Effects of Rate-Shaped and Multiple Injection Strategies on Pollutant Emissions, Combustion Noise and Fuel Consumption in a Low Compression Ratio Diesel Engine

摘要: An experimental investigation has been carried out to highlight the effects of different injection strategies on performance and emissions a low compression ratio Euro 5 diesel engine operated with high EGR rates. Rate-shaped main injections, achieved piezoelectric solenoid injectors by means boot fusion, respectively, as well optimized multiple patterns have compared. The results comparisons, performed reference state-of-the-art double pilot-Main (pM) strategy, are presented in terms engine-out exhaust emissions, combustion noise (CN) fuel consumption. when included delayed patterns, shown minor influence reducing NOx, while slight deterioration soot found. Both pilot schedule able reduce CN at loads. A higher reduction obtained an fusion event. Finally, DoE triple quadruple led improved soot-NOx trade-offs, respect pM calibration. In fact, splitting helps entrain air inside plumes, thus creating locally leaner mixture (less prone forming soot) allowing increasing rates (reducing NOx formation).