Assessment of hydraulic power trains in mobile working machines

M. Gallmeier, H. Auernhammer

Research output: Contribution to journalArticlepeer-review


Module adaptation within drivelines is an important aspect to increase machine efficiency in future. Speed adaptable module drives, a basic requirement therefore, seems to be also realizable by electric power trains. For identifying its capability the new approach must be assessed compared to the common hydraulic systems. Therefore a method is introduced to generate a statistically ensured basis for hydraulic capability the electric power trains have to compete with. For a realistic reference the load progression of typical hydraulic module drives is measured. In doing so it is important to comprise the usual harvesting conditions with changing weather, soil and drivers. In order to limit work load these data are reduced to typical test cycles which are afterwards applied in simulations and test stand work. These are sources for conclusions on objective and measurable criteria. Overall efficiency and the used power-to-weight ratio are identified as characterising criteria especially for power trains in mobile applications. Based on the module efficiency maps the transmission behaviour of hydraulic circuits as a whole is investigated by simulation. Additionally occurring losses are analysed and the installed power-to-weight ratios are derived.

Original languageEnglish
Pages (from-to)509-516
Number of pages8
JournalVDI Berichte
Issue numberSPEC. ISS.
StatePublished - 2005


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