Quote:
Originally Posted by Cobb
Gasoline engines I thinkwould be easy to add a cat to clean it up, not sure about the diesels. I hear the system collects the soot, then burn it off every so often in a regen cycle. I doubt something like that could be fitted to a diesel lawn mower engine.
|
There are passive DPFs out there that do not require active regeneration. They do not work in light load applications because there is not enough engine heat to oxidize the collected soot in the DPF. Soot oxidation requires 600F minimum. If you installed a DPF on your diesel lawn mower and kept the engine loaded enough to maintain 600F+ EGT, it would probably work.
A modern, active DPF actually has two parts: the catalyst and the DPF. When soot buildup needs to be burned off, the engine supplies raw diesel fuel, either sprayed into the exhaust post-turbocharger (separate injector or "doser") or sprayed in cylinder via fuel injectors during the exhaust stroke. This fuel is carried by the hot exhaust into the catalyst where it hits the platinum and oxidizes, making LOTS of heat in order to oxidize the soot collected in the DPF. Normal active regeneration temps are regulated at ~1000-1200F, where soot is
rapidly oxidized - about 20 minutes at this temperature clears out most of the collected soot.