Patent ID: 8825325

Claim:
A control method for closing a clutch in an automatic manual transmission during a gear shifting to pass from a current gear (A) to a successive gear (B); the automatic gear transmission comprising a gearbox, which is provided with at least one primary shaft and at least one secondary shaft connected to driving wheels, and at least one clutch, which is interposed between the primary shaft of the gearbox and a drive shaft of an engine; the control method comprising, when, during the closing of the clutch, the rotation speed (ω E ) of an engine side of the clutch is close to the rotation speed (ω B ) of a gearbox side of the clutch, the steps of: determining, by a transmission control unit, a speed difference (Δω) between the rotation speed (ω E ) of the engine side of the clutch and the rotation speed (ω B ) of the gearbox side of the clutch; determining, by the transmission control unit, an acceleration target (α TAR ) as a function of the speed difference (Δω) so that the acceleration target (α TAR ) progressively decreases as the speed difference (Δω) decreases; determining, by the transmission control unit, an acceleration (α) by deriving in time the speed difference (Δω); determining, by the transmission control unit, an acceleration error (εα) by comparing the acceleration (α) with the acceleration target (α TAR ); determining, by the transmission control unit, a target torque (T CB-TAR ) to be transmitted through the clutch according to the acceleration error (εα) and using a PID regulator set to cancel the acceleration error (εα); and controlling a clutch actuator in association with the target torque (T CB-TAR ).