EP3049282A2 - Driving assistance method and device - Google Patents

Driving assistance method and device

Info

Publication number
EP3049282A2
EP3049282A2 EP14777070.5A EP14777070A EP3049282A2 EP 3049282 A2 EP3049282 A2 EP 3049282A2 EP 14777070 A EP14777070 A EP 14777070A EP 3049282 A2 EP3049282 A2 EP 3049282A2
Authority
EP
European Patent Office
Prior art keywords
vehicle
pulsed signal
same type
variable transmission
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14777070.5A
Other languages
German (de)
French (fr)
Inventor
David Hue
Hafid EL IDRISSI
Etienne Monchy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP3049282A2 publication Critical patent/EP3049282A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B60Q1/1415—Dimming circuits
    • B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
    • B60Q1/143—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic combined with another condition, e.g. using vehicle recognition from camera images or activation of wipers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J3/00—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles
    • B60J3/02—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles adjustable in position
    • B60J3/0291—Preventing dazzlement during driving in the dark
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/115—Controlling the light source in response to determined parameters by determining the presence or movement of objects or living beings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/19—Controlling the light source by remote control via wireless transmission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/20—Indexing codes relating to the driver or the passengers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/40—Indexing codes relating to other road users or special conditions
    • B60Q2300/42—Indexing codes relating to other road users or special conditions oncoming vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/40—Indexing codes relating to other road users or special conditions
    • B60Q2300/43—Indexing codes relating to other road users or special conditions following vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/40—Indexing codes relating to other road users or special conditions
    • B60Q2300/47—Direct command from other road users, i.e. the command for switching or changing the beam is sent by other vehicles or road devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the invention relates to a device for assisting the driving of a motor vehicle.
  • the invention also relates to a method of assisting the driving of a motor vehicle.
  • the present invention relates to methods and devices for providing assistance to the driving of motor vehicles, particularly when the external brightness is low, and requires lighting fires.
  • the light beams emitted by the lighting devices fitted to the vehicles are governed by international regulations, which fix maximum and minimum intensities to be respected, for example on a screen placed at a distance and in the axis of the lighting device. These regulations are intended to simultaneously:
  • One of these is to use a driver assistance device consisting of a pulsed lighting synchronized with a variable transmission screen, so that the lighting reaches its maximum value when the transmission coefficient of the screen reaches its maximum value, that is to say a maximum transparency, and so that the illumination reaches its minimum value when the transmission coefficient of the variable transmission screen reaches its minimum value, c that is, minimal transparency.
  • the driver takes full advantage of its lighting, while reducing the risk of glare from sources of external lights, because the driver's vision is greatly diminished when the screen to variable transmission has its transparency to a minimum.
  • pulsed lighting does not dazzle other vehicles since they perceive only average illumination that is expected to comply with the above regulations.
  • both vehicles are antiphase, that is to say that when the vehicle has its variable transmission screen which has its transmission coefficient at a minimum while the other vehicle has its lighting on, the driver does not see ( or see much less) the lighting of the other vehicle.
  • both vehicles are in phase, ie their lights are on at the same time and their variable transmission screens have their maximum transmission coefficient at the same time, the driver may be disturbed by the lighting. from the other vehicle.
  • the invention aims to overcome at least some of the disadvantages of known driving assistance devices.
  • the invention relates to a device for assisting the driving of a motor vehicle, the vehicle being equipped with at least one lighting device adapted to emit a lighting beam of a road scene in front of the vehicle, said aid device comprising a variable transmission screen, intended to be arranged between the road scene and a driver of the vehicle, said assistance device being configured for, in the active phase, driving an ignition from less a light source of the lighting device and a transmission coefficient of the variable transmission screen, in relation to each other, by a pulsed signal.
  • said assistance device is configured to detect a vehicle equipped with a device of the same type by inter-vehicle communication and to modify said pulsed signal so as to avoid antiphasing and / or phasing phenomena, when said device detects such a vehicle "Device of the same type" is understood to mean a device for assisting the driving of a motor vehicle, the vehicle being equipped with at least one lighting device able to emit a lighting beam of a road scene.
  • said assistance device comprising a variable transmission screen, intended to be arranged between the road scene and a driver of the vehicle, said assistance device being configured for, in the active phase, driving an ignition of at least one light source of the lighting device and a transmission coefficient of the transmission screen synchronously variable by a pulsed signal which may be the same as that of the first vehicle.
  • a device thus makes it possible to prevent antiphasing and phasing phenomena by modifying the pulsed signal as soon as a vehicle equipped with a device of the same type is in the vicinity.
  • crossed vehicle will sometimes be used to designate the vehicle equipped with a device of the same type located nearby. Nevertheless, this designation can not be restrictive to a vehicle arriving in front of the vehicle equipped with the device according to the invention, but it also applies to any vehicle equipped with a device of the same type because of which the appearance of phenomena of antiphasage and / or phasage can disrupt the driving of the vehicle equipped with the device according to the invention, for example a vehicle arriving laterally on an intersection, a following vehicle behind or a vehicle that overtakes, the device according to the invention being adapted to detect the presence of vehicle in one or more of the directions where these vehicles may be.
  • said aid device comprises means for exchanging wireless data between vehicles, for the detection of vehicles equipped with a device of the same type.
  • a solution provides the device according to the invention a good anticipation. Indeed, an inter-vehicle communication makes it possible to detect the crossed vehicles at a great distance, at least equal to or even greater than the range of the high beams of the crossed vehicles, and thus to make the modification according to the invention of the pulsed signal before the problems mentioned above do not appear.
  • this solution has the advantage of using fully embedded means in the vehicle.
  • the device detects the frequency and / or the phasing of the illumination beam coming from the crossed vehicle equipped with a device of the same type.
  • the assistance device retrieves information on the frequency and / or the phasing of the light beam coming from the crossed vehicle in order to adapt the modification of the pulsed signal as a function of the frequency and / or phasing detected.
  • the help device is configured to modify the pulsed signal by applying a phase shift.
  • the modification consists only in a phase change and allows to work at a fixed frequency.
  • phase shift value (Phi) is chosen in a pseudo-random manner, for example using any pseudo-random value generator known to those skilled in the art.
  • said device is configured for:
  • only one of the vehicles modifies its pulsed signal and this avoids the same modification being made to the vehicles being crossed.
  • the device is configured to control the transmission coefficient of the variable transmission screen so that the transparency of the variable transmission screen is maximum, when the device detects a light beam coming from a crossover vehicle equipped with a device of the same type.
  • the screen is made transparent while preserving pulsed lighting, which allows the driver to see all light sources without or with very little attenuation, and in particular to see the lighting of the light. crossed vehicle and thus avoid a phenomenon of antiphasage between the two vehicles.
  • the transmission coefficient may however take into account a brightness level.
  • the synchronism between the transmission coefficient and the ignition of the light source (s) is advantageously active, except in cases such as the one given above, which is only 'an example.
  • the pulsed signal is periodic of period T.
  • the average of the signal pulsed during the period T after modification of said signal is the same as the average of the signal pulsed during this same period T before modification of said signal. We then remain advantageously in synchronism.
  • any modification made to the signal will have no effect on the average value of the quantities involved.
  • the average power of the ignition will be constant whatever the modification, which allows to benefit from the same brightness for the driver and to remain compliant with the regulations in terms of lighting.
  • said assistance device is configured to simultaneously detect several vehicles equipped with said device of the same type and to operate in network with said vehicles. In this way, it is possible to obtain a modification of the pulsed signals of all the vehicles that is consistent with the objective to be achieved.
  • the device comprises a control unit adapted to transmit the pulsed signal to the lighting device and / or the variable transmission screen.
  • Said control unit may also be adapted to support and operate inter-vehicle communication.
  • control unit comprises a remote control wave transmitter capable of transmitting the pulsed signal to a receiver of said variable transmission screen, said receiver being able to control the transmission coefficient of the variable transmission screen.
  • the remote control wave transmitter is configured to transmit the pulsed signal according to a wireless communication protocol.
  • the pulsed signal is variable according to a Pulse Width Modulation (PWM) mode.
  • PWM Pulse Width Modulation
  • variable transmission screen consists of:
  • the invention also relates to a method of assisting the driving of a motor vehicle, the vehicle being equipped with at least one lighting device adapted to emit a lighting beam of a road scene in front of the vehicle , and a screen with variable transmission, intended to be arranged between the road scene and a driver of the vehicle, said method comprising a driving step in relation to each other of an ignition of at least one light source of the lighting device and a transmission coefficient of the screen with variable transmission, by a pulsed signal.
  • the method contains a step of detecting a vehicle implementing a method of the same type, by inter-vehicle communication, in particular by wireless data exchange, and a step of modifying said pulsed signal so as to avoid phasing and / or phasing phenomena when such a vehicle is detected.
  • a method according to the invention thus makes it possible to prevent antiphasing and phasing phenomena by modifying the pulsed signal if there is presence in the vicinity of a vehicle implementing a method of the same type.
  • said step of detecting the intersection of a vehicle comprises a step of detecting the frequency and the phasing of the illumination beam of said crossed vehicle.
  • said modification step comprises a phase shift step of said pulsed signal.
  • phase shift value (Phi) is chosen pseudo-randomly.
  • the step of controlling the transmission coefficient maximizes said transmission coefficient so that the screen is transparent, when crossing a vehicle implementing a method of the same type.
  • the pulsed signal is periodic of period T when operating in synchronized control.
  • the average of the pulsed signal during the period T after said modifying step is the same as the average of the signal pulsed during this same period T before said modifying step.
  • the aid method comprises a step of transmitting the pulsed signal to the lighting device and to the variable transmission screen.
  • the step of transmitting the pulsed signal is done according to a wireless communication protocol.
