The paper shows a hydraulic system suitable for mobile machines which is based on the setup of the conventional hydraulic-mechanic Load-Sensing (hm-LS). In addition to the hm-LS system, the new system possesses an electro-hydraulic (eh) pump swash plate angle controller and a hydraulic-mechanic pressure difference sensor for the measurement of the difference between pump pressure and maximum load pressure. In operating ranges with small swash plate angles the new system is controlled by the hm volume flow controller with the necessary precision. At large volume flow and hence large power demand, the system is controlled by the eh pump controller with an improved energetic and dynamic behaviour. In this contribution the dynamic system transfer behaviour, in particular during a changing pump controller and a comparison of the energetic behaviour between the hm-LS and the system with alternating pump controllers is shown by means of measurements with a test rig.
Alternating pump control for a load-sensing system
2010
12 Seiten, 5 Bilder, 2 Quellen
Conference paper
English
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