Full Content is available to subscribers

Subscribe/Learn More  >

Analysis on the Adaptability of Two Different Hydraulic Energy Recovery Circuits on Various Machine Types and Work Cycles

[+] Author Affiliations
Henri Hänninen, Matti Pietola

Aalto University, Espoo, Finland

Paper No. FPMC2013-4470, pp. V001T01A043; 8 pages
  • ASME/BATH 2013 Symposium on Fluid Power and Motion Control
  • ASME/BATH 2013 Symposium on Fluid Power and Motion Control
  • Sarasota, Florida, USA, October 6–9, 2013
  • Conference Sponsors: Fluid Power Systems and Technology Division
  • ISBN: 978-0-7918-5608-6
  • Copyright © 2013 by ASME


In the task of improving the energy efficiency of a work machine, the implementation of an energy recovery system is in many cases the most effective solution. Simulations and measurements on two distinctive hydraulic recovery circuit types, implemented on a reach truck test bench, have indicated clearly different performance profiles with different work cycle types.

The first of the two systems is based on diverting the flow to be recovered directly to hydraulic accumulators utilizing a digital flow control unit. This system has been measured to exceed cyclic efficiency of 90 percent with optimal system settings in constant load scenarios. However, in mixed goods warehouses this efficiency can be significantly lower. The second recovery system, even though exhibiting slightly lower peak efficiency, has been measured to operate at relatively constant efficiency regardless of the work cycle type. This system is based on hydraulic transformer which varies the pressure/flow ratio in order to maximize the quantity of recovered energy.

In this study these two systems are analyzed in terms of their adaptability to different fork lift types and to different work cycles. The assessment is carried out by analyzing typical machine specific operation cycles, comparing machine complexity versus recovery circuit complexity and by estimations of build costs versus gains.

Copyright © 2013 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In