数字式径向柱塞变量泵的恒功率控制研究

【作者】 张玮；

【导师】 那成烈； 张远深；

【作者基本信息】 兰州理工大学 ， 机械电子工程， 2004， 硕士

【摘要】 径向柱塞变量泵可以采用手动控制、电液比例控制或负载敏感控制等多种控制方式，实现恒流量、恒压力、恒功率的控制。本文是以JBP—63型径向柱塞变量泵为研究对象，利用单片机通过脉宽调制(PMW)高速电磁阀开关，通过对径向柱塞变量泵的变量机构调节，来改进这种变量泵控制方式的尝试，以达到恒功率控制的目的。 由高速开关阀控制数字径向柱塞变量泵的液压回路是一种高效节能的新型液压系统，它在各种节能回路中具有最佳的节能效果。而且这种数字泵也具有很多优点，如它的抗污染能力强、重复性好；与计算机接口方便；价格低廉；同时由它所组成的系统不需要像模拟机那样的D／A转换环节；摩擦力、非线性和滞后现象对数字控制系统的影响比模拟系统小。因而它是一种很有前途的流控元件。 本文的主要内容包括：设计了以8031单片机为核心的硬件电路，主要包括高速开关阀驱动电路、采样电路、A／D转换电路、显示器电路等；根据其工作原理建立了系统的动态数学模型；应用MATLAB／Simulink进行了动态分析；即通过改变基泵参数的速度放大系数K_v，得到了系统的仿真曲线族，又经仿真分析得到了K_v对系统动态响应的影响规律，进而得出了数字电液径向柱塞泵控制系统等效于惯性环节的结论。更多还原

【Abstract】 The radial piston pump can adopt manual-control or electro-hydraulic proportional control to realize the control of constant flow, constant pressure, constant power and load sensitivity etc. This paper is a new attempt at the control mode of the radial piston pump. With the study of the JBP-63 radial piston pump and using microcomputer and high-speed-on/off-valve, regulate the machine of the radial piston pump, constant power control can be achieved.Digital-Pump hydraulic circuit controlled by high-speed-on/off-valve is a new hydraulic system of high efficiency. It has the highest efficiency and the greatest energy sources saving among all kinds of circuits. The digital-pump is a promising hydraulic control component because it has many excellences such as good protection from pollution, good repetition, less effect by friction non-linearity and lag than analog system, convenient connection to the computer and no need the D/A conversion as analog machine.The main contents of this paper include: Design the hardware circuit with the core of the 8031 single-chip microcomputer, mainly including the drive circuit of high-speed-on/off-valve, sampling circuit, A/D conversion circuit, display circuit; establish the static and dynamic mathematics model of the system based on the system principle; through simulating software-MATLAB/simulink, get the static and dynamic response curves of the Digital-Pump under constant power; get the flux simulation curves through changing the parameter of the Kv; and find out the law of how the pump’s structure parameter of the Kv to influence the system’s dynamic response through analysis of the simulated curves; educe the conclusion that hydraulic controlled power match radial-piston-pump system is equivalent to the vibration characteristic and digital-axial-piston-pump system is equivalent to the inertia characteristic compared with the reference.更多还原