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:
Sep. 22, 2009
Filed:
May. 24, 2006
Volker Pichmann, Braunschweig, DE;
Volker Pichmann, Braunschweig, DE;
Volkswagen Aktiengesellschaft, Wolfsburg, DE;
Abstract
A torque transfer device in a motor vehicle, used for variable transfer of torque from a first shaft associated with a first wheel pair to a second shaft associated with a second wheel pair. A coupling unit facilitates variable torque-transferring coupling of the first and second shaft. The coupling unit has a first coupling element rotationally connected to the first shaft and a second coupling element connected to the second shaft. The elements cooperate with each other or are capable of cooperating with each other in order to transfer torque. A controllable adjusting device adjusts a strength of the interaction between the coupling elements by adjusting a relative position and/or a mechanical contact pressure. A control device controls the adjustment. The control device includes a data processing unit for calculating a first control signal on the basis of a plurality of input signals according to predefined rules and for controlling the adjusting device. A second control signal is superimposed on the first control signal. The second control signal acts as an indication of the difference in rotational speeds of the first and second shafts. A change in the second control signal on the basis of a change of this difference caused by the driving situation is chronologically in advance of a change of the first control signal caused by the same driving situation.