• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a cleaning device (1) for an optical sensor (3), in particular intended to equip a motor vehicle, comprising a dispensing nozzle (5) for a cleaning liquid, characterized in that the nozzle of distribution (5) of the cleaning liquid is of the drip type and configured to deposit individual drops of cleaning liquid on the optical sensor (3).
    公开号:FR3056528A1
    申请号:FR1659284
    申请日:2016-09-29
    公开日:2018-03-30
    发明作者:Gilles Le-Calvez；Marcel Trebouet；Frederic Bretagnol；Giuseppe Grasso；Gregory Kolanowski
    申请人:Valeo Systemes dEssuyage SAS；
    IPC主号:
    专利说明:

    © Publication number: 3,056,528 (to be used only for reproduction orders) (© National registration number: 16 59284 ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY
    COURBEVOIE © Int Cl 8 : B 60 S 1/56 (2017.01), B 60 S 1/52, B 60 R 1/00
    A1 PATENT APPLICATION
    (© Date of filing: 29.09.16. © Applicant (s): VALEO WIPING SYSTEMS (© Priority: Simplified joint stock company - FR. @ Inventor (s): LE-CALVEZ GILLES, TREBOUET MARCEL, BRETAGNOL FREDERIC, GRASSO GIU- (43) Date of public availability of the SEPPE and KOLANOWSKI GREGORY. request: 30.03.18 Bulletin 18/13. (© List of documents cited in the report of preliminary research: Refer to end of present booklet (© References to other national documents ® Holder (s): VALEO WIPING SYSTEMS related: Joint stock company. ©) Extension request (s): © Agent (s): VALEO WIPING SYSTEMS INDUSTRIAL PROPERTY SERVICE.
    DEVICE FOR CLEANING AN OPTICAL SENSOR, DRIVING ASSISTANCE SYSTEM AND METHOD FOR CLEANING THE SAME.
    FR 3 056 528 - A1 (tV) The present invention relates to a cleaning device (1) for an optical sensor (3), in particular intended to equip a motor vehicle, comprising a dispensing nozzle (5) of a cleaning, characterized in that the dispensing nozzle (5) of the cleaning liquid is of the drip type and configured to deposit, by individual drops, cleaning liquid on the optical sensor (3).

    DEVICE FOR CLEANING AN OPTICAL SENSOR, DRIVING ASSISTANCE SYSTEM AND METHOD FOR CLEANING THEREOF
    The present invention relates to the field of driving assistance and in particular to driving assistance systems, installed on certain vehicles. The driving assistance system may include an optical sensor, such as for example a camera comprising a lens. More particularly, the invention relates to a device for cleaning such an optical sensor, and to a method for cleaning an optical sensor implemented by this cleaning device, the optical sensor being able to be arranged inside a body element of a motor vehicle for example.
    Currently, front, rear and side vision cameras are used in a large number of motor vehicles. They are in particular part of driving assistance systems, such as parking assistance systems or line crossing detection systems for example.
    Cameras are known which are installed inside the passenger compartment, against the rear window for example, for parking assistance. These cameras are well protected from external climatic hazards and dirt which can be caused by organic or mineral pollutants. Such cameras can also benefit from defrosting and cleaning systems of the rear window for example, such as a heating wire integrated in the rear window which can ensure the defrosting of the rear window and of the optical sensor installed in this configuration.
    However, the viewing angle proposed by such cameras is not optimal, in particular for a parking aid, because they do not allow to see the obstacles being near the rear of the vehicle for example. It is partly for this reason that it is preferable to install these driving assistance systems outside the passenger compartment, in different places according to the desired use, such as for example at the level of the plate. registration or in the exterior mirrors.
    In such a case, the driving assistance system, and in particular the camera of such a system, is highly exposed to the vagaries of the weather as well as to projections of organic or mineral soiling. In rainy weather, or in the case of snow for example, we notice projections of rain, dirt, salt or snow which can greatly affect the operability of the driving assistance system, or even make it inoperative .
    It therefore appears necessary to regularly clean these driving assistance systems in order to ensure good operability of the latter.
    However, if the vehicle comprises several driving assistance systems comprising optical sensors, the quantity of cleaning liquid necessary to ensure their good operability can be significant, which implies that the tank of cleaning liquid must be large enough to Avoid the vehicle user having to fill the cleaning fluid tank too often.
    In addition, increasing the volume of cleaning fluid inside the vehicle will increase its mass and therefore increase its energy consumption.
