Diesel Particulate Filter Diagnostics Using Correlation and Spectral Analysis

[OggyOggy]

I've been doing alot of hunting for information on how to determine the health of my 2012 6.7 DPF and ran across this. Just thought some of you might find it interesting, I did.

https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1026&context=ecetheses

 

[762vram2043]

Looks interesting, thanks for sharing. May take a while to digest it.

 

[762vram2043]

Looks interesting, thanks for sharing. May take a while to digest it.

 

[6V92TA]

that report will make your head swim. basically your DPF should be able to clean itself from soot but at some point in its life it will become contaminated with Ash from the motor oil and it will have to be replaced. its a shame they don't offer the rebuildable cleanable DPF's on these trucks like they use on more heavy duty vehicles

 

[Wayne M.]

Excellent Thesis. I made it through 1/3 before time ran out, but I will finish it. Without full authority diagnostics and data logging, its tough to really rate a DPF or even a SCR system. Watching the temps and differential pressures tell the tale, as well as simply watching for soot at the tailpipe.
For the Ford camp, Bully Dog has come out with a real deal drop out and serviceable DPF for their 6.7's. Aftermarket has flooded the heavy duty DPF market. There's no reason there shouldn't be one for Ram.

 

[OggyOggy]

Too bad that Bully Dog DPF can't be used on the RAM.

 

[Bob4x4]

There are plenty of places rebuilding dpfs,one issue is the restriction through it must be the same as the oem for all the system calibrations to function correctly.It sounds simple enough but in the real world the tech has a limited amount of diagnostic tools- not a lab

 

[Barbieri]

Thank you for the article. Does aftermarket fuel additives decrease or increase efficiency of traps?

 

[m37]

The report is 10 years old, do you think the technology might have changed?

 

[Busa Dave]

Old Report--of questionable use. Good for some general information though.

 

[Wayne M.]

DPF diagnostics and monitoring hasn't changed much, whereas SCR diag and monitoring has, especially in regards to nox reporting.
The report is valuable to anyone looking to learn about diesel emission technology.

 

[Barbieri]

It is my understanding that they don't use it in the current trucks. I don't use def in my 2012. I would call it old or outdated technology. The problem as I understand was the traps and other parts would become full of soot. If you allowed the truck to idle for extended periods then you was likely to cause problem. Driving under 40 mph had the same effect. City driving was a no, no.

 

[762vram2043]

Discussion here got me curious about the dynamics of the combustion process in diesel engines and the variables related to soot formation. It has been my conception that soot formation is higher at higher engine loads but I'm wondering if this is a misconception. My conception is based on observation (before soot emission control requirements) of increased soot emission from stacks of semis when accelerating a load. For those interested I found a 100+ slide show on this subject. It is at https://www.slideshare.net/ferozepuria/combustion-in-diesel-engine and was published in late 2012.