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.
Содержание EPA2007 D13F
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