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AssigneeZF Friedrichshafen AG
InventorsThomas Jäger, Roland Mair
Estimating the term…
A method of determining an application point of an automatically actuated clutch of an automatic mechanical transmission. After pre-selecting a new gear, the clutch automatically separates, the activated gear disengages, 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 current position of the clutch is defined as the application point. The application point is determined during downshifts, the time rotational speed curve of the transmission input shaft is between slowdown and re-acceleration, which is easily and accurately determined.
A method for determining an application point of an automatically actuated friction clutch of an automated mechanical transmission of a motor vehicle, which, when shifting gear ratios, a new gear is pre-selected, the friction clutch automatically disengages, an activated gear disengages, a rotational speed of an engine is adjusted to a target value for the new gear and the friction clutch is advanced, prior to and continuously after the application point, such that a transmission input shaft is precisely entrained to bring a rotational speed of the transmission input shaft to a shifting rotational speed required for engaging the new gear, the method comprising the steps of:
Dependencies are inferred from the claim text.