Effect of fuel injection timing during negative valve overlap period on a GDI-HCCI engine

Ratnak Sok, Jin Kusaka, Yasuhiro Daisho, Kei Yoshimura, Kenjiro Nakama

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

Gasoline Direct Injection Homogeneous Charge Compression (GDI-HCCI) combustion is achieved by closing early the exhaust valves for trapping hot residual gases combined with direct fuel injection. The combustion is chemically controlled by multi-point auto-ignition which its main combustion phase can be controlled by direct injection timing of fuel. This work investigates the effect of single pulse injection timing on a supercharged GDI-HCCI combustion engine by using a four-stroke single cylinder engine with a side-mounted direct fuel injector. Injection of primary reference fuel PRF90 under the near-stoichiometric-boosted condition is studied. The fuel is injected during negative valve overlap (NVO) or recompression period for fuel reformation under low oxygen concentration and the injection is retarded to intake stroke for the homogeneous mixture. It is found that the early fuel injection in NVO period advances the combustion phasing compared with the retarded injection in the intake stroke. Noticeable slower combustion rate from intake stroke fuel injection is obtained compared with the NVO injection due to charge cooling effect. Zero-dimensional combustion simulations with multiple chemical reaction mechanisms are simulated to provide chemical understanding from the effect of fuel injection timing on intermediate species generations. The species such as C2H4, C3H6, CH4, and H2 are found to be formed during the NVO injection period from the calculations. The effects of single pulse injection timings on combustion characteristics such pressure rise rate, combustion stability, and emissions are also discussed in this study.

本文言語English
ホスト出版物のタイトルLarge Bore Engines; Fuels; Advanced Combustion
出版社American Society of Mechanical Engineers
1
ISBN(電子版)9780791851982
DOI
出版ステータスPublished - 2018 1 1
イベントASME 2018 Internal Combustion Engine Division Fall Technical Conference, ICEF 2018 - San Diego, United States
継続期間: 2018 11 42018 11 7

Other

OtherASME 2018 Internal Combustion Engine Division Fall Technical Conference, ICEF 2018
CountryUnited States
CitySan Diego
Period18/11/418/11/7

ASJC Scopus subject areas

  • Automotive Engineering
  • Mechanical Engineering
  • Fuel Technology

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