EP3427109A1 - Optical detection system for motor vehicle - Google Patents

Optical detection system for motor vehicle

Info

Publication number
EP3427109A1
EP3427109A1 EP17708556.0A EP17708556A EP3427109A1 EP 3427109 A1 EP3427109 A1 EP 3427109A1 EP 17708556 A EP17708556 A EP 17708556A EP 3427109 A1 EP3427109 A1 EP 3427109A1
Authority
EP
European Patent Office
Prior art keywords
detection system
optical detection
optical
grid
optical sensor
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Withdrawn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
EP17708556.0A
Other languages
German (de)
French (fr)
Inventor
Giuseppe Grasso
Grégory KOLANOWSKI
Marcel Trebouet
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 Systemes dEssuyage SAS
Original Assignee
Valeo Systemes dEssuyage 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 Systemes dEssuyage SAS filed Critical Valeo Systemes dEssuyage SAS
Publication of EP3427109A1 publication Critical patent/EP3427109A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation
    • H04N23/811—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation by dust removal, e.g. from surfaces of the image sensor or processing of the image signal output by the electronic image sensor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/56—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/04—Mounting of cameras operative during drive; Arrangement of controls thereof relative to the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/46—Cleaning windscreens, windows or optical devices using liquid; Windscreen washers
    • B60S1/48—Liquid supply therefor
    • B60S1/52—Arrangement of nozzles; Liquid spreading means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/54—Cleaning windscreens, windows or optical devices using gas, e.g. hot air
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/08—Waterproof bodies or housings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/51—Housings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/56—Accessories

Definitions

  • the present invention relates to an optical detection system for a motor vehicle.
  • An optical detection system is any system comprising optical sensors, such as cameras, laser sensors (commonly called LIDARS) or other sensors based on the emission and / or detection of light in the visible or invisible spectrum for humans , especially the infrared.
  • optical sensors such as cameras, laser sensors (commonly called LIDARS) or other sensors based on the emission and / or detection of light in the visible or invisible spectrum for humans , especially the infrared.
  • Cameras are known which are installed inside the cockpit against the rear window / bezel looking towards the rear from the rear window of the vehicle. These cameras are well protected from external climatic influences and can for example benefit from the defrosting and cleaning systems of the rear window, for example a heating wire integrated in the glass of the rear window.
  • the angle of view is not optimal, especially for a parking aid and for this reason, it is preferred that the camera is arranged at the rear bumper or at the rear registration plate of the vehicle. .
  • the camera is highly exposed to the projections of dirt that can be deposited on its optics and thus reduce its effectiveness, or even make it inoperative.
  • a device for cleaning the optics of the camera usually a nozzle of cleaning fluid, close to it, to remove the polluting elements that are deposited over time.
  • frost may settle on the optics of the camera, making it inoperative.
  • a known state of the art is for example represented by the document FR2841488 in the name of the Applicant in which a nozzle projects for example a washing liquid under pressure on a protective glass of the camera.
  • the jet is also assisted by means of vibration to remove stubborn dirt from the protective glass of the camera, glass that can be heated to protect against the deposition of frost in cold weather.
  • this vision system can be optimized. Indeed, after the projection of a washing liquid on the optics of the camera, there may remain drops attached to the protective glass, which damages and deforms the image taken by the camera. The presence of the washing liquid drops results from the fact that the washing liquid does not slip easily on the surface of the optics of the camera. In addition, the evaporation of the drops on the protective glass leaves traces that can be seen on the image taken by the camera.
  • the present invention proposes to remedy at least partially one or more of the aforementioned disadvantages by presenting an alternative optical detection system for preventing the deposit of dirt on the camera.
  • the subject of the invention is an optical detection system of a motor vehicle comprising:
  • a gate disposed on the optical axis of the optical sensor in the field of view thereof and perpendicular to this optical axis, and on the other hand a generator of a flow of air towards the grid.
  • micro-turbulence is created downstream of the grid which prevents water, dust or more generally dirt from crossing the gate in the direction of the camera and being deposited on the screen. camera lens.
  • the grid has meshes of parallelepipedal shape, in particular of square shape.
  • the length of a side of a mesh is for example between 0.5mm and 2.5mm, in particular equal to 2mm.
  • the grid is formed of wires having a diameter less than
  • 0.05mm in particular between 0.02mm and 0.04mm.
  • the grid may be formed of stainless steel wire or plastic material, in particular composite material.
  • the grid comprises resistive son able to heat up by Joule effect and is configured to be connected to a power source for heating the grid.
  • the protective housing has a cylindrical shape and the grid has a disk shape closing one end of the ends of the protective housing.
  • the protective housing has a cylindrical shape and the gate has a shape adapted to cover the viewing angles of the optical sensor.
  • the air flow surrounds the optical sensor.
  • the airflow generator is integrated in the protective housing.
  • the airflow generator comprises for example an air blower disposed behind the protective housing.
  • the airflow generator comprises a compressor located outside the protective housing.
  • the optical detection system may further comprise at least one nozzle for spraying a washing liquid on the face of the grid facing the optical sensor.
  • the optical detection system comprises a plurality of spray nozzles of a washing liquid evenly distributed around the optical sensor and projecting inside the protective case.
  • FIG. 1 shows in a longitudinal sectional view a simplified diagram of an embodiment of an optical detection system. presenting in detail a grid in front view.
  • the following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments may also be combined or interchanged to provide other embodiments.
  • a first element is disposed upstream of a second element if the fluid first passes through the first element and then through the second element.
  • FIG. 1 shows an embodiment of an optical detection system 1 according to the invention for a motor vehicle.
  • the optical detection system 1 is for example intended to be mounted at the rear of a motor vehicle, for example at a bumper or a license plate (not shown). It can also for example be mounted on the sides of the vehicle, for example to replace side mirrors.
  • the optical detection system 1 comprises a protective case 3 and an optical sensor 5, in particular a picture-taking device such as a camera, mounted in the protective case 3.
  • the protective housing 3 is for example of cylindrical shape and comprises at one end 6 a gate 8. In the same figure, the gate 8 is also shown from the front.
  • the optical sensor 5 comprises for example enclosed in a housing 9 a CCD sensor (for "coupled coupled device” or a charge coupled device) or a CMOS measurement sensor composed of a matrix of miniature photodiodes.
  • This measuring sensor is connected for example to a processing unit including a microprocessor for processing the data / images taken.
  • the optical sensor 5 further comprises an optical 1 1 for example a convex lens (curved) such as a fish eye optics ("fish-eye” in English) sealingly attached to the housing 9 in front of the measuring sensor.
  • an optical 1 1 for example a convex lens (curved) such as a fish eye optics ("fish-eye” in English) sealingly attached to the housing 9 in front of the measuring sensor.
  • the gate 8 is arranged on the optical axis A of the optical sensor 5 in the field of view thereof and perpendicularly to this optical axis A,
  • the grid 8 has, for example, meshes 13 of parallelepipedal shape, in particular of square shape.
  • the length of one side of a mesh 13 may be between 0.5 mm and 2.5 mm, in particular equal to 2 mm.
  • the grid 8 is formed in particular of son 15 having a diameter less than 0.05 mm, in particular between 0.02 mm and 0.04 mm.
  • this grid 8 does not appear on the images taken.
  • the grid 8 is for example formed of son 15 of a material that can be exposed to the weather without deterioration, in particular stainless steel or plastic material, in particular composite material, for example a fiber-filled plastic.
  • the grid 8 comprises resistive wires able to heat up by the Joule effect and the gate 8 is configured to be connected to a power source for heating the gate 8.
  • the gate 8 is configured to be connected to a power source for heating the gate 8.
  • the gate 8 has a disk shape.
  • this form of the grid may be different from the moment when the grid 8 has a shape capable of covering the viewing angles of the optical sensor 5.
  • the optical detection system 1 comprises a generator 19 of an air flow towards the gate 8.
  • the generator 19 of an air flow is for example integrated in the protective housing 3 and comprises an air blower 21 disposed at the rear of the protective housing 3. Due to the position of the generator 19, the air flow indicated by arrows 23 surrounds the optical sensor 5.
  • the air flow generator comprises a compressor located outside the protective housing 5 to deliver a flow of compressed air towards the gate 8.
  • the optical detection system 1 further comprises at least one jet nozzle 27 of a washing liquid on the face of the gate 8 facing the optical sensor 5.
  • the system can comprise several jet nozzles 27 of a washing liquid regularly distributed around the optical sensor 5 and projecting inside the protective casing 3.
  • projection nozzles 27 are for example connected to a reservoir of a washing liquid (not shown) with a pump. It can for example be the tank and the pump of a wiper system.
  • the generator 19 of the air stream for example in the form of a blower 21 with rotating blades, drives a flow of air from the rear of the protective box towards the gate 8.
  • This air flow surrounds the optical sensor 5 and allows, if necessary, to clean the grid 8 of dirt that has deposited on the grid 8.
  • This cleaning action can be supported by projections of a washing liquid by the intermediate projection nozzles 27.
  • the optical sensor 5 which is always clear and clean. Thanks to the air flows, the consumption of a washing fluid is limited and there are no problems of traces left by the washing liquid.
  • the optical sensor 5 is also protected independently of the speed of movement of the vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Water Supply & Treatment (AREA)
  • Studio Devices (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Lens Barrels (AREA)
  • Camera Bodies And Camera Details Or Accessories (AREA)
  • Cameras Adapted For Combination With Other Photographic Or Optical Apparatuses (AREA)
  • Accessories Of Cameras (AREA)
  • Optical Measuring Cells (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

Optical detection system (1) for detecting a motor vehicle, comprising: a protective casing (3); an optical sensor (5) in the casing (3); on one side of the casing, a mesh (8) that is located along the optical axis (A) of the optical sensor (5), in the field of vision of the sensor (5), and extends perpendicularly to the optical axis (A); and on the other side of the casing, an air flow generator (19) that generates an air flow in the direction of the mesh (8).

Description

Système de détection optique pour véhicule automobile  Optical detection system for a motor vehicle
La présente invention se rapporte à un système de détection optique pour un véhicule automobile. The present invention relates to an optical detection system for a motor vehicle.
On appelle système de détection optique tout système comportant des capteurs optiques, tels que caméras, capteurs laser (communément appelés LIDARS) ou autre capteurs basés sur l'émission et/ou la détection de la lumière dans le spectre visible ou invisible pour l'homme, en particulier l'infrarouge.  An optical detection system is any system comprising optical sensors, such as cameras, laser sensors (commonly called LIDARS) or other sensors based on the emission and / or detection of light in the visible or invisible spectrum for humans , especially the infrared.
De nos jours, des caméras de vision en particulier arrière équipent un grand nombre des véhicules automobiles actuels, et elles font notamment partie d'un système d'aide au parking qui permet de se garer plus facilement dans un emplacement sans se retourner et de détecter les obstacles situés derrière le véhicule.  Nowadays, especially rear vision cameras equip a large number of the current motor vehicles, and they are part of a parking assistance system that makes it easier to park in a location without turning and to detect the obstacles behind the vehicle.
On connaît des caméras qui sont installées à l'intérieur de l'habitacle contre la lunette / vitre arrière en visant vers l'arrière depuis la lunette arrière du véhicule. Ces caméras sont bien protégées des influences climatiques extérieures et peuvent par exemple bénéficier des systèmes de dégivrage et de nettoyage de la lunette arrière, par exemple d'un fil chauffant intégré dans la vitre de la lunette arrière.  Cameras are known which are installed inside the cockpit against the rear window / bezel looking towards the rear from the rear window of the vehicle. These cameras are well protected from external climatic influences and can for example benefit from the defrosting and cleaning systems of the rear window, for example a heating wire integrated in the glass of the rear window.
Cependant, l'angle de vue n'est pas optimal, notamment pour une aide au parking et pour cette raison, on préfère que la caméra soit agencée au niveau du pare- chocs arrière ou au niveau de la plaque d'immatriculation arrière du véhicule.  However, the angle of view is not optimal, especially for a parking aid and for this reason, it is preferred that the camera is arranged at the rear bumper or at the rear registration plate of the vehicle. .
Dans ce cas, la caméra est donc fortement exposée aux projections de saletés qui peuvent se déposer sur son optique et ainsi réduire son efficacité, voire la rendre inopérante.  In this case, the camera is highly exposed to the projections of dirt that can be deposited on its optics and thus reduce its effectiveness, or even make it inoperative.
En particulier par temps de pluie, on constate des projections de pluie et de saletés qui peuvent grandement affecter l'opérabilité du système de détection optique.  Especially in rainy weather, there are projections of rain and dirt that can greatly affect the operability of the optical detection system.
Pour contrer le dépôt de saletés sur la caméra, il est connu d'agencer un dispositif de nettoyage de l'optique de la caméra, généralement un gicleur de liquide de nettoyage, à proximité de celle-ci, pour supprimer les éléments polluants qui se sont déposés au cours du temps.  To counteract the deposition of dirt on the camera, it is known to arrange a device for cleaning the optics of the camera, usually a nozzle of cleaning fluid, close to it, to remove the polluting elements that are deposited over time.
De même, par temps froid, du givre peut se déposer sur l'optique de la caméra, la rendant inopérante.  Similarly, in cold weather, frost may settle on the optics of the camera, making it inoperative.
Un état de la technique connu est par exemple représenté par le document FR2841488 au nom de la Demanderesse dans laquelle un gicleur projette par exemple un liquide de lavage sous pression sur une vitre de protection de la caméra. Le gicleur est en outre assisté par des moyens de vibration permettant de faire décoller les saletés tenaces de la vitre de protection de la caméra, vitre qui peut être chauffée pour se protéger contre le dépôt de givre par temps froid. A known state of the art is for example represented by the document FR2841488 in the name of the Applicant in which a nozzle projects for example a washing liquid under pressure on a protective glass of the camera. The jet is also assisted by means of vibration to remove stubborn dirt from the protective glass of the camera, glass that can be heated to protect against the deposition of frost in cold weather.
Toutefois, il a été constaté que le fonctionnement de ce système de vision peut être optimisé. En effet, après la projection d'un liquide de lavage sur l'optique de la caméra, il peut rester des gouttes accrochées à la vitre de protection, ce qui nuit et déforme l'image prise par la caméra. La présence des gouttes de liquide de lavage résulte du fait que le liquide de lavage ne glisse pas facilement sur la surface de l'optique de la caméra. De plus, l'évaporation des gouttes sur la vitre de protection laisse des traces qui peuvent se voir sur l'image prise par la caméra.  However, it has been found that the operation of this vision system can be optimized. Indeed, after the projection of a washing liquid on the optics of the camera, there may remain drops attached to the protective glass, which damages and deforms the image taken by the camera. The presence of the washing liquid drops results from the fact that the washing liquid does not slip easily on the surface of the optics of the camera. In addition, the evaporation of the drops on the protective glass leaves traces that can be seen on the image taken by the camera.
Etant donné que les caméras utilisées sont de plus en plus petites, la taille des gouttes accrochées devient importante par rapport à la surface de la vitre de protection et peut altérer de façon importante l'image captée par la caméra.  Since the cameras used are smaller and smaller, the size of the hooked drops becomes large relative to the surface of the protective glass and can significantly alter the image captured by the camera.
La présente invention se propose de remédier au moins partiellement à un ou plusieurs des inconvénients ci-dessus mentionnés en présentant un système de détection optique alternatif permettant d'empêcher le dépôt de salissures sur la caméra. The present invention proposes to remedy at least partially one or more of the aforementioned disadvantages by presenting an alternative optical detection system for preventing the deposit of dirt on the camera.
A cet effet, l'invention a pour objet un système de détection optique d'un véhicule automobile comprenant:  For this purpose, the subject of the invention is an optical detection system of a motor vehicle comprising:
un boîtier de protection, et  a protective case, and
- un capteur optique logé dans le boîtier,  an optical sensor housed in the housing,
caractérisé en ce qu'il comprend d'une part une grille disposée sur l'axe optique du capteur optique dans le champ de vision celui-ci et perpendiculairement à cet axe optique, et d'autre part un générateur d'un flux d'air en direction de la grille.  characterized in that it comprises on the one hand a gate disposed on the optical axis of the optical sensor in the field of view thereof and perpendicular to this optical axis, and on the other hand a generator of a flow of air towards the grid.
Grâce au flux d'air traversant la grille, on crée des micro-turbulences en aval de la grille qui empêchent de l'eau, des poussières ou plus généralement des salissures de traverser la grille en direction de la caméra et de se déposer sur la lentille de la caméra.  Thanks to the flow of air passing through the grid, micro-turbulence is created downstream of the grid which prevents water, dust or more generally dirt from crossing the gate in the direction of the camera and being deposited on the screen. camera lens.
Le système de détection optique selon l'invention peut comporter en outre une ou plusieurs des caractéristiques suivantes prises seules ou en combinaison : The optical detection system according to the invention may further comprise one or more of the following characteristics taken alone or in combination:
Selon un aspect, la grille possède des mailles de forme parallélépipédique, en particulier de forme carrée. La longueur d'un côté d'une maille est par exemple comprise entre 0,5mm et 2,5mm, notamment égale à 2mm. Selon un autre aspect, la grille est formée de fils ayant un diamètre inférieur àIn one aspect, the grid has meshes of parallelepipedal shape, in particular of square shape. The length of a side of a mesh is for example between 0.5mm and 2.5mm, in particular equal to 2mm. In another aspect, the grid is formed of wires having a diameter less than
0,05mm, notamment compris entre 0,02mm et 0,04mm. 0.05mm, in particular between 0.02mm and 0.04mm.
La grille peut être formée de fils en acier inoxydable ou en matériau plastique, en particulier en matériau composite. The grid may be formed of stainless steel wire or plastic material, in particular composite material.
On peut prévoir que la grille comprend des fils résistifs apte à s'échauffer par effet Joule et est configurée pour être connectée à une source d'alimentation électrique pour chauffer la grille. Selon encore un autre aspect, le boîtier de protection possède une forme cylindrique et la grille possède une forme de disque fermant une extrémité des extrémités du boîtier de protection. It can be provided that the grid comprises resistive son able to heat up by Joule effect and is configured to be connected to a power source for heating the grid. In yet another aspect, the protective housing has a cylindrical shape and the grid has a disk shape closing one end of the ends of the protective housing.
