Engine Exhaust After Treatment System Flashcards
Beginning in 2007, U.S Diesel engines were required to comply with more stringent emissions standards to reduce:
Soot (partially burned fuel)
Ash (partially burned oil)
Nitrogen oxide (NOx)
Emissions equipment and used by Cummins: ATD- DOC- DPF- SCR- DEF-
After treatment device Diesel oxidation catalyst Diesel particulate filter Selective catalyst reduction Diesel exhaust fluid
An exhaust canister, which replaced the typical muffler.
After treatment device (ATD)
ATD- An exhaust canister. Contains a _____ and _____.
Diesel oxidation catalyst (DOC) and Diesel particulate filter (DPF)
The DPF will trap _______, _____ and ____.
Particulate matter, soot and ash.
Soot accumulation in the DPF requires self cleaning through ____.
Regeneration
A catalytic converter that uses vaporized diesel exhaust fluid to reduce nitrogen oxide emissions.
Selective catalyst reduction
Diesel exhaust fluid (DEF) also known as: DEF, ____ ,or ___.
Urea or Ad-Blue
Diesel Exhaust Fluid = ____ % of urea and _____ water
32.5% urea and deionized water
DEF which breaks down into _____ (NH3) in a decomposition reactor through the process ______
Ammonia, hydrolysis
The NOx and ammonia pass into the ___ element where NOx is converted into harmless _____ and ______.
Selective catalyst reduction(SCR) Nitrogen gas (N2) and water vapor (h2o)
The high exhaust system temperature (hest) light indicates an active regeneration has been initiated and exhaust temps are elevated above normal levels. The HEST light will remain on until exhaust temperatures have dropped below _____
977 degrees F
525 degrees C
Diesel particulate filter lights (DPF)
On solid:
Flashing:
Flashing with amber check engine:
Flashing with red stop engine:
Solid- (low to medium levels of particulate build up. Vehicle requires regen but should be able to complete its mission before regen is performed.
Flashing-(medium to high levels of particulate build up). The vehicle requires a regen ASAP
Flashing with amber check engine: A DPF regen is required immediately.
Flashing with red stop engine:. as soon it is safe to do so, the vehicle should be stopped and remain shut down until serviced by Cummins dealer.
Passive regeneration
Initiate a DPF regeneration by switching to a more challenging duty cycle (such as highway driving for at least ___ min or pumping)
20 min
If the hest light is on and the vehicle speed has dropped below the threshold of ____ mph, the light will remain on until the vehicle speed increases ____mph back above the speed threshold and the regeneration process finishes.
5mph threshold
3mph above
Parked regeneration or stationary/manual regen. Trucks _____ rpm
900 rpm
Do not perform parked regen while connected to an _______.
If indoors, exhuast discharge pipe must be rates at ____ degrees F (___degrees C)
Exhaust extraction system
1500F (816C)
Performing parked regen, clear exhaust outlet area ____ft of any items, gasses, vapors.
5ft
Parked regen may take _____-___min. Or more depending on soot level.
20-40 min
Parked regen, exhaust temps stay high at least __-__min after completion.
3-5min
3 ways to cancel stationary regen before complete(emergency call)
- Depress the throttle
- Releasing parking brake
- Press the regen inhibit switch
After regen completion the hest light will remain illuminated until the exhaust outlet temp is below ___ degrees F or vehicle exceeds ___mph.
977F or 5mph
Maintenance,
_____ to _____miles or up to ___ hours
200,000-400,000 miles or 6,750 hours
Regen removes ___ from the dpf, but ____ remains in filter.
Soot
Ash
CEL will illuminate & fault code set when ___removal is required.
Ash
____ oil will maximize DPF maintenance interval
CES20081/ API CJ-4 oil
Def low light illuminate solid-
Def low light will flash-
Def low light flashing and amber check engine lit solid -
Def low ligh flashing , amber check engine lit solid, and mil light lit solid.
Def low ligh flashing , amber check engine lit solid, mil light lit solid, red stop engine lit solid
- 38-12%
- less than 12%
- less than 5% (1/4 gal. Remaining)
- def tank empty
- def tank empty and ignored, engine intentionally shut down or in extended idle.
Diesel exhaust fluid store at temperatures between ____ degrees F - ___ degrees F.
10F-90F
DEF, minimum shelf life of ____months
12
Def reservoir- ____ gal.
4.5gal.
Def will freeze around ____F (___C)
11F (-12C)
