Regen

Could some of you experienced drivers explain what a "regen" is and how it's done? I've got a vague idea, but I never had to do one in my brief career. Maybe some of the other new drivers here would also benefit from a good explanation. And thanks for sharing your knowledge.

The short answer is soot builds up in the exhaust in the DPF ( Diesel Particulate Filter) when it reaches a certin point the truck "regens" to burn it out. Sometimes that means it adds fuel to the exhaust system to increase the temperature and burn out the soot.

If you do a lot of highway driving you should never need to do a "parked regen" as it will do it while on the road and you probably will not even notice. If you do a lot of local driving or the system is not working 100% you may have to do a parked regen. It usually takes aboit 40 minutes and the engine RPM adjusts as needed.

I'm certain in 6 months of driving your truck did regen Mr Bruce. Regen is what burns the DEF you would pump. Like Bob said super heats the soot, and why you rarely see thick black smoke from tail pipes like you used to see from stacks. The DEF system stores the soot then burns it.

The DPF system filter catches the excess soot that gets burned off during the Regeneration process.

I do highway driving and still have to do parked regents. Supposedly they fixed it back inMay, but it still does it

My very dirty instruction cards.

And you can’t just do it on your own, or I would do it once a week.

You have to have a malfunction, in my case the engine derated 25%

First time it happened I thought the engine shut off

Bruce, I dug up a classic archive for ya!

This thread has a video with a classic Professor type explaining what DEF does in a diesel engine. Enjoy! Watch the video. It's both informative and entertaining in it's own way. Hat tip to Errol for this one.

Professor Explaining How DEF Works In A Diesel Engine

Wondering if anyone has any experience with fuel source affecting regen. My trainer occasionally had to by fuel at a particular vendor (who shall remain namless)... (starts with a "P")... whenever he did one or more warning lights would come on shortly thereafter, regens would be long, noticeable and frequent. ANY other fuel you would barely notice it occured. International, manual tranny, average 200 mile days, mostly interstate.

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Regen is what burns the DEF you would pump.

This is not correct. DEF is introduced into the exhaust system continuously to decrease NOx emmissions. It has nothing to do with a Regen.

The DEF system stores the soot then burns it.

No. The DPF ( Diesel Particulate Filter ) stores the soot. Two completely different systems.