某型车辆液压换挡缓冲系统故障仿真分析

Fault Simulation Analysis of Hydraulic Shift Buffer System for a Certain Type of Vehicle

液压换挡缓冲系统是车辆减小换挡冲击、提高换挡品质的核心系统。车辆出现换挡失灵、换挡冲击、系统局部发热严重等故障都与液压换挡缓冲系统内部的异常状态紧密相关。对液压换挡缓冲系统进行理论分析的基础上,采用AMESim仿真软件对该系统进行建模,使用仿真结果与数学模型计算数据、试验台数据曲线对比,验证仿真模型的可行性。通过注入节流孔堵塞、阀芯卡滞、弹簧疲劳老化等典型故障要素对该系统展开故障仿真分析。得到换挡缓冲系统前端堵塞、缓冲阀阀芯位移量、保压阀弹簧刚度对缓冲油压特性的量化影响结果,并结合换挡油压曲线对具体故障现象展开分析。

The hydraulic shift buffer system is the core system of the vehicle to reduce the shift shock and improve the shift quality.The failure of shift,shift shock,and serious local heating of the system are closely related to the abnormal state of the hydraulic shift buffer system.Based on the theoretical analysis of the hydraulic shift buffer system,the AMESim simulation software was used to model the system,and the simulation results were compared with the calculation data of the mathematical model and the data curves of the bedstand to verify the feasibility of the simulation model.The fault simulation analysis of the system was carried out by typical fault factors such as injection orifice blockage,valve core stuck,spring fatigue aging and so on.The quantitative influence results of the front end blockage of the shift buffer system,the displacement of the buffer valve core,and the spring stiffness of the pressure-holding valve on the buffer oil pressure characteristics were obtained,and the specific fault phenomena were analyzed combined with the shift oil pressure curve.