Method for controlling gear-shifting processes of a powershift gearbox and corresponding powershift gearbox
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United States of America Patent
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May 6, 2008
Grant Date -
Jan 26, 2006
app pub date -
Mar 31, 2005
filing date -
Oct 4, 2002
priority date (Note) -
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Abstract
A method for controlling gear-shifting processes of a powershift gearbox which can be coupled to a drive motor and has gear steps including two friction clutches and a plurality of clutches, and at least one gearbox actuator for actuating the gear steps. The method includes the following steps: the torque of the drive motor is received by the new friction clutch associated with the new gear step to be engaged; before the disengagement of the old gear step and before or during the torque reception, a pre-determined pre-tensioning force is applied to the clutch of the old gear step by the gearbox actuator; and the old gear step is disengaged when the motor torque and the clutch torque are balanced.
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