En variante ou en complément, le boîtier de protection possède une forme cylindrique et la grille possède une forme apte à couvrir les angles de vision du capteur optique. Alternatively or in addition, the protective housing has a cylindrical shape and the gate has a shape adapted to cover the viewing angles of the optical sensor.
On peut également prévoir que le flux d'air entoure le capteur optique. Selon encore un autre aspect, le générateur de flux d'air est intégré au boîtier de protection. It can also be provided that the air flow surrounds the optical sensor. In yet another aspect, the airflow generator is integrated in the protective housing.
Le générateur de flux d'air comprend par exemple un pulseur d'air disposé en arrière du boîtier de protection. The airflow generator comprises for example an air blower disposed behind the protective housing.
En variante, le générateur de flux d'air comprend un compresseur situé à l'extérieur du boîtier de protection. Alternatively, the airflow generator comprises a compressor located outside the protective housing.
Le système de détection optique peut comprendre en outre au moins une buse de projection d'un liquide de lavage sur la face de la grille en regard du capteur optique. Selon un autre aspect, le système de détection optique comprend plusieurs buses de projection d'un liquide de lavage réparti régulièrement autour du capteur optique et faisant saillie à l'intérieur du boîtier de protection. The optical detection system may further comprise at least one nozzle for spraying a washing liquid on the face of the grid facing the optical sensor. In another aspect, the optical detection system comprises a plurality of spray nozzles of a washing liquid evenly distributed around the optical sensor and projecting inside the protective case.
D'autres avantages et caractéristiques apparaîtront à la lecture de la description de l'invention, ainsi que de la figure 1 unique qui montre selon une vue en coupe longitudinale un schéma simplifié d'un mode de réalisation d'un système de détection optique tout en présentant en détail une grille selon une vue frontale. Les réalisations suivantes sont des exemples. Bien que la description se réfère à un ou plusieurs modes de réalisation, ceci ne signifie pas nécessairement que chaque référence concerne le même mode de réalisation, ou que les caractéristiques s'appliquent seulement à un seul mode de réalisation. De simples caractéristiques de différents modes de réalisation peuvent également être combinées ou interchangées pour fournir d'autres réalisations.  Other advantages and characteristics will appear on reading the description of the invention, as well as in FIG. 1, which shows in a longitudinal sectional view a simplified diagram of an embodiment of an optical detection system. presenting in detail a grid in front view. The following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments may also be combined or interchanged to provide other embodiments.
Dans la description, les termes « amont » et « aval » sont utilisés par rapport à la direction d'acheminement des fluides dans les conduites fluidiques. Ainsi, un premier élément est disposé en amont d'un second élément si le fluide passe d'abord par le premier élément, puis par le second élément.  In the description, the terms "upstream" and "downstream" are used with respect to the flow direction of the fluids in the fluid lines. Thus, a first element is disposed upstream of a second element if the fluid first passes through the first element and then through the second element.
La figure 1 montre un mode de réalisation d'un système 1 de détection optique selon l'invention pour un véhicule automobile.  FIG. 1 shows an embodiment of an optical detection system 1 according to the invention for a motor vehicle.
Le système de détection optique 1 est par exemple destiné à être monté à l'arrière d'un véhicule automobile, par exemple au niveau d'un pare-chocs ou d'une plaque d'immatriculation (non représentés). Il peut aussi par exemple être monté sur les côtés du véhicule, par exemple en remplacement des rétroviseurs latéraux.  The optical detection system 1 is for example intended to be mounted at the rear of a motor vehicle, for example at a bumper or a license plate (not shown). It can also for example be mounted on the sides of the vehicle, for example to replace side mirrors.
Le système de détection optique 1 comprend un boîtier de protection 3 et un capteur optique 5, notamment de prise de vue tel qu'une caméra, monté dans le boîtier de protection 3.  The optical detection system 1 comprises a protective case 3 and an optical sensor 5, in particular a picture-taking device such as a camera, mounted in the protective case 3.
Le boîtier de protection 3 est par exemple de forme cylindrique et comprend à une extrémité 6 une grille 8. Sur la même figure, la grille 8 est également représentée de face.  The protective housing 3 is for example of cylindrical shape and comprises at one end 6 a gate 8. In the same figure, the gate 8 is also shown from the front.
Le capteur optique 5 comprend par exemple enfermé dans un carter 9 un capteur de mesure CCD (pour « charged coupled device » en anglais à savoir un dispositif à transfert de charge) ou un capteur de mesure CMOS composé d'une matrice de photodiodes miniatures. Ce capteur de mesure est relié par exemple à une unité de traitement comprenant notamment un microprocesseur pour traiter les données / images prises. The optical sensor 5 comprises for example enclosed in a housing 9 a CCD sensor (for "coupled coupled device" or a charge coupled device) or a CMOS measurement sensor composed of a matrix of miniature photodiodes. This measuring sensor is connected for example to a processing unit including a microprocessor for processing the data / images taken.
