Effects of fuel temperature on injection performance of an EUP system

Fushui Liu, Ruo Hu, Yikai Li*, Ziming Yang, Hongming Xu

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review


The fuel temperature has a great influence on the characteristics of an electronic unit pump (EUP) system, especially on the injection performance. This paper studies the regularity of the high-pressure fuel supply system performance at different fuel temperatures. The injection quantity, the injection rate, the fuel pressure, and the needle lift were measured by the EUP system test bench. Investigation results showed that, with the increase of fuel temperature, the injection quantity and maximum injection rate decreased, the time of start injection was delayed, and the peak fuel pressure value decreased. For the needle valve, as the temperature was raised its closing time was advanced at low speed conditions but delayed at high speed conditions. In addition, the empirical equations for the fuel temperature effects on the circulating fuel injection quantity and peak pressure are proposed by the experimental test and simulation data. This study will help to further apply and study the engine, and provide a reference for engine fuel supply control system design.

Original languageEnglish
Pages (from-to)671-686
Number of pages16
JournalProceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
Issue number3
Early online date22 Dec 2017
Publication statusPublished - 1 Feb 2019


  • fuel pressure
  • Fuel temperature
  • injection quantity
  • injection rate
  • needle lift

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering


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