DOC and the DPF are honeycomb ceramic filters. However, unlike the DOC, the DPF is a wall-flow filter that traps any remaining soot that the DOC couldn't oxidize. The soot remains in the DPF until it is regenerated either passively or actively.
The diesel exhaust aftertreatment system has arisen to solve one problem; the difficult task of removing harmful particulate matter from diesel engine emissions.
Untreated emissions from a diesel engine contains a cocktail of harmful chemicals and particulate matter, however today’s system can reduce this down to harmless substances, oxygen, and water.
The exhaust aftertreatment devices that are applied to vehicles are Diesel Oxidation Catalysts (DOC), Diesel Particulate Filters (DPF) and Selective Catalytic Reduction (SCR) catalysts.
Using a combination of physical mechanisms and chemical reactions these systems can, under the right conditions, achieve near complete removal of particulates and harmful gases.
13 апр 2022
