Method for Operating a Drive Train of a Motor Vehicle

摘要

A method of operating a drive train of a motor vehicle is provided, wherein the drive train has a drive motor and an automatic or automated transmission connected between the drive motor and the drive wheels. The transmission automatically changes gear in an automatic mode. The transmission changes to a higher or lower gear in a manual mode on the basis of an up-shift or a down-shift requested by the driver via control element. At least in automatic mode, a coasting mode of the drive train, in which the operative connection between drive motor and drive wheels is separated, is engaged under defined operating conditions and the coasting mode is disengaged upon the driver requesting a downshift and the manual mode of the transmission is engaged. The coasting mode is maintained in automatic mode in the case of the driver requesting an up-shift during coasting mode.

主权项

1. A method of operating a drive train comprising a drive motor and an automatic or automated transmission coupled between the drive motor and drive wheels of a motor vehicle, wherein
the transmission automatically changes gear in an automatic mode of the transmission, the transmission is manually changed to a higher or lower gear dependent on an up-shift or a down-shift request by a driver via an operating element in a manual mode of the transmission, the method comprising the acts of: at least in the automatic mode, a shift of the transmission occurs in a presence of defined operating conditions to a coasting mode of the drive train in which an operative connection between the drive motor and the drive wheels is disengaged; when the driver requests a down-shift, the coasting mode is left and the transmission shifts to the manual mode of the transmission; and when the driver requests an up-shift in the coasting mode, the coasting mode is maintained in the automatic mode of the transmission.