9 Aftertreatment System

In order to meet current emissions regulations, the traditional muffler has been replaced by a new Aftertreatment Device (ATD). This device consists of a Diesel Oxidation Catalyst (DOC) and a Diesel Particulate Filter (DPF). Together these two components burn off collected particulate matter in a process called “regeneration.” The key to successful regeneration is high exhaust temperature for an extended period of time. Without adequate temperatures for regeneration, the filter will continue to trap particulates and eventually plug. In order to avoid plugging, Detroit Diesel has designed an actively regenerated Aftertreatment System (ATS). See Figure " Aftertreatment System Schematic" .