Abstract The mismatch between the load and pump sources and the restriction of energy recovery lead to large energy losses and lower energy efficiency in high power multi-actuator hydraulic systems. To obtain high energy efficiency, this paper develops a Multi-Source Network Hydraulic System (MSNHS) with multiple actuators and a corresponding power management strategy (PMS) to reduce the throttling losses and recover energy. The multiple energy-saving power modes based on the path of power transmissions, composed of different combinations of six power units with energy conversion and transfer, are implemented on MSNHS to supply and regenerate or recover power for various load conditions. Thus, the power consumption models of each power unit are established to analyze the power consumption characteristics for itself and power modes. On this basis, the switching supervisory controller is proposed to select an optimal mode for the current condition by utilizing an objective optimized function of minimal power consumption. Besides, the switching rules among power modes are designed, and the logical threshold control is presented for the multi-mode switching under different working conditions. The combination of the switching supervisory controller of optimal mode and the logical threshold control realizes the power management of the MSNHS with multiple actuators to accommodate with time-varying load and recover potential energy. The experimental validation is conducted on the MSNHS platform by simulating a 90° truck-loading cycle of the excavator. Experimental results demonstrate that the PMS applied to the MSNHS can downsize engine input power by up to 60.27% compared with the theoretical calculation of conventional one, and then improve overall system energy efficiency.

中文翻译：

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多执行器多源网络液压系统的电源管理

摘要 大功率多执行器液压系统中，负载源与泵源不匹配，能量回收受限，导致能量损失大，能效低。为了获得高能效，本文开发了一种具有多个执行器和相应电源管理策略 (PMS) 的多源网络液压系统 (MSNHS)，以减少节流损失并回收能量。基于电力传输路径的多种节能电力模式，由六个具有能量转换和传递功能的功率单元的不同组合组成，在MSNHS上实现，为各种负载条件提供和再生或回收电力。从而建立各功率单元的功耗模型，分析自身和功率模式的功耗特性。以这个为基础，建议开关监控控制器通过利用最小功耗的目标优化函数为当前条件选择最佳模式。此外，设计了功率模式间的切换规则，提出了不同工况下多模式切换的逻辑阈值控制。最优模式的切换监控控制器和逻辑阈值控制相结合，实现了多执行器MSNHS的电源管理，以适应时变负载和恢复势能。实验验证是在 MSNHS 平台上通过模拟挖掘机的 90°卡车装载循环进行的。实验结果表明，应用于 MSNHS 的 PMS 可以将发动机输入功率降低多达 60。