Benchmark Study of Internal Combustion Engines for Green Vehicles

• Main Authors: Jhuo-Yu Lu, 呂倬宇
• Other Authors: Yuh-Yih Wu
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/zu8u8m

碩士 === 國立臺北科技大學 === 車輛工程系 === 106 === In the recent decades, energy shortage and greenhouse effect have become two of the most critical issues around the world, which forces every countries to regulate more severe emission standards for vehicles. Especially, the Europe Union has stipulated that the average CO2 emissions of new cars must be reduced to 95 grams per kilometer in 2020. Before electric cars are popularized, internal combustion engines remain as the mainstream power units for vehicles. Therefore, automotive manufacturers around the world are making every effort to develop energy-saving technologies, including Gasoline Direct Injection (GDI), Atkinson Cycle, Hybrid Electric Vehicles (HEV), etc. In Taiwan, the development of internal combustion engine technologies started relatively later. In order to assess the domestic engine’s competitiveness in the global market, establishing performance and fuel consumption benchmarks were done by paper and data survey initially in this study. Subsequently, a 1.5-liter gasoline direct injection turbocharged prototype engine was adopted for a testing experiment. Finally, the target engine would be analyzed according to the comparison between experimental and benchmark data. According to the testing results, the target engine’s performance value locates within a standard deviation of benchmark value. However, the Brake Specific Fuel Consumption (BSFC) is notably above the benchmark average. In addition, its brake thermal efficiency is also below the benchmark average, which indicates that there is still room for improvement with regards to the target engines energy-saving feature. In addition, the target engine has been planned to deploy on gasoline vehicles, Hybrid Electric Vehicles, or Plug-in Hybrid Vehicles after mass production. Therefore, in this study, fuel economy data of Vehicles with GDI engines have also been surveyed as the reference basis for vehicle’s mass production task in the future. Moreover, this study also focuses on discussing key technologies of energy saving and considering cost-effective issues through literature review, and proposed the ideal methodology of improving target engine’s thermal efficiency by modifying to long expansion stroke engine design according to its position.