【摘要】 线控制动技术是未来汽车制动技术的发展方向,引起了国内外汽车制造商的广泛关注。针对现有汽车电子机械制动系统缺少GB12676—2014中规定的制动磨损补偿装置,创新设计了一种具有间隙自动调节功能的新型汽车电子机械制动系统。在MATLAB/Simulink中建立汽车电子机械制动系统的驱动电机、电机摩擦、蜗轮蜗杆、滚珠丝杠、负载的数学模型。搭建制动系统实验台,测试分析了系统在阶跃、三角波、方波、正弦信号下仿真与实验的制动性能区别,测试对比了系统在有/无间隙自动调节功能下的制动性能。实验结果显示,系统启动电流具有"尖峰"特性,制动正压力反应灵敏,可以满足制动要求。通过参数关系分析,得出制动正压力与堵转电流成线性关系,制动正压力与丝杠位移(电机转角)满足三次多项式的参数关系。仿真与实验结果验证了所建数学模型的正确性,所得到的参数关系可以为减少力传感器等装置的制动系统提供理论依据。所设计的间隙自动调节功能可以有效保障每次制动时制动间隙和制动响应时间的一致性,进一步提高制动系统的安全性能。更多还原

【Abstract】 Brake-by-wire technology is a development direction of the future automotive brake technology which has aroused extensive concern of domestic and foreign car manufacturers.Since the existing automotive electromechanical brake(EMB)was lack of wear compensation device which was specified in the national standard,GB12676—2014,an innovative EMB with gap automatic adjustment function was designed.The mathematical models of drive motor, motor friction,worm and gear,ball screw and loading were established by MATLAB/Simulink.By building the EMB bench,the braking performance differences between simulation and experiment were tested and analyzed under the signal of step,triangle wave,square wave and sinusoidal wave.The braking performances of EMB with the gap automatic adjustment function or nor were also tested and analyzed.The experimental results showed that the start-current of the EMB system had a"peak"characteristic and the clamping force was sensitive,which could meet the braking requirements.According to the experimental data,the parameter relations were concluded:the clamping force was linearly related to the locked-rotor current,and the characteristics of cubic polynomial were met by the relationship between clamping force and screw displacement.The correctness of the mathematical model was verified by the simulation and experimental results.A theoretical basis for reducing the force sensor and other devices could be provided by the conclusion of parameters relational characteristics.The experimental outcome indicates that the gap automatic adjustment function of the new EMB can guarantee that the brake gap and the response time are consistent at each time,which can further improve the safety of brakes.更多还原