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URN: urn:nbn:de:swb:90-305393

Deterministic Control Strategy for a Hybrid Hydraulic System with Intermediate Pressure Line

Dengler, Peter; Geimer, Marcus; Dombrowski, René von

Abstract:
The paper introduces a new hydraulic system for mobile machines based on a constant pressure system with the aim to increase the efficiency of actuation of hydraulic cylinders. Using a third pressure level located between high pressure and tank pressure called intermediate pressure the system enables additional pressure potentials from high pressure to intermediate pressure and from intermediate pressure to tank pressure. This reduces throttle losses at hydraulic cylinders when driven at low or medium loads. An accumulator connected to the intermediate pressure line is being charged or discharged in function of which pressure potential is currently used.

Due to the discrete pressure potentials of the system a control strategy is required which reduces throttle losses at the proportional valves and allows maximum recuperation of potential energy. Best results can be obtained if the future loads on the cylinders are predictable. For this reason a Model Predictive Control (MPC) was developed for a wheel loader which was used as a reference system. By using its specific geometric properties the MPC allows a precise load prediction a ... mehr


Zugehörige Institution(en) am KIT Institut für Fahrzeugtechnik und Mobile Arbeitsmaschinen (IFFMA)
Publikationstyp Proceedingsbeitrag
Jahr 2012
Sprache Englisch
Identifikator KITopen ID: 1000030539
Erschienen in Bath/ASME Symposium on Fluid Power & Motion Control (FPMC 2012), 12 - 14 September 2012, Bath, UK
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