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. 18, 2008
Filed:
Aug. 18, 2003
Christoph Pelchen, Tettnang, DE;
Detlef Baasch, Friedrichshafen, DE;
Barbara Schmohl, Friedrichshafen, DE;
Ünal Gazyakan, Friedrichshafen, DE;
Christoph Pelchen, Tettnang, DE;
Detlef Baasch, Friedrichshafen, DE;
Barbara Schmohl, Friedrichshafen, DE;
Ünal Gazyakan, Friedrichshafen, DE;
ZF Friedrichshafen AG, Friedrichshfen, DE;
Abstract
A method for controlling of a drive train of a vehicle having a multi-group transmission, an output mechanism and a control apparatus for the regulation of the drive train. The multi-group transmission consists of an automatic transmission and a range group. To change the ratio of the range group the drive train is relieved of load; a shifting element of the range group is closed; a shifting element of the range group is synchronized and opened; and a ratio of the automatic transmission is so altered that a change of the ratio of the multi-group transmission is less than in a case of an individual alteration of the ratio of the range group.