WO2020212672A1 - Lighting module and motor vehicle lighting and/or signalling device comprising such a module - Google Patents

Lighting module and motor vehicle lighting and/or signalling device comprising such a module Download PDF

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Publication number
WO2020212672A1
WO2020212672A1 PCT/FR2020/050553 FR2020050553W WO2020212672A1 WO 2020212672 A1 WO2020212672 A1 WO 2020212672A1 FR 2020050553 W FR2020050553 W FR 2020050553W WO 2020212672 A1 WO2020212672 A1 WO 2020212672A1
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WO
WIPO (PCT)
Prior art keywords
module
mod
ddl
light
lighting
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PCT/FR2020/050553
Other languages
French (fr)
Inventor
Whilk Marcelino GONCALVES
Mathieu Collot
Christophe Le Dall
Valerie Molto
Guillaume Royer
Original Assignee
Psa Automobiles Sa
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Application filed by Psa Automobiles Sa filed Critical Psa Automobiles Sa
Publication of WO2020212672A1 publication Critical patent/WO2020212672A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • 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
    • B60Q1/0017—Devices integrating an element dedicated to another function
    • B60Q1/0023—Devices integrating an element dedicated to another function the element being a sensor, e.g. distance sensor, camera
    • 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
    • B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/50—Waterproofing

Definitions

  • Lighting module and motor vehicle lighting and / or signaling device comprising such a module
  • the invention relates to lighting and / or signaling devices, intended more particularly for motor vehicles.
  • the invention relates more specifically to a lighting and / or light signaling device, without protective glass, comprising means for detecting agents for concealing said device.
  • the lighting and / or light signaling devices are arranged at the front and at the rear of a motor vehicle in order, on the one hand, to illuminate the road to improve the visibility of the driver of the vehicle. vehicle, especially in night conditions, and, on the other hand, to signal the position of the vehicle to other road users.
  • a front lighting and / or light signaling device mainly comprises the position lights, dipped beams and main beams, the different light intensities of which make it possible to adapt the lighting to external conditions.
  • a front lighting and / or light signaling device comprises a plurality of light sources which can be actuated in order to activate the various lights.
  • the different light sources are in the form of a plurality of incandescent halogen bulbs or light-emitting diodes, also referred to as LED or LED for Light-Emitting Diode in English, mounted inside a housing, the front face of which is sealed by a transparent wall, made from a transparent and impact-resistant resin in order to allow the light emitted by the light sources to be directed towards the front of the vehicle.
  • a front face also referred to under the term of “window” has the function of protecting the light sources from external conditions, in particular from rain, snow, ice or any object thrown towards the front of the vehicle and which could damage it. said light sources.
  • a lighting and / or light signaling device which does not include a window.
  • a lighting and / or light-signaling device comprises a plurality of lighting modules, the projection lens of which also acts as a protective glass.
  • lighting modules or “module” alone will be used hereinafter to designate modules which may also contain light sources capable of producing signal lights and / or lighting lights.
  • the lighting modules In a car headlight without an external protective glass, the lighting modules (dipped beam, high beam, etc.) are exposed to external weather (rain, snow, ice). Snow, in particular that accumulated during the taxiing stages, may block the light output of the lighting and signaling modules. This phenomenon may not be detected by the driver (or be detected late), which would expose him to serious risk of accidents.
  • the term "occulting agents” will denote any material or object capable of accumulating on the output lenses of the modules, making light output difficult or even impossible. In short, any configuration resulting in visibility that does not allow the driver to drive in nominal safety conditions.
  • FIG. 1 schematically illustrates in a vertical section, a projector module without protective glass as described in document FR3015003A.
  • a projector PRO typically comprises at least one lighting module MOD disposed inside a cavity CAV formed in the front face FAV of the vehicle VFIL.
  • the MOD module comprises a BOI housing and an aspherical LAS output lens hermetically sealing the BOI housing The output lens is directly exposed to snow or ice (symbolized by a cloud) NEG which can accumulate during taxiing, in the OUV opening of the CAV cavity, on or in front of the LAS exit lens.
  • a RAD heat sink (radiator) attached to the bottom of the BOI box of the MOD module, dissipates the heat given off by the light source (LED), not shown, placed inside the BOI box of the MOD module.
  • Systems are also known for detecting accumulations of snow or ice on the transparent covers of public lighting furniture or traffic lights. Such systems detect the amount of snow or ice settling on the cache and beyond a certain value activate a heating system to melt the snow or ice.
  • the detection uses an infrared or ultrasonic transmitter / receiver system.
  • the object of the present invention is to propose a solution that is simple to implement and adapted to the particular context of modules implemented in a headlight without protective glass and without aesthetic, aerodynamic or impact impact in terms of optical performance.
  • the present invention relates to a lighting module for a motor vehicle comprising a box containing a light source mounted on a support plate, a reflector capable of reflecting the light beam emitted by the light source towards a lens of light. outlet sealingly closing the opening of the case, characterized in that it further comprises a light detection device arranged on the support plate, between the light source and the outlet lens, capable of detecting a fraction of the beam light backscattered inside the housing of the module when the beam encounters a layer of an external occlusion agent accumulated on, or in the immediate vicinity of, the exit lens.
  • the detection of the light beam fraction uses the optical principle known as Lambertian scattering, with an albedo proportional to the thickness of the layer.
