汽車電動(dòng)助力轉(zhuǎn)向系統(tǒng)特性及其優(yōu)化研究.pdf

1、重慶交通學(xué)院碩士學(xué)位論文汽車電動(dòng)助力轉(zhuǎn)向系統(tǒng)特性及其優(yōu)化研究姓名：劉曉申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：載運(yùn)工具運(yùn)用工程指導(dǎo)教師：李偉丁良旭20050425重慶交通學(xué)院碩_=研究生學(xué)位論文AbstractllTheEPS(ElectricPowerSteering)systemisanewtypeofAutomobilePowerSteeringsystemComparedwithHPS(HydraulicPowerSteering)system

2、，thissystemwhoseassisttorqueisprovideddirectlybythemotorisdevoidofhydraulicpressurepumpTheassisttorqueiscontrolledbyECUAsthecarstuming，electromotorbeginsworking；otherwise，itstopsworkingSotheEPSsystemisatypeofsteeringsyst

3、emworkingaccordingtotheturningneedItcanimprovevehicleactivesafetysaveenergy，benefittheenvironment，andiseasytobemodularizedSoitisalsoanewhigh—technologywhichcloselyfollowsmodemautomobiledevelopmenttopicandaccordswiththede

4、velopingtrendofthefutureautomobilesteeringsystemTherefore，thestudyontheEPSsystemhasimportanttheoreticalmeaningandpracticalvalueThisarticle，accordingtoreducedordermodelingtheory，establishesdynamicaldifferentialequationsof

5、thesystem，consideringthesteeringshafttypeofEPSsystemasobjectThisarticlestudiestransferfunction，whoseinputissteeringwheelangleandoutputissteeringshaftangleWhendeterminingtheassisttorqueoftheEPSsystem，thepaperdeterminesthe

6、electromotorarmaturevoltagebyadoptingproportiondifferentialcontrolmethod，accordingtocontrollingforceofsteeringwheel，whichdetectedbytorquetransducerTheassisttorquecharacteristicsareanalyzedinthisarticlebasedontwoaspects，t

7、imeresponseandfrequencyresponseAndconclusionsCanbedrawnthatbyusingproportion—differentialcontrolmethod，whenproportioncoefficientisaugmented，theassisttorquewillbeincreasedbuttransientresponseofassistcharacteristicswillbed

8、eteriorate，anddifferentialcoefficientdoesnotaffecttheassisttorque，butincreasingdifferentialcoefficientCanimprovetransientresponseandfollowingcharacteristicofthesystemThisarticleestablishesITAEtypeoptimizingobjectfunction

9、，optimizesthecontrollingparametersofassistcharacteristicsaccordingtosimplexalgorithmmethodinMATLABandfindsthattheassistcharacteristicsofEPSsystemaregreatlyimprovedafteroptimizingThismethodissimple，reliableandeffectiveKey