ENGINE COMPONENT AND LOCATION 117 1 DPF Muffler 2 Temperature Sensor 3 Differential Pressure Sensor 4 Stack Pipe 5 Pipe Clamp 6 Outlet Module 7 Clamp 8 Filter 9 Catalyst 10 Inlet Module 11 Exhaust Pipe 12 Hose Clamp 13 Flex Pipe 14 Aftertreatment Fuel Injector 15 Turbocharger 16 Discharge Recirculation Valve 17 NOx Sensor An aftertreatment fuel injector (AFI) (Figure above), adds fuel to the exhaust stream as it leaves the turbocharger. The temperature of the exhaust at this point is hot enough to ignite the fuel which then produces the temperature required to clean the filters.
If needed, the discharge recirculation valve (DRV) reroutes some of the turbocharger output back through the turbocharger. This helps to maintain high exhaust temperature. The engine electronic control unit (EECU) controls the cycle based on information from back pressure sensors in the output stream. While the flow rate is correct, the AFI and the DRV are turned off. As with passive regeneration, the process is not complete. Remove the filters and physically remove the remaining material using the special machine for cleaning. The filters are reusable.