Patent · US Active

Method and control device for operating a transmission

US10920876B2 · kind B2 · utility

0Cited by

1References

11Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Michael Sohler · Isny im Allgäu, DE
Magnus Stiefenhofer · Amtzell, DE
Tobias Hartmann · Koblenz, DE

Key dates

Filing date	Mar 13, 2018
Grant date	Feb 16, 2021
Priority date	—
Expiry date	Dec 26, 2038

Classification

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

Abstract

A method for operating a drivetrain of a motor vehicle includes elevating a system pressure acting on a plurality of shift elements (A, B, C, D, E, F) when one of at least one positively locking shift element (A, F) is closed in a force-locking-free state, increasing a torque output by a drive assembly (15) and then subsequently reducing the torque output by the drive assembly (15) while the system pressure is elevated by an intervention with the drive assembly (15), and reducing the system pressure after reducing the torque output by the drive assembly (15). The one of the at least one positively locking shift element (A, F) closed in the force-locking-free state or another one of the at least one positively locking shift element (A, F) is opened while the system pressure is elevated and the torque output by the drive assembly (15) changes.

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