关键词: 湿式 ＤＣＴ, 转矩传递特性, 换挡模型, 换挡策略, 换挡品质, ＲＢＦＰＩＤ

Abstract: The precise control of the torque transmitted by the dual clutches in the wet DCT shift process has a decisive influence on the shift quality. However, the current shift control has the disadvantage of ignoring the viscous torque of the wet clutch. Therefore, this paper proposes a method for precise control of wet clutch torque through RBF-PID control algorithm based on the dynamic friction factor of wet clutch.A comprehensive model of the dynamic friction factor of the wet clutch engagement process, taking into account the strong non-linearity of the clutch torque transfer and the influence of temperature, is developed using the mean Reynolds equation and the G-W elastic contact model. Combined with a certain wet type DCT vehicle shift dynamics model and shift condition request torque, the dynamic friction coefficient model is introduced into the calculation of the expected combined pressure of the wet clutch, and the output pressure of the clutch pressure control valve is controlled by the RBF-PID pressure adaptive controller to realize the precise control of the clutch transmission torque. The results show that the use of this control method reduces the torque transmission error of the dual clutch compared with the situation where the viscous torque is neglected, and when the oil temperature is 40 ℃, 80 ℃, 120 ℃, the maximum impact of the shift process. The speed drops by 14.4%, 15.7%, and 13.4% respectively, Wet DCT gearshift quality has been effectively improved.