Le capteur optique 5 comprend de plus une optique 1 1 par exemple une lentille convexe (bombée) tel qu'une optique œil de poisson (« fish-eye » en anglais) fixée de façon étanche sur le carter 9 devant le capteur de mesure.  The optical sensor 5 further comprises an optical 1 1 for example a convex lens (curved) such as a fish eye optics ("fish-eye" in English) sealingly attached to the housing 9 in front of the measuring sensor.
Comme on le voit sur la figure, la grille 8 est disposée sur l'axe optique A du capteur optique 5 dans le champ de vision de celui-ci et perpendiculairement à cet axe optique A,  As can be seen in the figure, the gate 8 is arranged on the optical axis A of the optical sensor 5 in the field of view thereof and perpendicularly to this optical axis A,
La grille 8 possède par exemple des mailles 13 de forme parallélépipédique, en particulier de forme carrée. La longueur d'un côté d'une maille 13 peut être comprise entre 0,5mm et 2,5mm, notamment égale à 2mm. La grille 8 est notamment formée de fils 15 ayant un diamètre inférieur à 0,05mm, notamment compris entre 0,02mm et 0,04mm.  The grid 8 has, for example, meshes 13 of parallelepipedal shape, in particular of square shape. The length of one side of a mesh 13 may be between 0.5 mm and 2.5 mm, in particular equal to 2 mm. The grid 8 is formed in particular of son 15 having a diameter less than 0.05 mm, in particular between 0.02 mm and 0.04 mm.
Ainsi, du fait de la proximité de la grille 8 par rapport au capteur optique 5 et de la focale de l'optique 1 1 qui est par exemple supérieure à 1 m , cette grille 8 n'apparaît pas sur les images prises.  Thus, because of the proximity of the gate 8 relative to the optical sensor 5 and the focal length of the optical 1 1 which is for example greater than 1 m, this grid 8 does not appear on the images taken.
La grille 8 est par exemple formée de fils 15 en un matériau qui peut être exposé aux intempéries sans s'altérer en particulier en acier inoxydable ou en matériau plastique, en particulier du matériau composite, par exemple un plastique chargé de fibres.  The grid 8 is for example formed of son 15 of a material that can be exposed to the weather without deterioration, in particular stainless steel or plastic material, in particular composite material, for example a fiber-filled plastic.
Selon une variante, la grille 8 comprend des fils résistifs apte à s'échauffer par effet Joule et la grille 8 est configurée pour être connectée à une source d'alimentation électrique pour chauffer la grille 8. Ainsi, si de la glace s'est déposée sur la grille 8, celle-ci peut être éliminée par réchauffement de la grille 8 en alimentant les fils résistifs par un courant électrique. Les fils résistifs peuvent former au moins en partie les fils 15 de la grille 8.  According to one variant, the grid 8 comprises resistive wires able to heat up by the Joule effect and the gate 8 is configured to be connected to a power source for heating the gate 8. Thus, if ice has become deposited on the grid 8, it can be removed by heating the gate 8 by feeding the resistive son by an electric current. The resistive wires may form at least part of the wires 15 of the grid 8.
Pour bien fermer l'extrémité 6 du boîtier de protection 3, la grille 8 possède une forme de disque.  To properly close the end 6 of the protective housing 3, the gate 8 has a disk shape.
En variante, cette forme de la grille peut être différente du moment que la grille 8 possède une forme apte à couvrir les angles de vision du capteur optique 5.  As a variant, this form of the grid may be different from the moment when the grid 8 has a shape capable of covering the viewing angles of the optical sensor 5.
A l'extrémité 17 du boîtier de protection 3 qui est opposée à l'extrémité 6 portant la grille 8, le système de détection optique 1 comprend un générateur 19 d'un flux d'air en direction de la grille 8.  At the end 17 of the protective housing 3 which is opposite the end 6 carrying the gate 8, the optical detection system 1 comprises a generator 19 of an air flow towards the gate 8.
Le générateur 19 d'un flux d'air est par exemple intégré au boîtier de protection 3 et comprend un pulseur d'air 21 disposé à l'arrière du boîtier de protection 3. Du fait de la position du générateur 19, le flux d'air indiqué par des flèches 23 entoure le capteur optique 5. The generator 19 of an air flow is for example integrated in the protective housing 3 and comprises an air blower 21 disposed at the rear of the protective housing 3. Due to the position of the generator 19, the air flow indicated by arrows 23 surrounds the optical sensor 5.
