1 Exhaust gas from engine
2 Oxidation catalytic converter
3 Filtered exhaust gas
4 Diesel particulate filter
5 Catalytically cleaned exhaust gas
The diesel particulate filter is designed as a separate component and is downstream of the oxidation catalytic converter.
The particulate filter is a honeycomb structure, the walls of which are made of porous silicon carbide. In addition, the individual ducts are sealed at one side and offset to each other.
After combustion has occurred, some diesel particulates may still be present in the exhaust gas. As part of the filtration process, the exhaust gases loaded with diesel particulate matter flow into the diesel particulate filter and are then forced to flow through the porous walls as a result of the staggered position of the sealed channels. The build up of diesel particulate matter in the intermediate chambers of the porous walls increases the filtration effect still further.