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 7892144
APP PUB NO 20070287588A1
SERIAL NO

11811207

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ATTORNEY / AGENT: (SPONSORED)

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 shifting elements to transmit torque and/or power. In each forward and reverse gear a maximum of two shifting elements are disengaged while the remaining shifting elements are engaged. Two consecutive gearshifts are carried out through selection of the five shifting 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 shifting element is disengaged, a second shifting element is engaged, a third shifting element is prepared for disengagement in a subsequent second gearshift and a fourth shifting element is prepared for engagement. Further, during the first gearshift and the subsequent second gearshift, a fifth shifting element is retained in at least a substantially engaged state.

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Patent Owner(s)

Patent OwnerAddress
ZF FRIEDRICHSHAFEN AGGERMANY FREDERIKSHAVN FRIEDRICHSHAFEN BADEN-WURTTEMBERG

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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