Digital Hydraulics

The digital hydraulics research group studies new energy efficient and high performance hydraulic actuator solutions. Modern and fast on/off valves are used instead of traditional analogue valves.

Research focus and goals

The research focuses on advanced control methods, energy efficiency and fast miniature on/off valves. The goal is to combine good energy efficiency and control performance while maintaining excellent power density of hydraulics.


Digital hydraulics has been applied in paper machines, excavator, Pendolino train and ITER fusion reactor remote maintenance system. In all cases, digital hydraulics approach has led to better performance, energy efficiency and/or reliability.

Contact person

Matti Linjama
Adjunct Professor
+358 40 849 0525

Main Publications

  • M. Paloniitty, and M. Linjama. “High-linear digital hydraulic valve control by an equal coded valve system and novel switching schemes.” Proc. Inst. Mech. Eng., Part I: J. Syst. Contr. Eng., vol. 232, no. 3 (2018): 258-269.
  • M. Huova, A. Aalto, M. Linjama, K. Huhtala, T. Lantela, and M. Pietola. “Digital hydraulic multi-pressure actuator–the concept, simulation study and first experimental results.” International Journal of Fluid Power, vol. 18, no. 3 (2017): 141-152.
  • M. Heikkilä, and M. Linjama. “Displacement control of a mobile crane using a digital hydraulic power management system.” Mechatronics, vol. 23, no. 4 (2013): 452-461.
  • M. Linjama. “Digital fluid power: State of the art.” in the 12th Scandinavian Int. Conf. on Fluid Power (SICFP), Tampere, Finland, pp. 18-20. (2011). [pdf]
  • M. Linjama, H.-P. Vihtanen, A. Sipola, and M. Vilenius. “Secondary controlled multi-chamber hydraulic cylinder.” in the 11th Scandinavian Int. Conf. on Fluid Power (SICFP), vol. 9, pp. 2-4. (2009).
  • M. Linjama, and M. Vilenius. “Improved digital hydraulic tracking control of water hydraulic cylinder drive.” International Journal of Fluid Power, vol. 6, no. 1 (2005): 29-39.