EPA10 Aftertreatment System

EPA10 Aftertreatment System - Ops

To meet EPA10 emission regulations, the traditional muffler was replaced by an Aftertreatment Device (ATD). The ATD consists of a Diesel Oxidation Catalyst (DOC), a Diesel Particulate Filter (DPF), and a Selective Catalyst Reduction (SCR) system. These components burn off collected particulate matter in a process called "regeneration" and reduce nitrous oxides (NOx). The key to successful regeneration is high exhaust temperature for an extended period of time. Without adequate temperatures for regeneration, the filter will continue to trap particulates and eventually plug. In order to avoid DPF plugging, Detroit™ uses an actively regenerated Aftertreatment System (ATS).

The exhaust from an on-highway diesel engine produces levels of nitrous oxide (NOx) that must be reduced. To meet EPA10 emission standards, a Selective Catalyst Reduction (SCR) system has been added to the current ATS. The SCR system consists of an Aftertreatment Control Module (ACM), a tank for Diesel Exhaust Fluid (DEF), a DEF pump module, an air control unit, a DEF metering unit, a DEF injector, and an SCR module. DEF is pumped through the metering unit to a DEF injector. The DEF injector meters DEF into the SCR module to produce a chemical reaction. This chemical reaction converts nitrous oxides (NOx) present in the exhaust stream into water vapor and nitrogen.

There are two different configurations available for different types of applications. Both configurations reduce the particulate matter more commonly known as soot and NOx generated by the engine.

1-BOX™ Aftertreatment Device

The "1-BOX™" configuration contains the Diesel Oxidation Catalyst (DOC) / Diesel Particulate Filter (DPF) and the Selective Catalytic Reduction (SCR Catalyst) in one single enclosed box.

  1. Diesel Oxidation Catalyst Outlet Temperature Sensor
  2. Diesel Oxidation Catalyst Inlet Pressure Sensor Elbow
  3. Diesel Oxidation Catalyst Inlet Temperature Sensor
  4. Front Heat Shield
  5. Diesel Exhaust Fluid Nozzle
  6. Exhaust Outlet
  7. Diesel Exhaust Fluid Metering Unit
  8. Sensor Box including Pressure Sensors
  9. Exhaust Inlet
  10. Selective Catalytic Reduction (SCR Catalyst) Outlet Temperature Sensor
  11. Selective Catalytic Reduction (SCR Catalyst) Outlet NOx Sensor
  12. Selective Catalytic Reduction (SCR Catalyst) Inlet NOx Sensor
  13. 14-Pin Connectors
  14. Diesel Particulate Filter Outlet Pressure Sensor Elbow
  15. Selective Catalytic Reduction (SCR Catalyst) Inlet Temperature Sensor
  16. Selective Catalytic Reduction (SCR Catalyst) Inlet and Outlet NOx Sensors (microprocessor mounted)
  17. Diesel Particulate Filter Outlet Pressure Sensor
  18. Diesel Oxidation Catalyst Inlet Pressure Sensor
  19. Diesel Particulate Filter Temperature Sensor

Fig. 1, 1-BOX™ Sensors

Two-Box Aftertreatment Device

The "Two-Box" configuration where the Diesel Oxidation Catalyst (DOC ) / Diesel Particulate Filter (DPF) and the (SCR Catalyst) are located in separate components and are mounted either vertically, horizontally, or both.

  1. Diesel Exhaust Fluid Metering Unit
  2. Diesel Exhaust Fluid Nozzle
  3. Selective Catalytic Reduction (SCR Catalyst) Outlet Temperature Sensor
  4. Selective Catalytic Reduction (SCR Catalyst) Inlet Temperature Sensor
  5. Diesel Oxidation Catalyst Inlet Temperature Sensor
  6. Diesel Oxidation Catalyst Inlet Pressure Sensor
  7. Diesel Particulate Filter Inlet Temperature Sensor
  8. Diesel Particulate Filter Outlet Pressure Sensor
  9. Diesel Particulate Filter Outlet Temperature Sensor
  10. Selective Catalytic Reduction (SCR Catalyst) Outlet NOx Sensor
  11. Selective Catalytic Reduction (SCR Catalyst) Inlet NOx Sensor

Fig. 2, 2V2 Two-Box Sensors

Note:
Parent topic: Aftertreatment System
Document Number: 0000022358
Manual Publication Date: 2024-03-05
Topic Publication Date: 2023-12-10