Experimental Investigation on CO2 Emission Characteristics of Modified SI-Engine with Direct Fuel Injection (DFI) Technique
Abstract
Modern two-stroke internal combustion (IC) engines offer superior weight, power, and cost advantages over four-stroke engines, making them ideal for light motorcycles and small aircraft. Despite their potential, optimizing efficiency and emissions in two-stroke engines requires a meticulous approach to piston chamber geometry, port locations, timing, compression ratio, and fuel composition. This study investigates the impact of integrating a Direct Fuel Injection (DFI) system into a two-stroke spark ignition (SI) engine to enhance performance and reduce emissions. Experimental results demonstrate significant improvements with DFI, including increases in peak pressure, mean effective pressure by 2.5%, and indicated power by 2.63%. These gains are attributed to more efficient combustion and reduced losses. The DFI system also shows marked reductions in emissions of CO, CO2, and hydrocarbons (HC), underscoring its environmental benefits. Comparisons between engines with and without injectors reveal that DFI-equipped engines consume less fuel, achieve better combustion efficiency, and emit fewer pollutants. Thermal efficiency improves with load increases in both engine types, highlighting DFI's potential to transform two-stroke engine performance and sustainability. Thus, the integration of DFI technology is a promising pathway for enhancing the efficiency and environmental friendliness of modern two-stroke engines.