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EvaluationIndex(评价指标)L/100km，L/t·100km，MPG，km/L；CalculationofFuelQQ1.02u(L/ aaverage1(FfWFjT2(GfC dt)InfluenceFactorsofFuelyzingBasis(分析依据Vehicleusageaspect（使用因素VehicleStructureAspect（结构因素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（经济车速区间）FuelFuelconsumptioncurveofaGearChoice（given CB
aAB——neededpower（ua
km/uua reaseswithchoosinglowergearQsdecreaseswithchoosinghigherItisanevidencetoprovethattraditionalvehiclescouldnotwininbothaccelerationperformanceandeconomyperformance.TheApplicationofηⅠⅡ outputoutputpoweroutputpowerbnotrailercarryingQtmeansthefuelconsumptionofeachuntiemass;itistheevaluationindexofTransportationEfficiency.Heremaintenancemainlyrefertothelubricationconditionsofallthemovingpartsofthedriveline.Weusuallyusecoastingperformance（滑行性能ofthevehicletojudgeitslubricationconditionsandwecalledthisasCoastingTest(滑行实验检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（空气阻力系数）aslowaspossible.Method:drop-likebodyorstreamlinedRadial
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