Method for the operation of a drivetrain

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 7867137
SERIAL NO

11811427

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Importance

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Abstract

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A method for operating a motor vehicle drivetrain with at least an automatic transmission and a drive motor. The automatic transmission includes at least five shift elements to transmit torque and/or power. In each of the forward and reverse gears, at least three shift elements are engaged and the remaining shift elements are disengaged. Two consecutive gearshifts are carried out through selection of the five shift elements. During a first gearshift, implemented as a multiple gearshift, a subsequent second gearshift, implemented as either a single or multiple gearshift, is prepared. During the first gearshift, a first shift element is disengaged, a second shift element is engaged, a third shift element is prepared for disengagement in a subsequent second gearshift and a fourth shift element is prepared for engagement. Further, during the first gearshift and the subsequent second gearshift, a fifth shift element is retained in at least a substantially engaged state.

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Patent Owner(s)

Patent OwnerAddress
ZF FRIEDRICHSHAFEN AGFRIEDRICHSHAFEN

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Popp, Christian Kressbronn, DE 79 565
Steinhauser, Klaus Kressbronn, DE 71 528

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