Patent · US Active

Method for operating a vehicle drivetrain

US8394000B2 · kind B2 · utility

7Cited by

6References

17Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Christian Popp · Kreßbronn, DE
Klaus Steinhauser · Kreßbronn, DE
Jörg Arnold · Markdorf, DE
Valentine Herbeth · Friedrichshafen, DE

Key dates

Filing date	May 5, 2009
Grant date	Mar 12, 2013
Priority date	—
Expiry date	Oct 21, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/1926
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A method for operating a vehicle drivetrain (1) having a drive motor (9), a transmission (10) and a drive output (2). When a gear ratio change is called for in the transmission (10), between an actually engaged gear and a target gear, one of a frictional or an interlock-type shift element is engaged in a flow of force in the vehicle drivetrain (1) and the other of an interlock-type or a frictional shift element is disengaged from the flow of force in the vehicle drivetrain (1). An actual speed that is at least equivalent to a transmission input speed is monitored and an actuation pressure of the frictional shift element involved in the shift operation and/or a torque of the drive motor (9) is/are varied to change the actual speed to a nominal speed.

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