Getrag Ford Transmissions Gmbh

Renault S.a.s.

Axel Prenger-Berninghoff

Harald Schmitz

Marco Siebigteroth

Bertrand Nodin

Grégory Planche

Pedro Moreno Lahore

Klaus Luig

The invention concerns a method for automatically controlling a motor vehicle () for switching from a 'normal' mode to a 'freewheel' mode, the vehicle () comprising an engine () capable of providing engine torque to drive wheels () via an automatically controlled clutch device () that comprises a drive shaft () and a driven shaft (). A transition step (E) is interposed chronologically between the &#x201c;normal&#x201d; mode and the &#x201c;freewheel mode&#x201d; during which the engine () is automatically controlled in such a way that the driven shaft () and the drive shaft () turn at the same speed without transmitting torque to the drive wheels ().

Method for automatically switching a motor vehicle to freewheel mode

A method for gear shifting a dual clutch transmission from an initial gear into a target gear and a respective dual clutch transmission are described. The dual clutch transmission comprises a first partial transmission and a second partial transmission. When shifting from an initial gear into a target gear which are both allocated to the first partial transmission, gears are shifted at least for a short time period into the support gear prior to gear shifting from the support gear into the target gear. A process of an uninterrupted reduction of the transmitted clutch torque down to zero at a first clutch allocated to the initial gear is started prior to starting a process of closing the second clutch allocated to the support gear.

Method of gear shifting a dual clutch transmission

Growing community of inventors

Erkelenz, Germany

Axel Prenger-Berninghoff