Patent ID: 8423252

Claim:
Control method of shifting gear in an automatic manual transmission to pass from a current gear (A) to a successive gear (B); the automatic gear transmission comprises 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 comprises the steps of determining, when the clutch is at least partially closed, a target torque (T C-TAR ) that has to be transmitted through the clutch; determining, when the clutch is at least partially closed, a rotation speed target (ω E-TAR ) of the drive shaft of the engine; determining a target engine torque (T E-TAR ) of the engine according to the target torque (T C-TAR ) that has to be transmitted through the clutch and according to the rotation speed target (ω E-TAR ) of the drive shaft of the engine; and making the engine pursue the target engine torque (T E-TAR ) of the engine; determining, during a design phase, a model of the engine and of the transmission; using the model of the engine and of the transmission to determine in open-loop a first contribution (T E-TAR1 ) of the target engine torque (T E-TAR ) of the engine according to the target torque (T C-TAR ) that has to be transmitted through the clutch and according to the rotation speed target (ω E-TAR ) of the drive shaft of the engine; using a feedback control to determine in closed-loop a second contribution (T E-TAR2 ) of the target engine torque (T E-TAR ) of the engine according to the rotation speed target (ω E-TAR ) of the drive shaft of the engine and using the rotation speed target (ω E-TAR ) of the drive shaft of the engine as a feedback variable; and adding algebraically the first contribution (T E-TAR1 ) of the target engine torque (T E-TAR ) of the engine to the second contribution (T E-TAR2 ) of the target engine torque (T E-TAR ) of the engine in order to determine the target engine torque (T E-TAR ) of the engine.