  • the pulsed signal is variable according to a pulse width modulation mode.
  • said method comprises the steps:
  • said method comprises a step of simultaneous detection of several vehicles implementing said method and a step of network operation with said vehicles.
  • the invention also relates to an aid device and an aid method characterized in combination by all or some of the characteristics mentioned above. above or below.
  • FIG. 1 is a schematic partial sectional view of a vehicle comprising a driving assistance device according to one embodiment of the invention
  • FIG. 2 is a schematic view of the assistance device of FIG. an embodiment of the invention
  • FIG. 3 is a diagram of the temporal evolution of different signals emitted by a device according to the invention, in the case of crossing a vehicle equipped with a device of the same type.
  • FIG. 1 schematically shows in partial section a vehicle 20 comprising a driver assistance device according to one embodiment of the invention.
  • the vehicle 20 is conventionally equipped by a lighting device 22 able to emit a light beam of a road scene SR by means of a light source, and is piloted by a driver, symbolized by its eye 24.
  • the road scene corresponds to what the driver 24 of the vehicle 20 observes.
  • the driver 24 observes here the road scene in front of the vehicle 20 and through the windshield 26.
  • variable transmission screen is disposed in the field of view of the driver 24, between the latter and the road scene.
  • the variable transmission screen may consist of:
  • a screen F itself placed between the conductor 24 and the windshield 26, for example folding like a sun visor,
  • the aid device when it is in the active phase (that is to say in operation), controls the transmission coefficient of the variable transmission screen and the light source of the device. 22
  • Such a steering is synchronism, at least when no vehicle equipped with a device of the same type is present in the vicinity. This is to ensure that the variable transmission screen has its maximum transmission coefficient (i.e., the screen transparency is at a maximum) when the lighting device 22 is turned on, and therefore that the driver 24 sees the road scene illuminated by his lighting device 22.
  • the variable transmission screen it is also the purpose of the variable transmission screen to have its transmission coefficient at the minimum (that is to say, the transparency of the screen is at least) when the lighting device 22 is off, and therefore the external lights of the road scene is attenuated, especially those of crossed vehicles.
  • the device here comprises a control unit 30 which generates a pulsed signal for controlling the lighting device 22 and the variable transmission screen.
  • the control unit 30 may be connected to a management circuit 32 which controls the power supply of the ignition device so that said device emits a beam of variable intensity between a maximum value and a minimum value which is periodically variable according to the pulsed signal.
  • the control unit 30 may also be connected to a control circuit of the transmission coefficient 34 for the transmission of the pulsed signal. If the variable transmission screen is movable or remote from the control unit 30 (in the case of the use of the glasses 28 or the screen F for example), the transmission of the pulsed signal can be effected by a link wireless, using a determined wireless communication protocol, as for example according to IEEE 802.15.1 standards and all its extensions (commonly known by the trademark Bluetooth) or IEEE 802.11 (commonly known as Wi-Fi).
  • a determined wireless communication protocol as for example according to IEEE 802.15.1 standards and all its extensions (commonly known by the trademark Bluetooth) or IEEE 802.11 (commonly known as Wi-Fi).
  • the transmission coefficient control circuit 34 comprises, for example, a remote control wave transmitter 38, and The variable transmission screen is provided, for example, with a receiver 40 of these same remote control waves.
  • the receiver 40 then controls the variable transmission coefficient of the screen, in the sense that it applies to the variable transmission screen the determined orders corresponding to the pulsed signal.
  • Figure 2 is a schematic view of the aid device according to one embodiment of the invention using a wireless transmission.
  • the control unit 30 comprises a microcontroller which provides a pulsed signal of fixed frequency and zero phase shift. This unmodified pulsed signal is transmitted to the control circuit of the transmission coefficient 34 via the connection 42, and is transmitted to the management circuit 32.
  • the control unit 30 also receives data from means 44 for wireless data exchange between vehicles.
  • Said means are configured to transmit and receive data, in particular identification data, to or from vehicles having the same equipment. It may in particular be exchanges of data according to the standard known as "Bluetooth" already mentioned above.
  • Bluetooth the standard known as "Bluetooth” already mentioned above.
  • the data exchange means 44 receive data from another vehicle, the device then knows that a vehicle equipped with a device of the same type is nearby and that the pulsed signal from at least one of the two vehicles must be modified.
  • the data exchange means 44 may be configured to recover the frequency and / or the phase of the light beam of the crossed vehicle.
  • the microcontroller 30 continues to supply the unmodified pulsed signal to the control circuit of the transmission coefficient 34 and to the management circuit 32. If there is detection of the crossing of a vehicle equipped with a device of the same type, the microcontroller can use the frequency and phasing data of the light beam of the crossed vehicle to modify the pulsed signal so adapted.
  • the modification may consist of a change of frequency and / or phase, knowing the frequency and the phase of the crossed vehicle.
  • the modification may consist of a single phase shift, which makes it possible to work at a fixed frequency.
  • the phase shift can be chosen according to the phase of the crossed vehicle, or in a pseudo-random manner so that, if the crossed vehicle also makes a phase change following the detection of the crossing, the phase shifts used by the two vehicles are identical.
  • the microcontroller may decide to send a command to the control circuit of the transmission coefficient 34, for example via the connection 42, and at the reception from this command, the control circuit of the transmission coefficient 34 will transmit to the variable transmission screen a maximum transmission coefficient throughout the duration of the crossing.
  • the microcontroller may decide to suspend the sending of the pulsed signal to the control circuit of the transmission coefficient 34, and to send instead a continuous signal so that the transmission coefficient of the screen to variable transmission is at most, that is to say that the transparency of the variable transmission screen is at maximum.
  • the synchronism of the control of the light source of the lighting device and the transmission coefficient of the variable transmission screen is suspended during the crossing period.
  • the variable transmission screen remains at its maximum transparency while maintaining a pulsed lighting.
  • the driver 24 then enjoys a road scene without attenuation of brightness, regardless of the light source.
  • the brightness level may advantageously also be taken into account to adjust the transmission coefficient.
  • said device is configured to:
  • the device of the vehicle having issued the acknowledgment of receipt will abstain from modifying its pulsed signal.
  • Said help device may also be configured to take into account the presence of several vehicles operating in a network.
  • the aid device according to the invention uses means 44 for wireless data exchange between vehicles for the detection of vehicles equipped with a device of the same type ensures in particular the device a good anticipation: an inter-vehicle communication makes it possible to detect the crossed vehicles at a great distance, at least equal to or even greater than the range of the high beams of the crossed vehicles, and thus to make the modification according to the invention of the pulsed signal before the phasing phenomena and / or anti phasage do not appear, which would not allow optical sensors, for example.
  • FIG. 3 is a diagram of the time evolution of different signals in case of crossing a vehicle equipped with a device of the same type.
  • the beginning of the event "crossing of a vehicle equipped with a device of the same type” is represented by the dotted line referenced E.
  • the end of this event is represented by the dashed line referenced'.
  • Three signals are represented: A represents a pulsed signal which does not undergo modification, and which also serves as a control to represent the usual behavior of the signal when there is no crossing.
  • B represents a pulsed signal after the application of a type of modification following the detection of a crossed vehicle represented by the event E.
  • C represents a signal transmitted by the control circuit of the transmission coefficient 34 to the variable transmission screen, after the application of another type of modification following the detection of a crossed vehicle represented by the event E.
  • the signal A is a periodic pulsed signal of period T and duty cycle 0.5, that is to say that the signal is at its maximum level during half the period, ie T / 2. Since the signal A represents a pulsed signal which is not modified, it may also represent the pulsed signal of a crossover vehicle equipped with a device of the same type which does not detect the crossing of the vehicle 20 equipped with a device. aid according to the invention and therefore does not make any change to its pulsed signal.
  • Signal B represents a periodic pulsed signal of period T and a duty cycle 0.5, modified according to a first embodiment of the invention: this signal B is a pulsed signal which is modified by applying a phase shift Phi at the crossover of a vehicle equipped with a device of the same type, represented by the event E.
  • This phase shift makes it possible, between the event E and the event E ', to modify the phase of the signal so that it is no longer in antiphase or in phase with a crossover vehicle.
  • the signals are in phase before the event E and after the event E ', but this phasing is avoided between the event E and the event E', that is to say say during the period when the two vehicles cross each other. It remains here in synchronism and said pulsed signal B is used for both the transmission coefficient and the lighting.
  • the signal C represents the signal transmitted by the transmission coefficient control circuit 34 to the variable transmission screen, modified by a second embodiment of the invention: when there is no crossing of a vehicle equipped with a device of the same type, that is to say before the event E and after the event E ', the signal C is identical to the pulsed signal transmitted by the microcontroller.
  • the microcontroller will send a command to the control circuit of the transmission coefficient 34, for example through the connection 42 , and upon receipt of this command, the control circuit of the transmission coefficient 34 will transmit to the variable transmission screen a maximum transmission coefficient throughout the duration of the crossing.
  • the variable transmission screen then has its maximum transparency throughout the duration of the crossing.
  • This modification is particularly suitable when there is an antiphase phenomenon: the fact that the variable transmission screen has maximum transparency allows all external lighting, and thus the illumination of the crossed vehicle, to be perfectly visible.
  • the device according to the invention implements the method according to the invention.
  • the method according to the invention is implemented by the device according to the invention.
  • the pulsed signal transmission step is implemented by the remote control wave transmitter of the aid device according to the invention.
