Abstract Recently, there has been a growing demand for electro-hydraulic systems that can offer both high control performance and high energy efficiency. Traditionally, high performance is achieved using expensive high-bandwidth servo valve-controlled units. However, the inevitable throttling losses that occur in such systems severely decrease their energy efficiency. For a higher energy efficiency, pump-controlled systems have become the standard choice in this field. Nevertheless, their dynamic performance is inferior to that of valve-controlled systems. Considering the individual advantages of the valve- and pump-controlled units, our previous work proposed the idea of a parallel-connected pump–valve-coordinated system. In this study, a generic form of the coordinated control unit is discussed, and further improvements are made to the control design. In addition, comprehensive experimental studies are conducted with a variable-displacement pump and a servo motor-driven pump equipped with a direct pump-control component. Favorable results are obtained, demonstrating that the proposed system can achieve better tracking performance than a typical valve-controlled system, while simultaneously improving the energy efficiency.

中文翻译：

---

改进性能和效率的并联泵阀协调控制单元的开发

摘要 近年来，对能够提供高控制性能和高能效的电液系统的需求不断增长。传统上，高性能是使用昂贵的高带宽伺服阀控制单元来实现的。然而，在此类系统中不可避免的节流损失会严重降低其能源效率。为了获得更高的能效，泵控系统已成为该领域的标准选择。然而，它们的动态性能不如阀控系统。考虑到阀控和泵控单元的各自优势，我们之前的工作提出了并联泵阀协调系统的想法。在这项研究中，讨论了协调控制单元的通用形式，并对控制设计进行了进一步的改进。此外，还对可变排量泵和配备直接泵控制组件的伺服电机驱动泵进行了全面的实验研究。获得了良好的结果，表明所提出的系统可以实现比典型的阀控系统更好的跟踪性能，同时提高能源效率。