Abstract
This study investigates the impact of hydrogen enrichment on emissions from a spark-ignition internal combustion engine. A thermodynamic model was used to simulate engine performance with pure gasoline and a gasoline-hydrogen blend under various load conditions. The results show that hydrogen addition leads to a significant reduction in carbon monoxide and hydrocarbon emissions, particularly at low and medium loads. Despite a slight increase in combustion temperature, nitrogen oxide emissions were also reduced compared to pure gasoline operation. These improvements are attributed to hydrogen’s high reactivity, faster flame propagation, and better fuel-air mixture homogeneity. The proposed dual-injection combustion chamber further supports efficient hydrogen combustion and offers a promising solution for reducing emissions during the transition to low-carbon mobility.