Influences of EGR and Alternative Fuels on Thermodynamic Parameters and Emissions of a Heavy-Duty Engine

Important goals in diesel engine research are the development of means to reduce the emissions, particularly of NOx, and PM and finding alternative fuels as crude oil resources run out. Experimental results from a heavy-duty DI diesel engine equipped with an external exhaust gas recirculation system (EGR) (the original engine had no EGR system) are used to analyse and compare the effects of different EGR rates, different EGR temperatures, different injection timings and different alternative fuels (RME, blends of RME with diesel fuel and O2 Diesel fuels (the blend of ethanol and diesel fuel)). The results presented here demonstrate that emissions can be reduced so that they minimally disadvantage specific fuel consumption under aforementioned operating conditions. In addition, thermodynamic parameters and the spectrum of cylinder pressure are also estimated and analysed.