Invention Grant
- Patent Title: Method for operating a friction-locking shift element of a transmission, and control unit
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Application No.: US18338458Application Date: 2023-06-21
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Publication No.: US11920646B2Publication Date: 2024-03-05
- Inventor: Philipp Kölbl , Michael Miller , Jonas Knör
- Applicant: ZF Friedrichshafen AG
- Applicant Address: DE Friedrichshafen
- Assignee: ZF Friedrichshafen AG
- Current Assignee: ZF Friedrichshafen AG
- Current Assignee Address: DE Friedrichshafen
- Agency: Dority & Manning, P.A.
- Priority: DE 2022206209.4 2022.06.21
- Main IPC: F16D48/06
- IPC: F16D48/06 ; F16D13/52 ; F16D13/64

Abstract:
A method for operating a friction-locking shift element of a transmission of a motor vehicle includes actuating the friction-locking shift element for engagement according to a pressure versus torque characteristic curve. The pressure versus torque characteristic curve has a first characteristic point (a touch point) and a second characteristic point (a contact point), defines a first characteristic curve range between the touch point and the contact point having a first functional dependence, and defines a second characteristic curve range at or after the contact point having a second functional dependence. Once the touch point is reached, the friction-locking shift element begins to transmit torque mainly due to drag torques. Whereas, once the contact point is reached, the friction-locking shift element begins to transmit torque mainly due to friction between shift-element halves of the friction-locking shift element.
Public/Granted literature
- US20230407926A1 Method for Operating a Friction-Locking Shift Element of a Transmission, and Control Unit Public/Granted day:2023-12-21
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