Both SCR and AEGR will have their moments and since this is the
MaxxForce Forum, please find attached the MaxxForce brochure that describes the process. (Bottom of article)
Commonly known in its short form as ; "
ReGen"; these are the processes and stages of operation during the procedure.
The process is described in all three phases;
Passive
Active
Manual (Parked Regeneration)
We are also going to see in this document that the ReGen is largely automated and for the most part will need little operator interaction unless notified on the instrument panel that a manual or parked ReGen is required. Since I don't operate one of these vehicles, I'm not at all certain how the pre-existing conditions manifest themselves. I can only surmise by the documentation and other web based articles that it is in fact derived from the ingestion of the engine's own lubricating oil.
Throughout the process, you will see that the AEGR system will remain in compliance with 2010 emissions. In the last phase of ReGen schedule (step 4) the instruction is to shut the vehicle down and have it towed to a service center. Obviously something would have to be very broken for a DPF to become over loaded with what is called ash.
How much ash is there actually? I would expect not much at all since these systems would become continuously over whelmed but the ash can be said to exist in minute or trace amounts.
No one is going to want to see an ash cloud fly out of the tailpipe as ash is not a by product that is allowed in the exhaust stream.
In SCR speak they call it large particles however those are trapped by the DPF as well after passing the DOC. Any DPF can be overwhelmed to the point of failure. I expect that in this extreme case the recommendation is the same and that's to have the vehicle towed and serviced.
DEF in of itself does not treat ash but is atomized by the dosing valve which allows gasses to be processed more efficiently in the SCR further downstream.
Here are some reference materials for additional reading:
Investigation into Ash Loading and Its Relationship to DPF Regeneration Method (SAE International)
Microscopy investigations of ash and particulate matter accumulation in diesel particulate filter surface pores (MIT)
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Linear Mode
