Patent ID: 6939267

Claim:
A method for controlling a gear release in an automated multi-speed drive in a vehicle drive having a drive motor and a separating clutch, that is positioned between the drive motor and separating clutch and that can be optionally opened or closed by a clutch plate whereby a torque of the drive motor is reduced at a start of a shifting process so that shift elements to be decoupled during the gear release can be decoupled by an actuator with little shift power and the torque of the drive motor is not increased involuntarily by engaging the clutch, comprising the steps of: continuously determining a current vehicle acceleration (a veh ); determining a current initial vehicle acceleration (a start ) at the start of the shifting process; determining a first and second vehicle acceleration value (a gear — release , a clutch — engage ), dependent on the initial vehicle acceleration (a start ), a fuel injection quantity EM supplied to the drive motor and the selected actual gear; constantly comparing the current vehicle acceleration (a veh ) with the first and the second vehicle acceleration values (a gear — release , a clutch — engage ); applying a shift force from the actuator on the shift elements to be decoupled when the current vehicle acceleration (a veh ) reaches the first acceleration value (a gear — release ) or drops below it; and opening the clutch with the clutch plate when the current vehicle acceleration value (a veh ) reaches or drops below the second vehicle acceleration value (a clutch — engage ) whereby at the latest the actuator applies a shift power to the shift elements to be decoupled.