NOX adsorber regeneration every 15 minutes

[Dale_K]

I googled "NOX adsorber" and found some info on the 6.7. Maybe old news to some. Link below...

Issue 56 - 6.7 HP CR - 6.7 HPCR Engine Meets 2010 Emissions

Relevant paragraphs...

"All three aftertreatment sections have their own active regeneration schedules, and the engine ECM controls the regeneration cycles. Even more significant, despite the use of fuel for regeneration, the overall fuel economy for the vehicle is virtually unchanged from the 2006 trucks, Cummins said.

"The NOx adsorber is regenerated every few minutes at approximately 600° to 800°F and the process takes about three to five seconds. The NOx adsorber will also, over time, absorb sulfur from the fuel, which can reduce its effectiveness over time. So depending on how much fuel is burned—typically every two tankfuls, a separate regeneration cycle is initiated to remove the sulfur. The PM filter is regenerated when mass flow sensors in the exhaust system detect a specified amount of loading on the substrate, typically about every four operating hours. Unlike the PM filter systems used on heavy-duty applications, there is no ash cleaning required, and the PM filter—like the NOx adsorber and close-coupled catalyst—is rated for the life of the vehicle.

[Compcowboy]

Good find man.

[slagburn]

Interesting read, should be mandatory for anyone with the 6.7L.

the overall fuel economy for the vehicle is virtually unchanged from the 2006 trucks, Cummins said.

"Cummins engineered the entire aftertreatment system down to specifying the washcoat on the catalyst bricks, and the system was assembled by Tenneco, which does aftertreatment system packaging for many segments of DaimlerChrysler."

And then Dodge stuck a BlueTec badge on the back of the truckwhich is a MB thing or maybe it is just a clean diesel thing but I have seen it on the back of one little MB SUV.

In another departure from the heavy-duty side, all of the hydrocarbon dosing (diesel fuel) needed to raise the temperature for the various aftertreatment regenerations is handled by the fuel injection system rather than a separate injection system.

Would like hear their comments now regarding fuel in oil that some of us have been experiencing.

Some interesting comments at the bottom of that article.

[Flattman]

this was the best by far course of action to make the best truck for customers and the cleanest truck you can find anywhere in America.

I would like to know what some of the other options were.

Hey America, if you're listening, I'm doing my part. My truck is putting out ZERO emissions right now because it's sitting in one of the dealer's bays with 2 more codes and a clogged turbo...

[LSmith]

Interesting that BlueTec (designer of the original version) says that using fuel for regen in a heavy vehicle hurts fuel mileage but Chrysler says it doesn't. I say BlueTec was right....

[Cummins 67]

Cummins Does Not have anything to do with our after treatment systems.

They where designed by Chrylser.

Only the Big Rigs was the after treatment
Was designed by Cummins.

Also ECM is Chrysler not Cummins design.