Renault S.a.s.

Guegan, Stéphane

Alessandro Monti

Richard Pothin

Guillermo Pita-Gil

Christophe Desfriches

Pascal Febrer

Francois Foussard

Stephane Guegan

Nicolas Romani

Arnaud Losq

Philippe Saint Loup

Philippe Saint-Loup

Eric Mounier

Alessandro De-Rinaldis

Bernard Guillerey

Philippe Saint-loup

Jean-Marie Foret

François Foussard

Stéphane Guegan

Roger Plichet

Philippe Leroy

Marius Piciu

A system for limiting engine torque of a four-wheel-drive motor vehicle, including an actuator that is controlled and configured to distribute the engine torque to the drive wheels, a computer calculating at least one variable characteristic of an operation of the vehicle, and a module for limiting the engine torque. In addition, the limitation system includes a mechanism for deactivating the module for limiting the engine torque according to the variable characteristic of the operation of the engine.

System and method for limiting the engine torque of a four-wheel-drive vehicle

A method for processing data recorded during a data acquisition, the data defining a correspondence between values representing torque transmitted by a clutch and values representing a position of a clutch control member. The processing method includes modifying the recorded data to define a modified correspondence between the values representing the torque transmitted by the clutch and the values representing the position of the clutch control member, the modified correspondence to be used in a hill start assist device of a motor vehicle including a power train connected to drive wheels by a transmission system including the clutch and a braking system, whereby the release of the braking system is automatically controlled by the assist device.

Method for processing data in a device for power assistance of uphill maneuvers of a motor vehicle

A system for controlling release of an automatic parking brake device onboard an automobile, that includes a transmission mechanism transmitting an instruction several times for releasing the parking brake device, and an interface provided between the transmissions of the release instruction and for transmitting a release instruction of the parking brake device.

System for controlling the release of an automatic parking brake device onboard an automobile

A system for managing braking of an automotive vehicle including an assisted parking brake with at least one brake actuator capable of acting on at least one wheel of the vehicle and a mechanism applying the parking brake. The system includes a mechanism automatically increasing firmness with which the parking brake is applied after the vehicle engine stops, which includes a module that detects stopping of the engine and a module that commands an increase in the firmness of application. The module is configured to emit a signal characteristic of the stopping of the engine as a function of a status of the engine and of a status of an electrical supply. The module is configured to emit a signal demanding an increase in the firmness of application as a function of a status of the brake actuators and of signal characteristic of the stopping of the engine that comes from the module.

Automotive vehicle braking management system and method

A method and system for diagnosing an operating status of an assisted start-up mode for a motor vehicle. The system includes a driving engine, a transmission including a mechanism determining a piece of engine rotation speed information, a piece of information on a position of an accelerator pedal of the vehicle, a piece of information on a position of a transmission, and a piece of information on torque transmitted to wheels, a detection mechanism producing a malfunction signal for the assisted start-up using the information received, a plurality of encoding mechanisms to produce a follow-up signal for each piece of calculated information received, and a memory saving the follow-up signals.

Method and system for diagnosing the operating status of an assisted start-up mode for a motor vehicle

A method managing a device distributing engine torque between main and secondary wheel sets of a motor vehicle, the distributing device including an actuator distributing engine torque, a control unit exhibiting plural distribution modes of the engine torque and adopting one distribution mode as a function of a variable and a button selecting a distribution mode delivering an information item representative of the button position, the control unit determining, in regular operation, the variable, as a function of the information item; the method includes: detecting potential failure of the selection button, including verifying consistency of the information item; activation of degraded mode of operation, when a failure of the button is detected, in which a constant value is allocated to the variable; during degraded operation, monitoring end of failure, including verifying consistency of the information item; activation of regular mode of operation, when end of failure is detected.

Method of managing a device for distributing engine torque upon a failure of its selection button

A splitting of drive torque between front and rear wheelsets includes an actuator to split the torque between the wheelsets, an electronic unit controlling switching of the actuator into a coupled or uncoupled mode, a mechanism electrically powering the electronic unit, and sensors. The electronic unit can make the system adopt: an active operation in which a control signal is generated and the temperature of the actuator is estimated; and a sleep mode in which the temperature of the actuator is not estimated; the switch to sleep mode being authorized: only when the engine is stopped, and if the actuator temperature is below or equal to a threshold or a maximum time period has elapsed.

