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DESCRIPTION AND OPERATION
ACTIVE REGENERATION
For vehicles that are unable to develop or sustain
adequate temperature, there is more than one
system for supplying sufficient heat.
34
Figure 34 — DPF Catalyzed System Diagram
In the catalyzed system (Figure 34), an
aftertreatment fuel injector (AFI) 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.
1. DPF Muffler
2. Temperature Sensors
3. Delta Pressure Differential 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
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