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建立了基于恒速制动车辆纵向力平衡方程、制动器耗散功率及其温度变化微分方程、管路压力调节等子模型的恒速长下坡汽车制动器摩擦性能分析系统。以两轴中型汽车为例,对前后制动器在不同挡位发动机制动时的温度、制动副摩擦因数、制动力分配及管路压力变化进行了计算。结果表明,在不影响车速情况下,合理使用各挡发动机制动可改善汽车前、后制动器热负荷,减小或避免制动摩擦力矩热衰退,保证汽车下长坡安全行驶。
The frictional performance analysis system of vehicle brake based on the longitudinal force balance equation of constant speed brake vehicle, brake power dissipation and its temperature variation differential equation, pipeline pressure regulation and other sub-models is established. Taking a two-axle mid-sized car as an example, the temperature, brake friction coefficient, brake force distribution and line pressure variation of front and rear brakes at different gear positions are calculated. The results show that without affecting the vehicle speed, the rational use of each block engine brake can improve the front and rear brakes thermal load, reduce or avoid the thermal friction braking torque decline, to ensure the safety of the vehicle down the long ramp.