Patent ID: 8798881

Claim:
A method of operating a transmission device ( 1 ) comprising a plurality of friction-locking and form-locking shift elements (A to F) for obtaining different gear ratios (“ 1 ” to “R”), the method comprising the steps of: submitting a shift request for engaging a form-locking shift element (F) to a time delay (t 1 ), and the time delay (t 1 ) depending upon an operating state of the form-locking shift element (F) prior to a point in time of engagement (T 5 , T 8 ; T 9 ); assigning a differential rotational speed (n_diff_F) to the point in time of engagement (T 5 , T 8 ; T 9 ), and the differential rotational speed (n_diff_F) between shift element halves of the form-locking shift element (F) being within a differential rotational speed window required for the engagement of the form-locking shift element (F); ascertaining an initial gradient of either a transmission input speed or an equivalent rotational speed parameter (n_t) at a point of time (T 1 ) of the shift request; monitoring and comparing an actual gradient of the transmission input speed or the equivalent rotational speed parameter (n_t) with the initial gradient that was ascertained at the point of time (T 1 ) of the shift request; ascertaining an absolute deviation between the initial gradient and the actual gradient; and changing a period of the time delay (t 1 ) if the absolute deviation is greater than a threshold value.