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With the power of two motors
14.10.2015

Hybrid excavator uses diesel-electric drive

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.

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.

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Downloads

Press release
(1 page, pdf, 70 kB)

Projektinfo
(4 pages, pdf, 1.043 kB)

Downloadable pictures

Note: All downloadable pictures may only be used for coverage relating to this research project.

Minicover
(300 dpi, tiff, 3,8 MB)