GHG17 Aftertreatment System
The GHG17 Aftertreatment System (ATS) is an airless dosing system. The Selective Catalytic Reduction (SCR) system consists of an Aftertreatment Control Module (ACM), a tank for Diesel Exhaust Fluid (DEF), a DEF pump, an airless DEF dosing unit, and an SCR module. DEF is pumped to the airless dosing unit through a high pressure DEF line at 10 bar (145 psi). The DEF dosing unit injects a fine mist of atomized DEF into the SCR module to produce a chemical reaction. This chemical reaction converts nitrogen oxides (NOx) present in the exhaust stream into water vapor and nitrogen.
The SCR inlet temperature and Diesel Particulate Filter (DPF) outlet pressure sensors have been eliminated for the GHG17 1-BOX™ ATS configured units. A Soot Probe has been added to the 1-BOX™ ATS configurations. A Sensor Control Unit (SCU) (2) has been added to the ATS and is directly wired to the Soot Probe (1).
The GHG17 platform will continue with Hydrocarbon (HC) Dosing (regeneration when the unit is driving over the road). A DEF-to-fuel ratio should be approximately 4.3%. Due to a change in fueling strategy, the driver may notice a change in engine noise during HC Dosing on the DD13 and DD15 platform.
- Exhaust Outlet
- Selective Catalytic Reduction (SCR Catalyst) Outlet NOx Sensor
- Selective Catalytic Reduction (SCR Catalyst) Outlet Temperature Sensor
- Soot Sensor
- 18-Pin Connectors
- Exhaust Inlet
- Diesel Oxidation Catalyst Inlet Pressure Sensor
- Selective Catalytic Reduction (SCR Catalyst) Inlet NOx Sensor