  • the remote control wave transmitter of the aid device according to the invention implements the step of transmitting the pulsed signal of the aid method according to the invention.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Traffic Control Systems (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The invention relates to a driving assistance device for a motor vehicle (20), said vehicle (20) being equipped with at least one lighting device (22) that can emit a beam to light a road scene (SR) in front of the vehicle (20). The assistance device comprises a variable transmission screen (26; 28; F) intended to be disposed between the road scene (SR) and the vehicle driver (24), said assistance device being configured, in the active phase, to control the switching on of at least one light source of the lighting device (22) and a transmission coefficient of the variable transmission screen (26; 28; F), in relation to one another, using a pulsed signal. The device is characterised in that the assistance device is configured to detect a vehicle equipped with a device of the same type by means of inter-vehicle communication and to alter the pulsed signal such as to prevent anti-phasing and/or phasing phenomena when the device detects such a vehicle.

Description

Dispositif et procédé d'aide à la conduite  Device and method for driving assistance
L'invention concerne un dispositif d'aide à la conduite d'un véhicule automobile. L'invention concerne également un procédé d'aide à la conduite d'un véhicule automobile. The invention relates to a device for assisting the driving of a motor vehicle. The invention also relates to a method of assisting the driving of a motor vehicle.
La présente invention concerne les procédés et les dispositifs destinés à apporter une aide à la conduite des véhicules automobiles, particulièrement lorsque la luminosité extérieure est faible, et impose l'allumage des feux. The present invention relates to methods and devices for providing assistance to the driving of motor vehicles, particularly when the external brightness is low, and requires lighting fires.
Les faisceaux lumineux émis par les dispositifs d'éclairage équipant les véhicules sont régis par des réglementations internationales, qui fixent des intensités maximales et minimales à respecter, par exemple sur un écran placé à distance et dans l'axe du dispositif d'éclairage. Ces réglementations ont pour finalité de simultanément :  The light beams emitted by the lighting devices fitted to the vehicles are governed by international regulations, which fix maximum and minimum intensities to be respected, for example on a screen placed at a distance and in the axis of the lighting device. These regulations are intended to simultaneously:
fournir au conducteur du véhicule équipé de ce dispositif d'éclairage un éclairage satisfaisant de la scène de route sur laquelle il circule, pour qu'il puisse appréhender son environnement dans les meilleures conditions possibles, et éviter d'éblouir les conducteurs d'autres véhicules, qu'ils circulent en sens inverse (véhicules croisés) ou qu'ils circulent dans le même sens (véhicules suivis). Dans le but de répondre à ces finalités réglementaires et dans une optique d'améliorer le confort et la sécurité du conducteur, plusieurs solutions ont été proposées. L'une d'entre elle consiste à utiliser un dispositif d'aide à la conduite composé d'un éclairage puisé synchronisé avec un écran à transmission variable, de façon à ce que l'éclairage atteigne sa valeur maximale quand le coefficient de transmission de l'écran atteint sa valeur maximale, c'est-à-dire une transparence maximale, et de façon à ce que l'éclairage atteigne sa valeur minimale quand le coefficient de transmission de l'écran à transmission variable atteint sa valeur minimale, c'est-à-dire une transparence minimale.  provide the driver of the vehicle equipped with this lighting device with satisfactory illumination of the road scene on which he is traveling, so that he can apprehend his environment in the best possible conditions and avoid dazzling the drivers of other vehicles , that they circulate in opposite direction (crossed vehicles) or that they circulate in the same direction (vehicles followed). In order to meet these regulatory goals and to improve the comfort and safety of the driver, several solutions have been proposed. One of these is to use a driver assistance device consisting of a pulsed lighting synchronized with a variable transmission screen, so that the lighting reaches its maximum value when the transmission coefficient of the screen reaches its maximum value, that is to say a maximum transparency, and so that the illumination reaches its minimum value when the transmission coefficient of the variable transmission screen reaches its minimum value, c that is, minimal transparency.
Ainsi, grâce à cette synchronisation, le conducteur profite pleinement de son éclairage, tout en réduisant les risques d'éblouissement par les sources de lumières extérieures, car la vision du conducteur est fortement amoindrie quand l'écran à transmission variable a sa transparence au minimum. Thus, thanks to this synchronization, the driver takes full advantage of its lighting, while reducing the risk of glare from sources of external lights, because the driver's vision is greatly diminished when the screen to variable transmission has its transparency to a minimum.
D'autre part, l'éclairage puisé n'éblouit pas les autres véhicules puisqu'ils ne perçoivent qu'un éclairement moyen qui est prévu pour être conforme aux réglementations susmentionnées.  On the other hand, pulsed lighting does not dazzle other vehicles since they perceive only average illumination that is expected to comply with the above regulations.
Des problèmes particuliers se posent lorsque le véhicule équipé du dispositif décrit précédemment croise un autre véhicule équipé d'un dispositif du même type. En particulier :  Particular problems arise when the vehicle equipped with the device described above cross another vehicle equipped with a device of the same type. In particular :
Lorsque les deux véhicules sont en antiphase, c'est-à-dire que lorsque le véhicule a son écran à transmission variable qui a son coefficient de transmission au minimum pendant que l'autre véhicule a son éclairage allumé, le conducteur ne voit pas (ou voit beaucoup moins) l'éclairage de l'autre véhicule.  When both vehicles are antiphase, that is to say that when the vehicle has its variable transmission screen which has its transmission coefficient at a minimum while the other vehicle has its lighting on, the driver does not see ( or see much less) the lighting of the other vehicle.
Lorsque les deux véhicules sont en phase, c'est-à-dire que leurs éclairages sont allumés au même moment et que leurs écrans à transmission variables ont leur coefficient de transmission au maximum au même moment, le conducteur peut être gêné par l'éclairage de l'autre véhicule.  When both vehicles are in phase, ie their lights are on at the same time and their variable transmission screens have their maximum transmission coefficient at the same time, the driver may be disturbed by the lighting. from the other vehicle.
L'invention vise à pallier au moins certains des inconvénients des dispositifs d'aide à la conduite connus. Pour ce faire, l'invention concerne un dispositif d'aide à la conduite d'un véhicule automobile, le véhicule étant équipé d'au moins un dispositif d'éclairage apte à émettre un faisceau d'éclairage d'une scène de route en avant du véhicule, ledit dispositif d'aide comprenant un écran à transmission variable, destiné à être disposé entre la scène de route et un conducteur du véhicule, ledit dispositif d'aide étant configuré pour, en phase active, piloter un allumage d'au moins une source lumineuse du dispositif d'éclairage et un coefficient de transmission de l'écran à transmission variable, en relation l'un avec l'autre, par un signal puisé. The invention aims to overcome at least some of the disadvantages of known driving assistance devices. To do this, the invention relates to a device for assisting the driving of a motor vehicle, the vehicle being equipped with at least one lighting device adapted to emit a lighting beam of a road scene in front of the vehicle, said aid device comprising a variable transmission screen, intended to be arranged between the road scene and a driver of the vehicle, said assistance device being configured for, in the active phase, driving an ignition from less a light source of the lighting device and a transmission coefficient of the variable transmission screen, in relation to each other, by a pulsed signal.
Selon l'invention, ledit dispositif d'aide est configuré pour détecter un véhicule équipé d'un dispositif du même type par communication inter véhicules et pour modifier ledit signal puisé de sorte à éviter des phénomènes d'antiphasage et/ou de phasage, lorsque ledit dispositif détecte un tel véhicule On entend par « dispositif du même type » un dispositif d'aide à la conduite d'un véhicule automobile, le véhicule étant équipé d'au moins un dispositif d'éclairage apte à émettre un faisceau d'éclairage d'une scène de route en avant du véhicule, ledit dispositif d'aide comprenant un écran à transmission variable, destiné à être disposé entre la scène de route et un conducteur du véhicule, ledit dispositif d'aide étant configuré pour, en phase active, piloter un allumage d'au moins une source lumineuse du dispositif d'éclairage et un coefficient de transmission de l'écran à transmission variable en synchronisme par un signal puisé qui pourra être le même que celui du premier véhicule. According to the invention, said assistance device is configured to detect a vehicle equipped with a device of the same type by inter-vehicle communication and to modify said pulsed signal so as to avoid antiphasing and / or phasing phenomena, when said device detects such a vehicle "Device of the same type" is understood to mean a device for assisting the driving of a motor vehicle, the vehicle being equipped with at least one lighting device able to emit a lighting beam of a road scene. in front of the vehicle, said assistance device comprising a variable transmission screen, intended to be arranged between the road scene and a driver of the vehicle, said assistance device being configured for, in the active phase, driving an ignition of at least one light source of the lighting device and a transmission coefficient of the transmission screen synchronously variable by a pulsed signal which may be the same as that of the first vehicle.
Un dispositif selon l'invention permet donc d'empêcher les phénomènes d'antiphasage et de phasage en modifiant le signal puisé dès qu'un véhicule équipé d'un dispositif du même type se situe à proximité.  A device according to the invention thus makes it possible to prevent antiphasing and phasing phenomena by modifying the pulsed signal as soon as a vehicle equipped with a device of the same type is in the vicinity.
Dans la suite de la description, on utilisera parfois le terme de « véhicule croisé » pour désigner le véhicule équipé d'un dispositif du même type situé à proximité. Néanmoins, cette désignation ne saurait être restrictive à un véhicule arrivant en face du véhicule équipé du dispositif selon l'invention, mais elle s'applique aussi à tout véhicule équipé d'un dispositif du même type à cause duquel l'apparition de phénomènes d'antiphasage et/ou de phasage peut perturber la conduite du véhicule équipé du dispositif selon l'invention, par exemple un véhicule arrivant de façon latérale sur une intersection, un véhicule suivant derrière ou un véhicule qui effectue un dépassement, le dispositif selon l'invention étant adapté pour détecter la présence de véhicule dans une ou plusieurs des directions où peuvent se trouver ces véhicules.  In the remainder of the description, the term "crossed vehicle" will sometimes be used to designate the vehicle equipped with a device of the same type located nearby. Nevertheless, this designation can not be restrictive to a vehicle arriving in front of the vehicle equipped with the device according to the invention, but it also applies to any vehicle equipped with a device of the same type because of which the appearance of phenomena of antiphasage and / or phasage can disrupt the driving of the vehicle equipped with the device according to the invention, for example a vehicle arriving laterally on an intersection, a following vehicle behind or a vehicle that overtakes, the device according to the invention being adapted to detect the presence of vehicle in one or more of the directions where these vehicles may be.
