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Combined influence of injection pressure of gasoline direct-injected and ratio of ethanol port-injected on the performances in a spark-ignited ethanol port-injected plus gasoline direct-injected engine

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  • Gong, Changming
  • Huang, Wei
  • Liu, Fenghua

Abstract

Combined influences of injection pressure of gasoline direct-injected (IPgdi) and ratio of ethanol port-injected (Repi) on the performances in a spark-ignited ethanol port-injected plus gasoline direct-injected engine were investigated by experimentally. Four IPgdi of 8, 10, 12 and 14 MPa and three Repi of 0 %, 20 % and 40 % were tested at the engine speed of 1500 rpm, throttle opening of 10 % and excess air coefficient of 1.0. The study results show that increasing IPgdi and Repi had a efficiently influence on combustion performance and emissions. The influence of increasing Repi on the quality of mixture formation, the highest cylinder pressure, the highest heat release rate and the highest cylinder temperature at low IPgdi was greater than that at high IPgdi. Increasing IPgdi and Repi could obviously reduce ignition delay, combustion duration and coefficient of variation. The IPgdi had obviously influence on the CO, HC and NOX emissions in without ethanol port-injected, and high Repi had significantly influence on the CO, HC and NOX emissions compared to increasing IPgdi. The soot emission at IPgdi = 14 MPa and Repi = 40 % was around 89.8 % lower than that IPgdi = 8 MPa and Repi = 0 %. Therefore, increasing IPgdi and Repi could effectively reduce the soot emission.

Suggested Citation

  • Gong, Changming & Huang, Wei & Liu, Fenghua, 2025. "Combined influence of injection pressure of gasoline direct-injected and ratio of ethanol port-injected on the performances in a spark-ignited ethanol port-injected plus gasoline direct-injected engin," Energy, Elsevier, vol. 320(C).
    • Handle: RePEc:eee:energy:v:320:y:2025:i:c:s0360544225008436
    DOI: 10.1016/j.energy.2025.135201
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