Regen

[CAPN Harley]

Do these models specifically the 2014 model perform a regen and how can you tell when regen occurs

 

[14ram]

Yes certainly they do,

I have not caught all of them but I sometimes catch it in action

- the engine sound is deeper more of a growly sound immediately after exiting the interstate
- the def injector tick is very fast heard from drivers side of truck standing outside engine running
- heat coming out of tailpipe is too hot to hold your hand near it for long
- engine seems more responsive less throttle lag

i read somewhere another owner reported regens about every 800 miles but I am sure that would depend greatly on driving habits.
Edit:- was using a cts2 which indicates regen in progress

 

[CAPN Harley]

Thx just wondering everyonce in awhile i smell something and am wondering if that comes from it.

 

[jacknife]

It will smell a little bit as it is burning soot.

 

[Newsa]

Yes certainly they do,

I have not caught all of them but I sometimes catch it in action

- the engine sound is deeper more of a growly sound immediately after exiting the interstate
- the def injector tick is very fast heard from drivers side of truck standing outside engine running
- heat coming out of tailpipe is too hot to hold your hand near it for long
- engine seems more responsive less throttle lag

i read somewhere another owner reported regens about every 800 miles but I am sure that would depend greatly on driving habits.
Edit:- was using a cts2 which indicates regen in progress

Had an active regen happen today. So I took some mental notes and scrolled through the 3 inch evic to see what happens.

I got back from a 2000 mile trip a week ago and only drove it about 20 miles this week. Apparently the DPF/EGT's didn't get hot enough to do a passive regen on the 2000 mile trip. I wasn't pulling anything but drove a lot of hwy miles. I guess since I was unloaded, there wasn't much passive regen action happening.

I have the G56 and there might be a different programming for the regens with the manual transmission.

I agree with the quote above that the engine seems to growl more and the throttle seems a bit more responsive.

Interesting observation at a stoplight. It goes into regen when I take my foot off the brake and stops regen when putting foot back on the brake (no movement in either scenario.... Stopped at a stoplight) I checked this repeatedly. Foot on brake, it stops regen. Foot off brake it starts regen. Did this about 15 times, and every time it replicated the on/off result.

Also, the regen seems to stop above 20-25 mph. I couldn't catch the exact mph where it seems to stop. I can get it to regen in first, second, and third easily..... if it needs to regen. It will regen a bit in 4th, but that is when the speed is getting fast enough to halt the regen. A bit of regen when idling in 4th, but when speeding up past the 20-something mph speed, it stops regen.

I previously thought that the exhaust brake was being engaged as more fuel is squirted into the cylinder. The truck sounds like the exhaust brake is engaged while the truck runs a bit louder. There is the hiss of the Turbo as the regen occurs. My rationale has been previously that the exhaust brake works against the engine to provide a load allowing EGT's to climb. But apparently, today, I discovered, the hiss is from turbo boost, not the exhaust brake.

Scrolling through the EVIC, I get 0 HP on the exhaust brake. But some interesting things happen to the Turbo boost. As long as I'm not going too fast for an active regen, the turbo boost goes from 1 psi boost to 10 psi boost as I increase from 1200 rpm's to 2000 rpms. And this all happens with barely any pressure on the accelerator.

So it seems that the hiss that I hear during regen about the growling engine is actually the turbo boost. Normally, I have to have the truck under load and depress the accelerator significantly to get 10 psi of boost. But with an active regen taking place, it takes a very light throttle to increase the turbo boost as long as the truck is going relatively slowly.

I haven't heard the DEF injector or DEF pump making any noise during an active Regen. Not saying it doesn't....... Just haven't heard that, and don't know why it would need more DEF during a regen.

 

[schmeg]

The truck will regen regardless of vehicle speed or load. Passive regen is a simple term for (hot enough EGT at the DPF to burn off some of the soot that is accumulating). You will hit an active regen when the DPF hits a percentage of total volume. It will stay in regen as long as you stay moving. You can stop for short periods and keep the regen going. It will stay in regen regardless of gear or speed or load. It will regen with more efficiency at highway speeds. The EGT will stay above 1000F which will complete the cycle in about 10 minutes. If you decrease speed and or load, the EGT's will drop to 900 or so and will take longer for the regen to complete. I have a Scanguage II that I brought over from my Ecodiesel that allows me to see this all happen real time. The only problem I'm having is being able to read the STM (Soot) level in the DPF. I need to call linear Logic to see if they have a fix for it. The STM field must have been set up for the ED. Some people say to"just drive the truck and don't worry about what is going on". when I see a regen in progress, I don't shut down until its done. Then I drive a bit to cool things down. This is more the case if I'm using the truck for commuting. Over the road hauling its a non issue. The exhaust does get smoking hot.

 

[CHill]

I've just purchased a 2013 to "supplement" my 2001 so I am new to the regen thing. So will there be a message come up in the instrument cluster display when a regen is in progress?

 

[Newsa]

I've just purchased a 2013 to "supplement" my 2001 so I am new to the regen thing. So will there be a message come up in the instrument cluster display when a regen is in progress?

If they had all the RRT's and software updates, there will be no EVIC or dash message. When i first got my 2013, I received dash/EVIC messages. The message would display a percent of how full the DPF (filter) was and it would count down from 90% to 0. But after the software updates, the truck doesn't display regen messages. The first few times, it counted down pretty quick. Then after a few months the count down seemed to take forever. I think they removed the message because you couldn't see anything on your evic and it would be a real inconvenience.

 

[shorthorn]

I honestly don't notice any of these "tell tale" signs with my '14 3500 Tradesman. Had it not been for the EDGE CTS display telling me Regen was active, I would never notice.