Avantageusement et selon l'invention, ledit dispositif d'aide comprend des moyens d'échange de données sans fil entre véhicules, pour la détection de véhicules équipés d'un dispositif du même type. Une telle solution assure au dispositif selon l'invention une bonne anticipation. En effet, une communication inter véhicule permet de détecter les véhicules croisés à une grande distance, au moins égale voire supérieure à la portée des feux de route des véhicules croisés, et donc d'opérer la modification selon l'invention du signal puisé avant que les problèmes mentionnés ci-dessus n'apparaissent. De plus, cette solution présente l'avantage de faire appel à des moyens entièrement embarqués dans le véhicule. Avantageusement et selon l'invention, le dispositif détecte la fréquence et/ou le phasage du faisceau d'éclairage provenant du véhicule croisé équipé d'un dispositif du même type. Advantageously and according to the invention, said aid device comprises means for exchanging wireless data between vehicles, for the detection of vehicles equipped with a device of the same type. Such a solution provides the device according to the invention a good anticipation. Indeed, an inter-vehicle communication makes it possible to detect the crossed vehicles at a great distance, at least equal to or even greater than the range of the high beams of the crossed vehicles, and thus to make the modification according to the invention of the pulsed signal before the problems mentioned above do not appear. In addition, this solution has the advantage of using fully embedded means in the vehicle. Advantageously and according to the invention, the device detects the frequency and / or the phasing of the illumination beam coming from the crossed vehicle equipped with a device of the same type.
Selon cet aspect de l'invention, le dispositif d'aide récupère les informations sur la fréquence et/ou le phasage du faisceau d'éclairage provenant du véhicule croisé afin d'adapter la modification du signal puisé en fonction de la fréquence et/ou du phasage détectés.  According to this aspect of the invention, the assistance device retrieves information on the frequency and / or the phasing of the light beam coming from the crossed vehicle in order to adapt the modification of the pulsed signal as a function of the frequency and / or phasing detected.
Avantageusement et selon l'invention, le dispositif d'aide est configuré pour modifier le signal puisé en lui appliquant un déphasage.  Advantageously and according to the invention, the help device is configured to modify the pulsed signal by applying a phase shift.
Selon cet aspect de l'invention, la modification consiste seulement en un changement de phase et permet de travailler à fréquence fixe.  According to this aspect of the invention, the modification consists only in a phase change and allows to work at a fixed frequency.
Avantageusement et selon l'invention, la valeur de déphasage (Phi) est choisie de façon pseudo-aléatoire, par exemple à l'aide de tout générateur de valeurs pseudoaléatoires connu de l'Homme du métier.  Advantageously and according to the invention, the phase shift value (Phi) is chosen in a pseudo-random manner, for example using any pseudo-random value generator known to those skilled in the art.
Selon cet aspect de l'invention, si l'on croise un véhicule équipé d'un dispositif du même type qui utilise aussi une modification de déphasage en cas de croisement, on réduit les risques d'avoir encore des phénomènes d'antiphasage et de phasage qui subsisteraient si les deux véhicules utilisaient les mêmes paramètres de déphasage.  According to this aspect of the invention, if one crosses a vehicle equipped with a device of the same type which also uses a phase shift modification in case of crossing, it reduces the risk of still having antiphasing phenomena and phasing that would remain if both vehicles used the same phase shift parameters.
Avantageusement et selon l'invention, ledit dispositif est configuré pour :  Advantageously and according to the invention, said device is configured for:
- émettre un signal de reconnaissance en cas de détection d'un véhicule équipé d'un dispositif du même type, dit véhicule détecté,  - transmit a recognition signal in the event of detection of a vehicle equipped with a device of the same type, said vehicle detected,
- recevoir un signal d'accusé de réception dudit véhicule détecté,  receiving an acknowledgment signal from said detected vehicle,
- modifier ledit signal puisé à réception dudit accusé de réception.  modifying said pulsed signal on receipt of said acknowledgment of receipt.
Selon cet aspect de l'invention, un seul des véhicules modifie son signal puisé et on évite de la sorte que la même modification soit apportée aux véhicules en cours de croisement.  According to this aspect of the invention, only one of the vehicles modifies its pulsed signal and this avoids the same modification being made to the vehicles being crossed.
Avantageusement et selon l'invention, le dispositif est configuré pour piloter le coefficient de transmission de l'écran à transmission variable de sorte que la transparence de l'écran à transmission variable soit maximale, lorsque le dispositif détecte un faisceau d'éclairage provenant d'un véhicule croisé équipé d'un dispositif du même type. Selon cet aspect de l'invention, on rend l'écran transparent tout en préservant un éclairage puisé, ce qui permet au conducteur de voir toutes les sources de lumières sans ou avec très peu d'atténuation, et notamment de voir l'éclairage du véhicule croisé et ainsi éviter un phénomène d'antiphasage entre les deux véhicules. Le coefficient de transmission pourra cependant prendre en compte un niveau de luminosité. A ce sujet, on notera que, selon l'invention, le synchronisme entre le coefficient de transmission et l'allumage de la ou des sources lumineuses est avantageusement actif, sauf dans des cas tel que celui donné plus haut, qui n'est qu'un exemple. Advantageously and according to the invention, the device is configured to control the transmission coefficient of the variable transmission screen so that the transparency of the variable transmission screen is maximum, when the device detects a light beam coming from a crossover vehicle equipped with a device of the same type. According to this aspect of the invention, the screen is made transparent while preserving pulsed lighting, which allows the driver to see all light sources without or with very little attenuation, and in particular to see the lighting of the light. crossed vehicle and thus avoid a phenomenon of antiphasage between the two vehicles. The transmission coefficient may however take into account a brightness level. In this regard, it should be noted that, according to the invention, the synchronism between the transmission coefficient and the ignition of the light source (s) is advantageously active, except in cases such as the one given above, which is only 'an example.
Avantageusement et selon l'invention, le signal puisé est périodique de période T.  Advantageously and according to the invention, the pulsed signal is periodic of period T.
Avantageusement et selon l'invention, la moyenne du signal puisé pendant la période T après modification dudit signal est la même que la moyenne du signal puisé pendant cette même période T avant modification dudit signal. On reste alors avantageusement en synchronisme.  Advantageously and according to the invention, the average of the signal pulsed during the period T after modification of said signal is the same as the average of the signal pulsed during this same period T before modification of said signal. We then remain advantageously in synchronism.
Selon cet aspect de l'invention, toute modification effectuée au signal n'aura pas d'effet sur la valeur moyenne des grandeurs en cause. Notamment, la puissance moyenne de l'allumage sera constante quelle que soit la modification, ce qui permet de bénéficier de la même luminosité pour le conducteur et de rester conforme aux réglementations en termes d'éclairage.  According to this aspect of the invention, any modification made to the signal will have no effect on the average value of the quantities involved. In particular, the average power of the ignition will be constant whatever the modification, which allows to benefit from the same brightness for the driver and to remain compliant with the regulations in terms of lighting.
Avantageusement et selon l'invention, ledit dispositif d'aide est configuré pour détecter simultanément plusieurs véhicules équipés dudit dispositif du même type et pour fonctionner en réseau avec lesdits véhicules. On peut de la sorte obtenir une modification des signaux puisés de l'ensemble des véhicules qui soit cohérente avec l'objectif à atteindre.  Advantageously and according to the invention, said assistance device is configured to simultaneously detect several vehicles equipped with said device of the same type and to operate in network with said vehicles. In this way, it is possible to obtain a modification of the pulsed signals of all the vehicles that is consistent with the objective to be achieved.
Avantageusement et selon l'invention, le dispositif comprend une centrale de commande adaptée pour transmettre le signal puisé au dispositif d'éclairage et/ou à l'écran à transmission variable. Ladite centrale de commande pourra également être adaptée à prendre en charge et exploiter la communication inter véhicules.  Advantageously and according to the invention, the device comprises a control unit adapted to transmit the pulsed signal to the lighting device and / or the variable transmission screen. Said control unit may also be adapted to support and operate inter-vehicle communication.
Avantageusement et selon l'invention, la centrale de commande comprend un émetteur d'ondes de télécommandes apte à transmettre le signal puisé à destination d'un récepteur dudit écran à transmission variable, ledit récepteur étant apte à commander le coefficient de transmission de l'écran à transmission variable. Advantageously and according to the invention, the control unit comprises a remote control wave transmitter capable of transmitting the pulsed signal to a receiver of said variable transmission screen, said receiver being able to control the transmission coefficient of the variable transmission screen.
Avantageusement et selon l'invention, l'émetteur d'onde de télécommande est configuré pour transmettre le signal puisé selon un protocole de communication sans-fil.  Advantageously and according to the invention, the remote control wave transmitter is configured to transmit the pulsed signal according to a wireless communication protocol.
Avantageusement et selon l'invention, le signal puisé est variable selon un mode de Modulation de Largeur d'Impulsions (PWM).  Advantageously and according to the invention, the pulsed signal is variable according to a Pulse Width Modulation (PWM) mode.
