Control method of shifting gear in an automatic manual transmission having a twin-clutch gearbox

1) A control method of shifting gear in an automatic manual transmission having a twin-clutch gearbox to pass from a current gear (A) to a successive gear (B);

• the automatic manual transmission comprising a twin-clutch gearbox presenting two primary shafts, at least a secondary shaft connected to driving wheels and two clutches, each of which is interposed between a drive shaft of an engine and a corresponding primary shaft, the control method comprises the steps of:
• receiving a gear shifting command;
• opening a first clutch associated to the current gear (A);
• closing a second clutch which is associated to the successive gear (B) and starts transmitting torque after a delay time (TR) interval has elapsed since the beginning of the closure;
• wherein opening the first clutch includes beginning opening of the first clutch, which implies decreasing the torque transmitted by the first clutch (16A), before the second clutch starts transmitting torque, so that the first clutch decreases the torque transmitted to the driving wheels before the second clutch starts transmitting torque to the driving wheels.