The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2016
Filed:
Dec. 06, 2011
Tobias Zollner, Lindau, DE;
Bernd Allgaier, Kressbronn, DE;
Clemens Kuhn, Eriskirch, DE;
Patrick Peter, Kressbronn, DE;
Lorenz Fehrenbach, Friedrichshafen, DE;
Holger Bacher, Lindau, DE;
Tobias Zollner, Lindau, DE;
Bernd Allgaier, Kressbronn, DE;
Clemens Kuhn, Eriskirch, DE;
Patrick Peter, Kressbronn, DE;
Lorenz Fehrenbach, Friedrichshafen, DE;
Holger Bacher, Lindau, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A method of operating a drive-train of a hybrid vehicle which comprises at least a hybrid drive with an internal combustion engine and an electric machine, an automatic or automated change-speed transmission connected between the hybrid drive and a drive output, and a clutch connected between the internal combustion engine and the electric machine. When starting the internal combustion engine from a purely electric driving mode, the clutch is initially disengaged. To start the internal combustion engine, the clutch is at least partially engaged and the internal combustion engine is drag-started by the electric machine, and, in parallel with starting the internal combustion engine, a downshift in the transmission is initiated once a rotational speed of the internal combustion engine reaches or exceeds an applicable threshold value.