Patent · US Active

Method for operating a transmission device of a vehicle drivetrain

US8465394B2 · kind B2 · utility

4Cited by

9References

7Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Ruben Cuppers · Schallstadt, DE
Werner Fuchs · Herrsching am Ammersee, DE
Thilo Schmidt · Meckenbeuren, DE

Key dates

Filing date	Jul 22, 2010
Grant date	Jun 18, 2013
Priority date	—
Expiry date	Aug 10, 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 of a vehicle drive-train that comprises frictional shifting elements and an interlocking shifting element. In the neutral operating condition of the transmission, and in the case of an operating condition variation of the vehicle drive-train in which, when it is required to establish the force flow in the transmission, the interlocking shifting element is to be changed from a disengaged to an engaged operating condition, by increasing the transmission capacities of at least two frictional shifting elements which have to be engaged for producing the force flow, a rotational speed difference in the area of the interlocking shifting element is determined, and a drive torque of a drive machine is adjusted to a level that brings the speed difference within a predefined range at which the interlocking shifting element is approximately synchronized and can therefore be engaged.

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