Vehicle drivetrain and method of operation therefore

Disclosed is a drivetrain for a vehicle, comprising an internal combustion engine 1, a sensor 3 for monitoring rotation of a crankshaft 16 of the combustion engine and a clutch 12 coupling the combustion engine 1 to an output shaft 13 of the drivetrain. An engine controller 8 controls fuel injectors 4 associated with cylinders 2 of the combustion engine 1 based on operating parameters. An update controller 11 is provided for setting the operating parameters based on the output of the crankshaft sensor 3. A clutch controller 14 controls torque transmission from the combustion engine 1 to the output shaft 13 by said clutch 12. The controllers 8, 11, 14 support a drive mode in which the engine is on while the clutch 12 is closed, a sailing mode in which the engine is off while the clutch 12 is open, and a switchover from the drive mode to the sailing mode or vice versa, said switchover comprising a transition phase in which at least one of the Injectors 4 supplies fuel to its respective cylinder 2 while the clutch 12 is partially open. The update controller 11 is configured to set the operation parameters of the fuel injectors 4 based on data obtained by the sensor 3 during the transition phase. The arrangement provides a smooth engagement of power when transitioning between engine modes. An associated method is also disclosed