Utilization of Hydrotreated Vegetable Oil (HVO) in a Euro 6 Dual-Loop EGR Diesel Engine: Behavior as a Drop-In Fuel and Potentialities along Calibration Parameter Sweeps

This study examines the effects on combustion, engine performance and exhaust pollutant emissions of a modern Euro 6, dual-loop EGR, compression ignition running regular EN590-compliant diesel hydrotreated vegetable oil (HVO). First, potential HVO as “drop-in” fuel, i.e., without changes to original, baseline diesel-oriented calibration, was highlighted compared results. showed how use can reduce engine-out soot (by up 67%), HC CO 40%), while NOx levels remain relatively unchanged. Fuel consumption also reduced, by about 3%, slightly lower combustion noise were detected, too. has viscosity higher cetane number than diesel. Since these parameters have significant impact mixture formation subsequent process, an pre-calibrated for fuel could not fully exploit another sustainable fuel. Therefore, most influential calibration available tested platform, high-pressure low-pressure injection pressure, main timing, pilot quantity dwell-time, analyzed along single-parameter sweeps. The substantial reduction in soot, brought give possibility implement additional measures limit emissions, and/or For example, proportion LP EGR smaller be exploited with HVO, at low load, greater extent diesel, incurring penalties terms incomplete species. Conversely, delayed timings reduced rail pressure exceeding case.