Economy and emission characteristics of the optimal dilution strategy in lean combustion based on GDI gasoline engine equipped with prechamber

Author:

Wang Li12,Huang Zhaoming2ORCID,Tao Wang3ORCID,Shen Kai4ORCID,Chen Weiguo5

Affiliation:

1. School of Mechanical and Electrical Engineering, Xuancheng Vocational and Technical College, Xuancheng, China

2. School of Mechanical Engineering, Wanjiang University of Technology, Ma'anshan, China

3. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, China

4. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, China

5. Engine Engineering Research Institute, Chery Automobile Co.,Ltd., Wuhu, China

Abstract

EGR and excess-air dilution have been investigated in a 1.5 L four cylinders gasoline direct injection (GDI) turbocharged engine equipped with prechamber. The influences of the two different dilution technologies on the engine performance are explored. The results show that at 2400 rpm and 12 bar, EGR dilution can adopt more aggressive ignition advanced angle to achieve optimal combustion phasing. However, excess-air dilution has greater fuel economy than that of EGR dilution owing to larger in-cylinder polytropic exponent. As for prechamber, when dilution ratio is greater than 37.1%, the combustion phase is advanced, resulting in fuel economy improving. Meanwhile, only when the dilution ratio is under 36.2%, the HC emissions of excess-air dilution are lower than the original engine. With the increase of dilution ratio, the CO emissions decrease continuously. The NOX emissions of both dilution technologies are 11% of those of the original engine. Excess-air dilution has better fuel economy and very low CO emissions. EGR dilution can effectively reduce NOX emissions, but increase HC emissions. Compared with spark plug ignition, the pre chamber ignition has lower HC, CO emissions, and higher NO emissions. At part load, the pre-chamber ignition reduces NOX emissions to 49 ppm.

Publisher

SAGE Publications

Subject

Mechanical Engineering

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