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Discussion Starter #1 (Edited)
Regeneration of the Diesel Particulate Filter (DPF)

Here's some basic information concerning the self cleaning (regeneration) of the Diesel Particulate Filter:

Active = fuel is injected into the exhaust stroke strictly for the purpose of increasing exhaust gas temperatures (EGT's) in order to get to the temperature necessary to burn the soot out of the diesel particulate filter (DPF).

Your truck will regenerate (active) when the DPF soot level reaches 65%. This will likely occur every 100-300 miles. You will only see the notice on the EVIC if the soot level reaches 80-90% due to uncompleted regens.

Active self-regeneration occurs when there is not sufficient heat in the exhaust to convert all the carbon being collected in the DPF. Exhaust temperatures are raised by injecting a small amount of fuel upstream of the Diesel Particulate Filter.
The resulting chemical reaction over the DOC raises exhaust gas temperatures high enough to oxidize the carbon from the filter. This is all done without any operator intervention.

Passive = the engine is working hard enough under its own power that the EGT's are hot enough to keep the regeneration of the DPF in process, there is no extra fuel burned as it is not necessary.

Based on my observations, you will not see EGT’s hot enough for passive regeneration at unloaded highway speeds. The EGT’s are actually quite low when cruising on the highway unless you are towing a heavy load,are carrying a full payload, or driving hard.

From forum member Patty:

The truck's programming will make many repeated attempts to regenerate the DPF, from a high soot mass level of 65% down to <10% when a cycle is complete. If your trip is too short and the engine is then shut off, or the truck is put in park with the engine idling, an active regeneration process stops (at whatever soot level the DPF is at). The next drive cycle when the DPF again reaches 65% soot mass the whole process starts all over again. If you are going on a road trip the complete cycle will happen many times over...up to 65%...regen...down to <10%...over and over again.

The following information from the Owners Manual:

EVIC Messages

Your vehicle has the ability to alert you to additional
maintenance required on your vehicle or engine. Refer to
the following messages that may be displayed on your
Electronic Vehicle Information Center (EVIC):

• Exhaust Filter XX% Full Safely Drive at Highway
Speeds to Remedy
— This message will be displayed
on the Electronic Vehicle Information Center (EVIC) if
the exhaust particulate filter reaches 80% of its maximum
storage capacity. Under conditions of exclusive
short duration and low speed driving cycles, your
diesel engine and exhaust after-treatment system may
never reach the conditions required to cleanse the filter
to remove the trapped PM. If this occurs, the “Exhaust
Filter XX% Full Safely Drive at Highway Speeds to
Remedy” message will be displayed in the EVIC. If
this message is displayed, you will hear one chime to
assist in alerting you of this condition. By simply
driving your vehicle at highway speeds for up to 20
minutes, you can remedy the condition in the particulate
filter system and allow your diesel engine and
exhaust after-treatment system to cleanse the filter to
remove the trapped PM and restore the system to
normal operating condition.

• Exhaust System — Regeneration In Process Exhaust
Filter XX% Full
— This message indicates that the
Diesel Particulate Filter (DPF) is self-cleaning. Maintain
your current driving condition until regeneration
is completed.

• Exhaust System — Regeneration Completed — This
message indicates that the Diesel Particulate Filter
(DPF) self-cleaning is completed. If this message is
displayed, you will hear one chime to assist in alerting
you of this condition.

• Exhaust Service Required — See Dealer Now — This
messages indicates regeneration has been disabled due
to a system malfunction. At this point the engine
Powertrain Control Module (PCM) will register a fault
code, the instrument panel will display a MIL light.

• Exhaust Filter Full — Power Reduced See Dealer —
This message indicates the PCM has derated the
engine to limit the likelihood of permanent damage to
the after-treatment system. If this condition is not
corrected and a dealer service is not performed, extensive
exhaust after-treatment damage can occur. To
correct this condition it will be necessary to have your
vehicle serviced by your local authorized dealer.

CAUTION!

See your authorized dealer, as damage to the exhaust
system could occur soon with continued operation.

Soot Loading Strategy (Quoted from Forum Sponsor GDE)

The ECU runs two different strategies in parallel and takes the higher of the two outputs to determine the current soot loading:

Strategy 1 is a simulated value, and is calculated according to how complete the previous regeneration was, and how the engine/vehicle has been operating since then (engine speed, load, ambient conditions, exhaust temps, etc). Different OEMs design different variations of such a strategy, but for the most part the high level concepts are similar. The strategy employed by the Ram's stock tune is fairly rudimentary.

Strategy 2 is a physically measured value calculated off of measured pressure drop across the DPF, the DPF temperature, and the known flow rate of exhaust gasses.

The soot loading is used to trigger the regeneration when all the correct criteria are met.

Just as a note for some more info...

