Investigating Combustion Enhancement and Emissions Reduction with the Addition of 2H2 + O2 to a SI Engine

Effects of Gasoline-Air Enrichment with HRG Gas on Efficiency and Emissions of a SI Engine

“…On the whole, the effects of HRG addition emphasized by the experiments were attributed to the presence of hydrogen, the main component of the gas. These effects are actually close to those previously found in studies performed with hydrogen-enriched gasoline [5], [7], [17]. It was not possible to isolate a special effect of other species present in HRG.…”

“…Hydrogen production by the electrolysis of water, using directly or indirectly the engine output as a source for the energy needed, was the alternative also studied. It was found that the presence of oxygen as a product of water electrolysis would not produce a significant change in the engine performance, and the overall effect of the production of hydrogen was found energetically to be not viable over much of the engine operating range [16], [17].…”

Effects of hydrogen and oxygen enrichment on performance and emissions of an SI engine under idle operating condition

“…With improved COV imep values, the thermal efficiency may be improved. D'Andrea et al [66] and Ji and Wang [65] also obtained similar results in terms of cyclic variation. Fig.…”

“…The coefficient of variation according to indicated mean effective pressure (COV imep ) is the most frequently used method to estimate cyclic variation [65]. It mustn't exceed 10% so as not to affect the comfort of passengers negatively [66]. Lyon [36] proved that energy economy may be improved (6%) reducing cyclic variations.…”

Study of production optimization and effect of hydroxyl gas on a CI engine performance and emission fueled with biodiesel blends

“…Fuel consumption reduced [16], the torque and indicate mean effective pressure (IMEP) increased, the combustion time and cycle-to-cycle difference also reduced. However, the NO X emissions were found to be increased [17].…”