Adaptive Control of a Pneumatic Valve Actuator for an Internal Combustion Engine

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1、730IEEETRANSACTIONSONCONTROLSYSTEMSTECHNOLOGY,VOL.19,NO.4,JULY2011AdaptiveControlofaPneumaticValveActuatorforanInternalCombustionEngineJiaMa,GuomingG.Zhu,andHaroldSchockAbstract—Electro-pneumaticvalveactuatorsareusedtoelim-variablecamphasingwithacontinuouslyvariablevalveliftina

2、tethecamshaftsofatraditionalinternalcombustionengine.anddurationactuation.Theyareusedtocontroltheopeningtiming,duration,andliftofAsignificantamountofresearchhasbeenconductedtobothintakeandexhaustvalves.Inordertodevelopmodel-baseddemonstratetheadvantageofvariablevalveactuation(VV

3、A)controlstrategies,acontrolorientedmodelwasdevelopedbypiece-wiselylinearizingthephysics-basednonlinearsystemmodel.Inoverthetraditionalcam-basedvalve-trainofbothgasolineandthispaper,anadaptivevalveliftcontrolstrategywasdevelopeddieselengines.Theinvestigationofintakevalvetimingc

4、ontroltoimprovetheintakevalveliftrepeatability.Themodelreferenceofasparkignited(SI)enginewasconductedin[4].Itwasadaptivesystemidentificationtechniquewasemployedtoestimatefoundthatatlowandpartialloadconditions,enginepumpingsystemparametersneededforgeneratingfeedforwardcontrolsig-

5、losswasreducedbetween20%and80%duetothrottle-lessnalsfortheclosed-loopcontrolscheme.Theclosed-loopliftcon-trolstrategies,alongwiththemodelreferencefeedforwardcon-operation.Fuelconsumptionwasimprovedupto10%atidle.trol,weredevelopedandimplementedinaprototypecontroller,Throughsimul

6、ationandexperiments,[5]showsthatSIengineandvalidatedonavalvetestbenchwithmultiplereferencevalveefficiencycanbeimprovedupto29%duetovariablevalveliftsatboth1200and5000r/minenginespeeds.Theexperimenttiming(VVT),comparedtoaclassic(throttled)engine.Theresultsshowedthattheactualvalvel

7、iftreachedthereferenceliftenginetorqueoutputisalsoimprovedbyupto8%atlowwithin0.5mmoflifterrorinonecycleat1200r/minandintwocy-clesat5000r/min.Themaximumsteady-statelifterrorswerelessspeedwithwideopenthrottle.Researchcarriedoutin[6]than0.4mmathighvalveliftandlessthan1.3mmatlowval

8、velift.demonstratedhowVVTandVVL(variablevalvelift)affe