Aftertreatment temperature control

Regeneration of a DPF burns off soot, but also raises exhaust gas temperature.

Meeting emissions regulations has required most OEMs to use an exhaust aftertreatment system or emissions control device. One of the aftertreatment system's primary functions is to capture and remove the particulate matter (PM) in the engine exhaust gas. A regeneration process is periodically used to oxidize the trapped PM and maintain the backpressure across the diesel particulate filter (DPF) to an acceptable level.

However, regeneration of the DPF temporarily elevates temperatures in the filter to eliminate soot, which can increase the temperature of the exhaust gas.