Patent ID: 7771315

Claim:
A method of controlling an automatic transmission during a downshift procedure by utilizing braking to achieve transmission synchronization when a synchronous speed of rotation (SD) for a new transmission gear-stage is lower than a no-load speed of rotation (LD) of a drive motor connected to the automatic transmission, the method comprising the steps of: maintaining a transmission speed of rotation (GED) constantly below a no-load speed of rotation (LD) of a drive motor connected to the automatic transmission; activating a transmission brake; releasing a signal for a gear-stage shift while the transmission input speed of rotation (GED) is declining but prior to the transmission input speed of rotation (GED) reaching an upper speed of rotation value (FO) of a predetermined speed of rotation window (F), with the rotation window (F) encompassing the synchronous speed of rotation (SD); and activating a gear-stage engagement actuator for engagement of the new transmission gear-stage, if the transmission input speed of rotation (GED) reaches a predetermined engagement speed of rotation window (F).