    Document EP2252481 discloses a driving assistance system equipped with an optical sensor and comprising a device for cleaning this optical sensor having a nozzle for spraying a cleaning liquid. The projection nozzle according to this document is movable below the optical sensor between a retracted position and a cleaning position. The projection nozzle is configured to spray on the optics thereof a cleaning liquid.
    However, such a cleaning device cannot be used simultaneously with the use of the driving assistance system because the projection nozzle, when the latter is in the cleaning position, is located in the field of vision. of the optical sensor. Thus, during the cleaning phases of the optical sensor, it is inoperative. Furthermore, such a cleaning device seems to use relatively large amounts of cleaning liquid due to the spraying of this cleaning liquid.
    On the other hand, document FR2861348 is known, in the name of the applicant, a device for cleaning an optical sensor installed in a protective casing of the latter comprising a vision window. The cleaning device comprises a nozzle for spraying a cleaning liquid for spraying cleaning liquid onto the viewing window of the protective housing.
    However, it is possible that such a cleaning device consumes fairly large amounts of cleaning liquid.
    Document FR2858280 is also known, in the name of the applicant, a rear vision device for a motor vehicle having an optical sensor inside a protective housing. The protective housing includes a vision window disposed facing the optics of the optical sensor and means for cleaning this vision window. The cleaning means described in this document have for example a scraper seal used to wipe the viewing window of the protective housing, installed in front of the optical sensor.
    However, such cleaning means may not be sufficiently effective in the case of dirt embedded on the viewing window. Furthermore, the presence of the scraper seal can create micro-scratches on the vision window and in the more or less long term these micro-scratches can affect the good operability of the rear vision device.
    The present invention proposes to remedy at least partially the drawbacks of the prior art mentioned above by proposing a device for cleaning an optical sensor, intended to be installed on a motor vehicle, allowing effective cleaning of said sensor optical.
    Another objective of the present invention, distinct from the first, is to provide a device for cleaning an optical sensor having a low consumption of cleaning liquid.
    Another objective of the present invention, distinct from the previous objectives, is to provide a driving assistance system having a cleaning device allowing the optical sensor fitted to such a driving assistance system to have optimized operation whatever whatever the climatic conditions.
    To this end, the subject of the invention is a device for cleaning an optical sensor installed in a housing, in particular intended to equip a motor vehicle, comprising a nozzle for dispensing a cleaning liquid, characterized in that the nozzle cleaning liquid dispensing system is of the drip type and is configured to deposit cleaning liquid by individual drops on the optical sensor.
    Thus, the cleaning device can be installed on any type of optical sensor comprising an optic, such as a camera comprising a lens, intended to equip a motor vehicle, such as for example optical sensors installed inside bodywork elements or still optical sensors installed outside the vehicle.
    By "dirt" is meant both traces of organic pollutants, such as insects, or minerals, such as mud, as traces left by drops of water for example.
    When it rains, for example, dirt may settle on the optics of the optical sensor and may affect the proper functioning of said optical sensor. The cleaning device can effectively control the cleaning of this optical sensor without necessarily using large amounts of cleaning liquid by depositing one or more drop (s) of cleaning liquid on the optics of the optical sensor.
    The device for cleaning the optical sensor according to the invention may also include one or more of the following characteristics, taken alone or in combination:
    The cleaning device comprises a support for the nozzle for dispensing the cleaning liquid, said support being fixedly fixed relative to the cleaning device.
    The cleaning liquid dispensing nozzle can be configured to be movably mounted in the support between:
    a rest position in which the dispensing nozzle is configured to be set back from an optical sensor optics, and an active position in which the dispensing nozzle is configured to be located above the optical sensor optics so as to deposit said at least one drop of cleaning liquid on the optics of the optical sensor by gravity.
    The cleaning device may include a metering pump configured to supply the dispensing nozzle with cleaning liquid in order to deposit a predefined volume of cleaning liquid drop by drop on the optical sensor.
    According to a particular embodiment, the dispensing nozzle can be mounted to be movable telescopically to pass from its rest position to its active position.
    According to another embodiment, the dispensing nozzle can be mounted movable in translation to pass from its rest position to its active position.
    The cleaning device can also comprise a movable projection element between:
    a retracted position in which the projection element is configured to be positioned outside the field of vision of the optical sensor, and at least one cleaning position in which the projection element is configured to be positioned in front of the optical sensor.
    When the projection element occupies a cleaning position, it is located between the optics and one or more objects whose images are transmitted by the optical sensor.
    The projection element includes a nozzle for projecting a flow of compressed air configured to project a flow of compressed air onto the optic when the projection element is in a cleaning position.
    Alternatively, the projection element may include a flexible blade configured to allow cleaning by mechanical action of the optics of the optical sensor.
