Study on energy efficiency characteristics of the heavy-duty manipulator driven by electro-hydraulic hybrid active-passive system

Abstract Multi-joint heavy-duty manipulators, such as working devices of hydraulic excavators, are mostly driven by hydraulic cylinders. Poor energy efficiency of the hydraulic system results in serious energy waste. In this paper, a novel electro-hydraulic hybrid driving (EHHD) system consisting of an electrically active driving system and a hydraulically passive driving system is presented to cope with the special operating characteristics of the heavy-duty manipulator. In the research, a co-simulation model of the proposed system is established, and the key parameters are designed through simulation. On the basis, a test prototype was established to verify the effectiveness and energy efficiency of the proposed system. The results prove that, compared with the popular load-sensing system, the energy consumption in one cycle of boom lifting and lowering process is reduced by 70%.

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