Terminating regen prematurely

[rickinAZ]

Like most of us (I hope) I monitor my active regens with a gauge (iDash in my case). For nearly four years I have been unwaiveringly diligent about letting them finish, even if it means circling the block instead of pulling in the garage when I get home. After all, they only last a smidge over ten minutes. Non-gauge owners do it all the time without knowing it. Is there any point to this? It's not like I'm going to let it get out of control with soot build up.

At the risk of offending my OCD tendencies, can I just adopt a somewhat laissez faire attitude without any repercussions?

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[Ratbert]

It was designed by Jeep to not require that extra gauge. Hopefully they didn't assume that all owners would think that the designers were wrong and the owners would go the extra mile like you've been doing.

 

[RockinRam96]

I have been wondering the same thing. I bought an iDash last summer, and see when the DPF filter reaches 100% and expect a regen soon. But have not figured out how to identify when it is in regen mode.

I have also been driving around at 100% for about a month and a half or so. With no regen. Unsure why. No engine lights on or anything like that.

 

[JLeco2022]

i've had 2 regens on my 22 eco, both times have showed on dash to not stop driving, i also have a banks i watch

 

[JLeco2022]

also while in regen you will notice your turbo temp rise, I had my first go off in LA traffic, i hit side streets and put it in manual shifting so i could keep constant rpm so the turbo could build temp, both times cleared in 5-10 mins of driving even on city streets if you get turbo temp over 600

 

[yarmo]

Like most of us (I hope) I monitor my active regens with a gauge (iDash in my case). For nearly four years I have been unwaiveringly diligent about letting them finish, even if it means circling the block instead of pulling in the garage when I get home. After all, they only last a smidge over ten minutes. Non-gauge owners do it all the time without knowing it. Is there any point to this? It's not like I'm going to let it get out of control with soot build up.

At the risk of offending my OCD tendencies, can I just adopt a somewhat laissez faire attitude without any repercussions?

Yes, you can; I've done it many times without issue. If you're above 80% full it will notify you to keep driving in order to regenerate (even without an idash or extra gauge). This is crossposted from the 1500 ecodiesel forum:

The ecodiesel is programmed to 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.​

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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).​

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

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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.​

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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.​

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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.​

 

[rickinAZ]

I have been wondering the same thing. I bought an iDash last summer, and see when the DPF filter reaches 100% and expect a regen soon. But have not figured out how to identify when it is in regen mode.

I have also been driving around at 100% for about a month and a half or so. With no regen. Unsure why. No engine lights on or anything like that.

There is an iDash metric for "regen on/off". Additionally, you can set it as an alert so it blinks yellow while the regen is on. Finally, you can set a metric for "exhaust gas temperature". When the temperature rises above 1,000° you are regening. On a hot day, under load, when not regening, the exhaust will max out at about 800°. There is no notification from Jeep itself. You need an iDash or Scangauge to see them. For me the (active) regens last exactly 11 minutes - every single time.

 

[john adams]

No need for a scanner or to monitor regens, unless perhaps all you do is drive super short distances. I drive plenty of long trips. No scanner because there’s no need. I understand some people just like to see more stuff but I’m not interested.

 

[rickinAZ]

No need for a scanner or to monitor regens, unless perhaps all you do is drive super short distances. I drive plenty of long trips. No scanner because there’s no need. I understand some people just like to see more stuff but I’m not interested.

Jeep would be have been better off dropping the tachometer, and adding diesel-specific gauges in that dashboard real estate. That would have ended the "I've driven 100K miles without a regen" comments we see on here.

In any case, who needs a tachometer on an automatic with a 4,500 rpm redline? Winding it beyond 3,000 rpms is counterproductive. Jeep: if you wanted to save money on gauges, be smart about it. And...yes, I know that my (tach) suggestion would have had nightmarish dashboard design issues. Just trying to make a point.

EDIT: tense changed to past

 

[Ratbert]

Jeep would be better off dropping the tachometer, and adding diesel-specific gauges in that dashboard real estate. That would end the "I've driven 100K miles without a regen" comments we see on here.

Who needs a tachometer on an automatic with a 4,500 rpm redline? Winding it beyond 3,000 rpms is counterproductive. Jeep: if you want to save money on gauges, be smart about it. And...yes, I know that my (tach) suggestion would have nightmarish assembly line issues. Just trying to make a point.

Wasted words. The diesel is history.

But yes, the dash for the diesel was already custom for the lower redline.

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