Study on the coupling effect of controllable parameters on the dynamic characteristics of vehicle shift process throughout full life cycle of clutch

Abstract In this study, coupling effect of controllable parameters on the dynamic characteristics of vehicle shift process throughout full life cycle of wet clutch was studied. Firstly, an improved dynamic model of driveline was established with consideration of friction characteristics of clutch, time-varying mesh stiffness of gears, and torque-coupling effect. Then, dynamic characteristics of driveline during shift process were analyzed, and the model was validated with an experiment. Based on the model, the effect of frictional characteristics of clutch on the dynamic characteristics of driveline were analyzed, and to reduce the adverse effects caused by the degradation of frictional characteristics on the dynamic characteristics of driveline, a control strategy was proposed, which control the rising rate of on-coming clutch pressure and the maximum pressure coordinately. the influence of these two controllable parameters on the dynamic characteristics of driveline during shift process throughout the whole life of wet clutch life was analyzed. The results showed that side effect caused by the degradation of clutch frictional characteristics on the driveline during shift process can be attenuated by controlling the rising rate of on-coming clutch pressure and the maximum pressure coordinately.