| 摘要 |
A method is described for operating a vehicle drive train (1) with a drive machine (2) and with a transmission device (3) during a coast upshift, during which at least one interlocking shift element (6) that is engaged in the force flow of the transmission device (3) to produce the gear ratio to be disengaged is disengaged from the force flow and also frictional shift element (5) that has to be engaged in the force flow of the transmission device (3) to obtain the gear ratio to be engaged is engaged in the force flow. According to the invention, when a shift command is given for a gear ratio change, a torque applied at the interlocking shift element (6) to be disengaged is reduced at least approximately to zero by a defined engine intervention and the interlocking shift element (6) is then disengaged from the force flow of the transmission device (3).
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