Diesel-elektrischer Hybridantrieb für kommunale Arbeitsmaschinen

Angepasste Hybridantriebe in mobilen Arbeitsmaschinen (off-highway Anwendungen) versprechen wegen der typischerweise auftretenden Lastzyklen mit ausgeprägten, häufigen und schnellen Laständerungen folgende Vorteile: geringerer Kraftstoffverbrauch, Einsatz eines Dieselmotors kleinerer Leistung, dadurch Erfüllung strikter werdender Emissionsvorschriften (TIER 4, EURO 5) ohne oder mit reduzierter Abgasnachbehandlung, Lärmreduktion, weitere Einsparpotenziale durch Elektrifizierung der Fahrzeugfunktionen möglich (Erhöhung des Hybridisierungsgrads), höhere Produktivität durch höhere Antriebsdynamik.Several duty cycles have been performed with the LADOG multipurpose community vehicle equipped with a conventional diesel engine drive train. Based on these results, simulation calculations have been performed to estimate the fuel savings which can be achieved if this mobile machine would be equipped with a parallel diesel-electric hybrid drive train. Two hybrid configurations were considered, one with the original diesel engine and one with a right-sized, i.e. a smaller diesel engine. Several operation modes of the hybrid were simulated like start-stop function, recuperation, boosting and diesel engine operation for optimized fuel consumption (characteristic mapping). The simulation results showed fuel savings up to 20 % even for this community vehicle which seemed not to be attractive for hybridization. This LADOG vehicle is actually modified by the hybrid drive train substituting the pure diesel drive train. The experimental proof of the simulations is under way

Research Platform: Decentralized Energy System for Sector Coupling

Industrial facilities usually need multiple energy subsystems, e.g., for heat, cold, and electric power supply. Normally, these energy subsystems are controlled locally and independent of each other. Coupling of the different subsystems can open up additional potential. Fraunhofer IISB has developed a demonstration and research platform for investigating the benefits of such sector coupling. A major precondition is to understand the energy flows in the system and establish an overall and flexible system control to realize the required algorithms for setting up an intelligent decentralized energy system. Major components of the overall system are various storages, which extend the degree of freedom for sector coupling and increase the effectiveness of the different subsystems