Method for controlling a drivetrain of a vehicle

A method for controlling a drivetrain of a vehicle, wherein the drive train comprises a combustion engine in drive connection with a dual clutch transmission, wherein the dual clutch transmission is provided with

• a normally closed input clutch, and
• a normally open input clutch,
• the normally closed input clutch connecting the combustion engine with a first input shaft and the normally open input clutch connecting the combustion engine with a second input shaft,
• wherein the first input shaft is in operative connection with a connection sleeve,
• wherein the connection sleeve is arrangeable in an engaged and a disengaged position, whereby, in the engaged position, the connection sleeve enables an operative connection between the first input shaft and a gearwheel and, in the disengaged position, the gearwheel is disconnected from the first input shaft, and
• wherein the connection sleeve is in a disengaged position when the engine is turned off, wherein the method is automatically initiated at a start of the engine, the method comprising
• starting the combustion engine,
• controlling the normally open input clutch and the normally closed input clutch to engaged or semi-engaged states such that both the first and the second input shaft reach a predetermined synchronised speed, and
• after both the first and the second input shaft reach the predetermined synchronised speed, opening the normally closed input clutch, and
• after determining that the connection sleeve has reached an essentially synchronous speed with the gearwheel, engaging the connection sleeve.