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Energy efficiency of a hydrostatic drive with proportional control compared with volumetric control

Abstract

There are uninvestigated areas connected with behaviour of elements in hydraulic systems with different structures. Unawareness of proportions of the energy, volumetric, pressure and mechanical losses in elements is often the case. Problems connected with energy efficiency are essential for improvement of functionality and quality of hydrostatic drive systems, characterised by unquestioned advantages but also by relatively low efficiency in comparison with other types of drive. Energy efficiency of hydrostatic transmissions, particularly those with throttling control of the motor speed, and also efficiency of the hydraulic servo-mechanism systems may be in fact higher than the values most often quoted in publications on the subject. Possibility of calculating the real value of the hydraulic system overall efficiency as a function of many parameters influencing it, becomes a tool of complete evaluation of the designed system quality. The paper compares efficiencies of systems with cylinder proportional control and efficiency of the system volumetric control by a variable capacity pump. Presented are also two schematic diagrams of the investigated hydrostatic systems, their principle of operation and problems of studying losses in elements and energy efficiency of systems consisting of a feed assembly, control set and cylinder.

Keywords:

hydrostatic system, control structures, proportional directional valve, cylinder, energy losses, energy efficiency

Details

Issue
Vol. 20 No. 3(79) (2013)
Section
Latest Articles
Published
08-10-2013
DOI:
https://doi.org/10.2478/pomr-2013-0030
Licencja:
Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Open Access License

This journal provides immediate open access to its content under the Creative Commons BY 4.0 license. Authors who publish with this journal retain all copyrights and agree to the terms of the CC BY 4.0 license.

 

Author Biography

Grzegorz Skorek,
Gdynia Maritime University, Faculty of Marine Engineering, Department of Engineering Sciences




Authors

Grzegorz Skorek

Gdynia Maritime University, Faculty of Marine Engineering, Department of Engineering Sciences

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