Multi-group transmission of a motor vehicle

Abstract

The invention relates to a multi-group transmission of a motor vehicle with at least two transmission groups (2, 3) arranged in a drive train, in which the means for switching an intermediate gear are provided, in order to diminish or avoid interruptions in tractive force during gear changes. A planetary transmission (41) is arranged between a first transmission group (2) and a second transmission group (3), in order to enable gear changes without interruptions in tractive force with a variably selectable intermediate gear, as well as efficient operation that involves as little wear as possible, whereby a transmission input shaft (17) can be brought into a functional connection with a transmission main shaft (30) via the planetary transmission (41). According to a method of operating the multi-group transmission, a functional connection is established between a transmission input shaft (17) and a transmission main shaft (30), in order to switch an intermediate gear with the help of a planetary transmission (41) which can be engaged by means of the associated clutches (46, 47), so that at least one main group (3) is load-free, when a starting element (7) arranged between a drive motor and the transmission main shaft (17) is at least partially closed, an engaged initial gear is disengaged, the rotational speed of the drive motor in a slippage mode of at least one of the clutches (46, 47) of the planetary transmission (41) is synchronized with a connecting rotational speed of a target gear, and, when the connecting rotational speed is reached, a target gear is engaged, and the planetary transmission (41) is one again deactivated.

Dependencies are inferred from the claim text.