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Old 05-26-2019, 03:46 PM   #1
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Default Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

Specifically, under what operating conditions do "Passive" regenerations occur? Please provide manufacturer's documents to support your claim(s).
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Old 05-26-2019, 05:42 PM   #2
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Default Re: Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

I might not be a Sprinter "Guru" - but in can tell you that after over 70,000 miles monitoring the exhaust gas temperature going into and out of the DPF the Sprinter does not do passive regeneration. The DPF is located too far from the engine combustion to get hot enough for passive regeneration. Other diesel engines, including the newest from Mercedes have the DPF mounted right on the engine exhaust so it gets hot enough for passive regeneration.

Let's hear from some Sprinter gurus.
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Old 05-26-2019, 08:09 PM   #3
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Default Re: Gurus ONLY Educate me about passive regenerations.

PASSIVE REGENERATION:

Passive regeneration occurs when the exhaust temperatures are naturally high enough (no additional heat is needed from the DOC) to oxidize the soot in the DPF faster than it is collected.
Passive regeneration typically occurs when the temperature of the DPF is above 572F (300C). This occurs during highway driving or when driving with heavy loads.
Since passive regeneration occurs naturally, it is considered to be normal engine operation. No fuel is added to the exhaust stream during passive regeneration.


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Old 05-26-2019, 08:13 PM   #4
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Default Re: Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

I suppose you could start with the basics. Terminology is a good starting point. So here's a few articles that define active and passive and manual regeneration.

https://www.vehicleservicepros.com/v...odes-explained
https://www.perkins.com/en_GB/produc...eneration.html
https://www.dieselnet.com/tech/dpf_sys.php
https://www.turbodieselregister.com/...ration.260723/ (take a look at the third post in the thread)
https://www.knowyourparts.com/techni...culate-filter/
https://en.wikipedia.org/wiki/Diesel_particulate_filter
https://www.fullbay.com/diesel-parti...ter-dpf-regen/

That should do for a start. Having read all of these links (at least the relevant parts), here's my own description.

The first thing to keep aware of is that the terms "active" and "passive" have to be thought of in terms of what the engine is doing to accomplish the regen. They do NOT relate to what any person has to do.

Passive systems regen - burn off accumulated particulates - in the normal course of operation. The whole system is designed in such a way that the DPF gets hot enough on it's own to burn (technically, oxidize) the trapped particulates. In a vehicle, this might be accomplished by locating the DPF close to the engine so that it is not cooled by airflow around the vehicle, or by using a catalyst so that lower temperatures are adequate for oxidation to occur.

Active regen means that the engine management computer has to create the hot conditions in the DPF so that the particulates can oxidize. This can be done through electric heating or by injecting additional fuel into the exhaust stream to burn there and increase exhaust temperatures.

Manual or stationery regen requires human intervention. Some machinery will prompt the operator to take some action to begin a regen. On vehicles, this may require attaching a diagnostic computer to begin the manual regen.

Now let's apply this to Sprinters. From what I have read, Sprinters are not designed with a passive regen system. They have active and manual systems for a regen. The active system operates via various sensors connected to the engine and transmission control modules. When conditions are right, the Sprinter will inject additional fuel during the exhaust stroke to burn in the exhaust system and raise the temperature in the DPF. And a regen can be activated while the vehicle is in the shop via the Xentry diagnostic system (and possibly other third party diagnostic systems).

Now I realize this all fails your requirement for official Mercedes documentation. That's partly because Mercedes doesn't publish much information for general consumer use. Their general operating philosophy is that end-users don't need to know this stuff. It's only for trained technicians and is likely subject to some non-disclosure agreements. So it's hard or impossible to find this kind of technical design information. If that means I've wasted my time, so be it.

I still learned something by going through the process of attempting to answer your question, so I don't consider it a waste of time.
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Old 05-26-2019, 09:29 PM   #5
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Default Re: Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

The key info was in one of PTHELAND's links:

"Diesel particulate matter burns when temperatures above 600 degrees Celsius are attained."

The DPF on a Sprinter never gets close to 600C until fuel is added during a regeneration cycle. I monitor the temps with my UltraGauge.
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Old 05-26-2019, 11:42 PM   #6
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Default Re: Gurus ONLY Educate me about passive regenerations.

Quote:
Originally Posted by CJPJ View Post
PASSIVE REGENERATION:

Passive regeneration occurs when the exhaust temperatures are naturally high enough (no additional heat is needed from the DOC) to oxidize the soot in the DPF faster than it is collected.
Passive regeneration typically occurs when the temperature of the DPF is above 572F (300C). This occurs during highway driving or when driving with heavy loads.
Since passive regeneration occurs naturally, it is considered to be normal engine operation. No fuel is added to the exhaust stream during passive regeneration.


http://www.nissantechnicianinfo.mobi...te_Filter.html
This interesting. So, 572F applies to the Sprinter as well???
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Old 05-26-2019, 11:45 PM   #7
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Default Re: Gurus ONLY Educate me about passive regenerations.

Quote:
Originally Posted by CJPJ View Post
PASSIVE REGENERATION:

Passive regeneration occurs when the exhaust temperatures are naturally high enough (no additional heat is needed from the DOC) to oxidize the soot in the DPF faster than it is collected.
Passive regeneration typically occurs when the temperature of the DPF is above 572F (300C). This occurs during highway driving or when driving with heavy loads.
Since passive regeneration occurs naturally, it is considered to be normal engine operation. No fuel is added to the exhaust stream during passive regeneration.


http://www.nissantechnicianinfo.mobi...te_Filter.html

You monitor your temps, what do you normally run while highway driving and did insulating your DPF increase the temperatures?
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Old 05-27-2019, 12:04 AM   #8
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Default Re: Gurus ONLY Educate me about passive regenerations.

Quote:
Originally Posted by Bobnoxious View Post
You monitor your temps, what do you normally run while highway driving
Never monitored the DPF temps, ..I do have the scangage II but never set it to exhaust temp.
Quote:
and did insulating your DPF increase the temperatures?
Estimate it certainly would! Apparently around 450f oxidation starts, 572 as per graphic the rate becomes more efficient with the increased temperatures

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Old 05-27-2019, 02:00 AM   #9
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Default Re: Gurus ONLY Educate me about passive regenerations.

Quote:
Originally Posted by CJPJ View Post
Never monitored the DPF temps, ..I do have the scangage II but never set it to exhaust temp.
Estimate it certainly would! Apparently around 450f oxidation starts, 572 as per graphic the rate becomes more efficient with the increased temperatures
Everything I've read indicates it takes a catalyst to get passive regeneration at those low temps.

https://www.ctscorp.com/products/sen...dpf-operation/

http://www.cumminshub.com/emissions.html

https://www.energy.gov/sites/prod/fi...chatterjee.pdf
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Old 05-27-2019, 02:31 AM   #10
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Default Re: Gurus ONLY Educate me about passive regenerations.

Quote:
Originally Posted by Boxster1971 View Post
Everything I've read indicates it takes a catalyst to get passive regeneration at those low temps.

https://www.ctscorp.com/products/sen...dpf-operation/

http://www.cumminshub.com/emissions.html

https://www.energy.gov/sites/prod/fi...chatterjee.pdf
How about This:

https://www.slideshare.net/mobile/Ka...aftertreatment
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