Simulation of combustion process in MTI4.244 diesel engine, in order to investigate the possibility of power enhancement and pollutant reduction

Since enhancing the engine power needs redesigning, in this work MTI4.244 diesel engine produced by Tabriz Motorsazan Company has been considered to simulate its combustion process. It has been simulated and linked to the turbocharger and gas exchange models, using integrated simulation in GT-Suite, in order to investigate the possibility of power enhancement and pollutant reduction. Then results of this simulation have been validated by the experimental data of engine which have been carried out in Motorsazan Company. In order to improve engine performance and emission characteristics simultaneously, the effects of injection timing and EGR percentage on combustion, performance and emission of this engine at full load conditions have been studied. For example, at 1350rpm, 9.53% improvement in power and 49.87% reduction in soot have been achieved by advancing injection to 2 CA-BTDC. This change of course causes 54.12% increase in NOx. Finally, using 20% EGR and injection advancing, reduction of soot and NOx together with engine power enhancement have been predicted.