Avantageusement et selon l'invention, l'écran à transmission variable est constitué :  Advantageously and according to the invention, the variable transmission screen consists of:
par le pare-brise du véhicule,  by the windshield of the vehicle,
par un écran disposé entre le pare-brise du véhicule et le conducteur du véhicule, ou  by a screen disposed between the windshield of the vehicle and the driver of the vehicle, or
par des lunettes portées par le conducteur du véhicule.  by glasses worn by the driver of the vehicle.
L'invention concerne également un procédé d'aide à la conduite d'un véhicule automobile, le véhicule étant équipé d'au moins un dispositif d'éclairage apte à émettre un faisceau d'éclairage d'une scène de route en avant du véhicule, et d'un écran à transmission variable, destiné à être disposé entre la scène de route et un conducteur du véhicule, ledit procédé comprenant une étape de pilotage en relation l'un avec l'autre d'un allumage d'au moins une source lumineuse du dispositif d'éclairage et d'un coefficient de transmission de l'écran à transmission variable, par un signal puisé. The invention also relates to a method of assisting the driving of a motor vehicle, the vehicle being equipped with at least one lighting device adapted to emit a lighting beam of a road scene in front of the vehicle , and a screen with variable transmission, intended to be arranged between the road scene and a driver of the vehicle, said method comprising a driving step in relation to each other of an ignition of at least one light source of the lighting device and a transmission coefficient of the screen with variable transmission, by a pulsed signal.
Selon l'invention, le procédé contient une étape de détection d'un véhicule mettant en œuvre un procédé du même type, par communication inter véhicules, notamment par échange de données sans fil, et une étape de modification dudit signal puisé de sorte à éviter des phénomènes d'antiphasage et/ou de phasage lorsqu'un tel véhicule est détecté.  According to the invention, the method contains a step of detecting a vehicle implementing a method of the same type, by inter-vehicle communication, in particular by wireless data exchange, and a step of modifying said pulsed signal so as to avoid phasing and / or phasing phenomena when such a vehicle is detected.
Un procédé selon l'invention permet donc d'empêcher les phénomènes d'antiphasage et de phasage en modifiant le signal puisé s'il y a présence à proximité d'un véhicule mettant en œuvre un procédé du même type.  A method according to the invention thus makes it possible to prevent antiphasing and phasing phenomena by modifying the pulsed signal if there is presence in the vicinity of a vehicle implementing a method of the same type.
Avantageusement et selon l'invention, ladite étape de détection du croisement d'un véhicule comprend une étape de détection de la fréquence et du phasage du faisceau d'éclairage dudit véhicule croisé.  Advantageously and according to the invention, said step of detecting the intersection of a vehicle comprises a step of detecting the frequency and the phasing of the illumination beam of said crossed vehicle.
Avantageusement et selon l'invention, ladite étape de modification comprend une étape de déphasage dudit signal puisé. Advantageously and according to the invention, said modification step comprises a phase shift step of said pulsed signal.
Avantageusement et selon l'invention, la valeur de déphasage (Phi) est choisie de façon pseudo-aléatoire.  Advantageously and according to the invention, the phase shift value (Phi) is chosen pseudo-randomly.
Avantageusement et selon l'invention, l'étape de pilotage du coefficient de transmission maximise ledit coefficient de transmission de sorte que l'écran soit transparent, lors du croisement d'un véhicule mettant en œuvre un procédé du même type.  Advantageously and according to the invention, the step of controlling the transmission coefficient maximizes said transmission coefficient so that the screen is transparent, when crossing a vehicle implementing a method of the same type.
Avantageusement et selon l'invention, le signal puisé est périodique de période T lors du fonctionnement en pilotage synchronisé.  Advantageously and according to the invention, the pulsed signal is periodic of period T when operating in synchronized control.
Avantageusement et selon l'invention, la moyenne du signal puisé pendant la période T après ladite étape de modification est la même que la moyenne du signal puisé pendant cette même période T avant ladite étape de modification.  Advantageously and according to the invention, the average of the pulsed signal during the period T after said modifying step is the same as the average of the signal pulsed during this same period T before said modifying step.
Avantageusement et selon l'invention, le procédé d'aide comprend une étape de transmission du signal puisé au dispositif d'éclairage et à l'écran à transmission variable.  Advantageously and according to the invention, the aid method comprises a step of transmitting the pulsed signal to the lighting device and to the variable transmission screen.
Avantageusement et selon l'invention, l'étape de transmission du signal puisé se fait selon un protocole de communication sans-fil.  Advantageously and according to the invention, the step of transmitting the pulsed signal is done according to a wireless communication protocol.
Avantageusement et selon l'invention, le signal puisé est variable selon un mode de Modulation de Largeur d'Impulsions.  Advantageously and according to the invention, the pulsed signal is variable according to a pulse width modulation mode.
Avantageusement et selon l'invention, ledit procédé comprend les étapes : Advantageously and according to the invention, said method comprises the steps:
- d'émission d'un signal de reconnaissance en cas de détection d'un véhicule mettant en œuvre un procédé du même type, dit véhicule détecté, emission of a recognition signal in the event of detection of a vehicle implementing a method of the same type, said detected vehicle,
- de réception d'un signal d'accusé de réception dudit véhicule détecté, ladite étape de modification du signal puisé ayant lieu à réception dudit accusé de réception.  receiving an acknowledgment signal from said detected vehicle, said step of modifying the pulsed signal taking place on receipt of said acknowledgment of receipt.
Avantageusement et selon l'invention, ledit procédé comprend une étape de détection simultanée de plusieurs véhicules mettant en œuvre ledit procédé et une étape de fonctionnement en réseau avec lesdits véhicules. L'invention concerne également un dispositif d'aide et un procédé d'aide caractérisés en combinaison par tout ou partie des caractéristiques mentionnées ci- dessus ou ci-après. Advantageously and according to the invention, said method comprises a step of simultaneous detection of several vehicles implementing said method and a step of network operation with said vehicles. The invention also relates to an aid device and an aid method characterized in combination by all or some of the characteristics mentioned above. above or below.
D'autres buts, caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante donnée à titre uniquement non limitatif et qui se réfère aux figures annexées dans lesquelles : Other objects, features and advantages of the invention will become apparent on reading the following description given solely by way of non-limiting example and which refers to the appended figures in which:
la figure 1 est une vue schématique en coupe partielle d'un véhicule comprenant un dispositif d'aide à la conduite selon un mode de réalisation de l'invention, la figure 2 est une vue schématique du dispositif d'aide de la figure 1 selon un mode de réalisation de l'invention,  FIG. 1 is a schematic partial sectional view of a vehicle comprising a driving assistance device according to one embodiment of the invention, FIG. 2 is a schematic view of the assistance device of FIG. an embodiment of the invention,
- la figure 3 est un diagramme de l'évolution temporelle de différents signaux émis par un dispositif conforme à l'invention, en cas de croisement d'un véhicule équipé d'un dispositif du même type. FIG. 3 is a diagram of the temporal evolution of different signals emitted by a device according to the invention, in the case of crossing a vehicle equipped with a device of the same type.
La figure 1 représente de façon schématique en coupe partielle un véhicule 20 comprenant un dispositif d'aide à la conduite selon un mode de réalisation de l'invention. Le véhicule 20 est équipé de manière conventionnelle par un dispositif d'éclairage 22 apte à émettre un faisceau d'éclairage d'une scène de route SR grâce à une source lumineuse, et est piloté par un conducteur, symbolisé par son œil 24. La scène de route correspond à ce qu'observe le conducteur 24 du véhicule 20. Le conducteur 24 observe ici la scène de route devant le véhicule 20 et à travers le pare- brise 26. Figure 1 schematically shows in partial section a vehicle 20 comprising a driver assistance device according to one embodiment of the invention. The vehicle 20 is conventionally equipped by a lighting device 22 able to emit a light beam of a road scene SR by means of a light source, and is piloted by a driver, symbolized by its eye 24. The road scene corresponds to what the driver 24 of the vehicle 20 observes. The driver 24 observes here the road scene in front of the vehicle 20 and through the windshield 26.
Un écran à transmission variable est disposé dans le champ de vision du conducteur 24, entre ce dernier et la scène de route. Selon différents modes de réalisation de l'invention, l'écran à transmission variable peut être constitué :  A variable transmission screen is disposed in the field of view of the driver 24, between the latter and the road scene. According to various embodiments of the invention, the variable transmission screen may consist of:
- d'un écran F proprement dit, placé entre le conducteur 24 et le pare-brise 26, par exemple rabattable à la façon d'un pare-soleil, a screen F itself placed between the conductor 24 and the windshield 26, for example folding like a sun visor,
du pare-brise 26 lui-même, ou  windshield 26 itself, or
d'une paire de lunettes 28, portées par le conducteur 24, à l'instar de lunettes de soleil ou lunettes correctrices, un seul verre de lunette ayant été représenté sur la figure 1. Ces trois modes de réalisation ont été représentés simultanément sur la figure 1, pour la commodité de l'exposé. Ce ne sont cependant que des variantes de réalisation, chacun d'entre eux tendant à obtenir le même résultat. Dans la suite de la description, le terme « écran à transmission variable » sera utilisé pour désigner indifféremment l'un de ces trois modes de réalisation. a pair of glasses 28, worn by the driver 24, like sunglasses or corrective glasses, a single spectacle lens having been shown in Figure 1. These three embodiments have been shown simultaneously in FIG. 1, for the convenience of the disclosure. However, these are only alternative embodiments, each of them tending to obtain the same result. In the remainder of the description, the term "variable transmission screen" will be used to denote one of these three embodiments.
