Elektrohydraulic systems for the working equipment of mobile machinery
Research Task/Objectives
Electrohydraulic Flow Matching (EFM)
Control systems installed in the working hydraulic of mobile machinery are required to move several consumer parallel and independently. Nowadays, hydraulic-mechanical Load-Sensing Systems offer high potential regarding energy efficiency and system dynamics, which can be exploited by applying electrohydraulic control systems. By means of virtual and experimental analysis, new system solutions are systematically developed
and tested.
Approach/Results
Energy consumption of different working hydraulic systems
The basic idea of all solutions is to provide the required flow by means of electronic control. In contrast to conventional systems, the hydraulic connection to control the pump based on the highest load information is not needed. Thus, energy consumption is reduced and the response behavior is improved. When moving two consumers simultaneously, additional losses occur at the lower loaded consumer. By separating the supply into multiple circuits these losses can be eliminated. An appropriate coupling of the circuits is needed in order to maintain machine performance and operability. Studies on the excavator test rig proof the functionality and the possible energy savings.
The presented research activities are part of the project “Analysis and optimisation of new solutions for electro-hydraulic load-sensing systems of mobile machines" (Ref. No. HE 2715/4). The authors would like to thank the German Research Foundation (DFG) for the financial support.
Funded by:
