Renault S.a.s.

Pascal Febrer

Alessandro Monti

Nicolas Romani

Francois Foussard

Stephane Guegan

Philippe Saint Loup

Christophe Desfriches

Arnaud Losq

Olivier Boutron

Gael Hedouin

Ramiro Rodriguez

François Foussard

Stéphane Guegan

Gaël Hedouin

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 device distributing engine torque between first and second wheel sets of a vehicle, including a mode switch movable between a first stable position and a second unstable position, activating first and second engine torque distribution modes. When the vehicle stops while the second distribution mode is activated and then restarts after a stop duration, the second distribution mode is activated if the stop duration is less than a time delay, otherwise the first distribution mode is activated. It is determined, in the second distribution mode, whether the vehicle exceeds a predetermined maximum speed threshold. If so, a transition is made to an on-road mode. In the off-road mode, it is determined whether the vehicle exceeds a predetermined intermediate speed threshold, strictly less than maximum speed threshold in an off-road mode, during a time greater than a predetermined duration, to transition back to the on-road mode.

Method and device for distributing an engine torque between two wheel sets of a motor vehicle

A method of operating a transmission system of an automotive vehicle, the transmission system including a mechanism of mechanically coupling first and second axles of the transmission system, a status of the coupling mechanism defining a number of transmission modes. In the method, if the automotive vehicle crosses a speed threshold for a determined length of time, for example between 30 seconds and two minutes, the transmission system switches from a first mode in which the torque that can be transmitted by the mechanical coupling mechanism is fixed, into a different transmission mode.

Method of operating a transmission system of an automotive vehicle of the four-wheel drive type comprising a means of mechanically coupling the first and second axles

A method of operating a transmission system of an automotive vehicle, the transmission system including a mechanism of mechanically coupling first and second axles of the transmission system, a status of the coupling mechanism defining a number of transmission modes. The transmission system includes a button of pulse type controlling selection of a transmission mode and, after the vehicle has stalled, the transmission mode that is active following restarting of the vehicle is the mode that was active before the vehicle stalled.

Method of operating a motor vehicle transmission system

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

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.

Method for securing the operation of an automobile provided with hill start assist, and such an automobile

A system including a calculator and a control housing including switches having a single stable position in an opened position and with a manual control member for the switches. The control member is of monostable type with automatic return into a rest position in which all switches are open. The housing includes: a single first switch controlling actuation of brakes and adapted to be closed upon an action on the control member in a first direction; a single second switch controlling release of the brakes and adapted to be closed upon an action on the control member in a second direction opposite the first direction; and a diagnosis circuit providing, according to the position of the control member, an analog information distinguishing between a system activated state in which one of the first and second switches is closed, a system deactivated state in which the first and second switches are open, and malfunction states.

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Paris, France

Pascal Febrer