Patent · US Active

Method for operation of a drive train

US8521355B2 · kind B2 · utility

0Cited by

4References

3Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Bernd Allgaier · Kreßbronn, DE
Friedrich Tenbrock · Tettnang, DE
Michael Gromus · Friedrichshafen, DE

Key dates

Filing date	Jul 16, 2009
Grant date	Aug 27, 2013
Priority date	—
Expiry date	Oct 19, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S903/902
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A method of operating a drive train of a motor vehicle in which the drive train comprises at least a hybrid drive with an internal combustion engine and an electric motor, a clutch connected between the combustion engine and the electric motor, a transmission arranged between the hybrid drive and a drive output, and preferably a transmission-internal or -external starting element. When the combustion engine is entrained into motion with the help of the electric motor, the clutch connected between the internal combustion engine and the electric motor is partially engaged to a slipping condition where the clutch transmits a constant torque, and during this entrainment, and comparing an actual gradient of the combustion engine's speed produced with a nominal gradient of the combustion engine's speed. When the actual gradient is greater than the nominal gradient, the method concludes that the combustion engine is started and actively providing torque.

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