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:
Aug. 09, 2011
Filed:
Jan. 21, 2010
Reinhard Schaarschmidt, Illingen, DE;
Joachim Buerkle, Benningen, DE;
Mathias Himmelsbach, Heilbronn, DE;
Roland Pfister, Schramberg, DE;
Oliver Ottinger, St. Georgen, DE;
Andreas Schaefer, Abstatt, DE;
Uwe Leibbrand, Ingersheim, DE;
Raphael Ahne, Ludwigsburg, DE;
Tobias Kalisch, Villingen-Schwenningen, DE;
Reinhard Schaarschmidt, Illingen, DE;
Joachim Buerkle, Benningen, DE;
Mathias Himmelsbach, Heilbronn, DE;
Roland Pfister, Schramberg, DE;
Oliver Ottinger, St. Georgen, DE;
Andreas Schaefer, Abstatt, DE;
Uwe Leibbrand, Ingersheim, DE;
Raphael Ahne, Ludwigsburg, DE;
Tobias Kalisch, Villingen-Schwenningen, DE;
GETRAG Getriebe-und Zahnradfabrik Hermann Hagenmeyer GmbH & Cie KG, Untergruppenbach, DE;
Abstract
A method for controlling shift process in dual-clutch gearbox having dual-clutch gearbox input shaft connected to a drive engine, having two friction clutches and two partial gearboxes, comprising detecting demand for a shift from source gear into target gear, the source gear and target gear assigned to first partial gearbox; opening friction clutch assigned to first partial gearbox and closing friction clutch assigned to other partial gearbox to transmit drive power via intermediate gear of other partial gearbox; disengaging source gear and temporarily conducting a pressure-exertion process in friction clutch assigned to the first partial gearbox before engagement of target gear, with rotational speed of first partial gearbox being reduced due to the pressure-exerting operation according to drag torque, opening friction clutch assigned to other partial gearbox and closing friction clutch assigned to first partial gearbox to transfer drive power to the target gear without an interruption in tractive force.