Study on Shift Quality of Automatic Transmission

As more and more cars are equipped with automatic transmission nowadays,the requirement of riding comfort becoming more and more important. Cars will cause comfortlessness in the process of shifting,so study of shift quality has a very important meaning. A simple dynamic model of the shift process of automatic transmission was built. The clutch transmission torque and the transmission output shaft torque of the shift process were derived from the formula,study on the jerk and sliding friction work variation rules. Established the automatic transmission dynamics simulation model by ITI-Simulation X,then the shifting process were analyzed with the model. Different oil pressure variation rules of engage elements were analyzed to the influence of the jerk and the sliding friction work. It got some results which are beneficial to improve the shift quality.