    The cleaning device may include a drive mechanism configured to move the projection element between its retracted position and said at least one cleaning position.
    Alternatively, the drive mechanism may include at least one actuator connected directly to the projection member so as to move the projection member between its retracted position and a cleaning position.
    According to another variant, the drive mechanism may include at least one actuator and a coupling system configured to be driven by the at least one actuator so as to move the projection element between its retracted position and a cleaning position .
    According to this other variant, the actuator cooperates with the coupling system using at least one of the elements chosen from the following list: a drive roller, a system of complementary gears, a belt, a system with pinion and rack.
    The projection element can be movable in rotation between its retracted position and said at least one cleaning position.
    The present invention also relates to a driving assistance system comprising at least one cleaning device as described above, at least one optical sensor, and at least one electronic control unit configured to control the cleaning device.
    The use of such a driving assistance system makes it possible to refrain from carrying out manual cleaning of the optics of the optical sensor in order to remove encrusted dirt and to maintain good operability of the assistance system. to driving.
    The driving assistance system according to the invention may further comprise one or more of the following characteristics taken alone or in combination.
    The electronic control unit can be configured to control the drive mechanism, so as to move the projection element between its retracted position and said at least one cleaning position.
    The electronic control unit can be configured to trigger the projection of the compressed air flow on the optics when the projection element is in a cleaning position and to stop said projection of the compressed air flow when the element projection has returned to the retracted position.
    Alternatively, the electronic control unit can be configured to control the projection pressure of the compressed air flow on the optics of the optical sensor.
    The electronic control unit can be configured to control the volume of cleaning liquid drawn in by the dosing pump and deposited in a drop-by-drop fashion on the optics of the optical sensor.
    The invention also relates to a method for cleaning an optical sensor composing a driving assistance system as described above, characterized in that it comprises the following steps:
    setting in motion the projection element to bring said projection element into at least one cleaning position, depositing at least a first drop of cleaning liquid on the optics of the optical sensor, and projection of a first flow compressed air on the optics.
    The method of cleaning the optical sensor according to the invention, using for example a single drop of cleaning liquid, makes it possible to refrain from using large quantities of cleaning liquid in order to allow a satisfactory state of cleanliness so that the optical sensor retains good operability whatever the climatic conditions.
    The use of a first flow of compressed air in the form of a pressurized blade for example makes it possible to take off and eject the dirt which may have deposited on the optics of the optical sensor so that the latter retains good operability. Thus, the use of the projection of a compressed air flow in addition to the cleaning liquid makes it possible, among other things, to further reduce the volumes required of cleaning liquid to have effective cleaning of the optics of such a optical sensor.
    The method according to the invention can also further comprise the following steps taken alone or in combination:
    deposition of at least a second drop of cleaning liquid on the optics of the optical sensor, projection of a second flow of compressed air, said second flow of compressed air being projected with a pressure lower than that of the first flow d compressed air, on the optics of the optical sensor, and setting in motion of the projection element to bring said projection element from said at least one cleaning position to the retracted position.
    On the other hand, the cleaning liquid used during this process can comprise an adjuvant configured to deposit a protective layer on the optic in order to facilitate cleaning of this optic.
    The deposition of a second drop of cleaning liquid as well as the projection of the second flow of compressed air makes it possible to implement a preventive treatment step in order to deposit a protective layer on the optics to limit the possibilities of adhesion. dirt on it or to facilitate their removal. Indeed, the second air flow makes it possible to spread the drop of cleaning liquid on the optics and when the cleaning liquid has an adjuvant, this can deposit a protective layer on the optics on which the dirt come to settle. The protective layer can be semi-soluble, which makes it possible to remove it as well as the dirt deposited on it by simple wetting.
    Other advantages and characteristics will appear on reading the description and the appended drawings in which:
    Figure 1 is a schematic representation of a driving assistance system mounted in a body element of a motor vehicle and comprising a device for cleaning an optical sensor, Figure 2 is a schematic side representation of the device showing a more detailed projection element of the cleaning device, Figure 3 is a schematic rear perspective view of the driving assistance system of Figure 2 showing the cleaning device with the projection element in a retracted position, FIG. 4 is a partial diagrammatic representation in perspective of the projection element, FIG. 5A is a diagrammatic representation before partial in perspective of the driving assistance system comprising a dispensing nozzle having an end for depositing rectangular shape, Figure 5B is a partial front schematic representation in perspective of the assistance system ance to the pipe comprising a dispensing nozzle having an oval shaped deposit end, FIG. 5C is a schematic partial front perspective view of the pipe assistance system comprising a dispensing nozzle having a circular shaped deposit end , Figure 6 is a schematic perspective view of the driving assistance system of Figure 2 showing the cleaning device with the projection element in a first cleaning position, Figure 7 is a schematic perspective view of the driving assistance system of FIG. 6 showing the cleaning device with the projection element in an intermediate cleaning position, FIG. 8 is a schematic perspective view of the driving assistance system of FIGS. 6 and 7 showing the cleaning device with the projection element in a final cleaning position, FIG. 9 A is a schematic front representation of the driving assistance system with the projection element in the retracted position, FIG. 9B is a schematic front representation of the driving assistance system with the projection element in its final position Figure 10 is a schematic perspective view in partial section of the driving assistance system of Figure 9B, Figure 11 is an operating diagram of the cleaning device according to a first embodiment, and the Figure 12 is an operating diagram of the cleaning device according to a second embodiment.
