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Correction strategy of fuel injection quantity during pilot-main injection for common rail system

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Abstract

Common rail system is a key technology of energy saving and emission reduction for modern diesel engines. Multiple injection, as one of the most interesting features of common rail system, allows both optimal fuel consumption and exhaust emissions. In order to explore the method for controlling the fluctuation of fuel injection quantity during multiple injection, experiments have been carried out in this paper, focusing on pilot-main injection. The high pressure fuel circuits of the system have been equivalent to a spring-mass vibration system. Comparison with the experiment shows that the proposed fluctuation equation can reasonably predict the fluctuation characteristics of main injection quantity with pilot-main injection interval. The correction control strategy for the main injection quantity fluctuation has been proposed, in which the relative damping coefficient, rail pressure, pilot-main injection interval and main injection pulse width are chosen as the input variables. The experimental results with different rail pressure and main injection quantity show that the fluctuation of injection quantity during pilot-main injection can be controlled effectively by the proposed correction strategy. The maximum average fluctuation of main injection quantity decreases by as much as 44.66 %.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (grant numbers NSFC 51809063, NSFC 51679048); China Postdoctoral Science Foundation (grant number 2018M630344); and Hei Long Jiang Postdoctoral Foundation (grant number LBH-Z18048).

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Authors and Affiliations

  1. College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China

    Yun Bai, Yuanqi Gu, Qi Lan, Liyun Fan & Xiuzhen Ma

Authors
  1. Yun Bai
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  2. Yuanqi Gu
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  3. Qi Lan
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  4. Liyun Fan
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  5. Xiuzhen Ma
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Correspondence to Yun Bai.

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Recommended by Editor Yong Tae Kang

Yun Bai received his B.S. degree in Engineering Mechanics from Shenyang Aerospace University, China in 2011. He received his Ph.D. in Power Engi-neering and Engineering Thermophysics from Harbin Engineering University, China in 2017. His research interests include modeling and simulation of diesel engine power plants, and optimization of diesel engines fuel injection system.

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Bai, Y., Gu, Y., Lan, Q. et al. Correction strategy of fuel injection quantity during pilot-main injection for common rail system. J Mech Sci Technol 34, 2647–2656 (2020). https://doi.org/10.1007/s12206-020-0538-0

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  • DOI: https://doi.org/10.1007/s12206-020-0538-0

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