起重机泵阀协同复合控制液压系统能效特性分析

来源期刊:中南大学学报(自然科学版)2021年第2期

论文作者:杨敬 都佳 肖刚 权龙

文章页码:389 - 400

关键词:工程机械;液压系统;抗流量饱和;泵阀协同;电子压力补偿;AMESim仿真模型;能效特性

Key words:construction machinery; hydraulic system; flow-saturated resistant; pump-valve coordination; electronic pressure compensation; AMESim simulation model; energy efficiency analysis

摘    要:建立以电子压力补偿原理为基础的起重机泵阀协同复合控制液压系统。首先,对起重机典型负载原理进行分析,提出一种以手柄开度信号为阈值的多模式控制策略,即在快速运动模式中采用主阀阀口全开,通过控制电液比例泵斜盘摆角控制进入执行器流量,在微动模式中实时控制主阀阀口开度及电液比例泵斜盘摆角,通过阀芯位置、压力的闭环控制实现流量精准匹配。其次,采用AMESim软件,建立传统抗流量饱和负载敏感液压系统仿真模型,并通过试验验证仿真模型的准确性。最后,建立起重机泵阀协同复合控制液压系统AMESim仿真模型。研究结果表明,与传统抗流量饱和负载敏感液压系统相比,泵阀协同复合控制液压系统在变幅联单动作微动模式下系统能耗降低约2.74%,变幅联单动作快速运动模式下系统能耗降低约9.23%,变幅联和卷扬联复合运动模式下系统能耗降低约10.60%。

Abstract: A pump-valve coordinated composite control hydraulic system(PVCS) based on the principle of electronic pressure compensation was established. Firstly, the typical load principle of cranes was analyzed, and a multi-mode control strategy with the handle opening signal as a threshold was proposed. In the rapid motion mode, the main valve was fully opened, and the flow rate into the actuator was controlled by controlling the displacement of the electro-hydraulic proportional pump. In the micro-motion mode, the opening of the main valve port and the displacement of the electro-hydraulic proportional pump were controlled in real time. The accurate flow matching was achieved through the closed-loop control of the spool position and pressure. Secondly, the AMESim simulation model of the LSHS was established and the accurateness of the simulation model was verified by experiments. Finally, the AMESim simulation model of the PVCS was established. The results show that compared with the LSHS, the PVCS reduces the system power consumption by about 2.74% in the single-action micro-motion mode. The system power consumption is reduced by about 9.23% in the single-action rapid motion mode with lifting cylinder, and the system power consumption is reduced by about 10.60% in the combined motion mode of the lifting cylinder and winch motor.

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