UENR4490-01 27 Engine Operation Illustration 23 g03706448 Typical example (1) Exhaust intake connection (2) Diesel Oxidation Catalyst (DOC) (3) Diesel Particulate Filter (DPF) (4) Diesel Exhaust Fluid (DEF) injector (5) Exhaust outlet connection (6) Selective Catalytic Reduction (SCR) system The Clean Emissions Module (CEM) for the engine consists of the following components. The DOC oxidizes the carbon monoxide and the hydrocarbons that are not burnt in the exhaust gas into carbon dioxide and water. The DOC also acts on the oxides of nitrogen to increase the nitrogen dioxide fraction for improved efficiency of the SCR system.
The DOC is a through flow device that will continue to operate during all normal engine operating conditions. Diesel Oxidation Catalyst (DOC) Diesel Particulate Filter (DPF) Selective Catalytic Reduction (SCR) system The wall flow Diesel Particulate Filter (DPF) collects all solid particulate matter in the exhaust gas.