Passive regens happen when there is sufficient exhaust temperature and a favorable NO2/NOx ratio for the soot to burn. This phenomena will happen starting with exhaust temps in the 380-400°C range.
However...the stock tunes are not capable to detect that passive regeneration is taking place, and to thus slow the modeled accumulation of soot and/or decrease it if the burn rate exceeds the production rate. This is why the intervals are not improved more in the highway cycles.

...we fixed this with our tunes, in order to avoid regenerating when it's not necessary.
 

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Driving around town, I do about 90 KM and on the highway, around 200 to 300 km. When towing, I go over 300 KM. I also noticed that having my winter covers seems to slow down the Soot build up. I have the EDGE CS2 and monitor all the EGT's etc.
 

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keeping the engine hot helps with the dpf , I am thinking thats why most diesels have a High id-ail, and have to drive at highways speed " higher RMP's " to clean filter
 

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I have just turned 35,000 miles and have never seen anything in my EVIC about the dpf or soot level. However, the majority of my trips are 30-35 miles one way at 50-60 mph. I also note some of the owners manual stuff in the OP reference Cummins so wonder if some of it came form the 2500 section not the 1500 section.
 

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97hmcs:
As you know I have posted on this regeneration subject numerous times as it is an annoying problem on my 2014. You have posted the above explanation several times which is appreciated.
I have a related question that maybe you can answer? I also own a 2013 Mercedes Benz GL350 which has the MB 3.0 L diesel engine. It now has about 56,000 km and I have never had any indication of a regeneration. Perhaps the EVIC is just not as informative? This vehicle does more short trip city driving than my Ram. My question is, does MB just have a better system than the Ram? If so, what's the difference?
 

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Discussion Starter #7
I have just turned 35,000 miles and have never seen anything in my EVIC about the dpf or soot level. However, the majority of my trips are 30-35 miles one way at 50-60 mph. I also note some of the owners manual stuff in the OP reference Cummins so wonder if some of it came form the 2500 section not the 1500 section.
Good Catch, Howie. I certainly did scoop-up some information from the Cummins section of the owners manual. I will revise my post accordingly. Perhaps I should proof read before I post. :eek:

I appreciate your help, :)

Joe
 

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Discussion Starter #8
97hmcs:
As you know I have posted on this regeneration subject numerous times as it is an annoying problem on my 2014. You have posted the above explanation several times which is appreciated.
I have a related question that maybe you can answer? I also own a 2013 Mercedes Benz GL350 which has the MB 3.0 L diesel engine. It now has about 56,000 km and I have never had any indication of a regeneration. Perhaps the EVIC is just not as informative? This vehicle does more short trip city driving than my Ram. My question is, does MB just have a better system than the Ram? If so, what's the difference?
Ron, I'm not familiar with the MB. I hope you get your regeneration issues sorted out.
 

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I currently have 18,000 miles on my 2015 ECO and I have never seen anything in my EVIC either. I am almost always driving highway speeds of 65 -70 mph with trips ranging from 50 - 250 miles. I am assuming this is good?
 

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I currently have 18,000 miles on my 2015 ECO and I have never seen anything in my EVIC either. I am almost always driving highway speeds of 65 -70 mph with trips ranging from 50 - 250 miles. I am assuming this is good?
Yes this is good and normal, if you want to know when it is happening get a OBDII gauge


Sent from my iPhone using Tapatalk
 

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I installed the GDE tune at 1200 miles. My truck regenerated the other day for the first time since then at 1900 miles. So 700 miles between regens ain't too bad I'm thinking
 

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I installed the GDE tune at 1200 miles. My truck regenerated the other day for the first time since then at 1900 miles. So 700 miles between regens ain't too bad I'm thinking
I went about 725mi before my first Regen on my '16 with the GDE tune. so similar results. Just hit 1200 miles so we'll see if that continues.
 

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My truck did a regen at 700 miles or so, and by 1,200 the filter was full and it went into limp mode so I limped it to the dealer. They did a software update and a regen. Since then if I do all town driving, which involves a lot of shorter trips up to 5 or 10 miles at the most, and many only 1 or 2 miles, it will regen every 50 to 75 miles. Incredibly frustrating. If I had known that this truck cannot operate strictly as a city truck, I would never have bought it.

The biggest annoyance is that I will start the truck, with no prior warnings the info screen will say "filter 70% full, drive at highway speed to remedy" and then within a minute or two it's at 90%, and I'm forced to drive 8 miles out and back into town for it to regenerate. Not exactly convenient. The dealer says this is normal with the ecodiesels. It's the only thing that I dislike about the truck. The time it went limp I had less than 2 miles from initial warning to limp mode.
 

