自动变速器换档品质研究

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1、上海交通大学硕士学位论文自动变速器换档品质研究姓名：卓鹏申请学位级别：硕士专业：车辆工程指导教师：何维廉20070301上海交通大学硕士论文的模型进行了适当的简化，从而建立起自动变速器换档过程的等效简明力学模型，推导出换档过程的一般运动方程。依据所建立的简化模型，对换档过程的搭接控制、油压变化规律进行分析，获得许多对提高换档品质有益的控制结论。应用MATLAB-SIMULINK建立自动变速器动力传动系统的仿真模型，分别对AG4自动变速器2H-3H升档过程和3H-2H降档过程进行了分析。仿真结果证明了模型的正确性，并且验证了对换档结合元件合理的油压变化规律控制可以显著的提高换档品质。仿真特别

2、研究了滑摩功大小的影响因素，指出减小换档过程滑摩功的方法。关键词：自动变速器，换档品质，油压-v-上海交通大学硕士论文ThestudyontheshiftqualityofautomatictransmissionABSTRACTAsthedevelopmentofautomobiletechnology,theconvenienceandcomfortarehighlydesiredbypeople,somoreandmoreautomatictransmissionsareinstalledtocars.Automatictransmissionisthemainpartoftheve

3、hicledrivingsystem,soithasmuchinfluenceontheperformanceofthevehicle.Automatictransmissionshiftupanddownthroughthejointandwithdrawingoftheunitecomponents,sotheshiftprocessisactuallytheprocessjointingandwithdrawingoftheunitecomponents.Becauseofthedifferentspeedratios,thestateofthedrivingsystemhasasu

4、ddenchange,butthejointcomponentscan’tactintime;Andatsometimethefrictionmomentofthecomponentschange;AllThesewillcauseaimpactofthevehicleandtheincreaseofthecomponentstemperature.InthispapertheinfluenceofAutomatictransmission’sshiftprocesstovehicledrivingsmoothness,drivesystemloadandthelifeoftheunite

5、componentsisanalyzed.Theevaluationmethodandindexofshiftqualityareintroducedfromsubjectiveandobjectivepoints.Alsothemethodstoimprove-vi-上海交通大学硕士论文theshiftqualityarebroughtforwardbasedontheinfluencingfactors.Itwillsimplifythestructureoftheplanetgeartoapplytheleveranalogytoplanetgearsystem,andthedyna

6、micsequationsareeasytoget.Thedynamicsmodeloftheautomatictransmission’sshiftprocessisbuiltupthroughsimplifyingtheengine-torqueconvertermodel.Sothedynamicsequationsareobtainedfromthemechanicsmodel.Theshiftprocessandtheoilpressureregulationsarestudiedandmanyconclusionsaregottoimprovetheshiftquality.T

7、hesimulationmodelisbuiltupbythesoftwareMATLAB/SIMULINK.AG4’sshiftupprocess(2H-3H)andshiftdownprocess(3H-2H)arestudiedbasedonthismodel.Thesimulationresultsprovethatthemodelisvividandthereasonableoilpressurecanhigh