| Home | KSAE | E-Submission | Sitemap | Contact Us |  
International Journal of Automotive Technology > Volume 23(2); 2022 > Article
International Journal of Automotive Technology 2022;23(2): 511-519.
doi: https://doi.org/10.1007/s12239-022-0047-5
Zhaoming Huang1, Li Wang1,2, Tao Wang3, Kai Shen4
1Wanjiang University of Technology
2Xuancheng Vocational and Technical College
3Nanjing University of Science and Technology
4University of Shanghai for Science and Technology
PDF Links Corresponding Author.  Tao Wang , Email. wangtao-me@njust.edu.cn
Dilution and Miller cycle are effective ways to reduce fuel consumption. Based in a 4-cylinder, 4-stroke, turbocharged, low pressure EGR, in-cylinder direct injection gasoline engine, with two intake camshaft angle (133 °CA, 170 °CA ), the effects of dilution (lean combustion, EGR) and Miller cycle on combustion and fuel economy at the minimum fuel consumption (2750 rpm, 11 bar) were studied. Besides, 1D engine simulation and 3D flow simulation are used to study the difference of combustion modes. When COVimep is less than 3 %, the BSFC of EGR is lower than that of lean combustion at the same dilution rate. The dilution limit of lean combustion is larger than EGR. When the dilution rates of EGR and lean combustion are 22 % and 35.9 %, respectively, the BSFC reaches the minimum, which decreases by 4.7 % and 7.2 % respectively. The specific heats ratio of lean combustion is larger than EGR, so the theoretical thermal efficiency of lean combustion is higher. Miller cycle reduces intake time and intake valve lift, which result in the tumble ratio and turbulent kinetic energy decrease significantly. EGR has greater fuel-saving potential for Otto cycle engine than Miller cycle.
Key Words: Dilution, Lean combustion, EGR, Gasoline engine, Fuel consumption
Editorial Office
21 Teheran-ro 52-gil, Gangnam-gu, Seoul 06212, Korea
TEL: +82-2-564-3971   FAX: +82-2-564-3973   E-mail: manage@ksae.org
About |  Browse Articles |  Current Issue |  For Authors and Reviewers
Copyright © The Korean Society of Automotive Engineers.                 Developed in M2PI
Close layer
prev next