SYSTEM TO IMPROVE AFTER-TREATMENT REGENERATION

摘要

Exemplary methods, devices, and/or systems are suitable for regenerating a plurality of after-treatment units (228). An exemplary method includes selecting less than all of a plurality of after-treatment units (228) and adjusting air to fuel ratio for less than all of a plurality of combustion chambers of an engine (210) to thereby cause the selected after-treatment units (228) to receive exhaust having hydrocarbon and oxygen concentrations that favor regeneration of the selected after­treatment units (228). Other exemplary methods, devices and/or systems are also disclosed.