Zf Friedrichshafen Ag

Zf Batavia L.l.c.

Kupper-weisser Gmbh

Anton Welte

Ralf Vorndran

Wolfgang Runge

Patrick Speicher

Walter Frei

Richard-Peter Seidl

Reinhold Otto Dankwart

Karl-Rudolf Schmidt

The invention relates to a method for manually stipulating the transmission ratio of a continuously variable transmission (CVT) for a motor vehicle. The CVT comprises a control device, a shifting or selecting device, a starting element and a variator for adjusting the transmission ratio which is driven, in particular, by an internal combustion engine. The control device processes input signals derived from a driver-vehicle system within the framework of an operational strategy for stipulating the transmission ratio, the rotational speed of the drive motor or a variator input rotational speed. In a first automatic operation mode, the operational strategy automatically selects the transmission multiplication. In a second manual operational mode, the driver can directly intervene, via the shifting or selecting device, in the selection of the transmission multiplication. The invention provides, in the second mode of operation, that preset, continuous and vehicle speed-dependent engine rotational speed progressions or variator input rotational speed progressions or transmission ratio progressions can be manually selected. The progressions are displayed as curve traces within upper and lower limits of the adjustment range such that vehicle stand still and a highest possible speed of the vehicle can be attained in each progression.

Method for manually stipulating the transmission ratio of a continuously variable transmission (CVT)

Shifting device for a motor vehicle continuously variable transmission

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Friedrichshafen, Germany

Anton Welte