Aftertreatment Temperature Stabilization

[DVT873]

(10-03-2020 )Rawze Wrote:  Just an update... It is called the "Stay Warm" feature in the programming. it is part of the 'Soot Filter Reduction' manager and the 'Emissions auXiliary reduction Manager' systems in the ecm. It essentially will extend the regen cycle and keep it active at low speeds for up to 10 minutes (then it times out) if it is in a regen and you slow down.

I would imagine this would consume more fuel, dumping it into the exhaust to keep the system hot while it is in this state. Guess it would be a trade-off of possibly more complete regen cycle on trucks that stop/go a lot at the expense of some extra fuel ... for up to 10 minutes before cancelling the regen cycle. -- just speculation based on what I have seen of it behind the scenes in the ecm programming.

The "Stay Warm" has been helpful on school buses w/ 2350 ISB 6.7. Does Cummins have a Regen Inhibit option? The medium NAV MF engines I work with can have that option enabled. Very helpful in stop and go operations, in city, landscape dumps, short haul etc. Works well IF the drivers are not idiots. Big IF. Stops the engine from doing active regen on it's own. Used by a non idiot the truck is operated until the 1st stage DPF warning comes on. Operation can continue for a while.
Then when the truck can be out of service for 30 to 50 minutes a parked regen can be run. This strategy lets a complete regen run. This works well depending on the driver. What was happening before was the ECM commanded regens usually never got to complete. Truck would be stopped, or go under 7mph all of which stop the regen. Since the DPF didn't get fully "emptied" they would regen a lot. Since many of these use in cylinder dosing that would lead to fuel dilution and other problems.. Have not seen this option in INSITE on the ones I have looked at.

BTW may have a good "EGR tuneup" success story in a few days. Waiting on results.