Method for operating a transmission device having a plurality of friction-fit shift elements and at least one form-fit shift element

US8840517B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Valentine Herbeth · Friedrichshafen, DE
• Jörg Arnold · Markdorf, DE
• Georg Mihatsch · Gettorf, DE
• Andreas Schmidt · Braunschweig, DE
• Thilo Schmidt · Meckenbeuren, DE
• Gabor Diosi · Friedrichshafen, DE
• Christoph Margraf · Markdorf, DE

Key dates

• Filing date: Dec 21, 2010
• Grant date: Sep 23, 2014
• Expiry date: Jun 11, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2306/46
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method of operating a transmission device (3) having a plurality of frictionally engaging shift elements (B, C, D and E) and at least one form-locking shift element (A, F) for implementing different transmission ratios. Upon a requested change in operating state of the transmission device (3), the at least one form-locking shift element (A) is transferred into an at least nearly load-free state, during which the form-locking shift element (A) is transferred from an engaged to a disengaged operating state by increasing the transfer capability of at least one frictionally engaging shift element (E), which is not engaged in the power flow of the transmission device (3) either to represent the present operating state or to represent the requested operating state.