Patent ID: 11920675
Assignee: ZF FRIEDRICHSHAFEN AG
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 14:
15. A control unit for determining a tooth-on-tooth position between two shift-element halves (10, 11) of a form-locking shift element (A, F), the two shift-element halves (10, 11) bringable into engagement with each other in a form-locking manner during an engagement of the form-locking shift element (A, F), the control unit configured for:
monitoring a relative movement between the shift-element halves (10, 11) in an engagement direction with a sensor during an engagement process; and
detecting a tooth-on-tooth position when
the relative movement between the shift-element halves (10, 11) in the engagement direction measured by the sensor is zero within an actuating-travel range between the shift-element halves (10, 11) between a disengaged condition and an engaged condition of the shift element (A, F),
a ratio between an engagement force applied at the shift element (A, F) and a radial force acting on the shift-element halves (10, 11), which results from a torque applied at the shift element (A, F), is within a value range facilitating the tooth-on-tooth position, and
an actuating movement of the at least one movable shift-element half (10) in the engagement direction is detected by the sensor after a reduction of the engagement force, after an increase of the applied torque, or after both the reduction of the engagement force and the increase of the applied torque.