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Experimental Investigation on the High-frequency Pressure Oscillation Characteristics of a Combustion Process in a DI Diesel Engine

Author

Listed:
  • Xu Zheng

    (College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China)

  • Nan Zhou

    (College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China)

  • Quan Zhou

    (College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China)

  • Yi Qiu

    (College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China)

  • Ruijun Liu

    (College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
    Engine Business Division, FAW Jiefang Automotive Co, Ltd., Wuxi 214000, Jiangsu, China)

  • Zhiyong Hao

    (College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China)

Abstract

It is difficult to decompose the in-cylinder pressure of combustion of the direct injection (DI) diesel engine, a transient process associated with complicated oscillation components, because of its steep property. An adaptive cyclic average method based on time varying filter based empirical mode decomposition (TVF-EMD) is proposed to decompose the in-cylinder pressure signal, and the cyclic number is determined adaptively with protruding ratio of high-frequency oscillation. The proposed method is used to compare with the ensemble empirical mode decomposition and original TVF-EMD. The results indicate that the proposed method can overcome the drawbacks of these methods and extract high-frequency oscillations accurately and effectively. Three evaluation indexes, center frequency, normalized energy, and average center frequency are defined to analyze the frequency and energy characteristics of high-frequency oscillation quantitatively. The influence of speed, load, rail pressure, main injection timing, pilot injection interval, and pilot injection quantity are investigated systematically. The energy of high-frequency oscillation reaches the peak at medium-high speed, and increase with engine load and rail pressure. However, the relationship of high-frequency oscillation with fuel injection parameters are non-monotonic.

Suggested Citation

  • Xu Zheng & Nan Zhou & Quan Zhou & Yi Qiu & Ruijun Liu & Zhiyong Hao, 2020. "Experimental Investigation on the High-frequency Pressure Oscillation Characteristics of a Combustion Process in a DI Diesel Engine," Energies, MDPI, vol. 13(4), pages 1-25, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:4:p:871-:d:321444
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    References listed on IDEAS

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