m.v kumar - NIT Warangal, Research scholar, mechanical department, Warangal, telangana-۵۰۶۰۰۴, India
a.v badu - NIT Warangal, Assistant professor, mechanical department, Warangal, telangana-۵۰۶۰۰۴, India
p.r kumar - NIT Warangal, Professor, mechanical department, Warangal, telangana-۵۰۶۰۰۴, India
b narendra - NIT Warangal, M-tech, mechanical department, Warangal, telangana-۵۰۶۰۰۴, India

In various countries around the world, the emissions of NOX from petrol/gasoline and diesel engine vehicles are restricted by legislation. NOX is produced in the combustion chamber of engines at hightemperatures and high pressure. One of the most promising technology for effective control of NOX emissions is Exhaust Gas Recirculation (EGR) and now most modern engines require exhaust gas recirculation to meet emission standards. EGR lowers the presence of oxygen concentration and burn temperature in the combustion chamber and hence controls the NOx. The experimentation was carriedout on a 5.2 kW of single cylinder four stroke direct injection diesel engines in computerized mode to investigate the performance, emissions and combustion parameters at different EGR ratios (10, 20 and30%). From the results, O2, NOX and exhaust temperatures are found to be reduced whereas HC and CO emissions are increased as the EGR concentration increases

DI Engine ,,EGR,Diesel Engine,Oxides of Nitrogen,,