2.1.1 Aftertreatment Variances
2.1.1.1 1-BOX™ Aftertreatment System
2.1.1.2 2-BOX (2V2) Aftertreatment System
2.1.2 Description and Operation of the Diesel Particulate Filter
The Diesel Particulate Filter (DPF) substrate is comprised of a ceramic material. The substrate consists of
channels that run the full length and are blocked off at alternate ends to force the exhaust through the porous
walls. As the DPF collects ash and soot and the exhaust temperature reaches the appropriate level, oxidation of
the soot occurs. This process is called Regeneration.
The key to a successful regeneration is elevated exhaust temperatures for extended periods of time. This is
achieved by the engine electronic system automatically over the road. Without adequate exhaust temperatures for
regeneration, the filter will become saturated with soot. In some cases a parked regeneration may be necessary in
which the driver will be notified via dashboard lights. If the driver ignores this request and continues driving, the
engine electronic system will initiate derate and eventually shut down the engine, therefore requiring a parked
regeneration to continue driving.
