The hardening of the legislation forces manufacturers to implement a correct exhaust gas after-treatment strategy in order to control and measure the engine emissions and allow the compliance with the new Stage V emission standards. These technical solutions which allow the containment of internal combustion engine emissions to within the limits established by the new regulations are:
DOC (Diesel Oxidation Catalyst), diesel oxidation catalyst designed specifically to reduce the emissions of carbon monoxide (CO), hydrocarbons (HC) and particulate matter (PM), converting the exhaust gases’ harmful matter in carbon dioxide (CO2) and water (H2O).
DPF (Diesel Particulate Filter), particle filter which retains the polluting particles present in exhaust gases, commonly known as soot.
SCR (Selective Catalytic Reduction), selective catalytic reduction process through the chemical reduction of nitrogen oxides (NOx) present in exhaust gases due to injection of AdBlue, an aqueous urea solution of 32,5 % water and 67,5 % deionized water.
EGR (Exhaust gas recirculation), recirculation or redirection of part of the exhaust gases with the objective of reducing the nitrogen oxide (NOx) content of the exhaust gases. This system tends to be employed along with DOC or DPF after-treatment systems, thus reducing particle emissions.