Control of dry clutch engagement for vehicle launches via a shaft torque observer

Automated Manual Transmission vehicles are generally equipped with the servo-actuated clutch engagement system. In that system, shift quality depends on the engaging time and controlling the clutch normal force. It is therefore crucial to pay attention to the control performance in order to guarantee smooth engagement of the clutch. This article proposes the control architecture that consists of the speed control for synchronization and the torsion control for reducing shift shocks incorporating a shaft torque observer. The proposed control structure assures a fast engagement while preventing an abrupt change in vehicle acceleration at the same time.