电-液双源混驱装载机举升系统特性研究

Research on the Characteristics of Wheel Loader Boom Driven by the Electric Hydraulic Hybrid Drive System

装载机广泛应用于工程建设、抢险救灾等关乎国计民生的领域。普遍采用液压系统驱动与传递动力,但系统能量效率较低,且在装卸货物的过程中存在大量势能浪费,增加了整机燃油消耗和碳排放量。针对上述问题,提出电-液双源混合驱动系统,将电机械执行器的高能效与液压缸-蓄能器高势能回收效率的优势相融合,采用高能效电机械执行器控制系统运动,液压缸-蓄能器平衡系统外负载力并回收利用系统重力势能。文中根据所提电-液混驱系统工作原理,对系统进行了理论分析,进一步搭建了所提系统试验测试平台,对系统的电液功率配比进行了优选,明确了系统的工作与能耗特性。试验结果表明,与原有阀控系统相比,相同工况下所提系统可降低能耗51.7%,峰值功率59.6%。研究成果对工程机械领域“双碳”战略愿景目标的实现具有积极促进作用。

Wheel loaders are widely used in construction,rescue,disaster relief,and other areas that affect the people's livelihood.Hydraulic system is commonly used to drive and transmit power,but the energy efficiency of the system is low.Moreover,there is a lot of gravitational potential energy wasted in the process of loading and unloading cargo,which increases the fuel consumption and carbon emissions of the whole machine.To address the above problems,the high energy efficiency of electro-mechanical actuator and the high energy recovery efficiency of hydraulic cylinder-accumulator is integrated,and an electro-hydraulic dual-source hybrid driven system is proposed,which uses electro-mechanical actuator to control the system motion and hydraulic cylinder-accumulator to balance the external load force of the system and recover the gravitational potential energy of the system.According to the working principle of the electro-hydraulic dual-source hybrid driven system,the system is analyzed theoretically;The test platform of the proposed system is further built,the power ratio of the electro-hydraulic hybrid drive system is optimized,and the working and energy consumption characteristics of the system are clarified.The test results show that compared with the original valve-controlled system,the proposed system can reduce energy consumption by 51.7%and peak power by 59.6%under the same working conditions.The research results have a positive effect on the realization of the visionary goal of"double carbon"strategy in the field of construction machinery.