Selon une variante non représentée, le générateur de flux d'air comprend un compresseur situé à l'extérieur du boîtier de protection 5 pour délivrer un flux d'air comprimé en direction de la grille 8.  According to a variant not shown, the air flow generator comprises a compressor located outside the protective housing 5 to deliver a flow of compressed air towards the gate 8.
De façon facultative, le système de détection optique 1 comprend en outre au moins une buse de projection 27 d'un liquide de lavage sur la face de la grille 8 en regard du capteur optique 5.  Optionally, the optical detection system 1 further comprises at least one jet nozzle 27 of a washing liquid on the face of the gate 8 facing the optical sensor 5.
Comme on le voit sur la figure, le système peut comprendre plusieurs buses de projection 27 d'un liquide de lavage réparti régulièrement autour du capteur optique 5 et faisant saillie à l'intérieur du boîtier de protection 3.  As can be seen in the figure, the system can comprise several jet nozzles 27 of a washing liquid regularly distributed around the optical sensor 5 and projecting inside the protective casing 3.
Ces buses de projection 27 sont par exemple reliées à un réservoir d'un liquide de lavage (non représenté) avec une pompe. Il peut par exemple s'agir du réservoir et de la pompe d'un système d'essuyage.  These projection nozzles 27 are for example connected to a reservoir of a washing liquid (not shown) with a pump. It can for example be the tank and the pump of a wiper system.
En fonctionnement, le générateur 19 du flux d'air, par exemple sous forme d'un pulseur 21 avec des pales rotatives, anime un flux d'air depuis l'arrière du boîtier de protection en direction de la grille 8.  In operation, the generator 19 of the air stream, for example in the form of a blower 21 with rotating blades, drives a flow of air from the rear of the protective box towards the gate 8.
Ce flux d'air entoure le capteur optique 5 et permet, si besoin, de nettoyer la grille 8 de salissures qui se sont déposées sur la grille 8. Cette action de nettoyage peut être soutenue par des projections d'un liquide de lavage par l'intermédiaire des buses de projection 27.  This air flow surrounds the optical sensor 5 and allows, if necessary, to clean the grid 8 of dirt that has deposited on the grid 8. This cleaning action can be supported by projections of a washing liquid by the intermediate projection nozzles 27.
En cas de glace déposée sur la grille 8, celle-ci peut être chauffée pour faire fondre cette glace.  In case of ice deposited on the grid 8, it can be heated to melt the ice.
Puis, du fait du flux d'air constant, on crée au niveau de la grille 8 en aval de celle-ci des micro-turbulences qui empêchent les salissures et de l'eau de pénétrer dans le boîtier de protection 3.  Then, because of the constant air flow, it creates at the gate 8 downstream thereof micro-turbulence which prevents soiling and water from entering the protective housing 3.
Ainsi, on obtient un champ de vision pour le capteur optique 5 qui est toujours dégagé et propre. Grâce aux flux d'air, on limite la consommation d'un fluide de lavage et il n'y a pas de problèmes de traces laissées par le liquide de lavage. Le capteur optique 5 est aussi protégé indépendamment de la vitesse de déplacement du véhicule.  Thus, a field of view is obtained for the optical sensor 5 which is always clear and clean. Thanks to the air flows, the consumption of a washing fluid is limited and there are no problems of traces left by the washing liquid. The optical sensor 5 is also protected independently of the speed of movement of the vehicle.

Claims

REVENDICATIONS
Système de détection optique (1 ) d'un véhicule automobile comprenant: An optical sensing system (1) of a motor vehicle comprising:
- un boîtier de protection (3), et  a protective case (3), and
- un capteur optique (5) logé dans le boîtier (3),  an optical sensor (5) housed in the housing (3),
caractérisé en ce qu'il comprend d'une part une grille (8) disposée sur l'axe optique (A) du capteur optique (5) dans le champ de vision celui-ci et perpendiculairement à cet axe optique (A), et d'autre part un générateur (19) d'un flux d'air en direction de la grille (8). characterized in that it comprises on the one hand a gate (8) disposed on the optical axis (A) of the optical sensor (5) in the field of view thereof and perpendicular to this optical axis (A), and on the other hand a generator (19) of an air flow towards the gate (8).
Système de détection optique selon la revendication 1 , caractérisé en ce que la grille (8) possède des mailles (13) de forme parallélépipédique, en particulier de forme carrée. Optical detection system according to claim 1, characterized in that the grid (8) has meshes (13) of parallelepipedal shape, in particular of square shape.
Système de détection optique selon la revendication 2, caractérisé en ce que la longueur d'un côté d'une maille (13) est comprise entre 0,5mm et 2,5mm, notamment égale à 2mm. Optical detection system according to claim 2, characterized in that the length of one side of a mesh (13) is between 0.5mm and 2.5mm, in particular equal to 2mm.
