The Cummins Diesel Engine AfterTreatment System

Cummins Diesel Engines have developed an after-treatment system that is very compact and easy to maintain. The only requirement is to have Diesel Exhaust Fluid available to add to the holding tank which is supplied by the Original Equipment Manufacturer.

Take a look at an over view of this system. Our fleet will be getting into these systems since we're running Cummins ISB and ISC Diesel Engines. Technology never stops growing, the age of smoky and sooty old exhaust pipes have come to an end.



Frequently Asked Questions - Cummins Aftertreatment System

1) What makes up the Cummins Aftertreatment System?

There are four major components: Selective Catalytic Reduction (SCR) Catalyst, Decomposition Reactor, DEF Dosing Valve, Cummins Particulate Filter.

2) What is DEF (Diesel Exhaust Fluid)?
DEF is a 32.5% strength urea water solution.

3) How much DEF will be required?
DEF consumption is expected to be approximately 2% of fuel consumption dependent on vehicle operation – duty cycle, geography, ratings, etc.

4) What size DEF tank is required on a vehicle?
The vehicle manufacturer/OEM will determine exact tank size and location on the vehicle. However, Cummins will be providing installation recommendations to the OEMs on tank size selections.

For example, in Europe, vehicle SCR tank sizes are typically 15 – 20 gallons.

5) What happens if the vehicle runs out of DEF?

Vehicles in 2010 that will use DEF will have two indicators on the dash that will alert the driver to quantity of DEF on board. One, there will be a new DEF gauge very similar to a fuel gauge today that will indicate level of DEF (i.e. full, half, quarter, etc.) Second, there will be a new DEF low level warning lamp that will illuminate when less than 10% of DEF is in the tank.

If the vehicle is operated such that one would run completely out of DEF the vehicle will not be shut down; however, power will be reduced enough to encourage the operator to refill the DEF tank. Once the tank has been refilled the engine will resume normal power levels.Mechanic Information to live by...