摘要
针对传统阀控挖掘机存在的节流损失大、效率低,以及传统变转速泵控系统能量转化路径长、回收效率低和装机功率大的问题,提出一种非对称双泵控非对称缸的双蓄能器液电混合能量回收系统,以实现不同工况下挖掘机的实时功率匹配,提高系统能量回收效率,并降低系统能耗与装机功率。设计基于四象限工况识别的多模式切换控制策略:系统根据动臂液压缸运行速度与两腔压力判断工作模式(能量回收、能量再利用、普通模式),并在能量回收/再利用模式下,进一步依据系统负载压力与蓄能器压力的比较,切换高压或低压蓄能器参与工作,以实现最优功率匹配。为验证系统性能,建立60 kN挖掘机动臂系统的数学模型,并在AMESim仿真平台中搭建系统仿真模型,对传统分布式系统、单蓄能器系统及双蓄能器系统进行对比仿真分析。结果表明:传统分布式系统能量回收效率为56%,单蓄能器系统能量回收效率为72%,双蓄能器系统能量回收效率最高,为77%;采用双蓄能器的液电混合能量回收系统,相比于传统变转速泵控系统峰值功率降低了33.3%,相对于单蓄能器系统峰值功率降低了16%。
Aiming at the problems of large throttling loss and low efficiency in traditional valve-controlled excavators,as well as the long energy conversion path,low recovery efficiency and large installed power in traditional variable-speed pump-controlled systems,a dual accumulator hybrid hydraulic-electric energy recovery system with an asymmetric double-pump controlled asymmetric cylinder was proposed to achieve real-time power matching of excavators under different working conditions,improve the energy recovery efficiency of the system,and reduce system energy consumption and installed power.A multi-mode switching control strategy based on four-quadrant working condition recognition was designed:the working mode(energy recovery,energy reuse,and normal mode)was determined based on the operating speed of the boom cylinder and the pressure in the two chambers.Under energy recovery/reuse modes,the high-pressure or low-pressure accumulator was selectively engaged according to the comparison between the system load pressure and accumulator pressure,so as to achieve optimal power matching.To verify the performance of the system,a mathematical model of the 60 kN excavator boom system was established,and a system simulation model was built in the AMESim simulation platform.Comparative simulation analysis was conducted on the traditional distributed system,single accumulator system and dual accumulator system.The results show that the energy recovery efficiency of the traditional distributed system is 56%,that of the single accumulator system is 72%,and that of the dual accumulator system is the highest,reaching 77%.The peak power of the hybrid electro-hydraulic energy recovery system with dual accumulators is reduced by 33.3%compared with the traditional variable-speed pump-controlled system,and by 16%compared with the single accumulator system.
作者
刘保生
程敏
李冬明
LIU Baosheng;CHENG Min;LI Dongming(State Key Laboratory of Mechanical Transmission for Advanced Equipment,Chongqing University,Chongqing 400044,China;Jiangsu Hengli Hydraulic Co.,Ltd.,Changzhou Jiangsu 213164,China)
出处
《机床与液压》
北大核心
2025年第23期35-43,共9页
Machine Tool & Hydraulics
基金
国家自然科学基金项目(52322503)
重庆市自然科学基金项目(2024NSCQ-JQX0123)。
关键词
液压挖掘机
泵控系统
能量回收
液压蓄能器
节能
hydraulic excavator
pump control system
energy recovery
hydraulic accumulator
energy conservation
