Procedure for operating a transmission device, particularly a 9-speed-transmission

A method of operating a transmission device (1) which is adjustable to various operating states by actuating shift elements (A to F), at least one of the shift elements (A, F) is a form-locking shift element which is adjusted, from an engaged operating state to a disengaged operating state, so as to implement a defined operating state of the transmission device (1) during which a power flow between a transmission input shaft (2) and a transmission output shaft (3) is either present or interrupted, a sensor device (22) is associated with the form-locking shift element (A, F), an operating state of the form-locking shift element (A, F) is determinable by the sensor device and, if there is a request to disengage the form-locking shift element (A, F), a disengagement control signal (IF) is generated and the form-locking shift element (A, F) is actuated in a direction of disengagement, depending on the disengagement control signal (IF), the method comprising the steps of:

• transferring the transmission device (1) to a safe operating state in which at least the transmission output shaft (3) can rotate, when at least one of:
• an actuating pressure which can change the operating state of the form-locking shift element is determined in the region of the sensor device (22) even though a disengagement control signal (IF) was not generated, and
• the sensor device (22) is associated with at least two form-locking shift elements (A, F) and the form-locking, shift elements (A, F) and are subjected to actuating pressure in order to implement a requested operating state change.

A method of operating a 9-speed transmission device (1) which is shiftable to various operating states by actuating shift elements (A to F), at least one of the shift elements (A, F) is a form-locking shift element and is engageable and disengageable so as to implement a defined operating state of the transmission device (1) during which a power flow, between a transmission input shaft (2) and a transmission output shaft (3), is either present or interrupted, a sensor device (22) associated with the form-locking shift element (A, F) determines an operating state of the form-locking shift element (A, F) and, if a request to disengage the form-locking shift element (A, F) is detected, a disengagement control signal (IF) is generated and the form-locking shift element (A, F) is actuated in disengagement direction, depending on the disengagement control signal (IF), the method comprising the steps of:

• shifting the transmission device (1) to a safe operating state in which at least the transmission output shaft (3) is rotatable, when at least one of:
• the sensor device (22) determines an actuating pressure that is sufficient to change the operating state of the form-locking shift element even though no disengagement control signal (IF) is generated, and
• when the sensor device (22) is associated with at least two form-locking shift elements (A, F) and the at least two form-locking shift elements (A, F) are subjected to an actuating pressure that is sufficient to implement a requested operating state change.