Renault S.a.s.

Thomas Turpin

Yves Pichon

Frederic Roudeau

Jean Bretheau

Philippe Pognant-Gros

Frédéric Roudeau

Laurent Royer

Fehd Ben-Aicha

Damiano Di-Penta

Laurent Caniez

Karim Ben-Cherif

Stéphane Sadai

Catherine Vauthier

Béatrice Gesnot

An automatic transmission of a power train for a motor vehicle capable of producing a set operating speed and a set power train control to attain an engine speed, according to a torque applied to wheels that is adapted to wishes of the driver. The device includes: an input unit that furnishes input data; a control unit having at least two modules according to two distinct driving modes, an automatic mode and a manual mode with pulse control; a processing module for processing signals furnished by a motor vehicle speed control; a selection module that receives signals from the processing module and from the motor vehicle speed control and capable of furnishing a selection signal (mode).

Method and device for controlling an automatic transmission for a motor vehicle

A method for controlling an infinitely variable transmission with an electric speed selector, including a heat engine and at least two electric machines based on calculating an instantaneous operating point of the transmission defined by a speed reference of the heat engine and a wheel torque reference. The wheel torque reference is corrected in case of saturation of the heat engine, so as to eliminate the saturation.

Method and device for controlling heat engine torque saturation in an infinitely variable transmission with electric speed selector

A method for controlling an automatic transmission of a power train for a motor vehicle, including producing a first set torque signal to be applied to the wheels, which represents wishes of the motor vehicle driver and that includes two components: a static component and a dynamic component. The dynamic component of the set signal is filtered according to at least two predetermined thresholds that define at least three distinct filtering zones. A filter of order n is used in the first and the third filtering zone and, in the second filtering zone, a maximum slope is imposed upon the dynamic component of the first set signal, the maximum slope being adjustable according to predetermined input data.

Method for controlling a set torque to be applied to wheels of an automatic transmission for a motor vehicle and corresponding device

A control process for mode change decisions for an infinitely variable transmission with several modes of operation including at least two parallel coupling paths, each containing a closed coupler for the first mode of operation and open for a second mode of operation, with the two couplers being closed simultaneously during a delay period during the mode changes, wherein the mode change decision is imposed onto the transmission if the speed differential at the terminals of the coupler to be closed to change the mode, exceeds a first pre-established threshold.

Control process for mode change decisions for an infinitely variable transmission

A control device for an automatic gearbox, coupled to the engine or a motor vehicle, by a torque converter, including a locking device for a fixed connection of the output shaft of the engine to the input shaft of the automatic gearbox, to produce a lock-up and conversely to release the lock-up. The device further includes an engine control unit, for providing an order for the engine, such as a demand for torque, and a control unit for the gearbox for transmitting to the engine control unit an order such as a torque request. The gearbox control unit may transmit to the engine control unit a torque request as a function of slip and the torque value as demanded by the driver of the vehicle such that the speed of the engine may approach the speed of a turbine of the torque converter so that a lock-up or lock-up release can be carried out.

Device and method for control of an automatic gearbox for control of lock-up and lock-up release

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Orsay, France

Thomas Turpin