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. 30, 2007
Filed:
Aug. 16, 2003
Detlef Baasch, Friedrichshafen, DE;
Christoph Pelchen, Tettnang, DE;
Barbara Schmohl, Friedrichshafen, DE;
Unal Gazyakan, Friedrichshafen, DE;
Detlef Baasch, Friedrichshafen, DE;
Christoph Pelchen, Tettnang, DE;
Barbara Schmohl, Friedrichshafen, DE;
Unal Gazyakan, Friedrichshafen, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
Disclosed is a method for controlling a drive train () of a motor vehicle, especially an off-road vehicle, comprising a drive engine (), a multi-group transmission (), an output and a control device. The multi-group transmission () consists of at least one automatic gearbox () and a downstream range-change unit (). When a modification occurs in the multiplication of the range-change unit (), a) the drive train is relieved by modifying the torque of the drive engine (), a shift element () to be switched off in said range-change unit () is disconnected, c) a shift element () to be switched on in said range-change unit is synchronized and switched on and d) a multiplication of the automatic gearbox () is modified in such a way that the modification of the multiplication of the multi-group transmission () is smaller than a single modification of the multiplication of the range-change unit (). A rotational speed of the drive engine () is adjusted by a modification in the transmissibility of at least one shift element of the automatic gearbox () to a coupling rotational speed equivalent to the adjusting multiplication of the multi-group transmission () at which the shift element to be switched on in the range-change unit () is synchronous.