ENGINE COMPONENT AND LOCATION 113 Exhaust Aftertreatment System New, stringent standards for exhaust emission control begin with the 2007 model year. The Exhaust Aftertreatment System (EATS) has been developed to act in combination with Ultra Low Sulfur Diesel (ULSD) fuel and the EGR system to reduce noxious emissions to meet the requirement. This new system treats the exhaust after it leaves the turbocharger on its way to the atmosphere. Exhaust Gas Recirculation Nitrous oxide (NOx) emission levels increase with combustion chamber temperatures.
The primary function of the Exhaust Gas Recirculation (EGR) system is to cool exhaust gas and recirculate exhaust gases back to the combustion chamber to lower the combustion temperature, thereby reducing nitrous oxide (NOx) emissions. Reducing the quantity of noxious compounds to an acceptable level beginning in the year 2007 requires altering their chemical composition. Directing the flow of exhaust gas through catalytic and particulate filters makes this happen. Particulate Matter The compounds remaining in the exhaust after passing through the EGR system contain extremely small particles of soot and ash called Particulate Matter (PM).
When these particles contact certain metals under high temperature, they are chemically transformed. The metals that cause this transformation are called catalysts.