車輛工程

1、摘要隨著電子技術(shù)和計算機(jī)控制技術(shù)的發(fā)展，越來越多的節(jié)能環(huán)保機(jī)電產(chǎn)品和新技術(shù)在汽車上應(yīng)用。作為影響汽車行駛安全最為重要的系統(tǒng)之一—轉(zhuǎn)向系統(tǒng)也正由液壓助力轉(zhuǎn)向系統(tǒng)過渡到電動助力轉(zhuǎn)向系統(tǒng)（ElectricPowerSteeringSystem）。EPS系統(tǒng)有著傳統(tǒng)轉(zhuǎn)向系統(tǒng)無法比擬的優(yōu)點而廣泛應(yīng)用在中高端汽車上，并逐漸成為轎車助力轉(zhuǎn)向系統(tǒng)的主流。EPS技術(shù)在國外已較為成熟，廣泛應(yīng)用于各種汽車上，國內(nèi)才剛剛起步，主要在微型車上進(jìn)行了量產(chǎn)。為了打破

2、國外對EPS技術(shù)的壟斷，縮短產(chǎn)品開發(fā)周期，降低產(chǎn)品成本，提高EPS產(chǎn)品性能，本文對EPS系統(tǒng)開發(fā)平臺進(jìn)行了研究。本課題是清華大學(xué)承擔(dān)的國家863項目“電動汽車電控助力轉(zhuǎn)向系統(tǒng)研究與開發(fā)”的子項目。論文在分析EPS系統(tǒng)的發(fā)展現(xiàn)狀、性能特點的基礎(chǔ)上，研究了EPS系統(tǒng)開發(fā)平臺的工作原理和總體結(jié)構(gòu)。論文研究了EPS系統(tǒng)開發(fā)平臺硬件的兩種方案。第一種方案是由負(fù)載電機(jī)模擬載荷，滾珠絲杠把電機(jī)的旋轉(zhuǎn)運(yùn)動變成直線運(yùn)動，來傳遞載荷；第二種方案是由伺服電機(jī)

3、模擬載荷，電動伺服缸傳遞載荷。論文建立了開發(fā)平臺的整車模型和輪胎模型，通過EPS仿真模型代替實物硬件與整車模型關(guān)聯(lián)起來，通過Matlabsimulink平臺，對EPS系統(tǒng)的性能進(jìn)行了仿真分析，結(jié)果表明EPS系統(tǒng)開發(fā)平臺能夠較好地驗證被試EPS總成的性能。關(guān)鍵詞：汽車電動助力轉(zhuǎn)向開發(fā)平臺仿真ABSTRACTWiththedevelopmentofelectroniccontroltechnologycomputercontroltechn

4、ologymememechanicalelectricalproductsofenergyconservationenvironmentalprotectionareusedinautomotivethesteeringsystemasoneofthemostimptantsystemaffectingthedrivingsafetyistranslatingfromaprecededhydraulicpowersteeringsyst

5、emtoelectricpowersteeringsystem(ElectricPowerSteeringSystem).theEPSsystemiswidelyusedinhighendcarbecauseofitsincomparableadvantagesgraduallybecomethemainstreamcarpowersteeringsystem.EPStechnologyinoverseashasbeenmemature

6、widelyappliedinallkindsofcarswhilethedomestichasjuststartedmainlyfocusonthequantityofproductionofthemicrocar.IndertobreakthemonopolyoftheoverseasfEPStechnologyweshtenthedevelopmentcyclereducetheproductioncostimproveEPSpr

7、oductperfmance.ThethesishasstudiedtheEPSsystemexperimentalplatfm.Thistopicisthesubprojectofthenational863projectson“electriccarelectricpowersteeringsystemresearchdevelopment”whichundertakedbythetsinghuauniversity.Basedon

8、thebasisofanalyzingtheEPSsystemdevelopmentpresentsituationtheperfmancefeaturesthethesishasstudiedthewkingprinciplesoverallstructuresoftheEPSsystemdevelopingplatfm.ThethesishasstudiedtwoschemesaboutthehardwareoftheEPSsyst

9、emdevelopingplatfm.ThefiirstschemeisthatoadmotsimulateloadtheballscrewtransmitloadbyturningthemotrotationmovementintoalinearmotionThesecondschemeisthatservomotsimulateloadelectricservocylindertransmitload.Thethesishasest

10、ablishedthedevelopmentplatfmofvehiclemodeltiremodeltheEPSsimulationmodeltaketheplaceofphysicalhardwarethenitconnectswithvehiclemodelthroughtheMatlabsimulinkplatfmwehavesimulatelyanalysedperfmanceofEPSsystemtheresultsshow