Method for the operation of a transmission device in a vehicle drive train when a request is made to change gears

US9002603B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Jörg Arnold · Markdorf, DE
• Valentine Herbeth · Friedrichshafen, DE
• Georg Mihatsch · Gettorf, DE

Key dates

• Filing date: Nov 8, 2011
• Grant date: Apr 7, 2015
• Expiry date: Dec 14, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2200/2094
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method of operating a transmission of a vehicle drive-train when a gearshift from a current gear toward a target gear has been requested. The transmission having frictional shifting elements and at least one interlocking shifting element. If an actuating electrical current, equivalent to a closed operating condition of the frictional shifting element to be engaged, and an actuating electrical current, equivalent to an open operating condition of the interlocking shifting element to be disengaged, are determined while, at the same time, a closed operating condition of the interlocking shifting element to be disengaged is detected by a sensor, a fault is recognized. If the fault is recognized during a predefined test period, one or more selected shifting elements are disengaged and a force flow in the transmission is interrupted. Alternatively, by disengaging the frictional shifting element to be engaged, the current gear is engaged in the transmission.