نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
Innovation in internal combustion engine design is crucial for advancing the automotive industry. In conventional spark-ignition (SI) engines, the mass of fuel delivered by the injector is highly dependent on the pressure differential across it and the injection duration. However, the downstream pressure at the injection point is difficult to control due to complex phenomena such as airflow separation and fuel vaporization, which complicates the accurate estimation of injected fuel mass. This study introduces a Gas Pressure Fueling System (GPFS) designed to enable precise, cycle-by-cycle measurement of injected fuel mass. Experiments were conducted on a single-cylinder research SI engine under specific operating conditions. First, baseline data were collected using a Conventional Engine Fueling System (CEFS) for over 550 consecutive cycles, recording cylinder pressure, intake manifold pressure, Top Dead Center (TDC), and crank angle signals. Subsequently, the engine was operated with the GPFS at various gas pressures, and for over 2500 consecutive cycles, the same engine parameters were recorded along with the total volume of consumed fuel, allowing for the estimation of the fuel injected per cycle. An extensive search identified a GPFS operating point that replicated the engine performance of the CEFS. A configuration with a gas pressure set 0.25 bar above the CEFS fuel line pressure was found to yield comparable performance. The data from these two cases—the baseline CEFS and the optimized GPFS—are examined and compared. The results demonstrate that the GPFS, operating at a 0.25 bar pressure increase, successfully matches the performance of the conventional system while simultaneously enabling the direct measurement of cycle-resolved injected fuel mass.
کلیدواژهها English
