Method for operating a transmission device with a plurality of friction-locking and positive-locking shifting elements

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 (t1), and the time delay (t1) depending upon an operating state of the form-locking shift element (F) prior to a point in time of engagement (T5, T8;
• T9);
• assigning a differential rotational speed (n_diff_F) to the point in time of engagement (T5, T8;
• T9), 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 (T1) 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 (T1) of the shift request;
• ascertaining an absolute deviation between the initial gradient and the actual gradient;
• and
• changing a period of the time delay (t1) if the absolute deviation is greater than a threshold value.