基于FPGA的比例电磁阀数字型线性放大器实现方法  

Realization of proportional solenoid valve digital linear amplifier based on FPGA

作　　者：陈洪兴 CHEN Hong-xing(The 715 Research Institute,China State Shipbuilding Corporation Limiteel,Hangzhou 310023,China)

机构地区：[1]中国船舶集团有限公司第七一五研究所,浙江杭州310023

出　　处：《机电工程》2022年第12期1726-1731,共6页Journal of Mechanical & Electrical Engineering

基　　金：国防科技创新特区项目(19-XXX-0X-ZD-006-006-02)。

摘　　要：针对无外置反馈信号比例电磁阀放大器的期望输出与控制输入存在的非线性问题,对各参数在放大器工作中的作用进行了研究,提出了一种预存匹配参数、电流跃变时跟踪不工作的线性放大器实现方法。首先,明确了实现线性放大器需要有效解决的问题;其次,基于上述的问题,采用发明问题解决理论(TRIZ)对现有放大器进行了分析,得到了发明原理解;然后,根据发明原理解将控制值输出电流关系形成逆向匹配参数表,将输出电流采样电流形成匹配参数表,并将匹配表预存入放大器中;最后,在现场可编程门阵列(FPGA)中实现了放大器的控制功能,并针对不同的比例阀,进行了匹配表参数的测定、放大器静态性能的测试以及工程应用验证。研究结果表明:该数字型线性放大器实现方法合理、有效,放大器输入/输出的线性误差小于1.5%,电流稳态建立时间小于0.1 s;通过在液压系统控制中进行工程应用,减小了控制系统的复杂度;控制系统可以与放大器进行实时参数交互,从而便于远程控制。Aiming at the problem of non-linearity between desired output and the input of a proportional solenoid valve amplifier without external feedback signal,the function of each parameter in the operation of the amplifier was studied,and a method to implement a linear amplifier by pre-storing matching parameters and executing no tracking during current jump was proposed.Firstly,the problems that need to be solved effectively in realizing linear amplifier were defined.Secondly,based on those problems,through analysis of the existing amplifiers using TRIZ,the solution of inventive principles was obtained.Then,according to the solution,the control value-output current relationship was formed into an inverse matching table,the output current-sampling current relationship was formed into another matching table,and the two matching tables were pre-stored in the amplifier.Finally,the control functions of the amplifier were realized in field programmable gate array(FPGA),and the measurement of matching parameters,test of static performance of the amplifier,and verification of engineering application were carried out for different proportional valves.The research results show that the implementation of the digital linear amplifier is reasonable and effective,with linear error between the input/output less than 1.5%and the current steady-state establishment time less than 0.1 s.The amplifier can be applied in the hydraulic system,reducing complexity of its control system.The control system can exchange parameters with the amplifier on time,which is convenient for remote control.

关 键 词：比例电磁阀放大器 现场可编程门阵列 液压控制阀 液压远程控制 期望输出 控制输入 

分 类 号：TH134[机械工程—机械制造及自动化]