低动作次数高速开关阀气动系统自适应变频PWM控制算法  

Adaptive Variable-frequency PWM Control Algorithm for Low Action Count High-speed On-off Valve Pneumatic System

作　　者：孙国鑫 李帅鹏 虞启辉[1] 夏龙飞 张家宝 SUN Guoxin;LI Shuaipeng;YU Qihui;XIA Longfei;ZHANG Jiabao(School of Mechanical Engineering,Inner Mongolia University of Science and Technology,Baotou,Inner Mongolia 014000)

机构地区：[1]内蒙古科技大学机械工程学院,内蒙古包头014000

出　　处：《液压与气动》2024年第12期39-45,共7页Chinese Hydraulics & Pneumatics

基　　金：国家自然科学基金(52465008);内蒙古自治区自然科学基金面上项目(2022LHMS05023)。

摘　　要：单腔双阀气动压力伺服系统具有响应速度快、可靠性高、成本低的特点,在汽车制动和气动夹紧装置的压力稳定等领域有着重要应用。为了在满足控制要求的前提下减少开关次数,延长使用寿命,提出了一种自适应变频PWM控制策略。引入了频率调控因子并设计了自适应频率调整函数,该函数可根据跟踪误差及其变化率给出最优PWM基础频率,实现系统跟踪误差较大时低频响应,跟踪误差较小时高频精确运行,从而减少了高速开关阀的开关次数。实验结果表明,变频PWM策略与传统定频PWM相比,阶跃信号进气阀开关次数降低了45%,谐波信号进气阀开关次数降低了23%。The single-chamber,two-valve pneumatic pressure servo system features fast response,high reliability,and low cost,and has important applications in areas such as pressure stabilization of automotive brakes and pneumatic clamping devices.To reduce the number of switching times and prolong the service life under the premise of meeting the control requirements,an adaptive variable-frequency PWM control strategy is proposed.A frequency regulation factor is introduced to design an adaptive frequency adjustment function,which can give the optimal PWM base frequency according to the tracking error and its rate of change size to achieve a low-frequency response when the system has a large tracking error,and high-frequency accurate operation when the tracking error is small,thus reducing the number of switching times of high-speed on-off valve.The experimental results show that the variable-frequency PWM strategy minimizes the number of inlet valve switching times by 45%for the step signal and 23%for the harmonic signal compared with the traditional fixed-frequency PWM.

关 键 词：气动压力控制 高速开关阀 伺服系统 变频PWM 

分 类 号：TH138[机械工程—机械制造及自动化]