[Chen_G.R.]_Fuzzy_PID_controllers_for_industrial_a(BookFi.org).pdf

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1、FuzzyPIDControllersforIndustrialApplicationsG.RonChenLectureforEE6452CityUniversityofHongKongSummary·Proportional-Integral-Derivative(PID)controllersarethemostwidelyusedcontrollersinindustriestoday·Statistics:>90%controllersinindustriesarePIDorPID-ty

2、peofcontrollers(therestareprogrammablelogicalcontrollers(PLC))·MeritsofPIDcontrollers:simple,cheap,reliable,andeffective·Forlower-orderlineartime-invariantsystemsandprocesses,PIDcontrollershavegoodset-pointtrackingperformancewithguaranteedstability·F

3、uzzylogicprovidesacertainlevelofartificialintelligencetotheconventionalPIDcontrollers·FuzzyPIDcontrollershaveself-tuningabilityandon-lineadaptationtononlinear,time-varying,anduncertainsystems·FuzzyPIDcontrollersprovideapromisingoptionforindustrialapp

4、licationswithmanydesirablefeaturesOutlineofthePresentation·OverviewoftheFuzzyLogicTechnology·OverviewofConventionalPIDControllers·IntroductiontoFuzzyPIDControllers·SomeSuccessfulExamplesofApplications·ConcludingRemarksOverviewoftheFuzzyLogicTechnolog

5、yClosed-LoopSet-PointTrackingSystemConsiderthetypicalset-pointtrackingsystem:r+euySControllerPlant(reference(error(control(outputsignal)-signal)signal)signal)Figure1Atypicalclosed-loopset-pointtrackingsystemObjective:e(t):=r(t)-y(t)®0(t®¥)Approach:De

6、signafuzzylogiccontroller(FLC)euFuzzificationFuzzyRuleBaseDefuzzificationcontrollercontrollerinputoutputFuzzyLogicController(FLC)Figure2Generalstructureofafuzzylogiccontrollertemperaturebcyt()or=45det()a0tFigure3Temperatureset-pointtrackingexample(i)

7、Ife>0thene=r-y>0orr>ytheoutputyisatpositionaord(ii)Furthermore,ife&<0thene&=r&-y&=0-y&ory&>0(iii)Therefore,theoutputyisatpositionaFuzzyLogicRuleBase:1R:IFe>0ANDe&<0THENu(t+)=u(t)2R:IFe<0ANDe&<0THENu(t+)=-u(t)3R:IFe<0ANDe&>0THENu(t+)=u(t)4R:IFe>0ANDe&

8、>0THENu(t+)=-u(t)FuzzyControllerDesignA.FuzzificationPurpose:EnabletheinputphysicalsignaltousetherulebaseApproach:UsemembershipfunctionsmmPLNL1mm1PSNS..0He,e-H0e,e(a)(b)Figure4Fourmembershipfunctionsforsignalseande&B.ProgrammableRuleBase1+R:IFe=PLAND