汽車?yán)碚?753上節(jié)課內(nèi)容回顧

EvaluationIndex(評(píng)價(jià)指標(biāo))L/100km，L/t·100km，MPG，km/L；CalculationofFuelQQ1.02u(L/ aaverage1(FfWFjT2(GfC dt)InfluenceFactorsofFuelyzingBasis(分析依據(jù)Vehicleusageaspect（使用因素VehicleStructureAspect（結(jié)構(gòu)因素QQsTFFFT [g/kWh] bQ[L/WfF PeagQs 3672 Cconst，CCconst，C13672,FGfaD AuQsF、Tb bbmeetsitsminimumvaluewhentheoutput-powerratiocomecloseto80%.

output-powerratio

?decreaseofbunderthegiven?decreaseofbunderthegivenn.(inmostinstance);reaseswithb(g/kWoutput-powerratioalwaysreaseswiththedecreaseofb.(inmostPe

outputpowercharacteristicsofEnergyEnergyBalanceofacarwithdrivecycle(CityorHigh-way）IdleParking

ofofFuel

Wasteof（ludingheatwasteandmechanismwaste

Wasteof

Vehicleusage1.1.ua（givenCurveofCurveofQs~ua→ug（Economy-RangeofSpeed）CurveCurveofQs~ua（highug(EconomyRangeofSpeed)ua(km/CurveCurveofQs~ua（highug(EconomyRangeofSpeed)ua(km/ Thereaseofbcausedbymuchloweroutput-powerratioisthemainfactorcausingthereaseofQswhenthevehicleisdrivenwithlowspeed;Althoughbdecreasesgreatlyforthe reaseofoutput-powerratio,thetremendous reaseofneededpower-peisthemainfactorcausingthe reaseofQswhenvehicleisdrivenwithhighspeed; Becauseoftheabovetwoconclusions,Qscouldpossiblymeetitslowestvaluewhenthevehicleisdrivenwiththemediumrangeofspeedwherebandpewouldescapefromgettingtheirhighvalue,andwecallthisrangeasEconomy-RangeofSpeed（經(jīng)濟(jì)車速區(qū)間）FuelFuelconsumptioncurveofaGearChoice（given CB

aAB——neededpower（ua

km/uua reaseswithchoosinglowergearQsdecreaseswithchoosinghigherItisanevidencetoprovethattraditionalvehiclescouldnotwininbothaccelerationperformanceandeconomyperformance.TheApplicationofηⅠⅡ outputoutputpoweroutputpowerbnotrailercarryingQtmeansthefuelconsumptionofeachuntiemass;itistheevaluationindexofTransportationEfficiency.Heremaintenancemainlyrefertothelubricationconditionsofallthemovingpartsofthedriveline.Weusuallyusecoastingperformance（滑行性能ofthevehicletojudgeitslubricationconditionsandwecalledthisasCoastingTest(滑行實(shí)驗(yàn)檢Usuallythecoastingdistanceismorethan230meterswiththeinitialvehiclespeedof50km/hor30km/h,otherwisethevehicleisconsideredasonewithbadVehicleStructure1.1.TheweightanddimensionofvehicleAim:Toreducetheweightofvehicleasmuchaspossible.optimizationdesignof2.2.Engineisanimportantdeterminantoffueleconomyperformanceofthevehiclebecauseitisthe cewherebcomesfrom. reaseheatandmechanismefficiencyofgasolineUsingdieselenginefarandUsingelectroniccontroltechnologyfarand3.3. Q(Q b Thegearratiooffinaldrivegear-Gearratio-

Formakingtheengineworksaccordingtotheidealcurvethereshouldbelotsofgearratiostomatchtheratioofthecalculationbehind:Minimalbcurve-optimalMinimalbcurve-optimalPe~nPe~ncurve(themosteconomicalworkingn2e(kW P'PeRatioofCVTi

0.377

An

/ Theoptimalcurveofengineisthe cewheretheoutput-powerratiogetstheirminimumvalueunderthecorrespondingn; tyofgearratiosisthepreconditionformakingtheengineworkaccordingtoitsidealcurve.Becauseoftheviciouslossoftransmissionsystem,Qs reasesforthemuchbiggerdemandofoutputpoweroftheengine-Pe.4.The4.TheshapeofbodyandTheshapeofAim:TomaketheCD-Aerodynamicdragcoefficient（空氣阻力系數(shù)）aslowaspossible.Method:drop-likebodyorstreamlinedRadial