Design Guideline and Investigation of Accumulator Parameters for a Novel Hybrid Architecture

抄録

In order to enhance energy efficiency of excavators for global environment conservation, an Open Center System (OC-System) as a power source has been improved in the world. However, total system efficiency including the internal combustion engine (ICE) has not been thoroughly considered. On the other hand, a Constant Pressure System (CP-System) enabling the engine to be driven optimally is developed but is not accepted in the industry due to the complexity of the required components. Thus, in this research, a hybrid system combining an OC-System with a CP-System is proposed by using a proposed design guideline and analyzing measurement data of a dig and dump cycle. It is indispensable to consider the nominal gas volume and pressure level for an accumulator in terms of energy saving and initial cost. Therefore, the influences of accumulator volume and pressure level are also discussed in this paper.