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Control strategies of power system in hybrid hydraulic excavator

机译：混合液压挖掘机动力系统的控制策略

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Hybrid system, which has been successfully used in vehicles, is introduced to hydraulic excavators nowadays. The primary focus of this study is to investigate the control strategies of hybrid system used in hydraulic excavators. At first, the structure and working conditions of hybrid hydraulic excavators are analyzed. Based on the analyses, a control strategy named the engine constant-work-point is proposed and studied in a simulative experimental system. Then the control strategy named double-work-point is presented to overcome the limitations of the constant-work-point control strategy. The features and experimental results of the double-work-point control strategy show that the engine's efficiency and the capacitor's state of charge (SOC) cannot be optimized simultaneously. Thus a dynamic-work-point control strategy, which regulates the engine's working point dynamically, is developed to make the system work better. Experimental results show that the dynamic-work-point control strategy can improve the distribution of engine's working points, restrain the capacitor's SOC and has little influence on the performance of the system.
机译：如今，混合动力系统已成功用于车辆，并已引入液压挖掘机。这项研究的主要重点是研究液压挖掘机混合动力系统的控制策略。首先，分析了混合动力液压挖掘机的结构和工作条件。在此基础上，提出了一种发动机恒定工作点控制策略，并在模拟实验系统中进行了研究。然后提出了双工点控制策略，克服了恒工点控制策略的局限性。双工作点控制策略的特性和实验结果表明，无法同时优化发动机的效率和电容器的荷电状态（SOC）。因此，开发了动态工作点控制策略，该策略动态地调节了发动机的工作点，以使系统更好地工作。实验结果表明，动态工作点控制策略可以改善发动机工作点的分布，抑制电容器的SOC，对系统性能的影响很小。

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