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. 31, 2020
Filed:
Jan. 17, 2019
Zf Friedrichshafen Ag, Friedrichshafen, DE;
ZF FRIEDRICHSHAFEN AG, Friedrichshafen, DE;
Abstract
A method () for the open-loop control of a gearbox () that comprises an input shaft () and a first and a second proportionally controllable shift element (A-F) is provided. The method includes disengaging () the first shift element (A-F) according to a first control profile and engaging () the second shift element (A-F) according to a second control profile. The method also includes cyclically performing the following during the disengagement and the engagement: determining () a difference between the rotational speed of the input shaft () and a rotational speed which the input shaft () assumes when the second shift element (A-F) has been completely engaged; determining () a gradient of the difference; and adapting () the first control profile on the basis of the gradient.