Method for determining the application point of an...

Details Method for determining the application point of an... Method for determining the application point of an...

2006-05-05

2010-12-14

Ho, Ha D. (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

With clutch control

C477S080000, C477S175000

Reexamination Certificate

active

07850570

ABSTRACT:
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.

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