Patent ID: 8812200

Claim:
A method of determining an operating state of a form-locking shift element ( 8 ) of a transmission apparatus that, at least for changing an operating state between a disengaged operating state and an engaged operating state, is pressurized by a pressure-conducting region ( 5 ) of the transmission apparatus with an actuating pressure, the method comprising the steps of: providing a transmission apparatus with at least one shift element ( 8 ) that is pressurized by the pressure-conducting region ( 5 ) of the transmission apparatus; monitoring the pressure (p_sys) of the pressure conducting region ( 5 ) with a pressure sensor ( 9 ); checking whether the form-locking shift element ( 8 ) has changed to a requested operating state, depending on a progression of the pressure (p_sys_ist) of the pressure-conducting region ( 5 ) during the pressurization of the form-locking shift element ( 8 ) with actuating pressure for a change of the operating state; while pressurizing the form-locking shift element ( 8 ) with actuating pressure, determining an arising pressure change (Δp_sys) based on the progression of the pressure (p_sys_ist) of the pressure-conducting region ( 5 ), and depending thereupon, determining the flow disturbance (Δq), based upon which of an adjustment speed and a displacement path (X), in the region of the form-locking shift element ( 8 ).