Conference article

Liselott Ericson
Department of Management and Engineering, Fluid and Mechatronic Systems, Linköping University, Linköping, Sweden

Samuel Kärnell
Department of Management and Engineering, Fluid and Mechatronic Systems, Linköping University, Linköping, Sweden

Martin Hochwallner
Department of Management and Engineering, Fluid and Mechatronic Systems, Linköping University, Linköping, Sweden

Download articlehttp://dx.doi.org/10.3384/ecp1714419

Published in: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden

Linköping Electronic Conference Proceedings 144:2, p. 19-27

Published: 2017-12-20

ISBN: 978-91-7685-369-6

ISSN: 1650-3686 (print), 1650-3740 (online)

Interest in the control of variable fluid power pumps/motors has increased in recent years. The actuators used are inefficient and expensive and this reduces the variable units’ usability. This paper introduces displacement control of pumps/motors by means of a rotating valve plate. By changing the angle of the valve plate, the effective use of the stroke is changed. The rotating valve plate is experimentally verified by a modified in-line pump. In the prototype, the valve plate is controlled with a worm gear connected to an electric motor. The results show potential for this kind of displacement control. However, the rotating valve plate creates pressure pulsations at part-displacement due to the commutation being performed at high piston speeds. If the piston speed and hence the flow from each piston is low, the pressure pulsation is acceptable.

[1] Karl Hartmann and Ludger Frerichs. Development of innovative solutions for displacement variation in hydrostatic machines. In 10th International Fluid Power Conference, volume 1, pages 427–440, 2016.

[2] P Achten. Dynamic high-frequency behaviour of the swash plate in a variable displacement axial piston pump. Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering published, 227(6):1–12, June 2013.

[3] Jan Lux and Hubertus Murrenhoff. Experimental loss analysis of displacement controlled pumps. In 10th International Fluid Power Conference (10. IFK), Dresden, Germany, March 8 - 10 2016.

[4] P Achten, Z Fu, and G Vael. Transformer future hydraulics: a new design of a hydraulic transformer. In Proc. of The 5th Scandinavian International Conference on Fluid Power, SICFP’97, Tampere, Finland, May 21-23 1997. CD.

[5] Junhee Cho, Xiaoping Zhang, Noah D. Manring, and Satish S. Nair. Dynamic modelling and parametric studies of an indexing valve plate pump. International Journal of Fluid Power, 3(3):37–48, 2002.

[6] T Grahl. Geräuschminderung an axialkolbenpumpen durch variable umsteuersysteme. O+P, Ölhydraulik und Pneumatik, 5:437–443, November 1989.

[7] Peter A.J. Achten and Georges E.M. Vael. ’shuttle’ technology for noise reduction and efficiency improvement of hydrostatic machines. In Proc. of The 7th Scandinavian International Conference on Fluid Power, SICFP’01, Linköping, Sweden, May 28-30 2001.

[8] A Johansson, R Werndin, and J-O Palmberg. Dynamic analysis of shuttle technique performance applied on hydraulic transformer. In Proc. of 3rd International Fluid Power Conference, IFK’3, volume 2, pages 249–261. Aachen, Germany, March 2002.

[9] K A Edge and J Darling. A theoretical model of axial piston pump flow ripple. Journal of Institution of Mechanical Engineers, 200(B1):45–54, September 1986.

[10] P Krus, A Jansson, J-O Palmberg, and K Weddfelt. Distributed simulation of hydromechanical systems. In Proc. of 3rd Bath International Fluid Power Workshop, Bath, UK, September 13-14 1990.

[11] H E Merritt. Hydraulic Control Systems. John Wileys and Sons, Cincinnati, Ohio, 1967. ISBN 0-471-59617-5.

[12] A Johansson, J Ölvander, and J-O Palmberg. Experimental verification of cross-angle for noise reduction in hydraulic piston pumps. Journal of Institution of Mechanical Engineers, Part I: J. Systems and Control Engineering, 221(I3):pp. 321–330, 2007.

[13] Emil Lindborg, Emma Sandström, Karin Gustafsson, Samuel Kärnell, Simon Ward, and Vincent Liljeholm. Displacement and pulsation control by implementation of a rotatable valve plate on a hydraulic piston pump. Technical report, Fluid and Mechatronic Systems, Department of Management and Engineering, Linköping Universiity, 2016. LIU-IEI-RR-16/00260-SE, Supervisors: Liselott Ericson and Martin Hochwallner.