    In these figures, identical elements have the same reference numerals.
    The following embodiments 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 characteristics apply only to a single embodiment. Simple features of different embodiments can also be combined or interchanged to provide other embodiments.
    In the following description, reference is made to a first and a second drop of cleaning liquid, or else to a first and to a second flow of compressed air. It is a simple indexing to differentiate and name similar but not identical elements. This indexing does not imply a priority of one element over another and one can easily interchange such names without departing from the scope of this description. This indexing also does not imply an order in time for example to assess the operation of the cleaning device of the optical sensor.
    In the following description, the term “soiling” is understood to mean both water drops and traces of organic pollutants, such as insects for example, or minerals, such as traces of mud for example.
    In the following description, the term "top", "upper" and "above" means the arrangement of these elements in the figures which generally corresponds to their arrangement in the mounted state in a bodywork element of a vehicle. automobile. In the following description, the term "compressed air blade" means the projection of compressed air under high pressure in order to eject dirt which could be encrusted on the optics of the optical sensor. Similarly, the term "compressed air stream" means the projection of compressed air under low pressure in order to spread only the cleaning liquid on the optics and thus allow the optics of the optical sensor to dry.
    Furthermore, in the following description, the term "metering pump" means a pump used for precise and repeatable injection of small quantities of more or less viscous liquids or fluids according to a defined cycle.
    In addition, in the following description, the term "connection" or "connector" means an element making it possible to supply a cleaning liquid to a dispensing nozzle so that the latter can deposit at least one drop of cleaning liquid on an optical sensor.
    Finally, in the following description, the term “adjuvant” is understood to mean a product which is added to another in order to improve or change certain properties thereof. In the present case, the adjuvant may already be present in the cleaning liquid or added to it and it makes it possible to change certain properties of the cleaning liquid.
    Referring to Figures 1 and 2, there is shown a driving assistance system 10 comprising an optical sensor 3 having an optic 4 and a cleaning device 1 of the optical sensor 3, in particular intended to equip a motor vehicle.
    Advantageously, the optical sensor 3 is carried by the cleaning device 1. According to the embodiment shown in Figures 1, 2 and 6 to 10, the optical sensor 3 is a part attached to the cleaning device 1. For this purpose, the cleaning device 1 comprises a housing 20 having a housing configured to receive the optical sensor 3. This housing 20 is for example installed in a body element 22 of the motor vehicle.
    According to the particular embodiment of Figures 1 and 2, the optical sensor 3 is installed in the housing 20 so that the optics 4 of this optical sensor 3 protrudes from this body element 22 in order to provide a wide angle of view . However, according to another embodiment not shown here, the housing 20 carrying the optical sensor 3 can be installed outside the vehicle. The cleaning device 1 according to FIGS. 1 and 2 also allows the optical sensor 3 to maintain good operability whatever the climatic conditions and also to maintain a satisfactory state of cleanliness to ensure its proper functioning.
    More particularly, the cleaning device 1 comprises a nozzle 5 for dispensing a cleaning liquid. The cleaning device 1 advantageously comprises a metering pump 8 making it possible to supply the dispensing nozzle 5 with cleaning liquid coming from a tank of cleaning liquid 12 provided in the motor vehicle. The cleaning device 1 can also comprise a projection element 7 (better visible in FIGS. 3 and 4) described in more detail later.
    In other words, the metering pump 8 is configured to pump the cleaning liquid from the cleaning liquid tank 12 to the dispensing nozzle 5 for the cleaning liquid. The cleaning liquid reservoir 12 is therefore in fluid communication with the nozzle 5 for distributing cleaning liquid.
