DEF Operation Flashcards
The Cummins EPA 2013 ISX12 engine is provided with an Aftertreatment system that provides near ___.
zero emissions
Regeneration is the process of converting soot collected from in the aftertreatment DPF into ___.
carbon dioxide
Passive Regeneration Occurs when the exhaust temperatures are ____ enough to oxidize soot collected in the aftertreatment DPF faster than the soot is being collected.
naturally high
Passive regeneration typically occurs when the vehicle is driven at _____
high speeds (ie, highway speeds) and/or under heavy loads.
Active Regeneration — Required when the duty cycle does not generate enough heat to convert all the ____ being collected in the DPF.
carbon
The exhaust temperature during a normal active regeneration event could reach ____ and possibly ____ under certain conditions.
1100º F / 1500º F
DEF breaks down into ammonia (NH3) during a chemical reaction in the Decomposition Reactor through a process known as ____.
hydrolysis.
The NOx and ammonia (NH3) pass into the SCR element where a catalytic reaction takes place, converting the NOx into _____.
harmless nitrogen gas (N2) and water vapor (H2O
DEF is a solution of ___ automotive grade urea and ___ deionized water.
32.5% / 67.5%
DEF is ___ to handle and store. It is ___, NON-polluting and NON-flammable.
SAFE / NON-toxic
It will freeze at ____.
12 F (-11C).
DEF consumption will be approximately ___ of your fuel consumption.
2%
DEF has a shelf life of approximately ___ if stored in controlled temperatures between____.
two years / 10 and 90 deg F.
If stored outside of these temperatures it will last at least ___.
one year
Every vehicle with a U.S. Environmental Protection Agency (EPA) ___ or later engine has an on-frame storage tank for Diesel Exhaust Fluid (DEF) and a dash lamp that indicates low DEF levels.
2010
