第48卷第2期2024年2月doi:10.11832/j.issn.1000-4858.2024.02.010液压与气动ChineseHydraulics&Pneumatics模式切换结合模糊PWM的气动容腔压力控制方法Vol.48No.2February.2024孙国鑫，李帅鹏，虞启辉，张家宝（内蒙古科技大学机械工程学院，内蒙古包头014000）摘要：容腔压力是管路系统的主要控制对象，用高速开关阀代替普遍使用的比例阀进行压力调控，可大幅降低系统成本。针对单腔双阀压力跟踪系统，提出了一种模式切换结合模糊PWM的气动容腔压力控制方法。该方法的目的是减小超调，降低调节时间，提高压力跟踪性能。首先由模糊控制器根据偏差给出占空比指令，然后通过引入PWM将开关量转换为连续量调节，进而通过快速切换开关阀的工作模式实现容腔内压力的精细化调节。仿真结果表明：阶跃响应的超调量小于0.6%，峰值时间0.15s，调节时间0.16s，同时能够很好的跟踪上0.5Hz的谐波信号，与当前控制策略相比，超调量和调节时间均有明显的降低。关键词：模式切换；模糊PWM；压力控制；高速开关阀中图分类号：TH138文献标志码：B文章编号：1000-4858(2024)02-0078-07PneumaticCavityPressureControlUsingModeSwitchingCombinedwithFuzzyPWMSUNGuo-xin,LIShuai-peng,YUQi-hui,ZHANGJia-bao(SchoolofMechanicalEngineering,InnerMongoliaUniversityofScienceandTechnology,Baotou,InnerMongolia014000)Abstract:Thepressureofthecapacitivechamberisthemaincontrolobjectofthepipingsystem,andreplacingthecommonlyusedproportionalvalvewithahigh-speedswitchingvalveforpressureregulationcansignificantlyreducethesystemcost.ApneumaticcapacitorcavitypressurecontrolmethodwithmodeswitchingcombinedwithfuzzyPWMisproposedforasingle-cavity,two-valvepressuretrackingsystem.Thepurposeofthismethodistoreduceovershoot,decreaseregulationtimeandimprovepressuretrackingperformance.Firstly,thefuzzycontrollergivesthedutycyclecommandaccordingtothedeviation,andthenconvertstheswitchingquantitytocontinuousquantityregulationbyintroducingPWM,andthenrealizesthefineregulationofpressureinthecapacitorcavitybyquicklyswitchingtheoperatingmodeoftheswitchingvalve.Thesimulationresultsshowthattheovershootofthestepresponseislessthan0.6%,thepeaktimeis0.15s,andtheregulationtimeis0.16s.Meanwhile,theharmonicsignalat0.5Hziswe...
