Open accumulator concept for compact fluid power energy storage

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

35 Scopus citations

Abstract

Energy storage devices for fluid power applications that are significantly more compact than existing ones will enable energy regeneration for many applications, including fluid power hybrid vehicles and construction equipment. The current approach to hydraulic energy storage makes use of a compressed gas enclosed in a closed chamber. As the system must contain the expanded gas and the hydraulic oil displaced, the optimal energy density occurs at a modest expansion ratio resulting in a small energy density. By allowing intake and exhaust of compressed and expanded air from and to the atmosphere, a potential order of magnitude increase in energy density is available in the new open accumulator approach. Potential methods for realizing the new configuration are described. Analysis and simulation case studies illustrate both the advantages and challenges of the new approach.

Original languageEnglish (US)
Title of host publicationDesign, Analysis, Control and Diagnosis of Fluid Power Systems
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages127-140
Number of pages14
ISBN (Electronic)0791842983
DOIs
StatePublished - 2007
EventASME 2007 International Mechanical Engineering Congress and Exposition, IMECE 2007 - Seattle, United States
Duration: Nov 11 2007Nov 15 2007

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume4

Other

OtherASME 2007 International Mechanical Engineering Congress and Exposition, IMECE 2007
CountryUnited States
CitySeattle
Period11/11/0711/15/07

Keywords

  • Accumulators
  • Closed accumulators
  • Control systems
  • Energy density
  • Hydraulic pump-motor
  • Open accumulators
  • Pneumatic motor-compressor
  • Regeneration

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