Patent · US Active

Method for actuating a shifting operation in an automatic transmission of a utility vehicle

US8452497B2 · kind B2 · utility

1Cited by

7References

8Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Ulrich Reith · Schlier, DE
Werner Wolfgang · Ravensburg, DE
Bertram Wengert · Markdorf, DE
Maik Wurthner · Friedrichshafen, DE

Key dates

Filing date	Jun 18, 2009
Grant date	May 28, 2013
Priority date	—
Expiry date	Apr 17, 2030

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2061/161
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A method of controlling a shifting operation in an automatic transmission of a commercial vehicle. A targeted gear and an associated target rotational speed are determined, via a transmission control, depending on predetermined parameters, and the shifting operation is executed upon reaching a determined shifting rotational speed. A shift interlock is activated, at least temporarily, during a downshifting operation when, upon reaching the shifting rotational speed, the determined target rotational speed lies below a predetermined rotational speed limit.

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