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:
Mar. 27, 2018
Filed:
Nov. 03, 2016
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Peter Schiele, Kressbronn, DE;
ZF FRIEDRICHSHAFEN AG, Friedrichshafen, DE;
Abstract
A method for operating a vehicle drive train includes operating the vehicle drive train with a drive unit switched on, with the drive unit connected to an output by a transmission, and with a positive-locking shifting element open. In response to a coasting operating state request for the vehicle drive train and a rotational speed of a transmission output being greater than a threshold, the drive unit is switched off and power flow between the drive unit and the output is interrupted by opening at least one of a plurality of frictional-locking shifting elements. The method also includes closing the positive-locking shifting element during the coasting operating state and no later than a leave coasting operating state request.