when compared to that of the conventional
petroleum fuels. Using biodiesel instead of diesel fuel
reduces emissions such as the overall life cycle of
carbon dioxide (CO
2), particulate matter (PM), carbon
monoxide (CO), sulfur oxides (SOx), volatile organic
compounds (VOCs), and unburned hydrocarbons (HC).
Hence, in order to meet the strict vehicular exhaust
emission norms worldwide, several exhaust
pre-treatment and post treatment techniques have been
employed in modern engines. Exhaust Gas
Recirculation (EGR) is a pre-treatment technique,
which is being used widely to reduce and control the
oxides of nitrogen (NO
x) emission from diesel engines
[1]. Various researchers reported that exhaust gas
recirculation technique is a useful technique to lower
the NOx emission from diesel engines.