 

[schmeg]

The only time the truck will display a panel annunciation is when the DPF reaches 80 percent capacity and directs you to drive. The ECU commands a regen much earlier that 80 percent on a normal basis and you won't know it unless you have a way to monitor EGT's in which you will see a big spike. As long as you drive long enough to burn off some off the soot in the DPF and keep the threshold below 80 percent, you will never know the difference. Once I see a regen start, I drive until its complete. Its hardly ever an issue.

 

[Too Tall]

Unless you have some kind of monitor connected to the ODBC connector, it's going to be very difficult to tell when the truck is regenerating. I wouldn't know it if I didn't have the Insight CTS monitor. As mentioned the truck will regen at any speed including neutral but stops immediately when placed in Park. If the truck is shut down during regen, or placed in park, it will go right back into regen (regardless of EGT) on startup and eventually finish. Running the highway empty or towing, my truck doesn't do active regens. Local stuff, it has active regens often. I've read where the DPF burns soot above 500 deg F. I suspect that's pretty close from what I've seen. Local driving, my DPF temp mostly stays in the 400's. Highway, above 600. Towing, I've seen 1000 but usually 750 to 850.

The bottom line however, don't worry about regens. The truck will take care of itself. Avoid short trips that don't allow the engine to operate at full temp. however, sometimes we can't control that.

 

[Newsa]

As mentioned the truck will regen at any speed including neutral but stops immediately when placed in Park. If the truck is shut down during regen, or placed in park, it will go right back into

Nobody said they were worried about regens. I don't even worry about whether i shut it down or keep it running during a regen. I believe it doesn't necessarily wait until the DPF is dangerouslh full to actively regen, so no need to worry.

Discussion doesn't always indicate worry. Maybe just owners/enthusiasts interested in knowing.


But, the regen programming is different for a manual transmission truck. I never put it in "park". But i did notice at a stoplight that it stops regen with the foot on the brake and starts again with foot off the brake. The regen programmimg is likely also a function of how full the DPF is. The more full the DPF, the more likely it is not to be worried about the speed you are going when it initiates an active regen. I hear it consistently stop active regen at 20 mph..... probably because the DPF doesn't urgently need a regen.

As for knowing when it's regenerating the DPF, my wife always asks "why is the truck making all that extra noise?" When it's regenerating. So i know it's not just me. She gets irritated by the noise because she thinks the neighbors and passerbys hear it.

 

[kthaxton]

Yet I have never "heard" a regen.

 

[gsbrockman]

Yet I have never "heard" a regen.

.....nor have I. I guess my 53.5 avg MPH means most all (if not ALL) of my regens are passive in nature.

One of Too Tall's best posts ever :

The bottom line however, don't worry about regens. The truck will take care of itself. Avoid short trips that don't allow the engine to operate at full temp. however, sometimes we can't control that.

 

[Newsa]

.....nor have I. I guess my 53.5 avg MPH means most all (if not ALL) of my regens are passive in nature.

One of Too Tall's best posts ever :

Ironically, we were literally returning to the house with "groceries"..... When my wife noticed it. :-laf


But we both agree that the truck is the most comfortable vehicle we own, so we use it for everything.

I probably could have gotten by with a gasser. But now that i have it, I really love the Cummins and the fuel mileage.

 

[Too Tall]

Nobody said they were worried about regens. I don't even worry about whether i shut it down or keep it running during a regen. I believe it doesn't necessarily wait until the DPF is dangerouslh full to actively regen, so no need to worry.

Discussion doesn't always indicate worry. Maybe just owners/enthusiasts interested in knowing.


But, the regen programming is different for a manual transmission truck. I never put it in "park". But i did notice at a stoplight that it stops regen with the foot on the brake and starts again with foot off the brake. The regen programmimg is likely also a function of how full the DPF is. The more full the DPF, the more likely it is not to be worried about the speed you are going when it initiates an active regen. I hear it consistently stop active regen at 20 mph..... probably because the DPF doesn't urgently need a regen.

As for knowing when it's regenerating the DPF, my wife always asks "why is the truck making all that extra noise?" When it's regenerating. So i know it's not just me. She gets irritated by the noise because she thinks the neighbors and passerbys hear it.

Yes, I'm sure it's different for manual transmission, being that it doesn't have a Park. My truck will start active regeneration at any speed, including cold idle. If it was shut down during an active regeneration, it will resume as soon as I crank it up and take it out of Park. That's my experience with my truck which is a 2014 68 RFE. Active regeneration is triggered by DPF differential pressure. I like to monitor EGT1 EGT3 and DPF differential pressure. I can usually expect an active regeneration somewhere between .05 and .07 idling psi (delta). When running highway, the soot runs right through the DPF and my idle DPF PSI is usually 0. Local, it'll usually do them every 75 miles or so.

 

[Too Tall]

Yet I have never "heard" a regen.

It just the method of taking big visible particles of soot and turning them into little invisible particles of soot.

 

[jhenderson]

It just the method of taking big visible particles of soot and turning them into little invisible particles of soot.

He meant he hasn't noticed a change in the sound of the truck during regeneration.

 

[Too Tall]

He meant he hasn't noticed a change in the sound of the truck during regeneration.

Oh, Oh yea, sorry. Misread that. I've never hear it either or smell it or seen reduced fuel mileage during regen. If I didn't have the regen indicator, I'd never know it.

 

[kthaxton]

He meant he hasn't noticed a change in the sound of the truck during regeneration.

Correct, I know what a regen is, the only indication I have ever had was the smell....and it's been a while since I've noticed that.