《汽车理论》课程教学课件（英文讲稿）第4章 汽车制动性 Braking Performance 4.1 Evaluation Index（评价指标）

Chapter4BrakingPerformance汽车的制动性4.1EvaluationIndex（评价指标）4.2BrakingMechanics（制动时车轮的受力）4.3BrakingEfficiencyanditsStability（制动效能及其恒定性）V（制动时的方向稳定性4.4Braking Steering Stability4.5BrakingProportioning（前、后制动器制动力的比例关系）

Chapter 4 Braking Performance 汽车的制动性 4.1 Evaluation Index（评价指标） 4.2 Braking Mechanics（制动时车轮的受力） 4.3 Braking Efficiency and its Stability（制动效能及 其恒定性） 4.4 Braking Steering Stability（制动时的方向稳定性） 4.5 Braking Proportioning（前、后制动器制动力的 比例关系）

Definition of BrakingPerformance（汽车制动性定义）：The ability of vehicle to reduce its speed into zero inshort distance keeping its original drive directionand to sustain the stable deceleration ability whendowngrade.（汽车行驶时能在短距离内停车且维持行驶方向稳定性和在下长坡时能维持一定车速的能力。）(Braking performance belongs to the item ofvehiclesafety.)

（Braking performance belongs to the item of vehicle safety.） • Definition of Braking Performance (汽车制动性定义): • The ability of vehicle to reduce its speed into zero in short distance keeping its original drive direction and to sustain the stable deceleration ability when downgrade. (汽车行驶时能在短距离内停车且维持行驶方向稳定 性和在下长坡时能维持一定车速的能力。)

（评价指标）4.1 Evaluation Index1.BrakingEfficiency（制动效能）What's braking efficiency?It is used to describe how soon thevehicle could reduce its speed into zero.BrakingEfficiencyindex:StoppingDistance制动距离，BrakingDeceleration制动减速度（制动效能的恒定性）2.StabilityofBrakingEfficiencyIt is used to describe how long the vehicle could sustain the stabledeceleration ability with heat damage, in short it is called heatendurance.抗热衰退性能3.BrakingSteeringStability（制动时的方向稳定性）It is to describe the ability of vehicle to keep its original drivedirectionwhen brakes work.(Including off-tracking跑包偏，sideslip侧滑andlosingthesteeringability失去转向能力）

4.1 Evaluation Index（评价指标） 1.Braking Efficiency（制动效能）  What’s braking efficiency? It is used to describe how soon the vehicle could reduce its speed into zero.  Braking Efficiency index: Stopping Distance制动距离; Braking Deceleration制动减速度 2.Stability of Braking Efficiency （制动效能的恒定性）  It is used to describe how long the vehicle could sustain the stable deceleration ability with heat damage, in short it is called heat endurance.抗热衰退性能 3.Braking Steering Stability（制动时的方向稳定性）  It is to describe the ability of vehicle to keep its original drive direction when brakes work. (Including off-tracking跑偏, sideslip 侧滑 and losing the steering ability失去转向能力 )

附：乘用车制动规范对行车制动器制动性的部分要求美国项目中国中国欧洲共同体(EEC)ZBT24007GB7258联邦13571/320-1989-2012试验路面干水泥路面附着良好β ≥0. 7Skid no81载重满载一个驾驶员任何载荷轻、满载或满载制动初速80km/h80km/h50km/h96.5km/h度(60mile/h)制动时的不许偏出不抱死跑偏不许偏出不抱死偏出稳定性3.7m通道2.5m通道3.66m（12ft）制动距离≤50.7m≤20m≤65.8m≤50.7m,或制动减速≥5. 8m/s2(216ft)≥5. 9m/s2度踏板力<490N≤500N≤500N66.7~667N（15~150lbf)

项目 中国 ZBT24007 -1989 欧洲共同体 （EEC） 71/320 中国 GB7258 -2012 美国 联邦135 试验路面 干水泥路面 附着良好 ≥0.7 Skid no81 载重 满载 一个驾驶员 或满载 任何载荷 轻、满载 制动初速 度 80km/h 80km/h 50km/h 96.5km/h （60mile/h） 制动时的 稳定性 不许偏出 3.7m通道 不抱死跑偏 不许偏出 2.5m通道 不抱死偏出 3.66m（12 ft） 制动距离 或制动减速 度 ≤50.7m ≤50.7m， ≥5.8m/s2 ≤20m ≥5.9m/s2 ≤65.8m （216ft） 踏板力 ≤500N <490N ≤500N 66.7～667N (15～150 lbf)  附：乘用车制动规范对行车制动器制动性的部分要求

Inquiries after-class·GB7258?5

Inquiries after-class • GB7258？ 5