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SESD | Lots of misunderstandings in the diesel and emissions world today.
DEF does almost nothing for smoke, urea reacts with nitrous oxide particles, or Nox emmisions, this is the main thing they are trying to eliminate thus far.
The DPF catches the heavy particulate matter or smoke
Fuel is injected into the exhaust stream in some form, as far as over fueling an injector or having a separate fuel injector in the exhaust, this heats up the SCR chamber in helping burn off the Nox and its used to heat the DPF to burn some of the particulate matter out extending the service life of the DPF.
Of course as technology and research grows and each manufacture comes up with the next best thing, higher compression, better cylinder burn ect ect. Emission development i feel is doing wonders for the diesel engine efficiency, however its the tack on garbage in the exhaust that makes them unreliable. Along with the tailpipe emission looking at overall carbon footprint, comes lots of garbage inside the engines also making them less reliable, lower weight oils, adjustable lifters, cams, actuated piston coolers ect ect. All these things effect engine drag and overall efficiency by a few cc's of fuel, but the companies can multiple that accross 500k+ miles and hundreds to thousands of units and claim lower fuel usage | |
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How modern Diesel Emissions work, paging Silverluv75 and others