  • the detection device is a photo-detector, the sensitive face of which is oriented towards the internal face of the exit lens.
  • the photo-detector is provided with a focusing microlens placed in front of the sensitive face of the photo-detector.
  • a side cover or cap is arranged between the light source and the detection device to avoid parasitic illuminations coming directly from the light source or from reflecting surfaces present inside the module.
  • Another object of the invention is a motor vehicle lighting and / or signaling device, characterized in that it comprises at least one module as described above.
  • a further object of the invention is a motor vehicle comprising at least one lighting and / or signaling device as described above, characterized in that it comprises an electronic measuring and control device capable of triggering a warning signal intended for the driver of the vehicle when the signal delivered by the light detection device reaches a determined maximum threshold.
  • the determined threshold is obtained after a pre-calibration process.
  • the detection signal is processed in pulsed mode, at the same operating frequency as that of the detection device in order to filter out external noise and interference.
  • FIG. 1 Figure 1, already described, schematically illustrates, in vertical section, a projector module without protective glass of the state of the art
  • FIG. 2 illustrates optical paths of the light beam of the module of FIG. 1 in normal condition of visibility, without a layer of snow or ice;
  • Figure 3 illustrates a module of a device according to the invention, in which is disposed a light detection device which reacts to the light scattered by the layer of snow or ice;
  • Figure 4 illustrates by a block diagram the different steps of the signal processing method delivered by the light detection device of the device module according to the invention.
  • Figure 2 schematically illustrates the same MOD module as that illustrated in Figure 1 showing the optical paths of two extreme rays R1 and R2 of the luminous flux emitted by an LED, SDL, in a configuration in which no occultation agent is present on, or in the immediate vicinity of, the LAS output lens of the MOD module.
  • the LED, SDL is mounted on a SUP support plate of the PCB type (abbreviation for Printed Circuit Board: printed circuit board), which also supports a REF reflector capable of reflecting the light emitted by the LED, SDL, towards the exit lens closing the opening of the BOI box of the MOD module.
  • PCB abbreviation for Printed Circuit Board: printed circuit board
  • the luminous flux generated by the LED, SDL, is refracted by the LAS output lens outside the MOD module.
  • the majority of the light flux passes through the LAS exit lens, with a low rate of glass reflection back into the MOD module.
  • Figure 3 illustrates the same MOD module in a configuration in which the LAS exit lens is covered with a layer of NEG snow or ice.
  • a fraction of the luminous flux is then backscattered towards the interior of the MOD module according to the optical principle known as Lambertian diffusion, with an albedo proportional to the thickness of the layer of snow or ice NEG accumulated on the LAS exit lens.
  • CDF diffusion cones generated by the layer of NEG snow or ice deposited on the outer surface of the LAS exit lens behave like Lambertian diffusers.
  • the diffusion process is similar to that which takes place inside an "integrating sphere", painted on the inside with matte white paint.
  • the present invention advantageously exploits this optical property by likening the aspherical surface of the LAS output lens to an integrating sphere, or portion of a sphere, and the diffusing properties of the layer of snow or ice NEG are similar to white paint.
  • a light detection device or DDL photo-detector which reacts to the light backscattered by the layer of snow or ice NEG, is disposed between the LED, SDL, and the output lens LAS. It shares the same SUP support as that of the LED and therefore the same printed circuit.
  • the signal delivered by the DDL photo-detector is routed via the printed circuit, to an electronic measuring and control device DMC (to be shown in the figure) of the VHL vehicle which, according to a predetermined calibration threshold, triggers a warning sign for the driver of the VHL vehicle via a suitable HMI (Human Machine Interface).
  • DMC Human Machine Interface
  • the latter must then stop his VHL vehicle and clear the layer of NEG snow or ice to be able to resume the road in nominal safety conditions.
  • the sensitive face of the DDL photodetector is oriented towards the internal face of the LAS output lens and the DDL photodetector may be provided with a focusing microlens disposed in front of the sensitive face, not shown.
  • the detection signal is processed in pulsed mode, at the same operating frequency as the LED, SDL, of the MOD lighting module, in order to filter out external noise and interference.
  • a side cover or cap is disposed between the LED, SDL, and the DDL photo-detector to avoid parasitic illuminations directly from the LED, SDL, or other reflective surfaces present inside the module.
  • FIG. 4 illustrates by a block diagram the various steps of the method for processing the signal delivered by the photo-detector as implemented by the measuring and control device DMC.
  • the process requires a pre-calibration operation to establish the maximum reference threshold for triggering the fault report to the attention of the driver.
  • This threshold is determined according to the desired level of transmission through the LAS output lens of the MOD lighting module meeting current regulations.
  • the DDL photo-detector works at a reference frequency which, as already described, preferably corresponds to the excitation frequency of the LED, SDL.
  • the signal delivered by the DDL photo detector is then amplified and filtered before being compared to the calibration threshold.
  • the present invention makes it possible to resolve a sticking point with a solution that is simple to integrate and at low cost: addition of a photo-detector (commercial component) and a few lines of code.

