Study on Injection Characteristics for Hydraulic Free Piston Diesel Engines

Shuanlu Zhang, Changlu Zhao, Zhenfeng Zhao, Fujun Zhang, Ruina Zhao

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A hydraulic electronic unit injector was proposed for a hydraulic free piston diesel engine. The high pressure pump for the injector was replaced by the high pressure rail used for the engine. With the analysis of hydraulic electronic unit injector principle, the fuel injection characteristics were researched with Inov8 AKRIBIS II. The research focused on the effects of drive pressure and injection frequency on cyclic fuel injection quantity and injection delay. In order to analyze the effect of the rail pressure for the engine valve actuation on fuel injection process, an online test was carried out to measure fuel injection quantity. Results show that the valve actuation enlarges the cyclic fuel injection fluctuation (from -6.9% to +9.5%) because of the connection between the valve actuation and injector through their pressure rail, which affects stable engine operation. After the improvement of the high pressure rail system, a continuous engine test indicates that the fluctuation of cyclic fuel injection quantity and actual injection position affect the stability of engine operation, therefore the fluctuation of cyclic fuel injection quantity and injection delay should be reduced for the purpose of stable continuous engine operation.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalNeiranji Gongcheng/Chinese Internal Combustion Engine Engineering
Volume38
Issue number4
DOIs
Publication statusPublished - 15 Aug 2017

Keywords

  • Cyclical variation
  • Free piston engine
  • Fuel injection
  • Hydraulic plunger
  • Unit injector

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Zhang, S., Zhao, C., Zhao, Z., Zhang, F., & Zhao, R. (2017). Study on Injection Characteristics for Hydraulic Free Piston Diesel Engines. Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering, 38(4), 1-6. https://doi.org/10.13949/j.cnki.nrjgc.2017.04.001