Renault S.a.s.

Getrag Ford Transmissions Gmbh

Bertrand Nodin

Harald Schmitz

Yohann Petillon

Axel Prenger-Berninghoff

Grégory Planche

Christophe Piard

Pedro Moreno Lahore

Johan Lefebvre

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 controlling a vehicle power train that includes a heat engine connected to the transmission of the vehicle by a clutch controlled between an open position and a closed position of the transmission by a computer of the transmission exchanging information with a computer of the heat engine. The method includes sending, in order to shut down the engine before the clutch is opened when the vehicle is in motion, the kinematic chain being closed and the injection interrupted, a message from the computer of the transmission to the computer of the engine at a first moment in time so as to synchronize an opening of the clutch and the closure of an air flap of the engine at a second moment in time subsequent to the first moment.

Method for controlling the shutdown of a heat engine

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Igny, France

Bertrand Nodin