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Efficiency potential of SI engines with gasoline and methanol: A 0D/1D investigation
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 06, 2021 by SAE International in United States
Event: SAE WCX Digital Summit
To meet the requirements of strict CO2 emission limitations in the future, internal combustion engines must have excellent efficiencies for a wide operating range. To achieve this goal, various technologies must be applied. Additionally, fuels other than gasoline should also be considered. In order to investigate the potential of the achievable efficiencies, a SI engine was designed and optimized using 0D/1D methods with GT-POWER. Some of the advanced features of this engine model include: High stroke-to-bore-ratio, variable valve timings with Miller cycle, EGR, cylinder deactivation, high turbulence concept, variable compression ratio and extreme downsizing. The fuel of choice was gasoline. With the proper application of technologies, the fuel consumption at the most relevant operating window could be decreased by around 10% in comparison to a state-of-the-art DISI four cylinder personal vehicle car engine. Furthermore, the potential of methanol as fuel was also investigated in the same manner. Thanks to its almost knock-free properties, the center of combustion could be kept at 8°CA aTDC at all times and compression ratios could even be increased by 4. Also, wall heat losses with methanol are significantly decreased because of the lower combustion temperatures. As a result, an approximately 10% further increase in efficiency at low and medium loads was observed. At higher loads the efficiency improvement was even higher, reaching around 25% at full load.