Shift control method for an automated range-change transmission

A computer program product, stored on a computer-readable data medium, for performing a method of shift control of an automated auxiliary transmission, which is mounted in a drive train of a motor vehicle between a drive motor (AM) and a final drive and comprises at least one multi-step main gearing (HG) and one two-step front-mounted group (VG) upstream of the main gearing (HG), and in which the main gearing (HG) is shiftable, via unsynchronized clutches, and the front-mounted group (VG) is shiftable, via synchronized clutches, the method including, depending on a currently existing driving or operating situation, changing a gear in the auxiliary transmission by changing a transmission ratio step (G1, G2, G3) of the main gearing (HG) while maintaining a currently engaged transmission ratio step (K1, K2) in the front-mounted group (VG),

• the computer program product being executed on a control device (1) for the shift control of the auxiliary transmission of the motor vehicle, comprising at least one receiving interface (2), which is configured to receive signals from drive train components, an evaluation unit (3), which is configured for evaluating the received input signals, or information of the received input signals, and a transmitter interface (4), for transmitting control signals to the drive train components (5), the control device (1) being configured to activate shifting elements of individual groups of the auxiliary transmission, and depending on either currently existing driving or operating situation, a gear change is performed in the auxiliary transmission, while maintaining the currently engaged transmission ratio step (K1, K2) in the front-mounted group (VG).