泵阀并联进出口独立系统特性

为结合阀控系统响应快和泵控系统能效高的优点，并减少传统四边联动阀带来的节流损失，提出一种泵阀并联进出口独立控制系统方案，应用于某6 t液压挖掘机动臂及斗杆系统。建立多学科联合仿真模型，设计泵阀协同驱动控制策略，研究了阀控单元与泵控单元输出功率比对系统特性的影响，并应用泵控单元消除了多执行器载荷差异带来的节流损失，对比分析传统进出口独立控制系统与所提系统的运行特性和能耗特性。仿真结果表明，增大阀控单元输出功率占比，可提高系统动态响应；增大泵控单元输出功率占比，可有效减少系统能耗。与传统进出口独立控制系统相比，该系统可减小节流损失90%,降低系统能耗41%,并改善重载执行器响应滞后现象。

Characteristics of Pump-valve Parallel Separate Meter In and Meter Out System

Combining fast response of valve control and high energy efficiency of pump control, and reducing throttling loss caused by four-side linkage valves, the pump-valve parallel separate meter in and meter out system scheme is proposed for 6 t hydraulic excavator boom and arm. The simulation model and the control strategy of pump-valve coordination is designed. The influence of output power ratio of valve and pump is studied, and the pump unit is applied to eliminate throttling loss caused by multi-actuator load difference. The operating characteristics and energy consumption characteristics of the separate meter in and meter out system and the proposed system are compared and analyzed. Results show that, increasing valve output power ratio improves dynamic response, and increasing pump output power ratio reduces energy consumption. The system can reduce throttling loss by 90%, reduce energy consumption by 41%, and improve the response lag of the heavy-load actuator.