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1、中北大学2012届毕业设计英语翻译某轿车动力装置参数的匹配设计英文翻译毕业论文1.IntroductionAutomaticandcontinuouslyvariabletransmissionsystemshavebeenexpandingtheirpresenceinpassengervehiclesinrecentyears,whichhasnaturallypromptedactiveresearchonvehiclepowertransmissioncontrolsystems.Themaintopicsincludeshiftcontrolalgorithm(Sh
2、in,Hahn,Yi,&Lee,2000a;Zheng,Srinivasan,&Rizzoni,1999;Shin,Hahn,&Lee,2000b),feedbackcontroloftorqueconverterclutchslipsystems(Jauch,1999;Hibino,Osawa,Yamada,Kono,&Tanaka,1996;Hahn&Lee,2000),newhydrauliccircuitsforcontrolperformanceenhancement(Jung,Cho,&Lee,2000),etc.Despitetheextensiveresear
3、cheffortoncontrolalgorithms,itappearsthatthepressureinformationofahydraulicactuatorhasnotbeenfullyutilizedinvehiclepowertransmissioncontrol,largelyduetothehighcostofapressuresensor.Asaresult,mostpracticalcontrollershavebeenlargelybuiltuponthemechanicalsubsystemonly,whileneglectingthedynamic
4、sofahydraulicactuator.Insteadofdirectlymeasuringthepressureoutputofahydraulicactuator,thispaperproposesanindirectalternativetoestimatethepressureoutput:anobserver-basedapproach.Themainthrustofthispaperisthatthepressureoutputofahydraulicactuatoris‘observable’withtheslipvelocitymeasurementoft
5、hemechanicalsubsysteminavehiclepowertransmissioncontrolsystem.Inadditiontothereadilyavailableslipvelocitymeasurement,theobserverdesignrequiresthemodelsofhydraulicandmechanicalsubsystemswhoseaccuracydirectlyimpactstheobserverperformance.Themechanicalsubsystemisphysicallymodeledwithrelativeea
6、se.Thecomplexityofthehydraulicactuatordynamicsdoesnotallowaphysicalmodelamenabletoobserverdesign.Instead,systemidentificationyieldsasimplifiedempiricalmodelofthehydraulicactuator.Actualobserverdesignfocusesonguaranteeingrobuststabilityagainstparametricvariationsandtorqueestimationerrorsthat
7、areboundtooccurinamechanicalpowertransmissioncontrolsystem.Hardware-in-the-loopsimulationstudiesareconductedtoexaminetheperformanceoftherobustobserver-basedestimatorforthehydraulicactuatorpressure,whichshowstheviabilityoftheproposed第38页共38页中北大学2012届毕业设计英
