Method for improving shift quality during gear shifting and gear shifting control

摘要

The present invention relates to a method for improving the shift quality during gear shifting in a gearbox unit containing at least one gear branch for power transfer via a hydrodynamic clutch (2), which can be coupled in series with a mechanical gearing part (3) containing means for realizing at least two speeds. The invention is characterized in that: during power transfer via the hydrodynamic clutch (2) during a gear-shift operation between two mechanical speeds, the fill factor of the hydrodynamic clutch (2) is so altered that a variable which at least indirectly characterizes the rotational speed of the primary blade wheel (4) of the hydrodynamic clutch (2) is held substantially constant over a certain range of the gear-shift operation. There is further described a control for improving the shift quality during gear shifting in a hydrodynamic-mechanical compound gearbox (1), which control includes means for controlling number of revolutions of a primary blade wheel (4) of the hydrodynamic clutch (2) when shifting the gears.