Martin Scherer
Karlsruhe Institute of Technology, Chair of Mobile Machines, Karlsruhe, Germany
Marcus Geimer
Karlsruhe Institute of Technology, Chair of Mobile Machines, Karlsruhe, Germany
B. Weiss
Karlsruhe Institute of Technology, Chair of Mobile Machines, Karlsruhe, Germany
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http://dx.doi.org/10.3384/ecp1392a53Published in: 13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden
Linköping Electronic Conference Proceedings 92:53, p. 531-540
Published: 2013-09-09
ISBN: 978-91-7519-572-8
ISSN: 1650-3686 (print), 1650-3740 (online)
The development of an innovative flow-on-demand electrohydraulic system for mobile forestry cranes is described in the present paper. To overcome functional principle related weaknesses of conventional hydraulic-mechanical Load-Sensing systems; this work breaks up the control pressure difference related dependence of the delivered oil flow. Rather the swivelling angle of the displacement pump is calculated by summing up the single consumer oil flows corresponding to the velocity requests of the machine operator. For the electrohydraulic spool valves; several advanced control strategy concepts are discussed; each of which leading to an energy efficient artificial but controlled undersupply. The energy saving potentials are derived from a characteristic forestry crane duty cycle via dynamic simulation methods. Further on; the system shall be set up in a prototype crane to validate simulation results and to pave the way to the market by demonstrating the system performance
Flow-on-demand; flow control; Load-Sensing; electrohydraulic; forestry crane; dynamic simulation; control strategy; energy efficiency; operability
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