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Effects of Two Pilot Injection on Combustion and Emissions in a PCCI Diesel Engine

Author

Listed:
  • Deqing Mei

    (School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Qisong Yu

    (School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Zhengjun Zhang

    (School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Shan Yue

    (School of Business, Jinken College of Technology, Nanjing 210000, China)

  • Lizhi Tu

    (Shanghai FEV Powertrain Technology Company, Shanghai 200336, China)

Abstract

The effects of two pilot injections on combustion and emissions were evaluated in a single−cylinder turbocharged diesel engine, which operated in premixed charge compression ignition (PCCI) modes with multiple injections and heavy exhaust gas recirculation under the low load by experiments and simulation. It was revealed that with the delay of the start of the first pilot injection ( SOI−P1 ) or the advance of the start of second pilot injection ( SOI−P2 ), respectively, the pressure, heat release rate ( HRR ), and temperature peak were all increased. Analysis of the combustion process indicates that, during the two pilot injection periods, the ignition timing was mainly determined by the SOI−P2 while the first released heat peak was influenced by SOI−P1 . With the delay of SOI−P1 or the advance of SOI−P2 , nitrogen oxide (NOx) generation increased significantly while soot generation varied a little. In addition, increasing Q 1 and decreasing the second pilot injection quantity ( Q 2) can manipulate the NOx and soot at a low level. The advance in SOI−P2 of 5 °CA couple with increasing Q 1 and reducing Q 2 was proposed, which can mitigate the compromise between emissions and thermal efficiency under the low load in the present PCCI mode.

Suggested Citation

  • Deqing Mei & Qisong Yu & Zhengjun Zhang & Shan Yue & Lizhi Tu, 2021. "Effects of Two Pilot Injection on Combustion and Emissions in a PCCI Diesel Engine," Energies, MDPI, vol. 14(6), pages 1-14, March.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:6:p:1651-:d:517934
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    References listed on IDEAS

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    Cited by:

    1. Nikita Zuev & Andrey Kozlov & Alexey Terenchenko & Kirill Karpukhin & Ulugbek Azimov, 2021. "Detailed Injection Strategy Analysis of a Heavy-Duty Diesel Engine Running on Rape Methyl Ester," Energies, MDPI, vol. 14(13), pages 1-25, June.
    2. José Javier López & Oscar A. de la Garza & Joaquín De la Morena & Simón Martínez-Martínez, 2021. "Influence of Cavitation in Common-Rail Diesel Nozzles on the Soot Formation Process through Measuring Soot Emissions," Energies, MDPI, vol. 14(19), pages 1-11, October.
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    4. Tyler Simpson & Christopher Depcik, 2022. "Multiple Fuel Injection Strategies for Compression Ignition Engines," Energies, MDPI, vol. 15(14), pages 1-29, July.

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