多执行器载荷差异储能均衡系统特性

Characteristics of the Multi-actuator Load Difference Balancing System with Energy Storage

针对阀控多执行器复合作业系统节流损失大、动势能浪费严重等问题,提出一种多执行器载荷差异储能均衡原理。首先对多执行器系统功率分配特性进行分析,明确了载荷差异产生节流损失的原因是动力源压力与最大负载相匹配,导致其他执行器控制阀产生过大的压力损失。然后建立了载荷储能均衡液压挖掘机联合仿真模型。并设计电液储能单元控制各执行器进油腔的压力相等,从而消除执行器载荷差异造成的节流损失。在动臂、铲斗同时动作时,与流量匹配系统相比,所提系统节流损失降低达75%,系统效率提升39%;同时,电液储能单元实现了传统压力补偿器的压差调控功能,显著提升了系统运行平稳性。

The valve-controlled multi-actuator systems have problems such as large throttling losses and a serious waste of energy.Therefore,a principle of multi-actuator load difference balancing with energy storage is proposed.The power distribution characteristics are analyzed,and it is identified the reason for throttling losses caused by load difference is that the power source pressure matches the highest load and the other actuators consume the pressure difference in valves.Then,a co-simulation model of the excavator with the proposed system is established.An electro-hydraulic energy storage unit is designed to control the inlet-chamber pressures of each actuator to be equal,so as to eliminate the throttle losses caused by load difference.When the boom and bucket operate simultaneously,the throttling losses of the proposed system are reduced by 75%and the system efficiency is improved by 39%compared with the flow matching system.Meanwhile,the electro-hydraulic energy storage unit realizes the pressure-compensation function and significantly improves the stability.