Eliminating sizing error in direct-driven hydraulics

Tatiana Minav, Shuzhong Zhang, Matti Pietola

Research output: Chapter in Book/Report/Conference proceedingConference contributionProfessional


This paper presents a realization of decentralized hydraulics for industrial applications and off-road machinery by means of direct-driven hydraulics (DDH). DDH consists of two pump/motor units driven by a servomotor. These units should be dimensioned to the match expected flows of the corresponding chamber in a differential cylinder. However, the sizing error between the available pump units causes an excess pressure rise in the chambers and degrades the system efficiency. Therefore, this paper investigates elimination of the sizing error with proposed solutions utilizing hydraulic accumulator and gear selection respectively. Created Matlab/Simulink models were utilized to investigate the system performance from an energy efficiency point of view. The results showed that both of the proposed solutions are viable approaches to improve the energy efficiency of the DDH setup. The proposed hydraulic solution was implemented in the DDH setup of a crane and measurements were
performed to validate the built DDH model.
Original languageEnglish
Title of host publicationThe 10th JFPS International symposium on Fluid Power, Fukuoka, Oct 24-27, 2017
Number of pages10
Publication statusPublished - 24 Oct 2017
MoE publication typeD3 Professional conference proceedings
Event JFPS International Symposium on Fluid Power - Fukuoka, Japan
Duration: 24 Oct 201727 Oct 2017
Conference number: 10


Conference JFPS International Symposium on Fluid Power


  • Direct-driven hydraulics (DDH)
  • Sizing error
  • Energy efficiency
  • Hydraulic accumulator
  • Gear

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