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The study based on hydrogen-diesel co-direct injection system: A correction algorithm for circulating gas injection mass

Author

Listed:
  • Yang, Xiyu
  • Yang, Fangliang
  • Dong, Quan
  • Shi, Cheng
  • Li, Nan
  • Zhang, Liang

Abstract

This study focuses on gas injection mass fluctuation in high-pressure hydrogen coupling direct injection technology for jet ignition, conducting research to optimize injection process stability. Investigating the fluctuation mechanism reveals that diesel pressure fluctuation induced by pilot injection is the fundamental cause for circulating gas injection mass fluctuation. It is found that the free diesel pressure oscillation within the fuel system and gas injection mass fluctuation at varying injection interval time both exhibit an under-damped oscillation pattern. In view of this, the research addresses stability optimization for gas injection mass from two aspects. On the one hand, the mechanism of the Helmholtz filter to reduce pressure fluctuation is explored in system structural aspect, and designed the structural parameters based on its resonant angular frequency. Then, the influence from different volumes on pressure fluctuation within the low-impedance region is analyzed. Through experimental verification, it is known that this method can reduce gas injection mass fluctuation, but it will decrease the total gas injection mass. On the other hand, an energizing time correction algorithm based on predictive model is proposed. By fitting and optimizing the each parameter sub-algorithms, the final corrected injection pulse width is obtained by combining the each parameter sub-algorithms. The results show that the Helmholtz filter can achieve a maximum reduction in gas injection mass fluctuation reaching 69.82 %. But compared with the original system, the total gas injection mass is reduced by about 7.4 %. The correction model can reduce the gas injection mass fluctuation reach up to 83.92 % and do not affect the total gas injection mass. The results can provide a theoretical basis for the advanced engine fuel injection process closed-loop control, and the experimental data can provide a reference for a dual-fuel injection system.

Suggested Citation

  • Yang, Xiyu & Yang, Fangliang & Dong, Quan & Shi, Cheng & Li, Nan & Zhang, Liang, 2025. "The study based on hydrogen-diesel co-direct injection system: A correction algorithm for circulating gas injection mass," Energy, Elsevier, vol. 319(C).
    • Handle: RePEc:eee:energy:v:319:y:2025:i:c:s0360544225007625
    DOI: 10.1016/j.energy.2025.135120
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