Abstract

Motor vehicle lighting module (MOD) comprising a housing (BOI) containing a light source (SDL) mounted on a support plate (SUP), a reflector (REF) able to reflect the beam of light emitted by the light source (SDL) toward an exit lens (LAS) sealing the opening of the housing (BOI) closed, characterized in that it further comprises a light detection device (DDL) arranged on the support plate (SUP), between the light source (DDL) and the exit lens (LAS), able to detect a fraction of the beam of light back-scattered inside the housing (BOI) of the module (MOD) when the beam encounters a layer of an external light-occulting agent (NEG) that has accumulated on, or in the immediate vicinity of, the exit lens (LAS)

Description

Titre de l’invention : Title of the invention:
Module d’éclairage et dispositif d’éclairage et/ou de signalisation de véhicule automobile comportant un tel module Lighting module and motor vehicle lighting and / or signaling device comprising such a module
L'invention concerne les dispositifs d’éclairage et/ou de signalisation, destinés plus particulièrement aux véhicules automobiles. L’invention porte plus précisément sur un dispositif d’éclairage et/ou de signalisation lumineuse, sans vitre de protection, comprenant des moyens de détection d’agents d’occultation dudit dispositif. The invention relates to lighting and / or signaling devices, intended more particularly for motor vehicles. The invention relates more specifically to a lighting and / or light signaling device, without protective glass, comprising means for detecting agents for concealing said device.
De manière connue, les dispositifs d’éclairage et/ou de signalisation lumineuse sont disposés à l’avant et à l’arrière d’un véhicule automobile afin, d’une part, d’éclairer la route pour améliorer la visibilité du conducteur du véhicule, notamment en condition nocturne, et, d’autre part, de signaliser la position du véhicule aux autres usagers de la route. In known manner, the lighting and / or light signaling devices are arranged at the front and at the rear of a motor vehicle in order, on the one hand, to illuminate the road to improve the visibility of the driver of the vehicle. vehicle, especially in night conditions, and, on the other hand, to signal the position of the vehicle to other road users.
En pratique, un dispositif d’éclairage et/ou de signalisation lumineuse avant comprend principalement les feux de position, les feux de croisement et les feux de route dont les différentes intensités lumineuses permettent d’adapter l’éclairage aux conditions extérieures. Pour ce faire, un dispositif d’éclairage et/ou de signalisation lumineuse avant comprend une pluralité de sources lumineuses pouvant être actionnées afin d’activer les différents feux. In practice, a front lighting and / or light signaling device mainly comprises the position lights, dipped beams and main beams, the different light intensities of which make it possible to adapt the lighting to external conditions. To do this, a front lighting and / or light signaling device comprises a plurality of light sources which can be actuated in order to activate the various lights.
De manière classique, les différentes sources lumineuses se présentent sous la forme d’une pluralité d’ampoules à incandescence halogène ou de diodes électroluminescentes, également désignées DEL ou LED pour Light-Emitting Diode en langue anglaise, montées à l’intérieur d’un boîtier dont la face avant est fermée de manière étanche par une paroi transparente, réalisée à partir d’une résine transparente et résistante aux chocs afin de permettre à la lumière émise par les sources de lumières d’être orientée vers l’avant du véhicule. Une telle face avant, également désignée sous le terme de « vitre », a pour fonction de protéger les sources de lumières des conditions extérieures, notamment de la pluie, neige, glace ou de tout objet projeté vers l’avant du véhicule et pouvant endommager lesdites sources de lumière. On connaît, par le document FR3015003A, un dispositif d’éclairage et/ou de signalisation lumineuse ne comprenant pas de vitre. Un tel dispositif d’éclairage et/ou de signalisation lumineuse comprend une pluralité de modules d’éclairage dont la lentille de projection fait également office de vitre de protection. Conventionally, the different light sources are in the form of a plurality of incandescent halogen bulbs or light-emitting diodes, also referred to as LED or LED for Light-Emitting Diode in English, mounted inside a housing, the front face of which is sealed by a transparent wall, made from a transparent and impact-resistant resin in order to allow the light emitted by the light sources to be directed towards the front of the vehicle. Such a front face, also referred to under the term of “window”, has the function of protecting the light sources from external conditions, in particular from rain, snow, ice or any object thrown towards the front of the vehicle and which could damage it. said light sources. From document FR3015003A, a lighting and / or light signaling device is known which does not include a window. Such a lighting and / or light-signaling device comprises a plurality of lighting modules, the projection lens of which also acts as a protective glass.
Par commodité, les termes « modules d’éclairage » ou « module » seul seront utilisés par la suite pour désigner des modules qui peuvent aussi bien contenir des sources de lumière aptes à réaliser des feux de signalisation et/ou des feux d’éclairage. For convenience, the terms "lighting modules" or "module" alone will be used hereinafter to designate modules which may also contain light sources capable of producing signal lights and / or lighting lights.
Dans un projecteur automobile sans vitre extérieure de protection, les modules d’éclairage (feux de croisement, feux de route, etc.), sont exposés aux intempéries extérieures (pluie, neige, glace). La neige, en particulier celle accumulée pendant les étapes de roulage, risque de bloquer la sortie de lumière des modules d’éclairage et signalisation. Ce phénomène risque de ne pas être détecté par le conducteur (ou l’être tardivement), c’est qui l’exposerait à de graves risques d’accidents. In a car headlight without an external protective glass, the lighting modules (dipped beam, high beam, etc.) are exposed to external weather (rain, snow, ice). Snow, in particular that accumulated during the taxiing stages, may block the light output of the lighting and signaling modules. This phenomenon may not be detected by the driver (or be detected late), which would expose him to serious risk of accidents.
