| 摘要 |
The instant invention relates to a method for determining an application point of an automatically actuated friction clutch of an automatic mechanical transmission for a motor vehicle. According to it, after the pre-selection of a new gear, the clutch automatically separates, the activated gear is disengaged, the engine rotational speed is brought to a target value for the new gear and the clutch with higher advancing speed is advanced to an application point at which the transmission input shaft is precisely entrained. To determine the application point, the gradient of the time curve of the rotational speed of the transmission input shaft is monitored, an important change of the gradient that adjusts itself when reaching the application point is determined and the position of the clutch existing at this moment is defined as application point. The application point is preferably determined during downshifts, the time rotational speed curve of the transmission input shaft has between the slowdown and the re-acceleration a distinct minimum easily and accurately to be determined.
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