Patent · US Active

Method for operating a drivetrain

US8858390B2 · kind B2 · utility

5Cited by

4References

10Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Peter Schiele · Kreßbronn, DE
Falko Platzer · Friedrichshafen, DE
Michael Sohler · Isny im Allgäu, DE

Key dates

Filing date	Nov 22, 2010
Grant date	Oct 14, 2014
Priority date	—
Expiry date	Apr 13, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/62
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A method of operating a drive train having a hybrid drive including a combustion engine and electric motor, a clutch located between the engine and the motor, a transmission, a starting element and a brake pedal. For electric crawling from a state in which the clutch is disengaged, the brake pedal is activated and the combustion engine is turned off, initially the starting element is brought to or maintained at a filling pressure. Next, the rotational speed of the electric motor is adjusted to be higher, by a defined slippage rotational speed, than a transmission side rotational speed. When this slippage is reached, the starting element is further engaged to create a crawl torque at the output. The electric motor continues at rotational speed control so that the slippage is maintained.

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