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:
Oct. 07, 2014
Filed:
Nov. 24, 2010
Martin-joachim Bader, Mochenwangen, DE;
Karl Locher, Pfronstetten-Tigerfeld, DE;
Robert Gronner, Horgenzell, DE;
Olaf Moseler, Werneck, DE;
Markus Terwart, Thundorf, DE;
Michael Vollmann, Schweinfurt, DE;
Martin-Joachim Bader, Mochenwangen, DE;
Karl Locher, Pfronstetten-Tigerfeld, DE;
Robert Gronner, Horgenzell, DE;
Olaf Moseler, Werneck, DE;
Markus Terwart, Thundorf, DE;
Michael Vollmann, Schweinfurt, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A method of operating a clutch serving as a shift element and/or starting clutch of a drive train. During engagement, the clutch will be filled by a fast filling up to a defined minimum pressure. The fast filling is at least subdivided into two phases comprising a basic filling phase and an extension and/or a cutout phase. At the end of the basic filling phase, the actual clutch pressure is measured, and then, when the actual clutch pressure is equal to or larger than the minimum pressure, the extension and/or cutout phase is activated immediately following the basic filling phase. When the actual clutch pressure is lower than the minimum pressure, activation of the extension and/or the cutout phase is at least delayed by a pressure holding phase and, if necessary, by a pressure surplus phase.