    According to the embodiment of Figures 1 and 2, the dispensing nozzle 5 has a connection 25 configured to be connected to the metering pump 8 in order to allow the fluid communication tank 12 to be placed in fluid communication with the dispensing nozzle 5
    The metering pump 8 can be a separate part from the dispensing nozzle 5.
    Alternatively, the metering pump 8 can be included in the dispensing nozzle 5.
    Alternatively, the metering pump 8 can be of the piezoelectric type.
    In addition, the dispensing nozzle 5 of the cleaning liquid is of the drip type. Referring to FIG. 2, this dispensing nozzle 5 comprises an end configured to deposit a drop or more drops of cleaning liquid in a drip on the optics 4 of the optical sensor 3. According to this particular embodiment, a drop of cleaning liquid corresponds to a volume of 100 μl of cleaning liquid when the optic 4 has a diameter of 15 mm. The use of such volumes for cleaning the optics 4 makes it possible to greatly limit the consumption of cleaning liquid of the cleaning device 1.
    Furthermore, according to the embodiment illustrated in Figures 1 to 3 and 9A, the dispensing nozzle 5 is fixedly mounted on the housing 20. For this purpose, the housing 20 includes a support 6 for receiving the dispensing nozzle 5. This support 6 is, in this example, disposed in a fixed manner relative to the housing 20.
    According to other variants, the dispensing nozzle 5 can be mounted mobile relative to the support 6.
    Thus, according to a first alternative embodiment, the dispensing nozzle 5 can be configured to be movably mounted in the support 6 between a rest position and an active position. In the rest position, the dispensing nozzle 5 is advantageously set back relative to the optics 4 of the optical sensor 3, for example the dispensing nozzle 5 can be in a retracted position. On the other hand, in the active position, as illustrated in FIG. 1 or 2, the dispensing nozzle 5 is located above the optics 4 in the assembled state of the cleaning device 1 on a motor vehicle for example. In this active position, a drop or several drops of cleaning liquid are deposited on the optics 4 by gravity in order to allow the cleaning liquid to spread on the optics 4 and to wet the dirt which may have become encrusted. on optics 4 in order to desorb these soils and thus facilitate their removal.
    According to a second variant, the dispensing nozzle 5 is mounted mobile in the support 6, telescopically relative to the optics 4 of the optical sensor 3.
    According to a third alternative embodiment not shown here, the dispensing nozzle 5 can be mounted movable in translation relative to the optical sensor 3. This mobility of the dispensing nozzle 5 makes it possible to protect the latter from the projection of solid particles, such as small gravel for example, which could obstruct the dispensing nozzle 5 and thus impair its proper functioning.
    Returning to the particular embodiment of FIGS. 1 and 2, whatever the position of the dispensing nozzle 5, the latter is not in the field of vision of the optical sensor 3. Thus, it does not appear on the images transmitted by the optical sensor 3 to the user and therefore does not interfere with the proper functioning of the optical sensor 3.
    With reference to FIGS. 5A to 5C, the end of the dispensing nozzle 5 is arranged so as to allow the deposition of at least one drop of cleaning liquid has an opening, for example of substantially rectangular shape (FIG. 5A), oval (FIG. 5B), or circular (FIG. 5C), the dimensions of which are chosen to be sufficient for the drop (s) deposited on the optic 4 of the optical sensor 3 to be able to cover a large surface of the optic 4 and to be easily distributed to then wet all of this optic 4. In particular, the opening of the dispensing nozzle 5 is provided to be fairly wide and preferably at least as wide as the optic 4.
    Furthermore, the dispensing nozzle 5 is according to the example of FIG. 1, supplied by the metering pump 8 with cleaning liquid, in order to deposit a predefined volume of cleaning liquid drop by drop on the optics 4 of the optical sensor 3. The use of such a metering pump 8 makes it possible to reduce the consumption of cleaning liquid of such a cleaning device 1. In fact, the metering pump 8 allows only the necessary quantity of cleaning liquid to be drawn into the cleaning liquid reservoir 12 in order to deposit one or more drop (s) of cleaning liquid on the optics 4. Furthermore, the absence of pressure projection of this cleaning liquid can also make it possible to avoid the losses thereof linked to its spraying. Indeed, when the cleaning liquid is sprayed on the optic 4, drops can rebound on this optic 4 and be directly ejected, which can cause a wasting of the cleaning liquid, a use in larger quantities to obtain a cleaning efficient optics 4, and therefore operation of the cleaning device 1 quite expensive.
    Finally, the cleaning liquid used can have a viscosity higher than that of water, for example between 0.001 and 10 Pascal-seconds (Pa.s). The use of a cleaning liquid having such a viscosity allows it to spread relatively slowly on the optics 4, that is to say so as to allow the cleaning liquid to coat the dirt and moisten it sufficiently to reduce its adhesion to the optics 4, thus promoting its descaling.
