多执行器负载敏感系统分流控制的研究

发布时间：2018-02-11 15:49

本文关键词： 负载敏感系统叉车 AMESim 分流控制仿真　出处：《燕山大学》2013年硕士论文　论文类型：学位论文

【摘要】：随着工程机械行业中对节能的要求越来越高，负载敏感系统的应用越来越广，针对单执行器系统而言，负载敏感系统能够圆满的满足其工作要求。然而对于单泵驱动的多执行器负载敏感系统，当多执行器要求同时动作且泵的最大流量不足以提供所有执行器所需流量之和时，普通的负载敏感系统会出现高负载端压力补偿阀不起作用，从而出现高负载联执行器速度降低甚至停止的现象。本文针对这一现象对单泵驱动的多执行器负载敏感系统的分流控制方法进行研究。本课题通过对单泵驱动的多执行器负载敏感系统的不足之处的原因进行分析，对其分流控制原理进行深入研究，得到一种能解决流量不足的新的分流控制方法。并运用于叉车系统中进行验证。以CPCD160内燃平衡叉车为研究对象，首先对该型号叉车工作部分中的各动作进行简单介绍，了解其动作需满足的条件，并基于以上分析对各动作的负载敏感系统进行了设计计算及基本元件的选型。其次，利用AMESim软件建立所设计的负载敏感系统中的各元件的仿真模型。搭建各工作部分液压系统的仿真模型，结合实际工况进行设计计算和仿真参数的设计，并进行了仿真分析，分析仿真所得曲线。再次，针对单泵驱动的多执行器负载敏感系统提出了一种新的分流控制方法。以两执行器系统为例，进行两种情况的仿真分析，并进行对比验证分流控制方法的正确性。把该分流控制方法应用到叉车系统中，，对叉车的不同工况进行仿真分析，验证加入分流控制方法能够满足复合动作的协调性。最后，针对单支路控制系统中的控制器进行了优化。分别采用常规PID和二自由度PID控制对单支路控制系统进行了数学模型的仿真，对仿真结果进行了对比。并把二自由度PID加入带分流控制的两执行器负载敏感系统进行验证。
[Abstract]:With the increasing demand for energy saving in construction machinery industry, the application of load-sensitive system is becoming more and more extensive. The load-sensitive system can satisfy its working requirements satisfactorily. However, for the single-pump driven multi-actuator load-sensitive system, when the multi-actuator requires simultaneous operation and the maximum pump flow is not sufficient to provide the sum of all the actuators' required flow, Ordinary load-sensitive systems have high load end pressure compensation valves that do not work. In this paper, the shunt control method of multi-actuator load sensitive system driven by single pump is studied. Through the analysis of the reasons for the deficiency of the multi-actuator load sensitive system driven by single pump, the principle of shunt control is deeply studied in this paper. A new flow control method is obtained, which is used in forklift system. Taking CPCD160 internal combustion balance forklift as the research object, the operation of the working part of this type forklift is introduced briefly. Based on the above analysis, the load sensitive system of each action is designed and calculated and the basic components are selected. Secondly, the simulation model of the components in the load sensitive system is established by using AMESim software. The simulation model of the hydraulic system is built, and the design calculation and simulation parameters are carried out according to the actual working conditions. The simulation analysis is carried out, and the simulation curve is analyzed. Thirdly, a new shunt control method is proposed for multi-actuator load-sensitive system driven by single pump. Taking two actuators as an example, the simulation analysis of two cases is carried out. The method is applied to the forklift truck system, and the simulation analysis of the different working conditions of the forklift truck is carried out, and it is verified that adding the shunt control method can meet the coordination of the compound action. Finally, the controller of the single branch control system is optimized. The mathematical model of the single branch control system is simulated by conventional PID and two-degree-of-freedom PID control, respectively. The simulation results are compared and the two-degree-of-freedom PID is added to the two-actuator load sensitive system with shunt control for verification.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH242;TP273

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