液压ABS回油泵的控制策略及其对制动特性的影响

针对液压防抱死制动系统(anti-lockbrakingsystem,ABS)开发过程中遇到的车轮抱死?踏板舒适性不良等实际问题,重点研究液压ABS回油泵的控制策略及其对制动性能的影响?建立了回油泵流量数学模型,轮缸数学模型,并验证了模型的正确性?在AMESim中建立液压系统模型,通过设计仿真实验,对回油泵的开启时间和转速对ABS系统的影响进行了分析,得出了在进入ABS控制时,回油泵首先应保持低速运转,以克服静态摩擦和减小自身惯量,减压时,再加快转速和首次保压时低速开启的启动方式的结论,最后得出了回油泵的控制策略,通过实验对控制策略进行了验证?结果表明,在所提出的控制策略下取得了良好的控制效果,并能有效地抑制主缸的压力波动,改善驾乘舒适性能?

Control strategies of hydraulic ABS oil pump and its influence on braking characteristics

In allusion to the practical problems such as wheel locked and bad pedal comport encountered in the development process of hydraulic ABS,this paper focuses on the oil pump control strategy and its influence on the braking performance.The flow mathematical model of the oil pump and the mathematical model of the wheel cylinder are built up in this paper. The model is verified correctly.The hydraulic system model is established in the AMEsim.The influence of the opening time and speed of the oil pump on the anti-lock brake system is analyzed and the control strategy of the oil pump is proposed through designing simulation experiments.It is concluded that when entering the ABS control, first of all the oil pump should maintain a low speed in order to overcome the static friction and reduce their moment of inertia and when decompression,the oil pump should speed up the speed and the keeping a low speed when pressure maintaining first.The control strategy is verified through experiments. The results show that good control effect is achieved with the proposed control strategy,the master cylinder pressure fluctuation is effectively restrained and the ride comfort performance is improved.