    Furthermore, the cleaning liquid used advantageously has a surface tension of between 17 and 75 (10-3 x Newton.m-1) thus allowing very good wetting of the surface of the lens 4 and of the dirt which may be present. on this one.
    The cleaning liquid can also have a high detergent power in order to improve its effectiveness in removing dirt from the optics 4. Furthermore, the cleaning liquid can comprise an optically transparent adjuvant configured to deposit a protective layer when the cleaning liquid spreads over the optic 4 of the optical sensor 3 in order to be able to prevent and limit the adhesion of dirt on this optic 4 and also facilitate cleaning of this optic 4. Preferably, this optically transparent adjuvant is a compound of the family of polyethylene glycols. This adjuvant allows the deposition of a protective layer on the optics 4. This protective layer is advantageously soluble and dirt is deposited on it. When it rains, or a drop of cleaning liquid is deposited on the lens 4, this protective layer is dissolved and the dirt present on this protective layer is thus easily removed.
    As regards the projection element 7 which is better visible in FIG. 4, it is advantageously configured to be movable between a retracted position (FIGS. 3 and 9A) and at least one cleaning position (FIGS. 1, 2, 6 to 8 , 9B, and 10). According to the embodiments described, the projection element 7 is movable between a first cleaning position or low position (FIG. 6) and a final cleaning position or high position (FIGS. 8 and 10), passing through one or more several intermediate positions (figure 7).
    When the projection element 7 occupies its retracted position (FIGS. 3 and 9A), it is configured to be positioned outside the field of vision of the optical sensor 3. This makes it possible to avoid the problems which could be linked to the diffraction of the light or the possible distortion of the transmitted images. On the other hand, when the projection element 7 occupies one of the cleaning positions, it is positioned in front of the optical sensor 3 (Figures 1,2, 6 to 8, 9B, and 10).
    The projection element 7 follows for example an upward movement when it passes from its retracted position to one of its cleaning positions and a downward movement when it passes from one of its cleaning positions to its retracted position.
    According to the particular embodiment of FIGS. 6 to 8, the projection element 7 is movable in rotation about an axis perpendicular to an optical axis 30 of the optical sensor 3.
    Referring again to Figure 4, the projection element 7 has a wall 31. This wall 31 has on either side of the fingers 34 which allow the installation in a fixed or movable manner in rotation between an inactive position and a camera-facing position of a flap 32 configured to come in front of the optical sensor 3 when the projection element 7 occupies one of its different cleaning positions. The flap 32 makes it possible, for example, to limit aerodynamic turbulence when the cleaning liquid is deposited on the optic 4. The flap 32 can also ensure the back diffusion of the cleaning liquid towards the center of the optic 4, thus allowing the cleaning liquid deposited only by gravity.
    According to a variant, the flap 32 can be configured to come to be placed in front of the optics 4 when the vehicle is parked so that the dirt cannot come to settle on it and thus limit its fouling.
    According to the particular embodiment of FIG. 9A, the flap 32 can be integrated or hidden in the bodywork element 22.
    According to a particular embodiment not shown here, the flap 32 can be made of an optically transparent material so that the optical sensor 3 remains partially operational during the cleaning of its optics 4.
    According to the particular embodiment of FIG. 4, the projection element 7 comprises a nozzle 13 for projection of a compressed air flow which makes it possible to project either a blade of compressed air on the optics 4 in order to remove dirt, either spray a stream of compressed air on this lens 4 to dry it and possibly spread the cleaning liquid on this lens 4 to form a protective layer to limit the possibility of adhesion dirt on this lens 4.
    According to the illustrated embodiment, the projection nozzle 13 is installed at the end of the wall 31, aligned with the fingers 34, and is distinct from this wall 31. According to a variant not shown here, the wall 31 may include the projection nozzle 13.
    According to a variant not shown here, the wall 31 may comprise the nozzle 5 for dispensing cleaning liquid.
    According to the embodiment of FIGS. 1 to 3 and 10, the projection element 7 comprises an air inlet 11 configured to supply the projection nozzle 13 carried by the confinement wall 7 with compressed air, thus allowing the nozzle projection 13 to project a compressed air flow on the optics 4. With reference to FIGS. 1 and 4, the air inlet 11 is connected to a compressor 15 for example which makes it possible to generate the compressed air. The compressed air is then brought to the projection nozzle by passing through channels 37, visible in FIG. 4, which extend on either side of the wall 31 between the air inlets 11 and the projection nozzle 13.
