湿式双离合器拖曳力矩算法及其应用

以某湿式双离合器总成为研究对象，分析了湿式双离合车辆在空挡（N挡）、驻车（P挡）怠速、蠕行过程中，离合器的输出扭矩变化机理；通过搭建输出扭矩的数学模型，得出了离合器片间隙润滑油膜的当量半径、峰值力矩、临界转速的理论计算公式，阐明了三者相互影响的动态关系；结合实验数据，论证了该模型的准确性，运用该模型可减小输出端扭矩波动、拖曳力矩和临界转速。

Drag Torque Algorithm of Wet DCT and Its ApplicationsLIU Bo

One type of wet DCT was taken as research subject, and the mechanism of output torque variations of the DCT for cars was analyzed in neutral/park positions while creeping or idling respectively. By building the mathematical model of the output torque， theoretical calculation formulas of the equivalent radius of lubricating oil film between DCT plates， the max drag torque and the critical rotational speed were figured out， and the dynamic interactions of three elements were illuminated. The accuracy was proved by experimental data， which may be used to reduce output torque fluctuation， drag torques and critical rotational speeds.