线控制动系统制动力分配策略的研究与仿真

Study and Simulation of Brake Force Distribution Method for Brake-by-wire System

研究车轮制动系统优化问题,针对传统的液压制动系统在设计制动力的分配时存在不足,使得各车轮的附着条件无法得到充分的利用,从而不能有效的缩短制动距离。线控制动系统是由电机提供制动力,使得制动压力可以在各个车轮之间进行灵活的分配。为了使各个车轮的附着条件均得到充分的利用,提出了基于各车轮垂直载荷的线控制动系统制动力分配策略,并分别在直道与弯道制动的情况下对线控制动车辆与液压制动车辆进行仿真对比。结果表明,线控制动车辆的四个车轮几乎同时发生抱死,且缩短了制动距离,优化效果明显,为线控制动系统的实际应用提供了参考。

There are some disadvantages in the design of the brake force distribution method for traditional hydraulic brake system.Therefore,the tracting ability of each tire can not be used sufficiently in most situations,which can not better shorten the stopping distance.In brake-by-wire system,the brake force is provided by the motor,thus the brake force can be distributed to each tire flexibly.In order to make the traction ability of each tire more sufficiently,the brake force distribution method for brake-by-wire system based on the normal load was explicitly proposed.Vehicle equipped with the brake-by-wire system and vehicle equipped with the traditional hydraulic system were compared and analyzed when respectively braking on straight and crooked road.The result revealed that the four wheels of the vehicle equipped with the brake-by-wire system locked almost simultaneously,and the stopping distance was shorter compared with the vehicle equipped with the traditional hydraulic system.So this brake force distribution method makes the traction ability of each tire more sufficiently.And this study is helpful to the application of brake-by-wire system.