    With reference to FIG. 6, when the projection element 7 is in the first cleaning position, the projection nozzle 13 can project a flow of compressed air at the bottom of the optics 4.
    With reference to FIG. 7, when the projection element 7 occupies another cleaning position, which corresponds to an intermediate cleaning position, and follows an upward movement, the projection nozzle 13 can project a blade of compressed air at the optics center level 4.
    Finally, with reference to FIG. 8, when the projection element 7 occupies a final cleaning position, and more precisely an extreme position as is also represented with reference to FIG. 2. In the configuration of FIG. 8, the projection nozzle 13 can project a blade of compressed air at the top of the lens 4.
    Thus, the projection nozzle 13 can project a blade of compressed air onto all of the optics 4 by virtue of the movement of the projection element 7 and thus make it possible to take off the various soils which may have become encrusted on the optic 4. The projection of compressed air onto optic 4 is carried out according to the particular embodiment of FIGS. 6 to 8 after the deposition of at least one drop of cleaning liquid on this optic 4. The deposition of this drop of cleaning liquid can be produced when the projection element 7 is as much in its first cleaning position (FIG. 6) as in its extreme position (FIG. 8).
    Advantageously, the projection nozzle 13 has a projection orifice which may have a shape of blade shaped to match in the transverse direction the shape of the optics 4 of the optical sensor 3.
    The projection nozzle 13 can be configured to modulate the projection pressure of the compressed air flow on the optical sensor 3.
    According to the particular embodiment of Figures 2, 3, 6 to 8, and 10, the projection element 7 has arms 9 in the form of an arc of a circle. According to the embodiment shown, each arm 9 has an air inlet 11 in order to supply the projection nozzle 13 with compressed air to be projected onto the optics 4 of the optical sensor 3. With reference to FIG. 4, the compressed air supply channels 37 can be arranged inside the arms 9.
    More precisely, according to the particular embodiment of FIGS. 3, 4, and 10, the projection element 7 has two arms 9 arranged on either side of the wall 31.
    According to the particular embodiment shown in particular in Figures 3 and 4, the arms 9 are connected to the projection nozzle 13 in order to allow this projection nozzle 13 to move vertically relative to the optic 4, and preferably on the entire height of this lens 4.
    Furthermore, in order to set the projection element 7 in motion, the cleaning device 1 advantageously includes a drive mechanism 21, 23.
    By way of nonlimiting example and with reference to FIGS. 3 and 10, the drive mechanism may include an element disposed inside the body element 22 which cooperates with an element carried by the projection element 7 In this example, the drive mechanism comprises an actuator 21 disposed inside the body element 22 and a coupling system 23 carried by one of the two arms 9 of the projection element 7. The arms 9 allow the wall 31 to be connected to the coupling system 23 so as to allow the projection element 7 to rotate. More specifically, the arms 9 make it possible to transmit the rotational movement of the drive mechanism to the wall 31 so that the projection element 7 can move from its retracted position to one of its different cleaning positions and vice versa.
    According to the particular embodiment shown in Figures 6 to 8 and 10, the arms 9 each have a stop 33 configured to bear against the body element 22 in which the cleaning device 1 is installed when the projection element 7 is at the end of its upward movement (FIG. 10), that is to say when the projection nozzle 13 projects a flow of compressed air at the level of the upper part of the optic 4. Once the stop 33 has come into contact with the body element 22, the actuator 21 is configured to stop its rotation or to turn in the opposite direction in order to return the projection element 7 to its retracted position. According to the particular embodiment of Figures 3 and 4, the coupling system 23 has a drive roller 24 on its outer surface. The presence of this drive roller 24 ensures the cooperation of the coupling system 23 and the actuator 21.
    According to another embodiment not shown here, the coupling system 23 and the actuator 21 each have a gear type structure complementary to each other which allow these two elements to cooperate together.
    According to another embodiment not shown here, the coupling system 23 and the actuator 21 cooperate using a belt.
    According to yet another embodiment not shown here, the cooperation of the coupling system 23 and of the actuator 21 is ensured using a system with pinion and rack.
    According to another variant not shown, the actuator 21 can drive the projection element 7 without an intermediate coupling system 8.
    According to another variant not shown, the projection element 7 can be set in motion with the compressor 15 which projects compressed air with sufficient pressure to allow the displacement of this projection element 7 at the same time as it supplies the projection nozzle 13 in compressed air.