Quel que soit le mode de réalisation, le dispositif d'aide, quand il est en phase active (c'est-à-dire en fonctionnement), pilote le coefficient de transmission de l'écran à transmission variable et la source lumineuse du dispositif d'éclairage 22 du véhicule 20. Un tel pilotage se fait en synchronisme, au moins quand aucun véhicule équipé d'un dispositif du même type n'est présent à proximité. Cela a pour but que l'écran à transmission variable ait son coefficient de transmission au maximum (c'est-à-dire que la transparence de l'écran est au maximum) quand le dispositif d'éclairage 22 est allumé, et donc que le conducteur 24 voit la scène de route éclairée par son dispositif d'éclairage 22. Cela a aussi pour but que l'écran à transmission variable ait son coefficient de transmission au minimum (c'est-à-dire que la transparence de l'écran est au minimum) quand le dispositif d'éclairage 22 est éteint, et donc que les éclairages extérieurs de la scène de route soit atténués, en particulier ceux des véhicules croisés.  Whatever the embodiment, the aid device, when it is in the active phase (that is to say in operation), controls the transmission coefficient of the variable transmission screen and the light source of the device. 22 Such a steering is synchronism, at least when no vehicle equipped with a device of the same type is present in the vicinity. This is to ensure that the variable transmission screen has its maximum transmission coefficient (i.e., the screen transparency is at a maximum) when the lighting device 22 is turned on, and therefore that the driver 24 sees the road scene illuminated by his lighting device 22. It is also the purpose of the variable transmission screen to have its transmission coefficient at the minimum (that is to say, the transparency of the screen is at least) when the lighting device 22 is off, and therefore the external lights of the road scene is attenuated, especially those of crossed vehicles.
Pour ce faire, le dispositif comprend ici une centrale de commande 30 qui génère un signal puisé destiné à commander le dispositif d'éclairage 22 et l'écran à transmission variable.  To do this, the device here comprises a control unit 30 which generates a pulsed signal for controlling the lighting device 22 and the variable transmission screen.
La centrale de commande 30 pourra être reliée à un circuit de gestion 32 qui commande l'alimentation du dispositif d'allumage de manière à ce que ledit dispositif émette un faisceau d'intensité variable entre une valeur maximale et une valeur minimale périodiquement variable selon le signal puisé.  The control unit 30 may be connected to a management circuit 32 which controls the power supply of the ignition device so that said device emits a beam of variable intensity between a maximum value and a minimum value which is periodically variable according to the pulsed signal.
La centrale de commande 30 pourra aussi reliée à un circuit de commande du coefficient de transmission 34 pour la transmission du signal puisé. Si l'écran à transmission variable est mobile ou éloigné de la centrale de commande 30 (dans le cas de l'utilisation des lunettes 28 ou de l'écran F par exemple), la transmission du signal puisé peut s'effectuer par une liaison sans-fil, en utilisant un protocole de communication sans-fil déterminé, comme par exemple selon les normes IEEE 802.15.1 ainsi que toutes ses extensions (communément dénommé par la marque déposée Bluetooth) ou IEEE 802.11 (communément dénommé par la marque déposée Wi-Fi).The control unit 30 may also be connected to a control circuit of the transmission coefficient 34 for the transmission of the pulsed signal. If the variable transmission screen is movable or remote from the control unit 30 (in the case of the use of the glasses 28 or the screen F for example), the transmission of the pulsed signal can be effected by a link wireless, using a determined wireless communication protocol, as for example according to IEEE 802.15.1 standards and all its extensions (commonly known by the trademark Bluetooth) or IEEE 802.11 (commonly known as Wi-Fi).
Si la transmission du signal puisé de la centrale de commande 30 à l'écran à transmission variable est effectuée sans-fil, le circuit de commande du coefficient de transmission 34 comprend, par exemple, un émetteur d'ondes de télécommande 38, et l'écran à transmission variable est pourvu, par exemple, d'un récepteur 40 de ces mêmes ondes de télécommande. Le récepteur 40 commande alors le coefficient de transmission variable de l'écran, dans le sens où il applique à l'écran de transmission variable les ordres déterminés correspondant au signal puisé. La figure 2 est une vue schématique du dispositif d'aide selon un mode de réalisation de l'invention utilisant une transmission sans-fil. If the transmission of the pulsed signal from the control unit 30 to the variable transmission screen is performed wirelessly, the transmission coefficient control circuit 34 comprises, for example, a remote control wave transmitter 38, and The variable transmission screen is provided, for example, with a receiver 40 of these same remote control waves. The receiver 40 then controls the variable transmission coefficient of the screen, in the sense that it applies to the variable transmission screen the determined orders corresponding to the pulsed signal. Figure 2 is a schematic view of the aid device according to one embodiment of the invention using a wireless transmission.
La centrale de commande 30 comprend un microcontrôleur qui fournit un signal puisé de fréquence fixe et de déphasage nul. Ce signal puisé non modifié est transmis au circuit de commande du coefficient de transmission 34 par le biais de la connexion 42, et est transmis au circuit de gestion 32.  The control unit 30 comprises a microcontroller which provides a pulsed signal of fixed frequency and zero phase shift. This unmodified pulsed signal is transmitted to the control circuit of the transmission coefficient 34 via the connection 42, and is transmitted to the management circuit 32.
La centrale de commande 30 reçoit aussi les données provenant de moyens 44 d'échanges de données sans fil entre véhicules. Lesdits moyens sont configurés pour émettre et recevoir des données, en particulier des données d'identification, vers ou de véhicules présentant le même équipement. Il pourra en particulier s'agir d'échanges de données selon la norme connue sous le nom « Bluetooth » déjà évoquée plus haut. Lorsque lesdits moyens 44 d'échange de données reçoivent des données d'un autre véhicule, le dispositif sait alors qu'un véhicule équipé d'un dispositif du même type est à proximité et que le signal puisé de l'un au moins des deux véhicules doit être modifié. En plus de l'identification des signaux lumineux puisés, les moyens 44 d'échange de données pourront être configurés pour récupérer la fréquence et/ou la phase du faisceau lumineux du véhicule croisé.  The control unit 30 also receives data from means 44 for wireless data exchange between vehicles. Said means are configured to transmit and receive data, in particular identification data, to or from vehicles having the same equipment. It may in particular be exchanges of data according to the standard known as "Bluetooth" already mentioned above. When said data exchange means 44 receive data from another vehicle, the device then knows that a vehicle equipped with a device of the same type is nearby and that the pulsed signal from at least one of the two vehicles must be modified. In addition to the identification of the pulsed light signals, the data exchange means 44 may be configured to recover the frequency and / or the phase of the light beam of the crossed vehicle.
S'il n'y a pas de croisement détecté, le microcontrôleur 30 continue de fournir le signal puisé non modifié au circuit de commande du coefficient de transmission 34 et au circuit de gestion 32. S'il y a détection du croisement d'un véhicule équipé d'un dispositif du même type, le microcontrôleur peut utiliser les données de fréquence et de phasage du faisceau lumineux du véhicule croisé pour modifier le signal puisé de façon adaptée. If there is no crossover detected, the microcontroller 30 continues to supply the unmodified pulsed signal to the control circuit of the transmission coefficient 34 and to the management circuit 32. If there is detection of the crossing of a vehicle equipped with a device of the same type, the microcontroller can use the frequency and phasing data of the light beam of the crossed vehicle to modify the pulsed signal so adapted.
Par exemple, la modification peut consister en un changement de fréquence et/ou de phase, connaissant la fréquence et la phase du véhicule croisé.  For example, the modification may consist of a change of frequency and / or phase, knowing the frequency and the phase of the crossed vehicle.
Dans un mode de réalisation, la modification peut consister en un déphasage seul, ce qui permet de travailler à fréquence fixe. Le déphasage peut être choisi en fonction de la phase du véhicule croisé, ou bien de façon pseudo-aléatoire afin d'éviter que, si le véhicule croisé procède aussi à une modification de phase suite à la détection du croisement, les déphasages utilisés par les deux véhicules soient identiques.  In one embodiment, the modification may consist of a single phase shift, which makes it possible to work at a fixed frequency. The phase shift can be chosen according to the phase of the crossed vehicle, or in a pseudo-random manner so that, if the crossed vehicle also makes a phase change following the detection of the crossing, the phase shifts used by the two vehicles are identical.
Dans un autre mode de réalisation, notamment dans le cas où un antiphasage est détecté, le microcontrôleur peut décider d'envoyer une commande au circuit de commande du coefficient de transmission 34, par exemple par le biais de la connexion 42, et à la réception de cette commande, le circuit de commande du coefficient de transmission 34 va transmettre à l'écran à transmission variable un coefficient de transmission au maximum pendant toute la durée du croisement. Selon un autre mode de réalisation, le microcontrôleur peut décider de suspendre l'envoi du signal puisé au circuit de commande du coefficient de transmission 34, et d'envoyer à la place un signal continu pour que le coefficient de transmission de l'écran à transmission variable soit au maximum, c'est-à-dire que la transparence de l'écran à transmission variable est au maximum. Dans ce dernier cas, le synchronisme du pilotage de la source lumineuse du dispositif d'éclairage et du coefficient de transmission de l'écran à transmission variable est suspendu pendant la période de croisement. Ainsi l'écran à transmission variable reste à sa transparence maximale tout en conservant un éclairage puisé. Le conducteur 24 profite alors d'une scène de route sans atténuation de la luminosité, quelle que soit la source de lumière. Le niveau de luminosité pourra avantageusement être également pris en compte pour régler le coefficient de transmission.  In another embodiment, in particular in the case where an antiphase is detected, the microcontroller may decide to send a command to the control circuit of the transmission coefficient 34, for example via the connection 42, and at the reception from this command, the control circuit of the transmission coefficient 34 will transmit to the variable transmission screen a maximum transmission coefficient throughout the duration of the crossing. According to another embodiment, the microcontroller may decide to suspend the sending of the pulsed signal to the control circuit of the transmission coefficient 34, and to send instead a continuous signal so that the transmission coefficient of the screen to variable transmission is at most, that is to say that the transparency of the variable transmission screen is at maximum. In the latter case, the synchronism of the control of the light source of the lighting device and the transmission coefficient of the variable transmission screen is suspended during the crossing period. Thus the variable transmission screen remains at its maximum transparency while maintaining a pulsed lighting. The driver 24 then enjoys a road scene without attenuation of brightness, regardless of the light source. The brightness level may advantageously also be taken into account to adjust the transmission coefficient.
