Hybrid drives also promise benefits in utility vehicles and construction machinery. Such devices are still, however, very much the exception in the market.
The new BINE Projektinfo brochure “Hybrid building machinery” (11/2015) presents a material handler with a diesel-electric drive. In order to supply the electric motor with electricity, part of the kinetic energy is converted via a generator into electricity and then stored in supercapacitors.
These and further optimisation measures enable the excavator to consume up to 40% less diesel while providing additional power reserves for special loads.
With the power of two motors
The rotary movements of the material handler’s upper superstructure, the house, are achieved via the electric motor’s drive and the energy released during braking is converted back into electricity. A generator flange-mounted to the 160-kW diesel engine charges the supercapacitors – the supercap pack.
The generator reverses its function as required, operating as a motor and supporting the diesel drive during peak loads. The supercap pack enables the two-way feeding and generation of electricity.
In contrast to lithium-ion batteries, which are used in cars, supercaps have the advantage that they have an extremely large number of cycles and a high charge and discharge efficiency.
With the test material handler, the interaction of the diesel engine, motor generator, energy storage system and the hybrid drive in the house was successful.
Another aspect of the research project was to optimise the auxiliary units. Demand-based configuration of the fans, pumps and alternator, as well as an adapted control system, enables up to 9% of the energy to be saved compared with standard units. The hybrid excavator is being developed as a joint project by Deutz AG, Robert-Bosch GmbH and Terex Deutschland GmbH.
The BINE-Projektinfo brochure “Hybrid building machinery” (11/2015) follow this link:
Uwe Milles/Birgit Schneider
About BINE Information Service
Energy research for practical applications
The BINE Information Service reports on energy research topics, such as new materials, systems and components, as well as innovative concepts and methods. The knowledge gained is incorporated into the implementation of new technologies in practice, because first-rate information provides a basis for pioneering decisions, whether in the planning of energy-optimised buildings, increasing the efficiency of industrial processes, or integrating renewable energy sources into existing systems.
About FIZ Karlsruhe
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http://www.bine.info/en - BINE Informationsdienst
Rüdiger Mack | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH
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