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. 07, 2015
Filed:
Apr. 05, 2012
Thilo Schmidt, Meckenbeuren, DE;
Valentine Herbeth, Friedrichshafen, DE;
Klaus Steinhauser, Kressbronn, DE;
Jorg Arnold, Immenstaad, DE;
Thilo Schmidt, Meckenbeuren, DE;
Valentine Herbeth, Friedrichshafen, DE;
Klaus Steinhauser, Kressbronn, DE;
Jorg Arnold, Immenstaad, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A method of determining a fill current value of at least one frictionally engaging shift element of an automatic transmission. The automatic transmission includes a hydrodynamic converter at which a speed ratio arises and an output shaft. In a control sequence, with a stationary output shaft, the speed ratio is influenced by changing a control current, and the fill current value is determined from the progression of the speed ratio arising during the control sequence, in conjunction with the progression of the control current.