泵阀双源协同驱动非对称液压缸系统特性

阀控液压系统动态响应快、功率密度大,但存在较大节流损失,无法解决多执行器系统载荷差异带来的节流损失;泵控非对称液压缸系统消除了节流损失,但需进行流量补偿,同时泵控多执行器系统装机功率和成本过高。针对上述问题,提出一种泵阀双源协同驱动非对称液压缸系统,并将其应用于某大型液压挖掘机斗杆系统。首先在SimulationX中构建了机电液联合仿真模型,通过与斗杆空载试验结果对比,验证了模型的准确性,然后设计了系统控制策略,最后通过仿真分析了不同控制系统斗杆运行特性和能耗特性。仿真结果表明,与电液流量匹配控制系统相比,该系统改善了斗杆运行平稳性,同时降低系统能耗达63.3%,并具备能量回收的潜力。

Characteristics of Valve Control and Pump Control Dual Source Cooperative Drive Differential Cylinder System

The valve controlled system has advantages of fast dynamic response and high power density. However, the throttling loss is large, and the throttling loss caused by load difference of multi-actuator system can't be alleviated. The pump-controlled system eliminates throttling loss, but asymmetric flow should be compensated, and the installed power and cost of pump-controlled multi-actuator system are too high. Therefore, a valve control and pump control dual source cooperative drive differential cylinder system is proposed for hydraulic excavator arm. A co-simulation model is built in the SimulationX and its accuracy is verified by test results. Then, the control strategy is designed. The operating characteristics and energy characteristics of different systems are analyzed. The simulation results show that, compared with electro-hydraulic flow matching system, the proposed system improve the running stability of the arm and reduce energy consumption by 63.3%. Meanwhile, the proposed system has the potential of energy recovery.