The Aftertreatment System
The BlueTec 1-Box Configuration, available only with Detroit engines, combines the SCR catalyst, the diesel oxidation catalyst (DOC), diesel particulate filter (DPF) and diesel exhaust fluid (DEF) into one simple component. Combining all of these systems lowers engine back-pressure, yielding better fuel economy. The system's job is to capture and burn off (regenerate) the particulate matter (soot) in the engine’s exhaust gas. It does this using a DOC and a DPF. By monitoring exhaust gas temperature and system back pressure, DDEC® control module determines when and how additional help is needed to ensure complete regeneration of the soot captured in the DPF.
When required, DDEC 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, assisting 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.
Depending on engine duty or application, DDEC may notify the driver that stationary regeneration is necessary. Once the driver begins the forced high-idle regeneration process, it typically finishes in 20-30 minutes.
Maintaining your Aftertreatment System is easy, because we designed it that way. The Diesel Particulate Filter (DPF) collects ash and will eventually need to be replaced, but the DDEC system will alert you when filter replacement is required, usually between 150,000 to 550,000 miles of operation.
Cleaning the Diesel Particulate Filter (DPF)
If the DPF needs more extensive service, use the Detroit Genuine Parts Replacement program. Your DPF will be replaced with our signature Detroit Genuine Parts brand, while the old core is sent back to our factory for an extensive proprietary, environmentally friendly washing service.
Aftertreatment Systems need diesel fuel with sulfur content below 15ppm. The higher sulfur content commonly found in fuel may eventually cause damage to your Aftertreatment System by fouling or prematurely plugging the Diesel Particulate Filter. Using the correct fuel is essential to the proper function of your Aftertreatment System, and also lowers emissions.