Patent · US Active

Method for operating a transmission with at least one positive-locking shifting element

US8483918B2 · kind B2 · utility

4Cited by

7References

11Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

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

Key dates

Filing date	Mar 31, 2010
Grant date	Jul 9, 2013
Priority date	—
Expiry date	Nov 4, 2030

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2200/2094
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A method of operating a transmission (1) with at least one interlocking shift element (F) having at least two shift element halves that can be brought into interlocked engagement with one another. When a command is received to close the interlocking shift element (F), a current rotational speed difference between the shift element halves of the interlocking shift element (F) and the current positions of the shift element halves are determined. If the rotational speed difference is smaller than a first speed difference threshold value and if a tooth-on-tooth position has occurred at the interlocking shift element (F), then to release the tooth-on-tooth position, the actuation force is changed to a release level at which a rotational speed difference above a second speed difference threshold value is produced between the shift element halves.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.