Cela étant, il pourra être avantageux qu'un seul des véhicules en cours de croisement modifie son signal puisé afin d'éviter que la même modification soit mise en œuvre par les deux véhicules. A cette fin, ledit dispositif est configuré pour :  However, it may be advantageous that only one of the vehicles in the process of crossing changes its pulsed signal to prevent the same modification being implemented by the two vehicles. For this purpose, said device is configured to:
- émettre un signal de reconnaissance en cas de détection d'un véhicule équipé d'un dispositif du même type, dit véhicule détecté,  - transmit a recognition signal in the event of detection of a vehicle equipped with a device of the same type, said vehicle detected,
- recevoir un signal d'accusé de réception dudit véhicule détecté, - modifier ledit signal puisé à réception dudit accusé de réception. receiving an acknowledgment signal from said detected vehicle, modifying said pulsed signal on receipt of said acknowledgment of receipt.
Parallèlement, le dispositif du véhicule ayant émis l'accusé de réception s'abstiendra de modifier son signal puisé.  In parallel, the device of the vehicle having issued the acknowledgment of receipt will abstain from modifying its pulsed signal.
Ledit dispositif d'aide pourra également être configuré pour prendre en compte la présence de plusieurs véhicules en fonctionnant en réseau.  Said help device may also be configured to take into account the presence of several vehicles operating in a network.
Le fait que le dispositif d'aide selon l'invention utilise des moyens 44 d'échange de données sans fil entre véhicules pour la détection de véhicules équipés d'un dispositif du même type assure notamment au dispositif une bonne anticipation : une communication inter véhicule permet en effet de détecter les véhicules croisés à une grande distance, au moins égale voire supérieure à la portée des feux de route des véhicules croisés, et donc d'opérer la modification selon l'invention du signal puisé avant que les phénomènes de phasage et/ou d'anti phasage n'apparaissent, ce que ne permettraient pas des capteurs optiques, par exemple.  The fact that the aid device according to the invention uses means 44 for wireless data exchange between vehicles for the detection of vehicles equipped with a device of the same type ensures in particular the device a good anticipation: an inter-vehicle communication makes it possible to detect the crossed vehicles at a great distance, at least equal to or even greater than the range of the high beams of the crossed vehicles, and thus to make the modification according to the invention of the pulsed signal before the phasing phenomena and / or anti phasage do not appear, which would not allow optical sensors, for example.
La figure 3 est un diagramme de l'évolution temporelle de différents signaux en cas de croisement d'un véhicule équipé d'un dispositif du même type. Dans ces diagrammes, le début de l'événement « croisement d'un véhicule équipé d'un dispositif de même type » est représenté par la ligne en pointillés référencé E. Au contraire, la fin de cet événement est représenté par la ligne en pointillés référencé E'. Trois signaux sont représentés : A représente un signal puisé qui ne subit pas de modification, et qui sert en outre de témoin pour représenter le comportement habituel du signal lorsqu'il n'y a pas de croisement. B représente un signal puisé après l'application d'un type de modification suite à la détection d'un véhicule croisé représenté par l'événement E. Enfin, C représente un signal transmis par le circuit de commande du coefficient de transmission 34 à l'écran à transmission variable, après l'application d'un autre type de modification suite à la détection d'un véhicule croisé représenté par l'événement E.  Figure 3 is a diagram of the time evolution of different signals in case of crossing a vehicle equipped with a device of the same type. In these diagrams, the beginning of the event "crossing of a vehicle equipped with a device of the same type" is represented by the dotted line referenced E. On the contrary, the end of this event is represented by the dashed line referenced'. Three signals are represented: A represents a pulsed signal which does not undergo modification, and which also serves as a control to represent the usual behavior of the signal when there is no crossing. B represents a pulsed signal after the application of a type of modification following the detection of a crossed vehicle represented by the event E. Finally, C represents a signal transmitted by the control circuit of the transmission coefficient 34 to the variable transmission screen, after the application of another type of modification following the detection of a crossed vehicle represented by the event E.
Le signal A est un signal puisé périodique de période T et de rapport cyclique 0,5, c'est-à-dire que le signal est à son niveau maximal pendant la moitié de la période, soit T/2. Le signal A représentant un signal puisé qui ne subit pas de modification, celui-ci peut aussi représenter le signal puisé d'un véhicule croisé équipé d'un dispositif du même type qui ne détecte pas le croisement du véhicule 20 équipé d'un dispositif d'aide selon l'invention et donc qui ne procède à aucune modification de son signal puisé. L'intervalle de temps entre l'événement E et l'événement E' correspond dans ce cas à l'intervalle de temps où les véhicules se croisent et sont donc susceptibles de subir des phénomènes d'antiphasage et/ou de phasage de leurs signaux puisés si aucune modification n'était apportée à au moins l'un des deux. The signal A is a periodic pulsed signal of period T and duty cycle 0.5, that is to say that the signal is at its maximum level during half the period, ie T / 2. Since the signal A represents a pulsed signal which is not modified, it may also represent the pulsed signal of a crossover vehicle equipped with a device of the same type which does not detect the crossing of the vehicle 20 equipped with a device. aid according to the invention and therefore does not make any change to its pulsed signal. The time interval between the event E and the event E 'corresponds in this case to the time interval where the vehicles cross each other and are therefore susceptible to antiphase phenomena and / or phasing of their signals. pulsed if no changes were made to at least one of them.
Le signal B représente un signal puisé périodique de période T et de rapport cyclique 0,5, modifié selon un premier mode de réalisation de l'invention : ce signal B est un signal puisé qui est modifié en appliquant un déphasage Phi au croisement d'un véhicule équipé d'un dispositif de même type, représenté par l'événement E. Ce déphasage permet, entre l'événement E et l'événement E', de modifier la phase du signal pour qu'il ne soit plus en antiphase ou en phase avec un véhicule croisé. En comparant le signal A et le signal B, les signaux sont en phase avant l'événement E et après l'événement E', mais ce phasage est évité entre l'événement E et l'événement E', c'est-à-dire pendant la période où les deux véhicules se croisent. On reste ici en synchronisme et ledit signal puisé B est utilisé à la fois pour le coefficient de transmission et l'éclairage.  Signal B represents a periodic pulsed signal of period T and a duty cycle 0.5, modified according to a first embodiment of the invention: this signal B is a pulsed signal which is modified by applying a phase shift Phi at the crossover of a vehicle equipped with a device of the same type, represented by the event E. This phase shift makes it possible, between the event E and the event E ', to modify the phase of the signal so that it is no longer in antiphase or in phase with a crossover vehicle. By comparing the signal A and the signal B, the signals are in phase before the event E and after the event E ', but this phasing is avoided between the event E and the event E', that is to say say during the period when the two vehicles cross each other. It remains here in synchronism and said pulsed signal B is used for both the transmission coefficient and the lighting.
Le signal C représente le signal transmis par le circuit de commande du coefficient de transmission 34 à l'écran à transmission variable, modifié par un second mode de réalisation de l'invention : lorsqu'il n'y a pas croisement d'un véhicule équipé d'un dispositif du même type, c'est-à-dire avant l'événement E et après l'événement E', le signal C est identique au signal puisé transmis par le microcontrôleur. Lors d'un croisement, c'est-à-dire entre l'événement E et l'événement E', le microcontrôleur va envoyer une commande au circuit de commande du coefficient de transmission 34, par exemple par le biais de la connexion 42, et à la réception de cette commande, le circuit de commande du coefficient de transmission 34 va transmettre à l'écran à transmission variable un coefficient de transmission au maximum pendant toute la durée du croisement. L'écran à transmission variable a alors sa transparence au maximum pendant toute la durée du croisement. Cette modification est particulièrement adaptée quand il se produit un phénomène d'antiphasage : le fait que l'écran à transmission variable ait sa transparence au maximum permet que tous les éclairages extérieurs, et donc l'éclairage du véhicule croisé, soient parfaitement visibles. Avantageusement, le dispositif selon l'invention met en œuvre le procédé selon l'invention. The signal C represents the signal transmitted by the transmission coefficient control circuit 34 to the variable transmission screen, modified by a second embodiment of the invention: when there is no crossing of a vehicle equipped with a device of the same type, that is to say before the event E and after the event E ', the signal C is identical to the pulsed signal transmitted by the microcontroller. During a crossover, that is to say between the event E and the event E ', the microcontroller will send a command to the control circuit of the transmission coefficient 34, for example through the connection 42 , and upon receipt of this command, the control circuit of the transmission coefficient 34 will transmit to the variable transmission screen a maximum transmission coefficient throughout the duration of the crossing. The variable transmission screen then has its maximum transparency throughout the duration of the crossing. This modification is particularly suitable when there is an antiphase phenomenon: the fact that the variable transmission screen has maximum transparency allows all external lighting, and thus the illumination of the crossed vehicle, to be perfectly visible. Advantageously, the device according to the invention implements the method according to the invention.
Avantageusement, le procédé selon l'invention est mis en œuvre par le dispositif selon l'invention.  Advantageously, the method according to the invention is implemented by the device according to the invention.