Method of managing a device that splits drive torque between the front and rear wheelset of a vehicle

A method controlling operation of a mechanism mechanically coupling first and second axles of a transmission system of a motor vehicle, the first axle being driven as standard and the second axle being driven as an option depending on a status of the coupling mechanism, the transmission system being capable of operating in a first mode in which a value of transmittable torque that can be transmitted by the mechanical coupling mechanism is fixed, or in a second mode in which the value of the transmittable torque that can be transmitted by the mechanical coupling mechanism is higher than the value of the transmittable torque for the first mode.

Method for controlling the operation of a means of mechanically coupling the first and second axles of a motor vehicle

A device for recording data emitted from a motor vehicle management system, including a volatile memory, a non-volatile memory, and a data recording module configured to receive a signal concerning activation status emitted by the management system and to record the data in a first zone of the volatile memory on a rising edge of the activation status signal and in a second zone of the volatile memory on a falling edge of the activation status signal, and including a record management module configured to receive the activation status signal and to activate a command to record on a falling edge with the activation status signal, the recording module being further configured to receive the record command and to record the content of the two zones of the volatile memory into a zone of the non-volatile memory when the record command is activated.

Method and device for performing diagnostics on a motor vehicle management system

A method of diagnosing an operating state of an assisted starting system of a motor vehicle equipped with a controlled parking brake, the method including calculating at least one item of vehicle information, generating at least one item of validity information associated with the vehicle information, recording in a non-volatile memory vehicle information and associated validity information during a command to disengage the parking brake, and providing at least one item of diagnostic information from a verification of the validity of the recorded information.

Method and system for diagnosing the operating state of an assisted starting system of a motor vehicle

A method for controlling a speed difference between speed of wheels of a front axle and speed of wheels of a rear axle of a four-wheel drive vehicle. The method: determines an initial speed difference set point based on the speed of the vehicle; determines one or more intermediate speed difference set points based on one or more operational parameters of the vehicle; modulates the initial speed difference set point based on the intermediate speed difference set points to obtain a final speed difference set point; measures the speed difference and compares the measured speed difference with the final speed difference set point; and controls the measured speed difference, so that the measured speed difference reaches the final speed difference set point.

Method for controlling a speed difference between the front wheels and rear wheels of a four-wheel drive vehicle

A method for processing a signal originating from a position sensor of a motor vehicle control member, to produce a processed signal relating to the position of the control member. The method includes: a filtering phase in which the signal originating from the sensor is filtered using a first filter to obtain a first filtered signal, and a substitution phase in which the first filtered signal is supplied as the processed signal, a second signal being added to the first filtered signal if the instantaneous value thereof is greater than the value of a first threshold parameter, and, in the opposite case, the signal originating from the sensor is provided as the processed signal.

Method for processing a signal originating from a position sensor of a motor vehicle control member

An assist device for a vehicle including a power train connected to drive wheels by a clutch, a bus, and a power-assist parking brake. The device includes sensors that transmit signals to the bus and a mechanism for learning-based estimation of a clutch curve on the basis of the signals, the curve connecting the position of the clutch pedal and a maximum torque range that can be transmitted by the corresponding clutch and a mechanism phasing the delivered signals to reduce an influence of noise on the sensors associated with the signals.

Power-assistance device for a vehicle

A device for determining, when driving a vehicle, a mapping of torque transmitted by a clutch of the automobile based on a position of a clutch control member. The device includes a mechanism updating the mapping based on position thresholds of the clutch control member. The updating modifies values of the thresholds based on minimum and maximum values of the positions of the control member stored in the mapping and on current values of the thresholds.

Device and method for determining a mapping of the torque transmitted by a clutch in an automobile and hill-start assistance system for an automobile equipped with such device

Following an automobile start command, at least one condition is examined before a hill start assist is executed and if the condition is fulfilled, the execution of the hill start assist is prevented.

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La Garenne Colombes, France

Alessandro Monti