多路液压功率流耦合匹配系统及其应用研究

发布时间：2018-06-17 20:47

本文选题：液压功率流耦合匹配系统 + 动力参数匹配　；参考：《青岛大学》2014年硕士论文

【摘要】：近年来,作为当今主要能源的石油价格飞涨,能源问题已经直接制约着国际经济的发展。液压挖掘机作为国家基础建设的主要装备,使用范围广,工况复杂,工作循环中负荷剧烈变化,发动机往往工作在低效区,工况恶劣,燃油经济性差,排放差。为了解决这一问题各国都在进行相关提高液压挖掘机效率方面的研究。目前,混合动力技术在汽车领域已得到广泛应用,在工程机械领域,主要针对油电混合动力系统进行研究,蓄电池功率密度小,价格昂贵的缺点直接制约其发展。因此,本文提出了液压功率流耦合匹配系统可最大限度的提高液压系统的能量利用率,大大减少工程机械、机床工业、汽车制造、冶金矿山、航空航天等工业领域以及日常生活等领域的液压系统中的能量转换损失、能量传输损失和能量匹配损失,尽量用最少的能量输入保证所需要的能量输出。本文以液压功率流耦合匹配系统为研究对象,本文的主要研究内容共分为以下五部分： (1)通过分析研究目前液压挖掘机节能现状,以及目前液压分流技术在工程机械领域中应用出现的问题,提出液压功率流耦合匹配系统设计方案,并提出液压功率流耦合匹配系统总体设计目标。 (2)通过对液压功率流耦合匹配系统关键部件特性进行分析,确立了液压功率流耦合匹配系统关键部件参数匹配设计目标,并建立了发动机、双向变量泵／马达、液压蓄能器的具体参数匹配方法,设计选取了液压功率流耦合匹配系统关键部件的具体参数和型号。 (3)通过对液压功率流耦合匹配系统进行结构简化,分析研究发动机,液压蓄能器,双向变量泵／马达的力学特性、流体特性,建立液压功率流耦合匹配系统关键部件之间的数学模型,并在MATLAB/SIMULINK中建立相应仿真模型。 (4)在目前油电混合动力系统广泛使用的单工作点、双工作点等控制策略的基础上,提出适用于液压功率流耦合匹配系统的基于工况定工作点控制策略。通过对控制流程的分析,建立相应的MATLAB/SIMULINK仿真模型。 (5)分别在重载工况、中载工况、轻载工况下验证液压功率流耦合匹配系统能够满足液压挖掘机正常工作循环的动力性要求,并通过与普通液压挖掘机同等工况下燃油量进行比较得出液压功率流耦合匹配系统较普通油液挖掘机节油率在20%以上。液压功率流耦合匹配系统能够满足设计期望的总体设计目标。
[Abstract]:In recent years, as the main energy, the oil price has skyrocketed, the energy problem has directly restricted the development of the international economy. As the main equipment of national infrastructure, hydraulic excavator has a wide range of use, complex working conditions, violent changes of load in the working cycle, and the engine often works in the low efficiency area, the working condition is bad, the fuel economy is poor, and the emission is poor. In order to solve this problem, all countries are carrying out research on improving the efficiency of hydraulic excavators. At present, hybrid power technology has been widely used in the field of automobile. In the field of construction machinery, the research is mainly focused on oil-electric hybrid power system. The low power density of battery and the disadvantages of expensive price directly restrict its development. Therefore, this paper proposes that the hydraulic power flow coupling matching system can maximize the energy utilization rate of the hydraulic system, greatly reduce the construction machinery, machine tool industry, automobile manufacturing, metallurgical mines, The energy conversion loss, energy transfer loss and energy matching loss in hydraulic system in industry such as aerospace and daily life can be guaranteed with minimum energy input. This paper takes the hydraulic power flow coupling matching system as the research object, the main research content of this paper is divided into the following five parts: 1) through the analysis and study of the current energy saving status of hydraulic excavator, As well as the problems existing in the application of hydraulic distributary technology in the field of construction machinery at present, the design scheme of hydraulic power flow coupling matching system is put forward. The overall design goal of the hydraulic power flow coupling matching system is put forward. By analyzing the characteristics of the key components of the hydraulic power flow coupling matching system, this paper analyzes the characteristics of the key components of the hydraulic power flow coupling matching system. The parameter matching design goal of the key components of the hydraulic power flow coupling matching system is established, and the specific parameter matching methods of the engine, bidirectional variable pump / motor and hydraulic accumulator are established. The specific parameters and models of the key components of the hydraulic power flow coupling matching system are selected. By simplifying the structure of the hydraulic power flow coupling matching system, the engine and the hydraulic accumulator are analyzed and studied. The mechanical and fluid characteristics of the bidirectional variable pump / motor, the mathematical model of the key components of the hydraulic power flow coupling matching system is established. The corresponding simulation model is established in MATLAB / Simulink. (4) on the basis of the control strategies such as single working point and double working point, which are widely used in oil-electric hybrid power system at present, A fixed operating point control strategy based on working condition for coupled matching system of hydraulic power flow is proposed. By analyzing the control flow, the corresponding simulation model of MATLAB / Simulink is established. Under the light load condition, it is proved that the coupling matching system of hydraulic power flow can meet the dynamic requirements of the normal working cycle of hydraulic excavator. By comparing with the conventional hydraulic excavator under the same working conditions, the results show that the hydraulic power flow coupling matching system saves more than 20% of the conventional hydraulic excavator. The hydraulic power flow coupling matching system can meet the design goal.
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU621

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