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Future wheeled excavator - higher efficiency by electrification
This study shows that electric propulsion is supposed to be an attractive alternative to hydraulic solutions for wheeled excavators. These results might also be of interest for other types of mobile working machines. The main advantages for saving energy are the increased efficiencies during partial loads for both, power transmission and conversion. Even the relatively simple substitution of the hydraulic motor by an electric one has a lot of potential. The increased efficiency due to the electric propulsion system is only a part of the potentials to save energy in the overall system "wheeled excavator". Providing the electric energy can be realized in many thinkable ways, like fuel cells or batteries. As mentioned above, the most obvious solution today is to support the overall system with electric energy by a combination of combustion engine and generator. This series hybrid system leads to the opportunity to decouple the combustion engine from the systems power demand. Installing electric energy storage like batteries or capacitors can help to avoid quick load changes on the combustion engine and to smooth its dynamic behavior. To ensure high dynamics during a rapid rise of the load, electric boosting from the additional storage is possible. On the one hand this leads to improved emissions and on the other hand the most efficient operation point for the combustion engine can be chosen. Additionally, downsizing the engine is thinkable and supplying the overall system with electric energy also enables to run the auxiliary units on demand. For the working attachments and the swing motor, electric supplied solutions offer further potentials to save and recover energy. In order to use this potential, a change of paradigm is necessary. Installing electric power transmission and supplying electric energy is the first step. Consequently, the other functions are also driven with electricity, for example hydraulic pumps for the working attachments. Increasing fuel costs and stricter regulations may help to improve the customer acceptance for these new technologies. Aspects like durability and maintainability are not covered in this study but they have to be kept in mind as important factors, when talking about costumer acceptance.
Future wheeled excavator - higher efficiency by electrification
This study shows that electric propulsion is supposed to be an attractive alternative to hydraulic solutions for wheeled excavators. These results might also be of interest for other types of mobile working machines. The main advantages for saving energy are the increased efficiencies during partial loads for both, power transmission and conversion. Even the relatively simple substitution of the hydraulic motor by an electric one has a lot of potential. The increased efficiency due to the electric propulsion system is only a part of the potentials to save energy in the overall system "wheeled excavator". Providing the electric energy can be realized in many thinkable ways, like fuel cells or batteries. As mentioned above, the most obvious solution today is to support the overall system with electric energy by a combination of combustion engine and generator. This series hybrid system leads to the opportunity to decouple the combustion engine from the systems power demand. Installing electric energy storage like batteries or capacitors can help to avoid quick load changes on the combustion engine and to smooth its dynamic behavior. To ensure high dynamics during a rapid rise of the load, electric boosting from the additional storage is possible. On the one hand this leads to improved emissions and on the other hand the most efficient operation point for the combustion engine can be chosen. Additionally, downsizing the engine is thinkable and supplying the overall system with electric energy also enables to run the auxiliary units on demand. For the working attachments and the swing motor, electric supplied solutions offer further potentials to save and recover energy. In order to use this potential, a change of paradigm is necessary. Installing electric power transmission and supplying electric energy is the first step. Consequently, the other functions are also driven with electricity, for example hydraulic pumps for the working attachments. Increasing fuel costs and stricter regulations may help to improve the customer acceptance for these new technologies. Aspects like durability and maintainability are not covered in this study but they have to be kept in mind as important factors, when talking about costumer acceptance.
Future wheeled excavator - higher efficiency by electrification
Pick, Sebastian (author) / Müller, Steffen (author) / Bach, Peter (author) / Faß, Ulrich (author)
2012
18 Seiten, 14 Bilder, 12 Quellen
Conference paper
English
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