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My truck did a regen at 700 miles or so, and by 1,200 the filter was full and it went into limp mode so I limped it to the dealer. They did a software update and a regen. Since then if I do all town driving, which involves a lot of shorter trips up to 5 or 10 miles at the most, and many only 1 or 2 miles, it will regen every 50 to 75 miles. Incredibly frustrating. If I had known that this truck cannot operate strictly as a city truck, I would never have bought it.

The biggest annoyance is that I will start the truck, with no prior warnings the info screen will say "filter 70% full, drive at highway speed to remedy" and then within a minute or two it's at 90%, and I'm forced to drive 8 miles out and back into town for it to regenerate. Not exactly convenient. The dealer says this is normal with the ecodiesels. It's the only thing that I dislike about the truck. The time it went limp I had less than 2 miles from initial warning to limp mode.
I am inclined to think that your truck has a problem. My trips are 80% city driving with round trips of around 6-10 miles. I see regens at around 60-90 miles, but have never had the EVIC message to drive at freeway speed.
 

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My truck did a regen at 700 miles or so, and by 1,200 the filter was full and it went into limp mode so I limped it to the dealer. They did a software update and a regen. Since then if I do all town driving, which involves a lot of shorter trips up to 5 or 10 miles at the most, and many only 1 or 2 miles, it will regen every 50 to 75 miles. Incredibly frustrating. If I had known that this truck cannot operate strictly as a city truck, I would never have bought it.

The biggest annoyance is that I will start the truck, with no prior warnings the info screen will say "filter 70% full, drive at highway speed to remedy" and then within a minute or two it's at 90%, and I'm forced to drive 8 miles out and back into town for it to regenerate. Not exactly convenient. The dealer says this is normal with the ecodiesels. It's the only thing that I dislike about the truck. The time it went limp I had less than 2 miles from initial warning to limp mode.
Sounds like the regens aren't completing properly for what ever reason. Likely because on the 1-2 mile trips the truck doesn't even get up to operating temperature, and the truck won't even start to try and get to temps that are required to do a regen, until it's up to or close to operating temps.

You may want to look into the GDE tune... it will increase the distance between regens substantially, even with mostly city driving. You can look in the tuning or GDE section for more info.
 

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I am inclined to think that your truck has a problem. My trips are 80% city driving with round trips of around 6-10 miles. I see regens at around 60-90 miles, but have never had the EVIC message to drive at freeway speed.
I concur. I drive primarily City - 14.7 KM one way to work, 50% city road, and 50% highway. I have only had an Active Regen (on the EVIC display 90% message) twice - and am at 55000KM. I am pretty sure it has done some Active Regens without telling me, as I can tell by the smell when I stop driving. (I don't have any gauges to monitor - which might be a good thing).

The Active ones I was warned about, were done in about 10 minutes - the last one I actually tried to get to the highway - but it finished before I got there.
 

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The truck hasn't been doing it as much recently, maybe because the weather is warmer and it's getting up to temp more quickly. I think the super short trips have a lot to do with the timing of the regens, but the note to drive at highway speed to do the regen drives me nuts. I find it interesting that others don't get this message.

I've looked at the GDE tune. $800 is a lot of money but it's worth looking at, thanks for the info.
 

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lookaught:
I know exactly how you feel. For my opinion and further information you can check out the thread I started "excessive REGENERATIONS". in the mechanical section. Where are you located (province / state)?

I have considered trading for a hemi but instead of loosing money going that way I am now also thinking about the GDE tune. I too like the truck in every way except for the frustrating, annoying frequency of the regenerations. I too wouldn't have bought the ED if I had known they would occur this frequently.
 

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one other option is to get a monitoring gauge , like the Edge CS2 or CTS2
this way you see on the screen all the time the " soot % "of the filter ,
and you will know if a regen is coming soon , also the forced regen makes it possible
for you,"" prior to starting the truck"" , to ask the truck to start a regen as soon as the
engine will reach the necessary temperature , even if you haven't reached 66% soot
in the filter .
.
when I know I'm going for a 15 minute drive , and I last turned off the engine at around
60% in the filter (DPF), my return trip would get me at around the critical 66% , on arriving at
my final destination of the day , meaning I would want to get out of the truck , but the truck
wants to start a regen , I am not going to go for an extra ride of 10-15 minutes .
that is when I ask the truck to start a regen , when I get back home I am at +/- 10% if
I ask for the forced regen .
.
And if you don't ask for a forced regen , and your regen actually starts on your way back home
the regen does not complete itself , you turn engine off , when you restart the engine the next time,
you can see the new " %" of soot on the display and go from there .
 

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I have 18,600 miles on my 2015 Ecodiesel and just noticed the EVIC message that told me my filter was at 100% and a regen was taking place. I was driving home from work and noticed that as I pulled into the driveway the percentage was dropping, from 100 to 60%, by the time I got my owners' manual out and looked up the regen explanation it was done.........
 
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