Methanol and OMEx as fuel candidates to fulfill the potential EURO VII emissions regulation under dual-mode dual-fuel combustion

Recent investigations show that there are different combustion strategies promise to achieve higher efficiencies in internal engines. Advanced modes such as reactivity controlled compression ignition (RCCI) and dual-mode dual-fuel (DMDF) have proven be able low NOx soot engine-out emissions while being operate over the complete engine map. On another front, intensive research has been done fuels field. Oxygenated fuels, like oxymethylene dimethyl ethers (OMEx) methanol, of special interest because their potential reduce emissions, allowing adjust parameters, EGR, values also avoid other problems excessive in-cylinder peaks pressure. In this research, effects diesel-methanol OMEx-gasoline were studied on a (DFDM) multi-cylinder at 1800 rpm for various loads (25, 50, 80 100%). To do so, dedicated calibration optimize brake thermal efficiency trying maintain under EURO VI limitations was applied. Then, characteristics, performance results compared base diesel-gasoline case. Boundary conditions (intake pressure, temperature air mass) each fuel combination where similar, with exception premixed energy ratio, which average 20% lower diesel-methanol. Each was, weighted against by means an merit function, lowest value closest approximation ideal BSFCeq, BSNOx, BSSoot, BSCO BSHC targets. Results presents no significant differences respect terms equivalent BSFCeq NOx, substitution diesel OMEx of, although penalizing HC CO not only achieving (0.4 g/kWh) limits but future VII (0.2 well negligible production allows using EGR levels up 50%.