Optimal Clutch Control of a One-way Clutch Assistant Transmission for Electrical Vehicles

Abstract

An optimal clutch control of a one-way clutch assistant transmission (OCAT) for electrical vehicles is presented in this study. The OCAT consists of a fictional clutch and a one-way clutch. The working principle of the OCAT is to shift automatically the speed ratio of the OCAT by automatic disengagement and engagement characters of the one-way clutch. Since torques in launch conditions that are generated by a motor highly oscillates, desired shift performances that can represent speed ratio changes of the OCAT also highly oscillates. A simplified dynamic model of launch conditions of the OCAT is built in this paper. The clutch controller based on an optimal control method is also proposed. Simulations and tests are carried out. The results of both simulation and test prove the dynamic model and control strategy build in the paper can be used to study the dynamic characters of the OCAT during launch.