De manière générale, on désignera par « agents d’occultation », toute matière ou objet apte à s’accumuler sur les lentilles de sorties des modules, rendant la sortie de lumière difficile voire impossible. Bref toute configuration aboutissant à une visibilité ne permettant pas au conducteur de conduire dans des conditions de sécurité nominales. In general, the term "occulting agents" will denote any material or object capable of accumulating on the output lenses of the modules, making light output difficult or even impossible. In short, any configuration resulting in visibility that does not allow the driver to drive in nominal safety conditions.
Dans les projecteurs comportant un boîtier fermé par une vitre, on connaît différents systèmes permettant d’anticiper la tenue de la glace ou la neige sur la vitre en amenant par exemple de l’air chaud au voisinage de la vitre par l’intérieur du boîtier. On a pu connaître également des essuie vitre (balais d’essuie-vitre) pour projecteur qui nécessitaient d’avoir une surface vitrée relativement plane. In headlamps comprising a housing closed by a window, various systems are known which make it possible to anticipate the behavior of ice or snow on the window by, for example, bringing hot air to the vicinity of the window via the interior of the housing. . We have also been able to know screen wipers (wiper blades) for projectors which required having a relatively flat glass surface.
Aucune de ces solutions n’est possible avec un module d’éclairage dépourvu de vitre de protection tel que décrit dans le document FR3015003A. Neither of these solutions is possible with a lighting module without a protective glass as described in document FR3015003A.
La figure 1 illustre schématiquement suivant une section verticale, un module de projecteur sans vitre de protection tel que décrit dans le document FR3015003A. Un tel projecteur PRO comporte typiquement, au moins un module d’éclairage MOD disposé à l’intérieur d’une cavité CAV ménagée dans la face avant FAV du véhicule VFIL. Le module MOD comporte un boîtier BOI et une lentille de sortie asphérique LAS fermant hermétiquement le boîtier BOI La lentille de sortie est directement exposée à la neige ou la glace (symbolisé par un nuage) NEG qui peut s’accumuler durant le roulage, dans l’ouverture OUV de la cavité CAV, sur ou devant la lentille de sortie LAS. Un dissipateur thermique RAD (radiateur), attenant au fond du boitier BOI du module MOD, permet de dissiper la chaleur dégagée par la source de lumière (LED), non représentée, disposée à l’intérieur du boitier BOI du module MOD. FIG. 1 schematically illustrates in a vertical section, a projector module without protective glass as described in document FR3015003A. Such a projector PRO typically comprises at least one lighting module MOD disposed inside a cavity CAV formed in the front face FAV of the vehicle VFIL. The MOD module comprises a BOI housing and an aspherical LAS output lens hermetically sealing the BOI housing The output lens is directly exposed to snow or ice (symbolized by a cloud) NEG which can accumulate during taxiing, in the OUV opening of the CAV cavity, on or in front of the LAS exit lens. A RAD heat sink (radiator), attached to the bottom of the BOI box of the MOD module, dissipates the heat given off by the light source (LED), not shown, placed inside the BOI box of the MOD module.
On connaît également des systèmes pour détecter des cumuls de neige ou de glace sur les caches transparents de mobiliers d’éclairage public ou des feux de signalisation routière. De tels systèmes détectent la quantité de neige ou de glace qui se dépose sur le cache et au-delà d’une certaine valeur, active un système de chauffage pour faire fondre la neige ou la glace. La détection utilise un système émetteur/récepteur à infra-rouge ou à ultra-sons. Systems are also known for detecting accumulations of snow or ice on the transparent covers of public lighting furniture or traffic lights. Such systems detect the amount of snow or ice settling on the cache and beyond a certain value activate a heating system to melt the snow or ice. The detection uses an infrared or ultrasonic transmitter / receiver system.
Ces systèmes ne sont pas adaptés au domaine automobile avec les contraintes propres à un dispositif d’éclairage et/ou de signalisation d’un véhicule automobile en cours de roulage. Ils sont par ailleurs gourmands en énergie électrique. These systems are not suitable for the automotive sector with the constraints specific to a lighting and / or signaling device for a motor vehicle while it is moving. They are also greedy in electrical energy.
La présente invention a pour but de proposer une solution simple à mettre en œuvre adaptée au contexte particulier des modules mis en œuvre dans un projecteur sans vitre de protection et sans impact esthétique, aérodynamique ni en termes de performances optiques. The object of the present invention is to propose a solution that is simple to implement and adapted to the particular context of modules implemented in a headlight without protective glass and without aesthetic, aerodynamic or impact impact in terms of optical performance.
