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.