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Multiple injection for improving knock, gaseous and particulate matter emissions in direct injection SI engines

Author

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  • Han, Taehoon
  • Singh, Ripudaman
  • Lavoie, George
  • Wooldridge, Margaret
  • Boehman, André

Abstract

Advances in fuel injector technology have enabled research and development on a large variety of direct injection spark ignition (DISI) engine fueling strategies targeted to improve engine performance and reduce engine-out emissions. This study explores the effect of multiple injections on knock, engine efficiency and stability, and particulate number and gaseous emissions on a single-cylinder DISI research engine. Work to date on multiple injections in the literature is reviewed, and then two aspects of multiple injection strategies are experimentally investigated: the number of injections (up to five times in a cycle); and the timing of the injections (classified relative to the timing of intake valve opening and closing). A boosted, single-cylinder research engine equipped with a state-of-the-art piezoelectric hollow cone spray direct injector and research-grade E10 gasoline was used for the study. The results show multiple injections maintain torque and combustion stability compared with single injection and slightly increase the knock limits and indicated thermal efficiencies (maximum 0.7% absolute, 2.8% relative compared with single-injection baseline) due to improved heat release phasing, especially with an additional late injection during the intake valve closed (compression stroke) period. The gaseous pollutant emissions including nitrogen oxides and unburned hydrocarbons were reduced by 25% with multiple injections, particularly with injection during the compression stroke. In contrast, carbon monoxide emissions increased with multiple injections for all conditions. Increasing the number of injection events significantly reduced particulate number emissions (half with each additional injection), and the decrease in particulate number was not sensitive to the injection timing.

Suggested Citation

  • Han, Taehoon & Singh, Ripudaman & Lavoie, George & Wooldridge, Margaret & Boehman, André, 2020. "Multiple injection for improving knock, gaseous and particulate matter emissions in direct injection SI engines," Applied Energy, Elsevier, vol. 262(C).
    • Handle: RePEc:eee:appene:v:262:y:2020:i:c:s0306261920300908
    DOI: 10.1016/j.apenergy.2020.114578
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    References listed on IDEAS

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    Cited by:

    1. Qinglin Zhang & Zhaoping Xu & Shuangshuang Liu & Liang Liu, 2020. "Effects of Injector Spray Angle on Performance of an Opposed-Piston Free-Piston Engine," Energies, MDPI, vol. 13(14), pages 1-17, July.
    2. Novella, Ricardo & García, Antonio & Gomez-Soriano, Josep & Fogué-Robles, Álvaro, 2023. "Exploring dilution potential for full load operation of medium duty hydrogen engine for the transport sector," Applied Energy, Elsevier, vol. 349(C).
    3. Yousefi, Amin & Guo, Hongsheng & Birouk, Madjid, 2020. "Split diesel injection effect on knocking of natural gas/diesel dual-fuel engine at high load conditions," Applied Energy, Elsevier, vol. 279(C).
    4. Fan, Qinhao & Liu, Shang & Qi, Yunliang & Cai, Kaiyuan & Wang, Zhi, 2021. "Investigation into ethanol effects on combustion and particle number emissions in a spark-ignition to compression-ignition (SICI) engine," Energy, Elsevier, vol. 233(C).

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