A cet effet, la présente invention a pour objet un module d’éclairage pour véhicule automobile comportant un boitier contenant une source de lumière montée sur une plaque support, un réflecteur apte à réfléchir le faisceau lumineux émis par la source de lumière vers une lentille de sortie fermant de manière étanche l’ouverture du boitier, caractérisé en ce qu’il comporte en outre un dispositif de détection de lumière disposé sur la plaque support, entre la source de lumière et la lentille de sortie, apte à détecter une fraction du faisceau lumineux rétrodiffusé à l’intérieur du boitier du module quand le faisceau rencontre une couche d’un agent d’occultation extérieur accumulée sur, ou à proximité immédiate de, la lentille de sortie. To this end, the present invention relates to a lighting module for a motor vehicle comprising a box containing a light source mounted on a support plate, a reflector capable of reflecting the light beam emitted by the light source towards a lens of light. outlet sealingly closing the opening of the case, characterized in that it further comprises a light detection device arranged on the support plate, between the light source and the outlet lens, capable of detecting a fraction of the beam light backscattered inside the housing of the module when the beam encounters a layer of an external occlusion agent accumulated on, or in the immediate vicinity of, the exit lens.
Selon une caractéristique, la détection de la fraction de faisceau lumineux exploite le principe optique dit de diffusion lambertienne, avec un albedo proportionnel à l’épaisseur de la couche. According to one characteristic, the detection of the light beam fraction uses the optical principle known as Lambertian scattering, with an albedo proportional to the thickness of the layer.
Selon une autre caractéristique, le dispositif de détection est un photo-détecteur dont la face sensible est orientée vers la face interne de la lentille de sortie. According to another characteristic, the detection device is a photo-detector, the sensitive face of which is oriented towards the internal face of the exit lens.
Selon une autre caractéristique, le photo-détecteur est muni d’une microlentille de focalisation disposée devant la face sensible du photo-détecteur. Selon une autre caractéristique, un cache latéral ou casquette, est disposé entre la source de lumière, et le dispositif de détection pour éviter des illuminations parasites issues directement de la source de lumière ou de surfaces réfléchissantes présentes à l’intérieur du module. According to another characteristic, the photo-detector is provided with a focusing microlens placed in front of the sensitive face of the photo-detector. According to another characteristic, a side cover or cap is arranged between the light source and the detection device to avoid parasitic illuminations coming directly from the light source or from reflecting surfaces present inside the module.
L’invention a pour autre objet un dispositif d’éclairage et/ou de signalisation de véhicule automobile, caractérisé en ce qu’il comporte au moins un module tel que décrit ci-dessus. Another object of the invention is a motor vehicle lighting and / or signaling device, characterized in that it comprises at least one module as described above.
L’invention a encore pour autre objet, un véhicule automobile comportant au moins un dispositif d’éclairage et/ou de signalisation tel que décrit ci-dessus, caractérisé en ce qu’il comporte un dispositif électronique de mesure et de commande apte à déclencher un signal d’avertissement à destination du conducteur du véhicule quand le signal délivré par le dispositif de détection de lumière atteint un seuil maximum déterminé. A further object of the invention is a motor vehicle comprising at least one lighting and / or signaling device as described above, characterized in that it comprises an electronic measuring and control device capable of triggering a warning signal intended for the driver of the vehicle when the signal delivered by the light detection device reaches a determined maximum threshold.
Selon une caractéristique, le seuil déterminé est obtenu après un processus de pré calibration. According to one characteristic, the determined threshold is obtained after a pre-calibration process.
Selon une autre caractéristique, le signal de détection est traité en mode pulsé, à la même fréquence d’opération que celui du dispositif de détection afin de filtrer les bruits et interférences extérieures. According to another characteristic, the detection signal is processed in pulsed mode, at the same operating frequency as that of the detection device in order to filter out external noise and interference.
D’autres avantages et caractéristiques pourront ressortir plus clairement de la description qui va suivre, donnée uniquement à titre d’exemple non limitatif et faite en se référant au dessin dans lequel : Other advantages and characteristics may emerge more clearly from the description which follows, given solely by way of non-limiting example and made with reference to the drawing in which:
[Fig. 1 ] La figure 1 , déjà décrite, illustre schématiquement, suivant une section verticale, un module de projecteur sans vitre de protection de l’état de l’art ; [Fig. 1] Figure 1, already described, schematically illustrates, in vertical section, a projector module without protective glass of the state of the art;
[Fig. 2] La figure 2 illustre des chemins optiques du faisceau lumineux du module de la figure 1 en condition normale de visibilité, sans couche de neige ou de glace ; [Fig. 3] La figure 3 illustre un module d’un dispositif selon l’invention, dans lequel est disposé un dispositif de détection de lumière qui réagit à la lumière diffusée par la couche de neige ou de glace ; et [Fig. 2] FIG. 2 illustrates optical paths of the light beam of the module of FIG. 1 in normal condition of visibility, without a layer of snow or ice; [Fig. 3] Figure 3 illustrates a module of a device according to the invention, in which is disposed a light detection device which reacts to the light scattered by the layer of snow or ice; and
[Fig. 4] La figure 4 illustre par un bloc-diagramme les différentes étapes du procédé de traitement du signal délivré par le dispositif de détection de lumière du module du dispositif selon l’invention. [Fig. 4] Figure 4 illustrates by a block diagram the different steps of the signal processing method delivered by the light detection device of the device module according to the invention.
Sur les figures, les mêmes éléments sont désignés par les même références. In the figures, the same elements are designated by the same references.
