Abstract
A novel energy regeneration swing system is proposed for hydraulic excavator in this paper to reduce the energy consumption. Two independent accumulators are proposed for use in the hybrid swing system. The combined control of hydraulic motor displacement and flow control valve and a variable accumulator control strategy were proposed to improve the energy regeneration efficiency and ensure the system performance. A testbench was set up, and experiments were conducted. The experiment verified that the energy regeneration efficiency of the proposed system ranged from 23 to 56% in different conditions.
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