Behavioural prediction of hydraulic step-up switching converters

Victor J. De Negri, Pengfei Wang, Andrew Plummer, D. Nigel Johnston

Research output: Contribution to journalArticlepeer-review

27 Citations (SciVal)
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In this paper the fundamental principles of energy-conservative hydraulic control based on the fluid inertance principle are discussed and a detailed analysis of step-up switched-inertance control is presented. A non-loss system comprising an inertance tube and switching valve is modelled and its operational curves are presented as a reference for an ideal behaviour. Considering the load loss at both the tube and the PWM switched valve, a linear mathematical model for the step-up switched-inertance hydraulic system is presented which describes the pressure response as a function of the PWM duty cycle. Mathematical expressions of the flow rates through the tube and the supply and return ports as well as the system efficiency are also presented. A system prototype is evaluated on a test rig and the experimental data compared with the theoretical results, demonstrating the model accuracy. The proposed model simplifies the analysis process for step-up switching converters and thus their restrictions and potential can be investigated more quickly.
Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalInternational Journal of Fluid Power
Issue number1
Early online date21 Mar 2014
Publication statusPublished - 21 Mar 2014


  • digital hydraulics
  • hydraulic switching converter
  • hydraulic valve
  • PWM switched valve


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