基于AMESim汽车制动液压系统特性建模分析

Characteristic Modeling and Analysis of Automotive Brake Hydraulic System Based on AMESim

制动液压系统是整车液压系统的关键部件,直接影响新车安全。根据车辆制动系统需求,对行车和停车两种制动液压系统的原理进行分析,在此基础上设计确定制动系统中制动器、制动泵、蓄能器、系统压力等主要结构单元的关键参数;基于AMEsim搭建制动液压系统的分析模型,对液压系统中蓄能器充液过程进行分析,研究充液阀溢流值与蓄能器充液压力之间的关系;对系统工作性能进行分析。采用液压测试系统对某实际车辆制动液压系统的工作过程进行测试,以验证前述分析的准确性。结果可知:充液阀中溢流阀的开启压力直接决定充液阀的功能是否能够实现,需综合考虑系统的最高充压和充液阀的充液速率;不同压力结果表明,所研究的制动系统溢流阀开启值最佳值为16.5MPa;实测结果为16.1MPa,与仿真分析结果误差为2.5%,同时变化规律也保持一致,表明前述分析的准确性,为同类设计提供参考。

The brake hydraulic system is the key component of the whole vehicle hydraulic system,which directly affects the safety of new vehicles.According to the requirements of vehicle braking system,the principles of service and parking braking hydraulic systems were analyzed.On this basis,the key parameters of main structural units such as brake,brake pump,accumulator and system pressure in the braking system were designed and determined.The analysis model of brake hydraulic system was built based on AMESim,the charging process of accumulator in hydraulic system was analyzed,and the relationship between overflow value of charging valve and charging pressure of accumulator was studied.The performance of the brake was analyzed.Based on the actual vehicle,the working process of the accumulator of the braking hydraulic system and the pressure change of the system were analyzed to verify the reliability of the above analysis.The results show that:the opening pressure of the overflow valve in the filling valve directly determines whether the function of the filling valve can be realized,and the maximum filling pressure of the system and the filling rate of the filling valve need to be comprehensively considered.The results of different pressures show that the optimal opening value of the relief valve of the braking system is 16.5MPa.The measured result is 16.1MPa,and the error be⁃tween the measured result and the simulation analysis result is 2.5%.At the same time,the change law is also consistent,which shows the accuracy of the above analysis and provides a reference for similar designs.