La figure 2 illustre schématiquement le même module MOD que celui illustré à la figure 1 mettant en évidence les chemins optiques de deux rayons extrêmes R1 et R2 du flux lumineux émis par une LED, SDL, dans une configuration dans laquelle aucun agent d’occultation n’est présent sur, ou à proximité immédiate de, la lentille de sortie LAS du module MOD. Figure 2 schematically illustrates the same MOD module as that illustrated in Figure 1 showing the optical paths of two extreme rays R1 and R2 of the luminous flux emitted by an LED, SDL, in a configuration in which no occultation agent is present on, or in the immediate vicinity of, the LAS output lens of the MOD module.
La LED, SDL, est montée sur une plaque support SUP de type PCB (abréviation anglo-saxonne pour Printed Circuit Board : plaque de circuit imprimé), qui supporte également un réflecteur REF apte à réfléchir la lumière émise par la LED, SDL, vers la lentille de sortie fermant l’ouverture du boîtier BOI du module MOD. The LED, SDL, is mounted on a SUP support plate of the PCB type (abbreviation for Printed Circuit Board: printed circuit board), which also supports a REF reflector capable of reflecting the light emitted by the LED, SDL, towards the exit lens closing the opening of the BOI box of the MOD module.
Le flux lumineux généré par la LED, SDL, est réfracté par la lentille de sortie LAS à l’extérieur du module MOD. The luminous flux generated by the LED, SDL, is refracted by the LAS output lens outside the MOD module.
La majorité du flux lumineux traverse la lentille de sortie LAS, avec un faible taux de réflexion vitreuse de retour vers l’intérieur du module MOD. The majority of the light flux passes through the LAS exit lens, with a low rate of glass reflection back into the MOD module.
La figure 3 illustre le même module MOD dans une configuration dans laquelle la lentille de sortie LAS est recouverte d’une couche de neige ou de glace NEG. Figure 3 illustrates the same MOD module in a configuration in which the LAS exit lens is covered with a layer of NEG snow or ice.
Une fraction du flux lumineux est alors rétrodiffusée vers l’intérieur du module MOD selon le principe optique dit de diffusion lambertienne, avec un albedo proportionnel à l’épaisseur de la couche de neige ou de glace NEG accumulée sur la lentille de sortie LAS. A fraction of the luminous flux is then backscattered towards the interior of the MOD module according to the optical principle known as Lambertian diffusion, with an albedo proportional to the thickness of the layer of snow or ice NEG accumulated on the LAS exit lens.
Des cônes de diffusion CDF engendrés par la couche de neige ou de glace NEG déposée sur la surface extérieure de la lentille de sortie LAS, se comportent comme des diffuseurs lambertiens. CDF diffusion cones generated by the layer of NEG snow or ice deposited on the outer surface of the LAS exit lens, behave like Lambertian diffusers.
Le processus de diffusion est similaire à celui qui a lieu à l’intérieur d’une « sphère intégrante », peinte à l’intérieure avec de la peinture blanche matte. The diffusion process is similar to that which takes place inside an "integrating sphere", painted on the inside with matte white paint.
La présente invention exploite avantageusement cette propriété optique en assimilant la surface asphérique de la lentille de sortie LAS à une sphère, ou portion de sphère, intégrante et les propriétés diffusantes de la couche de neige ou de glace NEG sont similaires à la peinture blanche. The present invention advantageously exploits this optical property by likening the aspherical surface of the LAS output lens to an integrating sphere, or portion of a sphere, and the diffusing properties of the layer of snow or ice NEG are similar to white paint.
Selon l’invention, un dispositif de détection de lumière ou photo-détecteur DDL qui réagit à la lumière rétrodiffusée par la couche de neige ou de glace NEG, est disposé entre la LED, SDL, et la lentille de sortie LAS. Il partage le même support SUP que celui de la LED et donc le même circuit imprimé. According to the invention, a light detection device or DDL photo-detector which reacts to the light backscattered by the layer of snow or ice NEG, is disposed between the LED, SDL, and the output lens LAS. It shares the same SUP support as that of the LED and therefore the same printed circuit.
Le signal délivré par le photo-détecteur DDL est acheminé via le circuit imprimé, à un dispositif électronique de mesure et de commande DMC (à représenter sur la figure) du véhicule VHL qui, en fonction d’un seuil de calibration prédéterminé, déclenche un signal d’avertissement à l’attention du conducteur du véhicule VHL via une IHM (Interface Homme Machine) adaptée. Ce dernier devra alors arrêter son véhicule VHL et dégager la couche de neige ou de glace NEG pour pouvoir reprendre la route dans des conditions de sécurité nominales. The signal delivered by the DDL photo-detector is routed via the printed circuit, to an electronic measuring and control device DMC (to be shown in the figure) of the VHL vehicle which, according to a predetermined calibration threshold, triggers a warning sign for the driver of the VHL vehicle via a suitable HMI (Human Machine Interface). The latter must then stop his VHL vehicle and clear the layer of NEG snow or ice to be able to resume the road in nominal safety conditions.
Afin d’optimiser l’efficacité de la détection, plusieurs aménagements parmi les suivants peuvent être envisagées séparément ou en combinaison. In order to optimize detection efficiency, several of the following arrangements can be considered separately or in combination.
La face sensible du photo-détecteur DDL est orientée vers la face interne de la lentille de sortie LAS et le photo-détecteur DDL peut être muni d’une microlentille de focalisation disposée devant la face sensible, non représentée. The sensitive face of the DDL photodetector is oriented towards the internal face of the LAS output lens and the DDL photodetector may be provided with a focusing microlens disposed in front of the sensitive face, not shown.
