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Fuel injection rate variation of a piezoelectric injector according to the charge current patterns

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Abstract

The effects of charge current patterns on the injected fuel mass per stroke (IFMPS) were investigated. The charge and discharge currents supplied to a piezo injector are basically controlled by the peak and hold method. The hold current is controlled by PWM (pulse width modulation) control of the driving power supplied to the injector. The duty ratios of the PWM signal used for hold current control are varied. A variety of charge and discharge current waveforms to drive the piezo injector were generated by combining duty ratio control of the PWM waveform with the driving power source. An optimal piezo injector charge control condition to minimize the variation of the IFMPS under given fuel rail pressure and fuel injection duration values was investigated. When the fuel injection duration was short, the effect of the duty ratio of hold control on the average IFMPS deviation % from the average IFMPS was increased. The standard deviation of average IFMPS and average IFMPS deviation % can be reduced by lowering the peak charge current to obtain the target IFMPS.

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Acknowledgments

This study was supported by the Research Program funded by the Seoul National University of Science and Technology.

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Authors and Affiliations

  1. Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology, Seoul, 01811, Korea

    Ji Heum Baek & Choong Hoon Lee

Authors
  1. Ji Heum Baek
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  2. Choong Hoon Lee
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Correspondence to Choong Hoon Lee.

Additional information

Baek, Ji-Heum received his B.S. (2022) in Department of Automotive Engineering at Seoul National University of Science and Technology. His research interests are flow measurements and control of fuel injection system in automotive.

Lee, Choong-Hoon received his B.S. (1985), M.S. (1987), and Ph.D. degrees (1996) in Mechanical Engineering from Seoul National University. He worked as a diesel engine development engineer for Daewoo Heavy Industry for six years. He was a visiting research fellow at the Engine Research Center at the University of Wisconsin-Madison in 1997. He has worked in the Department of Automotive Engineering at Seoul National University of Technology as a Professor since 2000. His research interests are the measurement and control of sprays and flows.

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Baek, J.H., Lee, C.H. Fuel injection rate variation of a piezoelectric injector according to the charge current patterns. J Mech Sci Technol 38, 453–461 (2024). https://doi.org/10.1007/s12206-023-1237-4

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  • DOI: https://doi.org/10.1007/s12206-023-1237-4

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