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The variable-speed electrohydraulic system has been widely employed in industry for its energy-saving performance. But its poor response and low accuracy, which were caused by the big inertias of electric motor and hydraulic pump, limit its further applications. Working on these disadvantages, the power assist unit (PAU)-based variable-speed drive principle system was proposed. Besides the primary power source driven by variable-speed pump, the PAU acts as an auxiliary power source, which candoi:10.1007/s40430-017-0917-3 fatcat:oeie6sojtna4xjaoarw6bfcqiq