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:
Dec. 03, 2024
Filed:
Jun. 21, 2022
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Mario Steinborn, Friedrichshafen, DE;
Thea Schlueter, Friedrichshafen, DE;
Frieder Norrenberg, Argenbühl, DE;
Richard Malínský, Tachov, CZ;
Otakar Šprdlík, Štáhlavy, CZ;
Martin Fajfr, Štěnovice, CZ;
Karel Veisheipl, Týn nad Vltavou, CZ;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A method for operating a motor vehicle drive train having a drive aggregate, an automated group transmission connected between the drive aggregate and a drive output, and a disconnect clutch connected between the drive aggregate and the group transmission. The group transmission has a plurality of sub-transmissions, including a main transmission, a splitter group upstream from the main transmission, and a range group downstream from the main transmission. When the disconnect clutch cannot be shifted to carry out a shifting operation in the group transmission, an emergency shifting program is activated. Shifting from a current gear to a target gear is carried out automatically, as a function of input rotation speed of the group transmission or as a function of rotation speed of the drive aggregate, while the disconnect clutch is closed and where the main transmission and/or the range group participate exclusively, but not the splitter group.