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. 12, 2013
Filed:
May. 05, 2009
Christian Popp, Kressbronn, DE;
Klaus Steinhauser, Kressbronn, DE;
Jorg Arnold, Immenstaad, DE;
Valentine Herbeth, Friedrichshafen, DE;
Christian Popp, Kressbronn, DE;
Klaus Steinhauser, Kressbronn, DE;
Jorg Arnold, Immenstaad, DE;
Valentine Herbeth, Friedrichshafen, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A method for operating a vehicle drivetrain () having a drive motor (), a transmission () and a drive output (). When a gear ratio change is called for in the transmission (), between an actually engaged gear and a target gear, one of a frictional or an interlock-type shift element is engaged in a flow of force in the vehicle drivetrain () and the other of an interlock-type or a frictional shift element is disengaged from the flow of force in the vehicle drivetrain (). An actual speed that is at least equivalent to a transmission input speed is monitored and an actuation pressure of the frictional shift element involved in the shift operation and/or a torque of the drive motor () is/are varied to change the actual speed to a nominal speed.