Execution of different shift maps. When, during acceleration of the vehicle, the accelerator pedal has already been held at a constant position for a predetermined time period, execution of a second shift map/mode starts and is maintained as long as the accelerator pedal is held at said constant position (see flow chart in Fig.5). With the second shift map, upshift is repeatedly executed at a predetermined shift interval. Thereby an acceleration feeling corresponding to the second shift map is achieved. In other words: An acceleration feeling can be improved (see par. [0017]). Dependent claims 2-4 define embodiments of the shift interval, i.e. embodiments of the second shift map: Claim 2 : shift interval = constant time. Thereby an acceleration feeling having a constant rhythm can be enacted on the driver (see par. [0018]); Claim 3 : shift interval = constant engine speed. Thereby the tone of the engine speed becomes constant for every shift, hence a comfortable sensation of acceleration can be enacted on the drive (see par. [0019], [0086] and Fig.7); Claim 4 : shift interval = a plurality of engine speeds. Thereby sound volume of the engine speed gets gradually smaller every shift, hence hence a comfortable sensation of acceleration can be enacted on the drive (see par. [0020], [0094] and Fig.8).