emission control device, said computer storage medium comprising:
- code for regenerating the particulate filter;
- code for determining a reductant amount released by the particulate filter;
- and
- code for discontinuing said regeneration when said reductant amount is greater than a limit value.
A system for use with an engine, the system comprising:
- a particulate filter;
- a catalyst coupled downstream of the particulate filter;
- and
- a controller regenerating the particulate filter, determining a reductant amount released by said particulate filter, and discontinuing said regeneration when said reductant amount is greater than a predetermined value.
Dependencies are inferred from the claim text.