Renault S.a.s.

Nissan Motor Company Limited

Frederic Roudeau

Aurelien Lefevre

Jean Bretheau

Gregory Planche

Vincent Vermuse

Amine Gourara

Florent Le-Cam

Thomas Turpin

Francois Fauvel

Vincent Duvivier

Tariq Ouaguenouni

A method controlling a state of a drivetrain including a set of couplers and reducers between a powertrain of a motor vehicle and one or a plurality of drive wheels of the vehicle, the drivetrain configured to take up a plurality of kinematic states each defined by a diagram of engagements of the couplers and reducers making it possible to link an engine of the powertrain to at least one drive wheel, the method including: calculating, before changing the kinematic state, depending on a current speed of the vehicle, a current kinematic state of the vehicle, and an intended kinematic state that is different from the current state, a change-of-state end speed; and comparing the change-of-state end speed with a threshold.

Method of selecting a drivetrain and associated device

A method for controlling an automatic gearbox for a motor vehicle having at least two different drive train states. The method includes: determining minimum deceleration force requirement that needs to be achieved by the drive train state depending on speed of the vehicle, longitudinal acceleration, and resistive forces experienced by the vehicle, then taking a decision to authorize or prohibit the drive train state for which the minimum deceleration force requirement has been calculated depending on the deceleration force setpoint, the current drive chain state, and the minimum force achievable by the drive train state in question.

Method for controlling an automatic gearbox for a motor vehicle

A method controls state changes of a drivetrain of a vehicle connecting at least one heat engine and/or one electric motor to the wheels of the vehicle via a transmission, providing the transfer of torque from the heat engine and/or from the electric motor to the wheels in one or more gear ratios. The authorization to switch from a current state to a target state depends on reducing an acceleration of the vehicle in an intermediate state causing a lower acceleration of the vehicle during the transition between the current state and the target state.

Method for controlling state changes of a drivetrain

A method selects a target state of a vehicle driveline connecting at least a combustion engine and/or an electric machine to the wheels of the vehicle by a transmission, from a set of states present on the transmission, which are defined by various combinations of couplers and reduction gears thereof in order to transfer torque from the combustion engine and/or from the electric machine to the wheels over one or more gear ratios. The method includes filtering to determine, from a list of available states, state consecutive eligible sets as a function of combined driveability constraints.

Method for selecting the target state of a drive train

A method for controlling a state of a drive train of a power train including at least one motive power source and a set of couplers and reducers of which respective engagements define a plurality of states of the drive train, by engagement of one or a plurality of energy sources in provision of torque and by the ratio of transmission of same to wheels. States targeted from a current state are ranked in real time on the basis of the difference between the motive force available in a current state and in each target state.

Method for controlling the state of a drive train of a power train of an electric, hybrid or combustion engine vehicle

A method for controlling automatic restarting of a vehicle including an automatic transmission, when the driver releases a brake pedal or pushes an accelerator pedal, the method including: a first phase of cranking an engine during which engine torque starts to increase without being transmitted to wheels of the vehicle, followed by a second launching phase during which the engine torque is gradually transmitted to the wheels, wherein the engine torque is controlled at a torque set value to be transmitted to the wheels, satisfying a launching time objective.

Method and device for controlling the restarting of a vehicle provided with an automatic transmission

A system and method for controlling a free-wheeling motor vehicle including at least one internal combustion engine connected to drive wheels by a transmission. The method includes: determining engine torque at wheels; determining longitudinal acceleration of the vehicle when a free-wheeling driving mode is activated, on the basis of resisting torques on the wheels; determining longitudinal acceleration of the vehicle when the free-wheeling driving mode is deactivated on the basis of the engine torque and the resisting torques on the wheels; determining the difference in longitudinal acceleration between when the free-wheeling driving mode is activated and the free-wheeling driving mode is deactivated; and opening the transmission chain when the longitudinal acceleration difference leans substantially toward a value of zero.

System and method for controlling a free-wheeling motor vehicle

A system for controlling a power propulsion unit of a hybrid type for a four-wheel-drive automotive vehicle that includes at least one electric motor part and at least one thermal engine part capable of driving the independent front and rear driving axles of the vehicle. The system includes a mechanism determining total torque set point from a request of the driver, a mechanism distributing the total torque set point, and a system optimizing the duty point, to dynamically determine the torques to be applied to each of the two driving axles and to optimize fuel consumption of the power propulsion group according to the drivability requested by the driver and driving conditions.

System and method for controlling a hybrid power propulsion unit for a permanent four wheel drive mode operation

A motor vehicle power train control device capable of furnishing set signals of torque applied to wheels of the motor vehicle. The control device includes a mechanism to generate a signal representing a limitation of variation in speed of a heat engine integrated in a power train capable of reducing variations that are disturbing with regard to acoustics of the power train, and includes a mechanism to determine an operating point of the power train in an optimal operating range according to the signal that represents limitation of speed. The mechanism for generating the signal that represents a limitation of variation in the speed of the heat engine integrated in the power train is furnished, at an input, by parameters that represent characteristics of the motor vehicle and by parameters that represent the driver's wishes.

Device and method for controlling torque applied to wheels of a vehicle

A device for controlling an automated transmission of a motor vehicle engine-transmission unit adapted to deliver a torque setpoint signal to be applied to wheels of the motor vehicle including two static and dynamic components produced based on input data delivered by an input unit. The input data includes a recorded list of parameters representing the driver's wishes, the motor vehicle state, and the motor vehicle surroundings. The device includes a first unit capable of calculating a dynamic torque component not adapted to a slope and/or load situation; a second unit for adaptation to the slope and/or load situation delivering a dynamic torque component adapted to the slope and/or load situation; a third unit capable of calculating a static torque component not adapted to the slope and/or load situation; and a fourth unit for adaptation to the slope and/or load situation delivering a static torque component adapted to the slope and/or load situation.

Method for producing a control setpoint adapted to a slope and/or load situation for a motor vehicle engine-transmission unit transmission device and corresponding device

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.

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Vitry sur Seine, France

Frederic Roudeau