Le signal de détection est traité en mode pulsé, à la même fréquence d’opération que la LED, SDL, du module d’éclairage MOD, afin de filtrer les bruits et interférences extérieures. The detection signal is processed in pulsed mode, at the same operating frequency as the LED, SDL, of the MOD lighting module, in order to filter out external noise and interference.
Un cache latéral ou casquette, non représenté, est disposé entre la LED, SDL, et le photo-détecteur DDL pour éviter des illuminations parasites issues directement de la LED, SDL, ou d’autres surfaces réfléchissantes présentes à l’intérieur du module. A side cover or cap, not shown, is disposed between the LED, SDL, and the DDL photo-detector to avoid parasitic illuminations directly from the LED, SDL, or other reflective surfaces present inside the module.
La figure 4 illustre par un bloc-diagramme les différentes étapes du procédé de traitement du signal délivré par le photo-détecteur tel que mis en œuvre par le dispositif de mesure et de commande DMC. FIG. 4 illustrates by a block diagram the various steps of the method for processing the signal delivered by the photo-detector as implemented by the measuring and control device DMC.
Tout d’abord, le procédé nécessite une opération de pré-calibration pour établir le seuil maximum de référence pour le déclenchement de la remontée de défaillance à l’attention du conducteur. Ce seuil est déterminé en fonction du niveau souhaité de transmission à travers la lentille de sortie LAS du module d’éclairage MOD répondant à la réglementation en vigueur. First, the process requires a pre-calibration operation to establish the maximum reference threshold for triggering the fault report to the attention of the driver. This threshold is determined according to the desired level of transmission through the LAS output lens of the MOD lighting module meeting current regulations.
Le photo-détecteur DDL travaille à une fréquence de référence qui comme déjà décrit correspond de préférence à la fréquence d’excitation de la LED, SDL. The DDL photo-detector works at a reference frequency which, as already described, preferably corresponds to the excitation frequency of the LED, SDL.
Le signal délivré par le photo détecteur DDL est ensuite amplifié et filtré avant d’être comparé au seuil de calibration. The signal delivered by the DDL photo detector is then amplified and filtered before being compared to the calibration threshold.
Si le seuil maximum est atteint alors un signal d’avertissement est remonté à l’attention du conducteur. If the maximum threshold is reached then a warning signal is raised to the attention of the driver.
Si le seuil maximum n’est pas atteint, alors le processus est réitéré à la fréquence de référence. If the maximum threshold is not reached, then the process is repeated at the reference frequency.
La présente invention permet de résoudre un point de blocage avec une solution simple à intégrer et à bas coût : rajout d’un photo-détecteur (composant du commerce) et quelques lignes de code. The present invention makes it possible to resolve a sticking point with a solution that is simple to integrate and at low cost: addition of a photo-detector (commercial component) and a few lines of code.

Claims

REVENDICATIONS
1. Module d’éclairage (MOD) pour véhicule automobile (VHL) comportant un boîtier (BOI) contenant une source de lumière (SDL) montée sur une plaque support (SUP), un réflecteur (REF) apte à réfléchir le faisceau lumineux émis par la source de lumière (SDL) vers une lentille de sortie (LAS) fermant de manière étanche l’ouverture du boîtier (BOI), caractérisé en ce qu’il comporte en outre un dispositif de détection de lumière (DDL) disposé sur la plaque support (SUP), entre la source de lumière (DDL) et la lentille de sortie (LAS), apte à détecter une fraction du faisceau lumineux rétrodiffusé à l’intérieur du boîtier (BOI) du module (MOD) quand le faisceau rencontre une couche d’un agent d’occultation extérieur (NEG) accumulée sur, ou à proximité immédiate de, la lentille de sortie (LAS). 1. Lighting module (MOD) for a motor vehicle (VHL) comprising a box (BOI) containing a light source (SDL) mounted on a support plate (SUP), a reflector (REF) capable of reflecting the emitted light beam by the light source (SDL) to an exit lens (LAS) sealingly closing the opening of the housing (BOI), characterized in that it further comprises a light detection device (DDL) arranged on the support plate (SUP), between the light source (DDL) and the exit lens (LAS), able to detect a fraction of the light beam backscattered inside the housing (BOI) of the module (MOD) when the beam encounters a layer of an exterior blocking agent (NEG) accumulated on, or in close proximity to, the exit lens (LAS).
2. Module (MOD) selon la revendication précédente, caractérisé en ce que la détection de la fraction de faisceau lumineux exploite le principe optique dit de diffusion lambertienne, avec un albedo proportionnel à l’épaisseur de la couche (NEG). 2. Module (MOD) according to the preceding claim, characterized in that the detection of the light beam fraction uses the optical principle known as Lambertian scattering, with an albedo proportional to the thickness of the layer (NEG).
3. Module (MOD) selon l’une des revendications précédentes, caractérisé en ce que le dispositif de détection (DDL) est un photo-détecteur dont la face sensible est orientée vers la face interne de la lentille de sortie (LAS). 3. Module (MOD) according to one of the preceding claims, characterized in that the detection device (DDL) is a photo-detector, the sensitive face of which is oriented towards the internal face of the output lens (LAS).
