The development of hydraulic components and systems concept has in recent decades been a clear focus on
energy efficiency and controllability. With today's components, such as electrically-driven pumps, motors and
valves, and electronic control systems have hydraulic technology flexibility significantly increased, which has
provided unique opportunities to build energy-efficient hydraulic system with good controllability. The
implementation of energy efficient systems is not simple, as it requires that the system concept closely matched
to the machine / vehicle primary power source, cycle and performance requirements, and that the hydraulic
system is integrated with the system's mechanical units so that frictional losses are minimized.
This article analyses some system solutions for mobile and industrial applications with regard to their energy
saving potential. Conventional systems are compared with energy-efficient systems and both valve and
pump-controlled mobile systems studied. Industrial system solutions discussed, especially the energy saving
potential of modern supply units offer. Use of accumulators for energy storage and energy recovery as well as
the hydraulic impact on system efficiency, are further examples of areas treated. Analysis shows that a plurality
of applications has a power budget potential of 20 - 50%, compared with the conventional system. In some
industrial systems can supply-units with speed-controlled fixed pumps and accumulator battery providing
energy savings up to 80%.
The National Conference on Fluid Power, "Hydraulikdagar'15" Linköping, Sweden, March 16-17, 2015