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:
Sep. 14, 2021
Filed:
Oct. 25, 2017
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Karl Locher, Pfronstetten-Tigerfeld, DE;
Ahmet Macar, Friedrichshafen, DE;
ZF FRIEDRICHSHAFEN AG, Friedrichshafen, DE;
Abstract
The invention relates to a method for operating a vehicle drive train () comprising a prime mover (), comprising a transmission (), and comprising a driven end (). A friction-locking shift element () is provided, the power transmission capacity of which is variable and, with the aid of which, at least a portion of the torque transmitted in the vehicle drive train () can be transmitted between a transmission output shaft () and an area () of the driven end (). One shift-element half is operatively connected to the transmission output shaft () and the other shift-element half is operatively connected to the area () of the driven end (). The rotational speed of the transmission output shaft () is determined as a function of the rotational speed in the area () of the driven end () and also as a function of the rotational speed of the prime mover () and the ratio currently engaged in the area of the transmission (). In the event of a deviation between the rotational speed of the transmission output shaft () determined on the output end and the rotational speed of the transmission output shaft () determined on the transmission-input end, which is greater than or equal to a threshold value and/or an operating temperature in the area of the friction-locking shift element (), which is greater than or equal to a limiting value, measures reducing loads of the friction-locking shift element () are initiated.