Optimal control of gear hift on wet dual-clutch automatic transmission

In order to improve the gearshift quality of vehicles equipped with wet dual-clutch automatic transmission, the gearshift strategy for different stages of gearshift process was proposed and a dynamic model of gearshift process was established. Optimal control trajectory of clutch pressure at every gearshift stage was obtained by optimal control algorithm in which longitudinal jerk and friction work were chosen to form quadratic performance index function, and the optimal control of clutch pressure in the gearshift process was realized by using optimal control trajectories. In order to verify the validity of optimal gearshift control, real vehicle gearshift tests were conducted, which showed that jerk and friction work could be well equilibrated, and the optimal gearshift control could meet the requirements of ride and rapidness in the gearshift process. This study can provide an effective gearshift control strategy for wet dual-clutch automatic transmission.