摘要
滑靴式径向柱塞变量泵是一种新型结构的液压泵，是德国Bosch公司在20世纪80年代研制成功的产品。它具有寿命长、噪音低、工作压力高、调节操作力小、吸油性能好、转速高、可采用特殊油液及多泵组合等优点。可实现恒压、恒流、负载敏感控制的电液比例控制径向柱塞变量泵，具有电子技术和液压技术在不同方面的共同优势。
我国在20世纪90年代开始自行开发研制径向柱塞变量泵，我的导师对已有的伺服变量泵的变量机构在结构上做了修改，本文将对修改后的变量机构的各项参数进行计算，并设计了直动式比例减压阀对径向柱塞变量泵进行比例排量控制，最后用MATLAB进行了仿真和分析。
本文采用古典的频域方法，对系统参数进行线性化处理。虽然用频域的方法分析有着不可克服的局限性而且和实际情况会有很大的出入，但此法在分析电液比例系统时还是很有效的。同时采用Matlab软件计算机实时仿真的方法，即用simulink软件包来实现对系统的仿真，此法具有流程直观、参数修改简便等诸多优点。
针对电液比例控制径向柱塞变量泵研究的现状，本文主要做了如下两个方面的工作：
(1) 本文研究了电液比例排量控制柱塞泵各组成环节的结构和参数，建立了它们的数学模型，并应用MATLAB／Simulink进行了动态分析。
(2)结合当前先进的控制策略，针对电液比例排量变量泵，设计了自适应模糊PID控制器，并通过计算机仿真了系统阶跃信号的系统响应。
仿真结果表明，基于自适应模糊PID控制器的电液比例排量变量泵具有良好的动态性能。
The radial piston pump with boot slider is a kind of new type hydraulic pump, which is developed by Germany Bosch CO. in 1980s and have lots of advantages, such as long life, low noises, high pressure, facile manipulate, high performance of oil-suction, high rotate speed, using special oil easily, multi-pump combination and so on. Electro-hydraulic proportional controlling radial piston pump, which can achieve constant pressure, constant flow and sensitive-load performance and has the advantages of both electronic technology and hydraulic technology.
In 1990s, radial piston pump starts to be developed in China. My tutor ameliorated the structure of hydraulic servo controlling radial piston pump in existence. In this paper, their parameters have been calculated and directional proportional pressure reducing valve is designed which can proportionally control the discharge of radial piston pump. At last the simulation with MATLAB and analysis is made.
In this paper, the means of frequency-domain analysis is adopted to linearize the system's parameters. Although there is limitation, which can't be overcome in the method and the simulation result is quiet different with the fact, but the method is very effective to analyze electro-hydraulic proportional system. At same time, using the MATLAB software, concrete noun-SIMULINK, makes computer's real time simulation. This method has lots of advantages, such as intuitionistic flow, changing parameter easy and so on.
By the actuality of electro-hydraulic proportional controlling radial piston pump, some research efforts as follows are practiced:
(1) In this paper, the structure and the parameters of each element of the electro-hydraulic proportional controlling radial piston pump are studied. The mathematical model is set up and simulated with MATLAB/Simulink.
(2) Based advanced controlling strategy now, self-adapting fuzzy PID controller is designed. Simulated with MATLAB/Simulink, system responses tracking step signal are reproduced.
Simulation results show that the dynamic characteristic of electro-hydraulic proportion controlling radial piston pump using this self-adapting fuzzy PID controller is very good.
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