面向液力变矩器负载的泵轮动态转矩估计模型

Estimation Model of Pump Wheel Dynamic Torque Based on Load of Torque Converter

为解决传统液力变矩器泵轮转矩静态模型与其实际载荷特征的非关联性问题,实现液力变矩器在初始配置设计中与发动机的动态性能匹配,提出面向液力变矩器负载特征的泵轮动态转矩估计模型.在对现有液力变矩器模型分析的基础上,得出一元束流理论模型比质量弹簧阻尼系统模型更全面,其泵轮动态转矩考虑了液力变矩器的载荷特征,以此提出液力变矩器泵轮转矩模型的载荷波动项概念;通过基于控制变量法的载荷波动项解析,与全面流体动力学仿真试验结果的比较,证明了面向液力变矩器负载特征的泵轮动态转矩估计模型的有效性.该模型对液力变矩器在关联整机载荷特征的动态初始配置设计中具有较好的指导作用.

In order to solve the non-association between the traditional torque converter pump wheel static model and its actual load characteristics, and to achieve the dynamic performance matching between the torque converter and the engine in initial configuration design, a pump wheel dynamic torque estimation model based on the load characteristics of torque converter was proposed. Based on the analysis of the existing torque converter model, the one-dimension flow theory model, which took the load characteristics of the torque converter into account, was more comprehensive than the mass-spring damper system model. Besides, the concept of load fluctuations of torque converter pump wheel torque model was proposed. The validity of pump wheel dynamic torque estimation model based on the load characteristics of torque converter was proved by comparing the analysis of load fluctuations through the method of controlling the variables with the results of the comprehensive CFD simulation experiments. This model provides guidance for the torque converter dynamic initial configuration design, which is associated with the load characteristics of the machine.