Avantageusement, l'étape de transmission du signal puisé est mise en œuvre par l'émetteur d'ondes de télécommande du dispositif d'aide selon l'invention.  Advantageously, the pulsed signal transmission step is implemented by the remote control wave transmitter of the aid device according to the invention.
Avantageusement, l'émetteur d'ondes de télécommandes du dispositif d'aide selon l'invention met en œuvre l'étape de transmission du signal puisé du procédé d'aide selon l'invention.  Advantageously, the remote control wave transmitter of the aid device according to the invention implements the step of transmitting the pulsed signal of the aid method according to the invention.

Claims

REVENDICATIONS
Dispositif d'aide à la conduite d'un véhicule automobile (20), le véhicule (20) étant équipé d'au moins un dispositif d'éclairage (22) apte à émettre un faisceau d'éclairage d'une scène de route (SR) en avant du véhicule (20), ledit dispositif d'aide comprenant un écran à transmission variable (26 ; 28 ; F), destiné à être disposé entre la scène de route (SR) et un conducteur (24) du véhicule, ledit dispositif d'aide étant configuré pour, en phase active, piloter un allumage d'au moins une source lumineuse du dispositif d'éclairage (22) et un coefficient de transmission de l'écran à transmission variable (26 ; 28 ; F), en relation l'un avec l'autre, par un signal puisé, caractérisé en ce que ledit dispositif d'aide est configuré pour détecter un véhicule équipé d'un dispositif du même type par communication inter véhicules et pour modifier ledit signal puisé de sorte à éviter des phénomènes d'antiphasage et/ou de phasage, lorsque ledit dispositif détecte un tel véhicule. Device for assisting the driving of a motor vehicle (20), the vehicle (20) being equipped with at least one lighting device (22) able to emit a lighting beam of a road scene ( SR) in front of the vehicle (20), said assist device comprising a variable transmission screen (26; 28; F), to be arranged between the road scene (SR) and a driver (24) of the vehicle, said aid device being configured for, in the active phase, driving an ignition of at least one light source of the lighting device (22) and a transmission coefficient of the variable transmission screen (26; 28; F) , in relation to each other, by a pulsed signal, characterized in that said aid device is configured to detect a vehicle equipped with a device of the same type by inter-vehicle communication and to modify said pulsed signal of so as to avoid antiphase and / or phasing phenomena, when said device detects such a vehicle.
Dispositif d'aide selon la revendication 1, caractérisé en ce que ledit dispositif d'aide comprend des moyens d'échange de données sans fil entre véhicules. Assist device according to claim 1, characterized in that said aid device comprises means for wireless data exchange between vehicles.
Dispositif d'aide selon l'une des revendications précédentes, caractérisé en ce que ledit dispositif détecte la fréquence et/ou le phasage du faisceau d'éclairage provenant du véhicule croisé équipé d'un dispositif du même type. Assist device according to one of the preceding claims, characterized in that said device detects the frequency and / or phasing of the illumination beam from the crossed vehicle equipped with a device of the same type.
Dispositif d'aide selon l'une des revendications précédentes, caractérisé en ce qu'il est configuré pour modifier le signal puisé en lui appliquant un déphasage. Assist device according to one of the preceding claims, characterized in that it is configured to modify the pulsed signal by applying a phase shift.
5. Dispositif d'aide selon la revendication 4, caractérisé en ce que la valeur de déphasage (Phi) est choisie de façon pseudo-aléatoire. 5. Assist device according to claim 4, characterized in that the phase shift value (Phi) is chosen pseudo-randomly.
6. Dispositif d'aide selon l'une des revendications 1 à 3, caractérisé en ce qu'il est configuré pour piloter le coefficient de transmission de l'écran à transmission variable de sorte que la transparence de l'écran à transmission variable soit maximale, lorsqu'un faisceau d'éclairage provenant d'un véhicule croisé équipé d'un dispositif du même type est détecté. 6. A device according to one of claims 1 to 3, characterized in that it is configured to control the transmission coefficient of the variable transmission screen so that the transparency of the variable transmission screen is maximum, when a light beam from a crossover vehicle equipped with a device of the same type is detected.
7. Dispositif d'aide selon l'une des revendications précédentes, caractérisé en ce que ledit dispositif est configuré pour : 7. A device according to one of the preceding claims, characterized in that said device is configured to:
émettre un signal de reconnaissance en cas de détection d'un véhicule équipé d'un dispositif du même type, dit véhicule détecté, recevoir un signal d'accusé de réception dudit véhicule détecté, modifier ledit signal puisé à réception dudit accusé de réception.  transmit a recognition signal in the event of detection of a vehicle equipped with a device of the same type, said detected vehicle, receive an acknowledgment signal of said detected vehicle, modify said pulsed signal upon receipt of said acknowledgment of receipt.
8. Dispositif d'aide selon l'une des revendications précédentes, caractérisé en ce que ledit dispositif est configuré pour détecter simultanément plusieurs véhicules équipés dudit dispositif du même type et pour fonctionner en réseau avec lesdits véhicules. 8. Assist device according to one of the preceding claims, characterized in that said device is configured to simultaneously detect several vehicles equipped with said device of the same type and to network with said vehicles.
Procédé d'aide à la conduite d'un véhicule automobile (20), le véhicule (20) étant équipé d'au moins un dispositif d'éclairage (22) apte à émettre un faisceau d'éclairage d'une scène de route (SR) en avant du véhicule, et d'un écran à transmission variable (26 ; 28 ; F), destiné à être disposé entre la scène de route (SR) et un conducteur (24) du véhicule, ledit procédé comprenant une étape de pilotage en relation l'un avec l'autre d'un allumage d'au moins une source lumineuse du dispositif d'éclairage (22) et d'un coefficient de transmission de l'écran à transmission variable (26 ; 28 ; F), par un signal puisé, caractérisé en ce que le procédé contient une étape de détection d'un véhicule mettant en œuvre un procédé du même type, par communication inter véhicules, et une étape de modification dudit signal puisé de sorte à éviter des phénomènes d'antiphasage et/ou de phasage lorsqu'un tel véhicule est détecté. Method for assisting the driving of a motor vehicle (20), the vehicle (20) being equipped with at least one lighting device (22) able to emit a lighting beam of a road scene ( SR) in front of the vehicle, and a variable transmission screen (26; 28; F), to be disposed between the road scene (SR) and a driver (24) of the vehicle, said method comprising a step of driving in relation to each other an ignition of at least one light source of the lighting device (22) and a transmission coefficient of the variable transmission screen (26; 28; F) by a pulsed signal, characterized in that the method contains a step of detecting a vehicle implementing a method of the same type, by inter-vehicle communication, and a step of modifying said pulsed signal so as to avoid phenomena of antiphasage and / or phasing when such a vehicle is detected.
10. Procédé d'aide selon la revendication 9, caractérisé en ce que ladite étape de détection du croisement d'un véhicule comprend une étape de détection de la fréquence et du phasage du faisceau d'éclairage dudit véhicule croisé. 10. Assist method according to claim 9, characterized in that said step of detecting the crossing of a vehicle comprises a step of detecting the frequency and the phasing of the illumination beam of said crossed vehicle.
11. Procédé d'aide selon l'une des revendications 9 ou 10, caractérisé en ce que ladite étape de modification comprend une étape de déphasage dudit signal puisé. 12. Procédé d'aide selon la revendication 11, caractérisé en ce que la valeur de déphasage (Phi) est choisie de façon pseudo-aléatoire. 11. Assist method according to one of claims 9 or 10, characterized in that said modifying step comprises a step of phase shift of said pulsed signal. 12. Assist method according to claim 11, characterized in that the phase shift value (Phi) is chosen pseudo-randomly.
13. Procédé d'aide selon l'une des revendications 9 à 10, caractérisé en ce que l'étape de pilotage du coefficient de transmission maximise ledit coefficient de transmission de sorte que l'écran soit transparent, lors du croisement du véhicule mettant en œuvre le procédé du même type. 13. A method according to one of claims 9 to 10, characterized in that the step of controlling the transmission coefficient maximizes said transmission coefficient so that the screen is transparent, at the crossing of the vehicle putting in the process of the same type.
14. Procédé d'aide selon l'une des revendications 9 à 13, caractérisé en ce qu'il comprend les étapes : 14. Assist method according to one of claims 9 to 13, characterized in that it comprises the steps:
- d'émission d'un signal de reconnaissance en cas de détection d'un véhicule mettant en œuvre un procédé du même type, dit véhicule détecté,  emission of a recognition signal in the event of detection of a vehicle implementing a method of the same type, said detected vehicle,
de réception d'un signal d'accusé de réception dudit véhicule détecté, ladite étape de modification du signal puisé ayant lieu à réception dudit accusé de réception.  receiving an acknowledgment signal from said detected vehicle, said step of modifying the pulsed signal taking place upon receipt of said acknowledgment.
15. Procédé d'aide selon l'une des revendications 9 à 14 , caractérisé en ce que qu'il comprend une étape de détection simultanée de plusieurs véhicules équipés mettant en œuvre ledit procédé et une étape de fonctionnement en réseau avec lesdits véhicules. 15. Assist method according to one of claims 9 to 14, characterized in that it comprises a step of simultaneous detection of several equipped vehicles implementing said method and a step of network operation with said vehicles.
EP14777070.5A 2013-09-26 2014-09-26 Driving assistance method and device Withdrawn EP3049282A2 (en)

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FR1359267A FR3010938B1 (en) 2013-09-26 2013-09-26 DEVICE AND METHOD FOR DRIVING ASSISTANCE
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US20170001553A1 (en) 2017-01-05
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WO2015044349A3 (en) 2015-12-30
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FR3010938B1 (en) 2015-10-30
WO2015044349A2 (en) 2015-04-02

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