4. Module (MOD) selon la revendication précédente, caractérisé en ce que le photo-détecteur (DDL) est muni d’une microlentille de focalisation disposée devant la face sensible du photo-détecteur (DDL). 4. Module (MOD) according to the preceding claim, characterized in that the photo-detector (DDL) is provided with a focusing microlens disposed in front of the sensitive face of the photo-detector (DDL).
5. Module (MOD) selon l’une des revendications précédentes, caractérisé en ce qu’un cache latéral ou casquette, est disposé entre la source de lumière (SDL), et le dispositif de détection (DDL) pour éviter des illuminations parasites issues directement de la source de lumière (SDL) ou de surfaces réfléchissantes présentes à l’intérieur du module (MOD). 5. Module (MOD) according to one of the preceding claims, characterized in that a side cover or cap is arranged between the light source (SDL), and the detection device (DDL) to avoid parasitic illuminations from directly from the light source (SDL) or from reflective surfaces present inside the module (MOD).
6. Dispositif d’éclairage et/ou de signalisation de véhicule automobile (VHL), caractérisé en ce qu’il comporte au moins un module (MOD) selon l’une des revendications précédentes. 6. Motor vehicle lighting and / or signaling device (VHL), characterized in that it comprises at least one module (MOD) according to one of the preceding claims.
7. Véhicule automobile (VHL) comportant au moins un dispositif d’éclairage et/ou de signalisation selon la revendication précédente, caractérisé en ce qu’il comporte un dispositif électronique de mesure et de commande (DMC) apte à déclencher un signal d’avertissement à destination du conducteur du véhicule (VHL) quand le signal délivré par le dispositif de détection de lumière (DDL) atteint un seuil maximum déterminé. 7. Motor vehicle (VHL) comprising at least one lighting and / or signaling device according to the preceding claim, characterized in that it comprises an electronic measuring and control device (DMC) capable of triggering a signal of. warning to the driver of the vehicle (VHL) when the signal delivered by the light detection device (DDL) reaches a determined maximum threshold.
8. Véhicule (VHL) selon la revendication précédente, caractérisé en ce le seuil déterminé est obtenu après un processus de pré-calibration. 8. Vehicle (VHL) according to the preceding claim, characterized in that the determined threshold is obtained after a pre-calibration process.
9. Véhicule (VHL) selon l’une des revendications 7 ou 8, caractérisé en ce que le signal de détection est traité en mode pulsé, à la même fréquence d’opération que celui du dispositif de détection (DDL) afin de filtrer les bruits et interférences extérieures. 9. Vehicle (VHL) according to one of claims 7 or 8, characterized in that the detection signal is processed in pulsed mode, at the same operating frequency as that of the detection device (DDL) in order to filter the outside noise and interference.
PCT/FR2020/050553 2019-04-17 2020-03-16 Lighting module and motor vehicle lighting and/or signalling device comprising such a module WO2020212672A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10000291A1 (en) * 2000-01-07 2001-07-12 Hella Kg Hueck & Co Vehicle headlamp light detector detects light reflected by dirt on outside of headlamp cover with filter element in front of detector to pass light wavelengths emitted by headlamp
DE10044593A1 (en) * 2000-08-12 2002-02-21 Porsche Ag Device for optical detection of fouling on light cover panel has regulator that outputs signal if the integral signal from receiver on panel edge has exceeded predefined threshold value
DE102011008556A1 (en) * 2011-01-14 2012-07-19 Daimler Ag Illumination device for vehicle, has sensor arrangement that is provided for determining contamination of housing component based on change in light signal reflected by housing component
DE102013005289A1 (en) * 2013-03-27 2014-10-02 Daimler Ag Lighting device for a vehicle and method for monitoring a lighting device
DE102013108911A1 (en) * 2013-08-19 2015-02-19 Hella Kgaa Hueck & Co. Lighting device for a vehicle with a dirt sensor
FR3015003A1 (en) 2013-12-13 2015-06-19 Peugeot Citroen Automobiles Sa MOTOR VEHICLE PROJECTOR WITHOUT ICE

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10000291A1 (en) * 2000-01-07 2001-07-12 Hella Kg Hueck & Co Vehicle headlamp light detector detects light reflected by dirt on outside of headlamp cover with filter element in front of detector to pass light wavelengths emitted by headlamp
DE10044593A1 (en) * 2000-08-12 2002-02-21 Porsche Ag Device for optical detection of fouling on light cover panel has regulator that outputs signal if the integral signal from receiver on panel edge has exceeded predefined threshold value
DE102011008556A1 (en) * 2011-01-14 2012-07-19 Daimler Ag Illumination device for vehicle, has sensor arrangement that is provided for determining contamination of housing component based on change in light signal reflected by housing component
DE102013005289A1 (en) * 2013-03-27 2014-10-02 Daimler Ag Lighting device for a vehicle and method for monitoring a lighting device
DE102013108911A1 (en) * 2013-08-19 2015-02-19 Hella Kgaa Hueck & Co. Lighting device for a vehicle with a dirt sensor
FR3015003A1 (en) 2013-12-13 2015-06-19 Peugeot Citroen Automobiles Sa MOTOR VEHICLE PROJECTOR WITHOUT ICE

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FR3095173B1 (en) 2023-03-10

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