Method for controlling the transfer of torque of a force-fitting shift element

US9709159B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Christoph Köhler · Bodolz, DE
• Frank Deprez · Freising, DE

Key dates

• Filing date: Jun 11, 2016
• Grant date: Jul 18, 2017
• Expiry date: Jun 11, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S903/951
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for controlling torque transfer of a force-fitting shift element includes controlling a closing pressure at least temporarily upon presence of a closing request for the force-fitting shift element and when a prevailing system pressure of the hydraulic circuit is above a threshold value for the system pressure. The closing pressure is controlled in a manner that is different than upon the presence of the closing request for the force-fitting shift element and when the prevailing system pressure is below the threshold value for the system pressure.