Method for the operation of a drivetrain

Details Method for the operation of a drivetrain Method for the operation of a drivetrain

2011-01-11

2011-01-11

Young, Edwin A (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C475S121000

Reexamination Certificate

active

07867137

ABSTRACT:
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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