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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationLarge Bore Engines; Fuels; Advanced Combustion
PublisherAmerican Society of Mechanical Engineers
Volume1
ISBN (Electronic)9780791851982
DOIs
Publication statusPublished - 2018 Jan 1
EventASME 2018 Internal Combustion Engine Division Fall Technical Conference, ICEF 2018 - San Diego, United States
Duration: 2018 Nov 42018 Nov 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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  • Cite this

    Sok, R., Kusaka, J., Daisho, Y., Yoshimura, K., & Nakama, K. (2018). Effect of fuel injection timing during negative valve overlap period on a GDI-HCCI engine. In Large Bore Engines; Fuels; Advanced Combustion (Vol. 1). American Society of Mechanical Engineers. https://doi.org/10.1115/ICEF2018-9653