Research On Modeling And Control Of Engagement Performance Of Dry DCT

Dry DCT module can become the breakthrough point of Chinese corner overtaking transmission technology,because of its high efficiency and stable energy transmission,low oil consumption,low emissions,fast response performance,and low cost of development;and inherits a series of manual transmission's advantages.In recent years,DCT technology has become the focus of the major car companies.The development of DCT technology is of great significance for improving the automatic transmission technology in China,getting rid of the monopoly of foreign transmission technology and promoting the development of China's automobile industry.In recent years,the major domestic auto manufacturers have launched matching DCT models.However,in recent years about the frequent occurrence of DCT problems,caused the market to double DCT technology.In this paper,first summarizes the nearly ten years of domestic introduction of the car with DCT,at the same time,it summarizes the problems,and analyzes its causes.Then,based on the analysis of the problems of the DCT which has been widely complained in the market,it is found that the key technology of DCT lies in the structural characteristics of the dry DCT itself and a series of problems caused by the design of the control system.In this paper,through the dry DCT modeling,simulation analysis,put forward the optimization scheme.The torque transfer model of the dry DCT is established,and the relationship between the actuator control parameters and the clutch transmission torque is analyzed,so as to achieve the goal of accurate control of the clutch transmission torque.In order to establish the corresponding relationship between the actuator control parameters and the clutch transmission torque,the axial compression characteristics of the diaphragm spring and the driven disk were analyzed in detail,and the relationship between the engaged bearing and the clutch transmission torque was obtained.At the same time,a feedback control strategy based on clutch torque observer is proposed and designed to improve the accuracy of clutch switching timing during vehicle starting and shifting.Finally,the dynamic model of starting and shifting of DCT system is established by using the modeling method of Kane equation and bond graph,and the starting and shifting process of double clutch transmission is analyzed,the control strategy of starting and shifting is summarized,and the closed-loop controller of clutch actuator isdesigned.In order to verify the accuracy of the proposed control strategy and the designed controller,the DCT vehicle starting and shifting process was simulated and analyzed in Matlab/Simulink environment.Simulation results show that the proposed control strategy and the designed controller can improve the performance of DCT vehicle during starting and shifting.