Fluid Power Systems for Mobile Applicationswith a Focus on Energy Efficiency and Dynamic Characteristics

Mikael Axin

Linköping Studies in Science and Technology. Thesis No. 1595

Division of Fluid and Mechatronic Systems Department of Management and Engineering

Linköping University SE-581 83 Linköping, Sweden

www.liu.seLinköping 2013

Mikael A

xinFluid Pow

er Systems for M

obile Applications

2013

This thesis studies an innovative working hydraulic system design for mobile applications, referred to as flow control. The fundamental difference compared to load sensing systems is that the pump is controlled based on the operator’s command signals rather than feedback signals from the loads. This control approach enables higher energy efficiency and better dynamic characteristics compared to load sensing. In this research, both theoretical studies and practical implementations demonstrate the capability of flow control systems. Experiments show a reduced pump pressure margin and energy saving possibilities in a short loading cycle for a wheel loader application.