汽车机动车理论课件_汽车机动车理论外文翻译.ppt

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1、《ElementaryVehicleDynamics》（《汽车理论》）PrefaceWhatcanwelearnfromthiscourse?What’stheaimofthiscourseTofindoutthereasonablemethodtodesignandusevehicleaccordingtotherelationshipamongtheparametersofstructureandperformanceofvehicle.（通过车辆结构参数与性能之间的关系，找到正确设计汽车的方法和合理使用汽车的途径）Chapterone–AccelerationPerformance§1.

2、1EvaluationIndex（评价指标）1.MaximumVehicleSpeed(Velocity)最高车速——uamax(km/h):（1）Definition：Themaximumspeedwhichthevehiclecangetundergoodandflatroadwithratedload（额定载荷).（2）ActualMeasurementofuamax2.AccelerationAbility（加速能力）（1）Theaccelerationabilityforstarting(原地起步加速能力)TestCondition:Fullenginepower（油门全开）;Opt

3、imalshiftpointbetweengears（最佳换档时机）whicharefromlowgear（第Ⅰ档）forstart-uptohighgear（最高档）forfueleconomy.EvaluationIndex—TTisthetimeneededbythevehicletoacceleratefrom0to0.8Uamaxundertheabovetestconditionorthetimeneededtopassthroughafixeddistance（400mor¼mile(402.5m)）.（用Ⅰ档起步，按最佳换档时间，逐次换至高档，油门全开，以最大加速度行驶，全力加

4、速至0.8uamax所需时间，或通过某一预定距离所需时间）（2）Theaccelerationabilityforhighspeeddriving(超车加速能力)Testcondition:Fullenginepower;Highgear（最高档）orinferiorhighgear（次高档）Evaluationindex——TTisthetimeneedtoacceleratefromtheminimumstablespeedofhighgear(最高档的最小稳定车速）to0.8Uamaxorthetimeneededtopassthroughafixeddistance（400mor¼mi

5、le）.(在直接档工作时，油门全开，由该档的最小稳定车速全力加速至0.8Uamax所需时间，或通过某一预定距离所需的时间）3.MaximumGradeabilityofVehicle——imax（最大爬坡度）（1）Definition：Themaximumgradewhichthevehiclecanclimbinthefirstgear（Ⅰ档）undergoodroadconditionwithfullyratedload（额定满载）.i=tgαEQ140imax=28%EQ240imax=58%α=30°（2）ActualMeasurementofimax§1.2DrivingMechan

6、icsofVehicleToanalyzethebalancebetweenTotalRoads（行驶阻力）andTractiveForce（驱动力）alongonedegreeoffreedom（自由度）thatislongitudinaldirection（纵向）.1.TractiveForce（驱动力）—TorqueofEngineFlyingWheel—NumericalRatiooftheTransmission—NumericalRatiooftheFinaldrive—Totalefficiencyofdriveline—TorqueofDrivingWheel(1)Torque

7、ofEngineEnginemaybecharacterizedbyitstorqueandpowercurveasafunctionofspeed.Figure1.showstypicalcurvesforgasolineengine.Figure1.Performancecharacteristics（外特性曲线）ofgasolineFullperformanceandFullperforma