Emission control can be achieved using advanced
combustion technologies and/or after-treatment systems.
As recognized the only possibility to achieve future limits
using internal measures is to combine available technologies
exhaust gas recirculation (EGR) [3,4]. The recirculation
of exhaust gases into the engine intake is a well-known
and established technology for NOx reduction [5,6].
However, the introduction of such systems in existing
diesel engine configuration requires ‘‘fine tuning’’ of
various parameters affecting engine operation. In this
way it becomes possible to recognize the limits in the
expected benefits (reduced pollutant emissions) and at the
same time avoid sacrificing existing ‘‘delighters’’ (such as
engine efficiency). The contribution of modelling is
significant to examine the effect of the various parameters
involved on both engine performance and pollutants
emissions. One important parameter is the temperature of
the recirculated exhaust gas.