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:
Apr. 06, 2010
Filed:
Oct. 22, 2003
Manfred Guggolz, Rutensheim, DE;
Werner Hillenbrand, Neuffen, DE;
Xiayoi Liu, Winneden, DE;
Detlef Schnitzer, Denkendorf, DE;
Markus Veit, Pliezhausen, DE;
Manfred Guggolz, Rutensheim, DE;
Werner Hillenbrand, Neuffen, DE;
Xiayoi Liu, Winneden, DE;
Detlef Schnitzer, Denkendorf, DE;
Markus Veit, Pliezhausen, DE;
Daimler AG, Stuttgart, DE;
Abstract
A method for operation of a drive train having a drive machine and an automatic, unsynchronized gearwheel variable-speed transmission, which can be connected to the drive machine by using an automatic clutch is described. A control device carries out a selection process as a function of vehicle parameters and/or operating variables of the motor vehicle to determine whether a gear change of the unsynchronized gearwheel variable-speed transmission will be carried out with the clutch engaged or disengaged. To ensure reliable operation of the motor vehicle, a gear change is carried out with the clutch disengaged in a time interval after initial starting up of the drive train and/or after starting of the drive machine and/or when a malfunction is identified in a component in the drive train.