The Fuel Economy Improvement through the Knock Margin Expansion in a Turbocharged Gasoline Direct Injection Engine

2018 ◽  
Author(s):  
Ji Yong Shin ◽  
Chansoo Park ◽  
Jinyoung Jung ◽  
Choongsik Bae
Keyword(s):  
Fuel Economy ◽  
Direct Injection ◽  
Gasoline Direct Injection ◽  
Direct Injection Engine ◽  
Gasoline Direct Injection Engine ◽  
Fuel Economy Improvement

Impact of injector tip deposits on gasoline direct injection engine combustion, fuel economy and emissions

2020 ◽  
Vol 262 ◽  
pp. 114538 ◽  
Author(s):  
Wenbin Zhang ◽  
Zhou Zhang ◽  
Xiao Ma ◽  
Omar I. Awad ◽  
Yanfei Li ◽  
...  
Keyword(s):  
Fuel Economy ◽  
Direct Injection ◽  
Gasoline Direct Injection ◽  
Direct Injection Engine ◽  
Gasoline Direct Injection Engine ◽  
Engine Combustion

scholarly journals Experimental study on the effects of the Miller cycle on the performance and emissions of a downsized turbocharged gasoline direct injection engine

2020 ◽  
Vol 12 (5) ◽  
pp. 168781402091872
Author(s):  
Zhao-Ming Huang ◽  
Kai Shen ◽  
Li Wang ◽  
Wei-Guo Chen ◽  
Jin-Yuan Pan
Keyword(s):  
Compression Ratio ◽  
Fuel Economy ◽  
Direct Injection ◽  
Gasoline Direct Injection ◽  
Miller Cycle ◽  
Power Performance ◽  
Direct Injection Engine ◽  
Performance And Emission ◽  
Gasoline Direct Injection Engine ◽  
Partial Load

The Miller cycle has been proven to be an effective way to improve the thermal efficiency for gasoline engines. However, it may show insufficient power performance at certain loads. In this study, the objective is to exploit the advantages of the Miller-cycle engines over the original Otto-cycle engines. Therefore, a new camshaft profile with early intake valve closure was devised, and two various pistons were redesigned to obtain higher compression ratio 11.2 and 12.1, based on the original engine with compression ratio 10. Then, a detailed comparative investigation of the effects of Miller cycle combined with higher compression ratio on the performance and emission of a turbocharged gasoline direct injection engine has been experimentally carried out based on the engine bench at full and partial loads, compared to the original engine. The results show that, at full load, for a turbocharged gasoline direct injection engine utilizing the Miller cycle, partial maximum power is compromised about 1.5% while fuel consumption shows a strong correlation with engine speed. At partial load, since the Miller effect can well reduce the pumping mean effective pressure, thus improves the fuel economy effectively. In addition, the suppression of the in-cylinder combustion temperature induced by the lower effective compression ratio contributes to the reduction of nitrogen oxide emission greatly. However, the total hydrocarbon emission increases slightly. Therefore, a combination of the Miller cycle and highly boosted turbocharger shows great potential in further improvement of fuel economy and anti-knock performance for downsized gasoline direct injection engines.

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