In this paper a gearshift controller for use in a twin clutch transmission is developed. The controller employs an integrated powertrain strategy involving control of clutch slip, engine-assisted synchronisation and control of transmission output shaft torque during a gearshift. First a detailed dynamic model of engine and drivetrain including twin clutch transmission and hydraulic clutch actuation is developed. Then a control algorithm is presented for application to upshifts. The controller performance is verified based on simulation results for different operating points of the powertrain. Also the advantage over conventional gearshift control strategies is demonstrated. In particular emphasis is laid on the robustness of the controller against changes in the gradient of the friction coefficient with clutch slipping speed.
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