A new hydraulic hybrid excavator driving system was proposed concerning on the issues that the loss of energy was too large and the energy recovery efficiency was not high enough. The driving system used complex cylinders and accumulators to recover the potential energy of mechanical arms and load of the excavator. The complex cylinders were composed by three chambers, including chamber with pistonrod, chamber without pistonrod and counterweight chamber. The counterweight chambers were connected to accumulators, which provide average load force. The chambers with and without pistonrod were connected to entrance and outlet of the pump/motors, respectively, forming pump control systems. The hydraulic pump/motors charged chambers with pistonrod or chambers without pistonrod to drive the action of mechanical arms. The energy conservation effect was verified by simulation. The mathematical model was established to analysis the control performance, the dynamic and static relations among hydraulic components and the energy loss of the system. In addition, the energy management strategy based on instantaneous optimal control strategies was proposed. According to the simulation result and the analysis of mathematical model, the energy recovery efficiency of the mechanical arm is improved and the energy loss is reduced. The maximum output power of the engine can be reduced by 27%, and can be further reduced by 44% using energy management strategy.
ZHAO Peng yu, CHEN Ying long, ZHOU Hua, YANG Hua yong. Potential energy recovery and energy management strategy of hydraulic hybrid excavator. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(5): 893-901.
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