Exhaust Aftertreatment System
Lower Emissions
EPA 2007 guidelines required a significant reduction in diesel exhaust emissions. This positive change for the environment created a challenge for everyone, but Detroit Diesel took the challenge head on.
The Aftertreatment System
The Detroit Diesel Aftertreatment System contains several interacting components that function as an integrated system — all controlled by the proven power of the Detroit Diesel Electronic Control (DDEC).
The system's job is to capture and burn off (regenerate) the particulate matter (soot) in the engine exhaust gas — it does this using a Diesel Oxidation Catalyst (DOC) and a Diesel Particulate Filter (DPF). By monitoring exhaust gas temperature and system back pressure, DDEC® VI determines when and how additional help is needed to ensure complete regeneration of the soot captured in the DPF.
Here you can learn about the three new lights and a new switch that manage your DPF filter on all post-2008 Detroit Diesel engines.
Active Regeneration
When required, DDEC® VI gets help from two key upstream components that assist in a process called active regeneration.
- The Intake Throttle is electronically actuated to help increase the Aftertreatment System temperature — helping regeneration.
- The Dosing Valve injects a mist of diesel fuel into the exhaust system to further increase the Aftertreatment System temperature until satisfactory regeneration is complete.
This process of active regeneration takes about 20 minutes and happens during the normal operation cycle of the vehicle. No manual performance or control changes are necessary.
Stationary Regeneration
Depending on engine duty or application, DDEC® VI may notify the driver that stationary regeneration is necessary. After the driver begins the forced high idle regeneration process, it typically finishes in 20-30 minutes.
Maintenance
Maintaining your Aftertreatment System is easy — we designed it to be. The Diesel Particulate Filter (DPF) collects ash and eventually needs to be replaced. The DDEC system carefully will alert the driver when DPF replacement is required, ranging from 150,000 to 550,000 miles of operation.
Cleaning the Diesel Particulate Filter (DPF)
The DPF is easily removed by your dealer from the Aftertreatment Device, cleaned and replaced. The entire service process only takes about 45 minutes.
If the DPF needs more extensive service, use the reliabilt® Remanufactured Exchange program. Your DPF will be replaced with our signature reliabilt® brand, while the old core is sent back to our factory for a proprietary, environmentally friendly extensive washing service.
ULSD
Aftertreatment Systems need diesel fuel with Sulfur content below 15ppm. The higher Sulfur content in today's fuel may eventually cause damage to your Aftertreatment System by fouling or prematurely plugging the Diesel Particulate Filter. Using the proper fuel is not only important to ensuring your Aftertreatment System functions properly, but also to lowering emissions.
CJ-4
Using the proper engine oil is also important to ensuring your engine and Aftertreatment System achieves the best maintenance intervals. Today's current CI-4 engine oil contains a sulfated ash level of 2.0 wt %. In 2007 oil manufactures will produce a new oil formulation (CJ-4) with 1.0 wt % sulfated ash to help extend the maintenance cycles for the Diesel Particulate Filter.
