Abstract
Regulations of fuel consumption have been reinforced. But the newest turbo gasoline direct injection (T-GDI) engine still fails to satisfy regulations for the 2020. Exhaust Gas Recirculation (EGR) can improve fuel conversion efficiency and also mitigate the knocking of T-GDI engine. However, EGR deteriorates combustion stability so that the engine can’t be operated on high EGR dilution. Hydrogen can ease this problem because hydrogen improves combustion stability. The objective of this research is to investigate hydrogen effects on EGR of T-GDI engine in terms of combustion stability. The engine was operated on 2800RPM, 160Nm at lambda 1. The results showed that hydrogen effects were verified. Burn duration decreased, combustion stability and indicated thermal efficiency were improved after hydrogen addition. Especially, cylindrical combustion stability was enhanced.
Keywords: Thermal efficiency, Hydrogen, EGR, Combustion stability