车辆制动油管液体压力传递特性分析  

Analysis of Transmission Characteristics for Fluid Pressure Inside Vehicle Brake Pipeline

作　　者：丁问司[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510641

出　　处：《应用基础与工程科学学报》2011年第3期466-473,共8页Journal of Basic Science and Engineering

基　　金：国家自然科学基金资助项目(50775075);机械系统与振动国家重点实验室资助项目(VSN-2008-01)

摘　　要：车辆采用ABS系统进行制动控制时,对制动压力响应能力提出了较高要求.当车辆制动管道较长时,管道内制动液体压力传递特性是影响这一能力的重要因素.由于制动管道内存在高频压力变化,对ABS制动管道压力传递的研究不适宜用集中参数模型,而应采用分布式管道参数模型.通过建立包含14个变量组成的制动系统仿真模型,可计算获得特定制动管道压力传递频域特性解.通过对频域特性解的辨识可进一步获得精确的管道压力传递函数表达式.利用传递函数表达式对具有不同参数的制动系统阶跃响应特性进行对比,发现制动液温度和制动管径的变化对管道的压力传递能力影响显著.车辆制动系统控制逻辑应根据管道参数的变化进行调整.The brake pressure fast response ability is necessary when vehicle using ABS brake control system.When the brake pipe is longer,the transmission characteristics of brake fluid pressure inside the pipeline are important factors affecting the ability.As the pressure changes with high frequency in the brake pipeline,it is inappropriate to adopt the lumped parameter model for the study of ABS pipeline pressure transmission,and the distributed pipeline parameter model should be used.The frequency-domain solution of specific brake pipe pressure transmission characteristics can be calculated by establishing braking system simulation model including 14 variables.An accurate expression of brake pipeline pressure transmission function may be obtained by identifying the characteristics of frequency domain solution.It is found that the changes of brake fluid temperature and pipeline diameter makes significant effects on the pressure transmission capacity of the pipeline,when using the transfer function expression to compare the step response to the brake system with different parameters.The control logic of vehicle braking system should be adjusted along with the changes of pipeline parameters.

关 键 词：制动管道 压力模型 传递函数 

分 类 号：O351.2[理学—流体力学] U463.521[理学—力学]