GHG17 Medium Duty Aftertreatment System GHG17 Medium Duty Aftertreatment System GHG17 Medium Duty Aftertreatment System The GHG17 Medium Duty Aftertreatment System (ATS) is an airless dosing system. The ATS consists of a Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF), Selective Catalytic Reduction (SCR) hydrolysis Chamber, SCR catalyst, Aftertreatment Control Module (ACM), a tank for Diesel Exhaust Fluid (DEF), a DEF pump, and an airless DEF dosing unit.. 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 hydrolysis chamber to produce a chemical reaction. This chemical reaction converts nitrogen oxide (NOx), present in the exhaust stream, into water vapor and nitrogen. 40 All information subject to change without notice. Copyright © 2017 DETROIT DIESEL CORPORATION DDC-SVC-MAN-0192