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Influence of direct injected timing on the performance in a spark ignited dual-injection gasoline engine for an automotive under various injection modes

Author

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  • Gong, Changming
  • Yu, Jiawei
  • Liu, Fenghua

Abstract

Influence of direct injected timing (DIT) on the performance in a spark ignited port- and direct-injected (PI and DI) gasoline engine was studied experimentally. The results show that the best BMEP (brake mean effective pressure) and BTE (brake thermal efficiency) can be obtained at DIT = 280°CA bTDC. At a constant DIT, the BMEP and BTE of DI50 (50 % PI and 50 % DI of gasoline) injection mode (IM) are higher than those of DI100 (0 % PI and 100 % DI of gasoline) IM. The highest cylinder pressure, highest heat release rate and highest cylinder temperature can also achieve the maximum at DIT = 280°CA bTDC and various IMs, and their crank angle (CA) positions are closer to TDC (top dead center). The PI + DI IM is more propitious to ameliorate the combustibility of engine and carry out more stable combustion than DI IM. The DIT and IM have a significant influence on CO and NOX emissions. The DIT has a little influence and IM has an crucial influence on HC emission. The soot emission increases slightly with delayed DIT at DIT>80°CA bTDC, and then increases rapidly with further delayed DIT at DIT<80°CA bTDC.

Suggested Citation

  • Gong, Changming & Yu, Jiawei & Liu, Fenghua, 2025. "Influence of direct injected timing on the performance in a spark ignited dual-injection gasoline engine for an automotive under various injection modes," Energy, Elsevier, vol. 319(C).
    • Handle: RePEc:eee:energy:v:319:y:2025:i:c:s0360544225007911
    DOI: 10.1016/j.energy.2025.135149
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