Method for operating an automatic gearbox on a motor vehicle
AssigneeZF Friedrichshafen AG
InventorsMatthias Winkel, Bertram Wengert
Life of this patent
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Abstract
A method for the operation of an automatic transmission in a motor vehicle. The downshifting of the transmission takes advantage of a braking action of a driving motor connected to the automatic transmission through a clutch, are terminated by the closing of a clutch during a compression phase lasting until the achievement of a predetermined threshold speed. For the improvement of the immediacy of the vehicle drive after the termination of the compression phase, the invention provides that at speeds less than the threshold speed, downshifting is carried out and is terminated with an open clutch.
Claims12
1-11. (canceled)
A method of operating an automatic transmission of a motor vehicle, the method comprising the steps of:
- carrying out a downshifting during a compression braking operation which continues up to attainment of a predetermined threshold speed and terminated by engagement of a clutch located between a vehicle drive motor and the transmission, and
- when the downshifting is at a speed less than the predetermined threshold speed, terminating the downshifting by disengagement of the clutch.
Dependencies are inferred from the claim text.