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. 24, 2012
Filed:
Dec. 07, 2009
Rupert Kramer, Friedrichshafen, DE;
Marcus Gansohr, Salem, DE;
Johannes Kemler, Bermatingen, DE;
Franz Bitzer, Friedrichshafen, DE;
Rainer Petzold, Friedrichshafen, DE;
Peter Herter, Ravensburg, DE;
Rupert Kramer, Friedrichshafen, DE;
Marcus Gansohr, Salem, DE;
Johannes Kemler, Bermatingen, DE;
Franz Bitzer, Friedrichshafen, DE;
Rainer Petzold, Friedrichshafen, DE;
Peter Herter, Ravensburg, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A method of monitoring a hydraulic or pneumatic transmission control system, which comprises a pressure supply unit with a conduit directing a pressure medium under a supply pressure, and an actuating member for a clutch control element of a friction clutch. The actuating member has a pressure space which can be connected by a clutch control valve to the conduit, and in which the supply pressure is determined by a pressure sensor that can be connected to the conduit. The method includes the steps of determining the supply pressure by the pressure sensor, given that briefly opening the clutch control valve produces a pressure increase and/or a pressure gradient of the control pressure in the pressure space, and the currently existing supply pressure can be calculated from the control pressure, the pressure increase and/or the pressure gradient.