APPARATUS, SYSTEM, AND METHOD FOR DETERMINING THE DEGRADATION OF AN SCR CATALYST

摘要

According to one representative embodiment, an apparatus (130) for determining the degradation of a selective catalytic reduction (SCR) catalyst (152) of an engine exhaust aftertreatment system (100) includes a system properties module configured to store at least one system dynamics property value of the exhaust system at a first time and receive the at least one system dynamics property value of the exhaust aftertreatment system at a second time subsequent to the first time. The apparatus also includes a system dynamics module (768) configured to determine a storage capacity of the SCR catalyst based on a comparison between the at least one system dynamic property value at the first time and the at least one system dynamic property value at the second time. Additionally, the apparatus includes an SCR catalyst degradation factor module (368) configured to determine an SCR catalyst degradation factor (700, 710, 762, 766) based at least partially on the storage capacity of the SCR catalyst.