Originally Posted by
senix
ok, maybe a little over the top but is refers to the cleaning of the DPF to turn the trapped soot into ash and then blow it out the pipes. That is why on the newer trucks you don't see that black smoke anymore. Emissions.
Your statement is partially correct. The combustible soot trapped in the filter is turned into CO and CO2 gas which passes thru the filter. The remaining uncombustible soot is trapped in the filter as ash and must be cleaned from the filter by a special machine aka large vacuum cleaner.
Also, your original article described the regeneration of an off-highway machine's dpf by utlilizing electric heating elements OR an exchange program. On-highway vehicles increase the DOC temp by injecting hydrocarbons into the dpf thus causing an exothermic reaction. Soot oxidizes at a nearly 3 times the temperature during active regeneration as opposed to passive regeneration.