Cummins efficiently checks cylinder deactivation on X15 engine
The prospect of cylinder deactivation in diesel engines bought much more fascinating just lately as Cummins and propulsion software program firm Tula introduced a profitable demonstration of diesel Dynamic Skip Hearth (dDSF) in a Cummins Effectivity Collection X15 engine.
Silicon Valley-based Tula has seen its Dynamic Skip Hearth software program controls go to work in gasoline engines together with late mannequin Chevy Silverado and GMC Sierra pickups, which GM reported can enhance gasoline effectivity by as a lot as 15 %.
However diesel has been a tougher house for cylinder deactivation know-how the place fleets are excited about extra than simply gasoline financial savings. That’s the place Dynamic Skip Hearth, by way of its means to extend gasoline financial savings and decrease emissions in bigger diesel engines, can actually shine.
“The first goal has been to judge what we can deliver to future emissions laws,” mentioned Lisa Farrell, Cummins’ director of superior system integration. “The important thing benefit that this know-how brings is to enhance after-treatment temperature at low masses, which is without doubt one of the areas that diesel engines—as a result of they’re so environment friendly—they’ve very low exhaust temperatures and they also’re very challenged to keep up NOx conversion effectivity at low load and beneath low load operation.
“And in order that’s the place this know-how actually shines as a result of it improves the temperature, improves the aftertreatment NOx conversion and likewise concurrently offers you a gasoline economic system profit,” Farrell continued.
How Dynamic Skip Hearth works
Cummins and Tula started engaged on diesel cylinder deactivation in early 2019. Tula’s proprietary software program management algorithms play the function of all-important conductor by managing fastidiously measured and timed doses of gasoline and air mixtures together with controlling exact consumption and exhaust valve closings that may shut down unneeded cylinders to save lots of gasoline and enhance exhaust temperatures in low-load circumstances which in flip burn off extra NOx.
The know-how additionally achieves CO2 reductions by way of enhancements in combustion and reductions in pumping work.
“Demonstrating the aptitude to enhance gasoline effectivity whereas additionally reaching very efficient emissions management is extraordinarily necessary for all diesel engine functions sooner or later,” mentioned R. Scott Bailey, president and CEO of Tula Expertise. “Our partnership with Cummins has given us the chance to develop our DSF know-how past its success in gasoline engines.”
However software program could be nothing if not for the hardware that it relentlessly seeks to optimize.
“Now we have really been working with each Eaton and Jacobs Automobile Techniques as suppliers of the hardware that will mean you can deactivate the cylinders on an event-by-event foundation, which is without doubt one of the necessities to totally optimize with the Tula algorithm,” Farrell defined.
Growth to smaler engines a risk
Although centered on the X15 given its heavy-duty functions, Cummins has not dominated out utilizing the know-how in its different smaller oil burners.
“I don’t suppose we’ve made that call but,” Farrell mentioned. “However actually what we’re studying from testing on the ISX is that it is going to be relevant to our different engines. There’s nothing distinctive to that system.”
Up to now, testing on Cummins X15 has been relegated largely to the lab, however plans are within the works to place it to work on the street.
“Now we have a automobile that has the know-how. As quickly as we will get into the automobile to truly check it we’ll be placing miles on it,” Farrell mentioned.
On its web site, Tula posts diesel Dynamic Skip Hearth “simulations present 4 % reductions in gasoline consumption and CO2 whereas on the similar time realizing tailpipe NOx emissions reductions of as much as 11 %.”
As testing continues on the X15, efficiency figures relative to gasoline effectivity and emissions will probably be launched. Within the meantime, Farrell is feeling assured about Skip Hearth know-how.
“I feel it’s a really promising know-how and clearly Cummins and Tula are investing rather a lot on this growth program and we wouldn’t be doing that until we noticed a future for it,” she mentioned.
That future may also embrace predictive mapping.
“Now we have accomplished some research and a few DOE tasks that centered on autonomous drive, predictive routes and the affect and influence it may have on Dynamic Skip Hearth methods,” mentioned John Fuerst, Tula’s senior vp of engineering. “It was a gasoline-focused research however your hunch is correct on. There actually are vital advantages in case you can give it some thought simply in engine parameters prematurely and never simply reacting instantaneously however having a broader technique to make the most of the assorted parameters that you could alter. So I feel it’s an space for future research within the diesel enviornment a lot as we’ve accomplished to date on the gasoline aspect. Nevertheless it’s work to be accomplished sooner or later.”