Hydraulic Hybrid Architecture for Excavators
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Most excavator drivetrain architectures continue to be based on the interaction between the hydraulics and engine. A comprehensive analysis of the loss mechanisms provides new ways to optimise the energy efficiency and performance. Within the scope of a publically fundend project, the IFAS at the RWTH Aachen University has spent the last three years developing a hydraulic hybrid architecture for excavators. The system has been implemented in an 18 t wheeled excavator and recently validated in field tests.
Due to the wide range of applications excavators are used in a number of different system configurations exists. Each has seen its own special evolution depending on the users’ needs and applications’ demand. Among others these include precision control, robust components and systems, low costs and of course energy efficiency. Depending on the machine class and the daily tasks, the importance of each of these requirements changes. As a result, manufacturers offer a...
KeywordsFuel Consumption Engine Speed Supply Pressure Prototype Machine Optimal Fuel Consumption
The validation of the Steam system is funded by the Federal Ministry of Education and Research (BMBF) within the program Validation of the Innovation Potential of Scientific Research (VIP). The authors thank the BMBF for funding. Finally, thanks goes to Volvo Construction Equipment, especially to Ulrich Faß and Heiko Steinbach, for not only providing the test excavator but also for their valuable input and support throughout the project.
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