Système de détection optique selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la grille (8) est formée de fils (15) ayant un diamètre inférieur à 0,05mm, notamment compris entre 0,02mm et 0,04mm. Optical detection system according to any one of Claims 1 to 3, characterized in that the grid (8) is formed of wires (15) having a diameter of less than 0.05 mm, in particular between 0.02 mm and 0.04 mm. .
Système de détection optique selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la grille (8) est formée de fils (15) en acier inoxydable ou en matériau plastique, en particulier en matériau composite. Optical detection system according to any one of claims 1 to 4, characterized in that the grid (8) is formed of son (15) of stainless steel or plastic material, in particular of composite material.
Système de détection optique selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la grille (8) comprend des fils (15) résistifs apte à s'échauffer par effet Joule et est configurée pour être connectée à une source d'alimentation électrique pour chauffer la grille (8). Optical detection system according to any one of claims 1 to 5, characterized in that the gate (8) comprises resistive son (15) able to heat up by Joule effect and is configured to be connected to a source of power supply for heating the grid (8).
Système de détection optique selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le boîtier de protection (3) possède une forme cylindrique et la grille (8) possède une forme de disque fermant une extrémité (6) des extrémités du boîtier de protection (3). Système de détection optique selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le boîtier de protection (3) possède une forme cylindrique et la grille (8) possède une forme apte à couvrir les angles de vision du capteur optique. Optical sensing system according to one of Claims 1 to 6, characterized in that the protective casing (3) has a cylindrical shape and the grating (8) has a disk-like shape closing one end (6) of the ends of the protective case (3). Optical detection system according to one of Claims 1 to 6, characterized in that the protective housing (3) has a cylindrical shape and the grid (8) has a shape suitable for covering the viewing angles of the optical sensor.
Système de détection optique selon l'une quelconque des revendications 1 à 8, caractérisé en ce que le flux d'air entoure le capteur optique (5). Optical detection system according to one of Claims 1 to 8, characterized in that the air flow surrounds the optical sensor (5).
0. Système de détection optique selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le générateur de flux d'air (19) est intégré au boîtier de protection (3). 0. Optical detection system according to any one of claims 1 to 9, characterized in that the air flow generator (19) is integrated in the protective housing (3).
1 1 . Système de détection optique selon la revendication 10, caractérisé en ce que le générateur de flux d'air (19) comprend un pulseur d'air (21 ) disposé en arrière du boîtier de protection (13). 1 1. Optical detection system according to Claim 10, characterized in that the air flow generator (19) comprises an air blower (21) arranged behind the protective casing (13).
12. Système de détection optique selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le générateur de flux d'air (19) comprend un compresseur situé à l'extérieur du boîtier de protection (3). Optical detection system according to one of Claims 1 to 9, characterized in that the air flow generator (19) comprises a compressor located outside the protective casing (3).
13. Système de détection optique selon l'une quelconque des revendications 1 à 12, caractérisé en ce qu'il comprend en outre au moins une buse de projection (27) d'un liquide de lavage sur la face de la grille (8) en regard du capteur optique (5). 13. Optical detection system according to any one of claims 1 to 12, characterized in that it further comprises at least one spray nozzle (27) of a washing liquid on the face of the grid (8). facing the optical sensor (5).
14. Système de détection optique selon la revendication 13, caractérisé en ce qu'il comprend plusieurs buses de projection (27) d'un liquide de lavage réparti régulièrement autour du capteur optique (5) et faisant saillie à l'intérieur du boîtier de protection (3). 14. Optical detection system according to claim 13, characterized in that it comprises several spray nozzles (27) of a washing liquid regularly distributed around the optical sensor (5) and projecting inside the housing of protection (3).
EP17708556.0A 2016-03-10 2017-03-08 Optical detection system for motor vehicle Withdrawn EP3427109A1 (en)

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FR1652015A FR3048659B1 (en) 2016-03-10 2016-03-10 OPTICAL DETECTION SYSTEM FOR MOTOR VEHICLE
PCT/EP2017/055452 WO2017153476A1 (en) 2016-03-10 2017-03-08 Optical detection system for motor vehicle

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BR (1) BR112018016316A2 (en)
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MX2018010922A (en) 2019-02-13
US20190071058A1 (en) 2019-03-07
FR3048659B1 (en) 2018-04-13
BR112018016316A2 (en) 2018-12-26
RU2018135381A (en) 2020-04-10
KR20190008190A (en) 2019-01-23
FR3048659A1 (en) 2017-09-15
JP2019516121A (en) 2019-06-13
WO2017153476A1 (en) 2017-09-14

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