Diesel particle filters
Modern diesel particle filters are engineered in closed or open versions. In closed particle filters, also known as surface filters, exhaust gases are filtered via porous ceramic substrate. As the filter gradually fills with particles, the engine management system monitors increases in exhaust backpressure. Thermal regeneration of the filter takes place at a specified time.
Particle oxidation catalysts, also known as open filters, have a lower separation rate (< 50%) and filtration occurs inside a metal structure. Active regeneration is not necessary for this filter type but it is unsuitable for high specific engine performance.
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