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:
Oct. 28, 2014
Filed:
Jul. 05, 2012
Mario Steinborn, Friedrichshafen, DE;
Roland Mair, Tettnang, DE;
Florian Schneider, Lindenberg, DE;
Jochen Breuer, Tettnang, DE;
Mario Steinborn, Friedrichshafen, DE;
Roland Mair, Tettnang, DE;
Florian Schneider, Lindenberg, DE;
Jochen Breuer, Tettnang, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A method of controlling a shift of an automated group gearbox having a multi-step main transmission and a trailing two-step range group. An input shaft of the main transmission is driven by a drive device. The main transmission and a range group have synchronization devices with shift clutches. Each synchronization device, for the main transmission, has two shift positions for respective gear ratio steps and a neutral position and the range group synchronization device has only two shift positions to shift between two gear ratios steps. To accelerate range shifts, when synchronizing the range group, the main transmission input shaft is synchronized by controlling external synchronization aids to a target rotational speed at which either after the synchronization and shifting of the gear ratio step of the range group or independently from the current synchronization condition of the range group, the target gear ratio is engaged in the main transmission.