1.2 DrivingMechanics of Vehicle汽车驱动力和行驶阻力Transmission Courses ofAutomobile（汽车动力传递路线）：. To analyze theEngine发动机balancebetweenClutch离合器Driving Resistance(行驶阻力)andGearBox(orTransmission)变速器Tractive Force(驱AssistantGearbox副变速器一动力)along onePropellerShaft传动轴一→degree offreedom(Final Drive主减速器自由度)that isDifferential差速器longitudinaldirection(纵向)HalfAxle半轴WheelRetarder轮边减速器一DrivingWheel驱动车轮Chapter1AccelerationPerformance
Chapter 1 Acceleration Performance 1.2 Driving Mechanics of Vehicle 汽车驱动力和行驶阻力 Transmission Courses of Automobile(汽车动力传递路线) : Engine发动机→ Clutch离合器→ Gear Box(or Transmission)变速器→ Assistant Gear box副变速器→ Propeller Shaft传动轴→ Final Drive主减速器→ Differential差速器→ Half Axle半轴→ Wheel Retarder轮边减速器→ Driving Wheel驱动车轮 • To analyze the balance between Driving Resistance (行驶阻力)and Tractive Force(驱 动力) along one degree of freedom( 自由度) that is longitudinal direction(纵向). 1
1.TractiveForce（驱动力）TTgigioN,=T一TorqueofEngineFlyingWheel（发动机转矩）T一一NumericalRatiooftheGearbox（变速器传动比）lo一NumericalRatiooftheFinaldrive（主减速比）nT—Totalefficiencyofdriveline（传动系机械效率）T，一TorqueofDrivingWheel（驱动轮转矩）2Chapter1 Acceleration Performance
Chapter 1 Acceleration Performance 1. Tractive Force（驱动力） Ttq ig i T Tt 0 Ttq — Torque of Engine Flying Wheel (发动机转矩) — Numerical Ratio of the Gear box(变速器传动比) — Numerical Ratio of the Final drive (主减速比) — Total efficiency of driveline (传动系机械效率) — Torque of Driving Wheel (驱动轮转矩) 0 i g i T Tt Tt 2
令:F,=IWTaigionrL-F,TFF1F7F, ~ Fo此图非严格意义的受力图！TractiveForce（汽车驱动力）3Chapter1 AccelerationPerformance
Chapter 1 Acceleration Performance Tractive Force（汽车驱动力） a u Ft F0 FZ W Tt Ft F0 tq g T 0 t T i i F r : t t T r 令 F 此图非严格意义的受力图！ r 3
(1)TorqueofEngineEngine maybe characterized by its torque and power curve as a function ofrotate speed. Figure shows typical curves for gasoline enginePemaxtqmaxTorquePowernnnnminmax01ExternalCharacteristic(FullThrottlePerformance)Curveofgasoline汽油发动机外特性曲线4Chapter1AccelerationPerformance
Chapter 1 Acceleration Performance Pemax Ttqmax tq n p n min n nmax External Characteristic (Full Throttle Performance) Curve of gasoline汽油发动机外特性曲线 Torque Power 4 （1）Torque of Engine • Engine maybe characterized by its torque and power curve as a function of rotate speed. Figure shows typical curves for gasoline engine
Full performance andFull performance with all the accessories(外特性与使用外特性）PowerDTorqueFullPerformanceFull Performancewith all.theaccessoriesn(rated rpm)speed(r/min)5Chapter1AccelerationPerformance
Chapter 1 Acceleration Performance Full performance and Full performance with all the accessories (外特性与使用外特性) 5