Interrelated power delivery controls – including engine control – Transmission control – With clutch control
Reexamination Certificate
2011-08-09
2011-08-09
Ho, Ha D. (Department: 3655)
Interrelated power delivery controls, including engine control
Transmission control
With clutch control
C477S086000
Reexamination Certificate
active
07993241
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.
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International Preliminary Report on Patentability; PCT Application No. PCT/EP2008/006111, Filing Date: Jul. 25, 2008.
Ahne Raphael
Buerkle Joachim
Himmelsbach Mathias
Kalisch Tobias
Leibbrand Uwe
GETRAG Getriebe-und Zahnradfabrik Hermann Hagenmeyer GmbH &
Ho Ha D.
Knobbe Martens Olson & Bear LLP
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