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A novel type of automatic transmission is presented in this paper. The transmission consists of a fiction clutch and a one-way clutch, which is named as One-way Clutch Assistant Transmission. The working principle of this type of transmission is shifting automatically by automatic disengagement and engagement characters of the one-way clutch. The structure of the transmission is similar as Manual Transmission, when it is in the condition of launch. A simplified dynamic model of launch is built in this paper. The clutch controller based on 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 OCT during launch.

Optimal Clutch Control during Launch on the One-way Clutch Assistant Transmission