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:
Jan. 21, 2020
Filed:
May. 18, 2017
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Peter Schiele, Kressbronn, DE;
Johannes Brockmann, Lindau, DE;
ZF FRIEDRICHSHAFEN AG, Friedrichshafen, DE;
Abstract
A method for operating a vehicle drivetrain () includes proceeding, in the presence of the demand for activation of the engine start-stop function of the vehicle drivetrain () and a simultaneously shut-down drive machine (), from an operating state of the vehicle drivetrain () during which a sailing operating function of the vehicle drivetrain () is active, during which the drive machine () is decoupled from the drive output (), during which the positively engaging shift element (F) is open and during which a rotational speed (n_ab) of the drive output () is higher than a defined rotational speed at which a rotational speed difference between shift element halves of the positively engaging shift element (F) lies within a rotational speed range within which the positively engaging shift element (F) is transferrable into the closed operating state, and actuating the positively engaging shift element (F) in a closing direction no later than when the defined rotational speed is reached.