How does a DPF function?

I have a 2001 Volkswagen Passat 1.9 TDI diesel. I understand that the car needs to travel a reasonable distance, say 20 or 30 miles, to ensure that the DPF does not clog. Do I presume that the diesel particles then go into the atmosphere?

Asked on 15 September 2012 by JP, Cheadle Hulme

Answered by Honest John

What a DPF does is collect unburned hydrocarbons (soot) on start up, then combust them fully later in the car's journey when the engine and the filter get hot enough. The problems associated with repeated short runs from cold are due to the DPF not getting hot enough. It then fills up with soot to the extent that it can't burn it off, clogs up and the trouble begins.

Tags: dpf diesel engines diesels

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