分布式独立二次调压电液控制系统设计与仿真

Design and Research of Distributed Independent Secondary-pressure-regulating Electro-hydraulic Control System

摘要:

通过多路阀实现负载敏感电液控制（LS）系统等集中式液压系统流量分配，会产生较大的节流损失，能量效率较低。分布式独立电液控制系统（DIEHCS）采用单泵单执行器的排量控制方式，基本消除节流损失，节能效果显著，但普遍存在独立式驱动装机功率大、分布式安装结构不紧凑等问题。为此，本文以6 t挖掘机为对象，提出了一种分布式独立二次调压电液控制系统（DIEHCS-SPR）。该系统主要由3个独立布置于臂架上的开式电液执行器（EHA）及1个恒压控制的主泵（布置于舱室内）组成。各EHA根据执行器预期速度和负载力方向实现四象限工况的精确运转。6 t挖掘机虚拟样机仿真结果表明，在同一个工作周期下，提出的DIEHCS-SPR系统相比于LS系统节能率可达42%~46%。相比于现有DIEHCS，所提出系统各EHA峰值输出功率最高可降低70%~74%，可显著减小各EHA外形尺寸和质量，不仅节约了关键元件（EHA）的制造成本，更降低了分布式安装时自重所产生的额外能耗。

Abstract:

Centralized hydraulic systems such as load-sensing electro-hydraulic control (LS) systems realize flow distribution through multiple valves, resulting in large throttling losses and low energy efficiency. The distributed independent electro-hydraulic control system (DIEHCS) adopted the displacement control mode of single pump and single actuator, which basically eliminated throttling loss and had remarkable energy-saving effect, but there were many problems such as large installed power of independent drive and uncompact distributed installation structure. Therefore, a distributed independent secondary-pressure-regulation electro-hydraulic control system (DIEHCS-SPR) was proposed for a 6 t excavator. The system consisted of three open electro-hydraulic actuators (EHAs) which independently arranged on the manipulator and a constant pressure main pump (arranged in the cabin). Each EHA achieved four-quadrant operation according to the expected actuator speed and load direction. The simulation results of 6 t excavator virtual prototype show that proposed DIEHCS-SPR was compared with LS system, the energy saving rate was up to 42%~46% under the same working cycle. Compared with the existing DIEHCS, the proposed system can reduce the peak output power of each EHA by up to 70%~74%, resulting in a significant reduction in individual EHA dimensions and weight, while saving key component (EHA) manufacturing costs and additional energy consumption from self-weight during distributed installation.