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<p>Homogeneous charge compression ignition mode engines operate with low emissions and better fuel economy, providing smart solutions to address the challenges of diesel engines. In this study, two different techniques for introducing waste plastic pyrolysis oil (WPPO), an external homogeneous charge preparation and internal homogeneous charge preparation within a WPPO/diesel homogeneous charge compression ignition (HCCI) combustion mode. The tested approaches were port fuel injection with fuel vaporizer (PFI-HCCI) and early pilot direct injection (EPDI-HCCI). For the study, test fuels (pure diesel (D100), WPPO 20%) were prepared by blending pure diesel with biodiesel with waste plastic pyrolysis oil. Experiments were carried out in a computerized 4-stroke single-cylinder constant speed of 1500 diesel engine that was converted into HCCI mode. The results verified that the early pilot direct injection method can significantly reduce carbon monoxide (CO) and unburned hydrocarbon (UHC) emissions compared with port fuel injection with fuel vaporizer (PFI-HCCI) with diesel operation. At the most critical condition, full load, unburned hydrocarbon decreased by (57.14%) and CO (20.07%) in EPDI WPPO20% compared to port fuel injection with fuel vaporizer (PFI-HCCI). But the techniques showed variations in combustion intensity and stability. EPDI produced the most premixed combustion performance, leading to the highest rise in cylinder pressure. At full load condition, maximum cylinder pressure reached 38.18% in EPDI WPPO20%, but the heat release rate was decreased by 24.46% as compared with port fuel injection with fuel vaporizer (PFI-HCCI). In terms of performance, at full load conditions, the PFI and vaporizer WPPO 20 had the greatest brake thermal efficiency (BTE) (37%) compared to port fuel injection and vaporizer D100, early pilot direct injection (EPDI D100), and EPDI WPPO 20. Overall, the EPDI seems to be the safest and most successful technology, offering higher CO and UHC emission reduction while decreasing knock propensity and incomplete oxidation.</p>

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Combustion characteristics and performance in a pilot injection HCCI engine using diesel and WPPO 20 biodiesel blend

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • R. Jyothu Naik,
  • Chandrmani Yadav,
  • Sachin Ghalme

摘要

Homogeneous charge compression ignition mode engines operate with low emissions and better fuel economy, providing smart solutions to address the challenges of diesel engines. In this study, two different techniques for introducing waste plastic pyrolysis oil (WPPO), an external homogeneous charge preparation and internal homogeneous charge preparation within a WPPO/diesel homogeneous charge compression ignition (HCCI) combustion mode. The tested approaches were port fuel injection with fuel vaporizer (PFI-HCCI) and early pilot direct injection (EPDI-HCCI). For the study, test fuels (pure diesel (D100), WPPO 20%) were prepared by blending pure diesel with biodiesel with waste plastic pyrolysis oil. Experiments were carried out in a computerized 4-stroke single-cylinder constant speed of 1500 diesel engine that was converted into HCCI mode. The results verified that the early pilot direct injection method can significantly reduce carbon monoxide (CO) and unburned hydrocarbon (UHC) emissions compared with port fuel injection with fuel vaporizer (PFI-HCCI) with diesel operation. At the most critical condition, full load, unburned hydrocarbon decreased by (57.14%) and CO (20.07%) in EPDI WPPO20% compared to port fuel injection with fuel vaporizer (PFI-HCCI). But the techniques showed variations in combustion intensity and stability. EPDI produced the most premixed combustion performance, leading to the highest rise in cylinder pressure. At full load condition, maximum cylinder pressure reached 38.18% in EPDI WPPO20%, but the heat release rate was decreased by 24.46% as compared with port fuel injection with fuel vaporizer (PFI-HCCI). In terms of performance, at full load conditions, the PFI and vaporizer WPPO 20 had the greatest brake thermal efficiency (BTE) (37%) compared to port fuel injection and vaporizer D100, early pilot direct injection (EPDI D100), and EPDI WPPO 20. Overall, the EPDI seems to be the safest and most successful technology, offering higher CO and UHC emission reduction while decreasing knock propensity and incomplete oxidation.