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. 21, 2020
Filed:
Jan. 17, 2019
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Harald Stehle, Tettnang, DE;
Günther Maier, Meckenbeuren, DE;
Christian Villing, Friedrichshafen, DE;
ZF FRIEDRICHSHAFEN AG, Friedrichshafen, DE;
Abstract
A gearbox () includes an input shaft (), which is connected to a drive source, and a first and a second proportionally controllable shift element (A-F). A method () for open-loop control of the gearbox () includes: determining () an absolute torque demand () on the drive source on the basis of a profile controlled by way of an open-loop system () and a profile controlled by way of a closed-loop system (); determining () whether the absolute torque demand () threatens to exceed a predetermined threshold value (); and, in response, reducing () the portion controlled by way of the closed-loop system ().