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CRT principle (Continuous Regeneration Trap)
The CRT effect (Continuous Regeneration Trap) is based on chemical reactions which take place in the ex-
haust gas aftertreatment system of the engine. The diesel oxidation catalyst (DOC) first produces nitrogen
dioxide (NO
) from the nitrogen monoxide (NO) in the exhaust gas. Sooty deposits in the DPF are steadily
2
burnt off with the aid of the NO
thus gained (see figure). This effect is also referred to as passive regenera-
2
tion, which in contrast to active regeneration does not require any additional energy .
MS15065/01E 2019-01 | DPF System | 73
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