    According to a variant of FIG. 1 and optionally, the projection element 7 of the cleaning device 1 can comprise a scraper seal (not shown). This scraper seal can for example be made of rubber or polymer. This scraper seal can contribute to the removal of dirt which may have been deposited on the optical sensor 3 by a mechanical action. Indeed, during the movement of the projection element 7, this scraper seal can rub the optics 4 of the optical sensor 3, which makes it possible to facilitate the elimination of this dirt and therefore to increase the efficiency of the device. cleaning 1.
    Also optionally, the projection element 7 may comprise a discharge pipe, not shown here, for the cleaning liquid connected to a recovery enclosure. According to this variant, the recovery enclosure is in fluid connection with the cleaning liquid reservoir 12 in order to allow the recycling of the cleaning liquid once it has been used to clean the optics 4 of the optical sensor 3. In in such a configuration, the discharge pipe can optionally include a filtration unit in order to purify the recirculating cleaning liquid. According to this particular embodiment, the cleaning device 1 has a recirculation pump (not shown) configured to suck up the cleaning liquid circulating through the filtration unit and thus return it to the cleaning liquid reservoir 12. According to a variant, the metering pump 6 and the recirculation pump can be the same pump.
    Returning to FIG. 1, the driving assistance system 10 comprises at least one electronic control unit 35. The electronic control unit 35 is configured to control the cleaning device 1.
    The electronic control unit 35 can also be configured to control the drive mechanism 21, 23 so as to move the projection element 7 between its retracted position and one of its different cleaning positions.
    The electronic control unit 35 can also be configured to trigger the projection of the compressed air flow on the optics 4 when the projection element 7 is set in motion from its retracted position. The electronic control unit 35 can also be configured to stop the projection of the compressed air flow when the projection element 7 has returned to the retracted position. Advantageously, the electronic control unit 35 can be configured to control the projection pressure of the compressed air flow on the optics 4. Thus, the electronic control unit 35 can control the projection of a blade or a compressed air stream on optics 4 at the projection nozzle 13.
    Furthermore, the electronic control unit 35 can also be configured to control the volume of cleaning liquid aspirated by the metering pump 6. The control of the metering pump 6 makes it possible to draw from the cleaning liquid reservoir 12 and deposit on optic 4 only the volume necessary for cleaning this optic 4, such as for example the volume necessary for depositing a drop on optic 4, which allows the cleaning device 1 to operate more economically than cleaning devices that use cleaning fluid spray systems for example.
    The electronic control unit 35 can also be configured to control the movement of the dispensing nozzle 5 between its rest position and its active position and vice versa.
    The electronic control unit 35 can also be configured to control the movement of the shutter 32 between its inactive position and its position facing the camera when the latter is mounted so that it can rotate on the fingers 34 of the wall 31.
    Optionally, the dispensing nozzle 5 can comprise a heating element controlled by the electronic control unit 35 and configured to heat the cleaning liquid before it is deposited on the optic 4. Defrosting of the optic 4 can be carried out in this way and the optical sensor 3 can maintain good operability whatever the climatic conditions.
    The electronic control unit 35 may also comprise means for detecting dirt in order to control the cleaning of the optics 4 automatically, for example when the means for detecting dirt detect a state of fouling which may harm the quality of the transmitted images and therefore the good operability of the optical sensor 3.
    According to another embodiment not shown, the electronic control unit 35 can be configured to control the cleaning of the optics 4 when the user of the vehicle shifts into reverse, for example when the driving assistance system 10 includes a camera installed on the back of a vehicle for example.
    According to a variant not shown, the electronic control unit 35 can be controlled by the user of the vehicle himself.
    With reference to FIGS. 6 to 12, a more detailed description is given of the method of cleaning the optical sensor 3 using the cleaning device 1 according to the embodiment of FIGS. 1 to 4.
    The method used for cleaning the optical sensor 3 may include a step E1 of activating the dispensing nozzle 5. During this step E1, the metering pump 6 is activated and begins to draw cleaning liquid from the vehicle cleaning fluid reservoir 12.
    Optionally, this step can also allow the displacement of the dispensing nozzle 5 from its rest position to its active position when this dispensing nozzle 5 is movably mounted in the cleaning device 1. As a variant or in addition, this step E1 can also trigger the heating of the dispensing nozzle 5 so as to spray heated cleaning liquid onto the optic 4.
    Next, the method comprises a step E2 of setting in motion the projection element 7 in order to set in motion the projection element 7, in particular according to an upward movement from the retracted position (FIG. 9A) towards at least the first position cleaning (figure 6). The movement can be continuous until the final cleaning position (Figures 8, 9B and 10). Optionally, this step E2 can allow the movement of the flap 32 so that it passes from its inactive position to its position facing the camera when the flap 32 is mounted movable in rotation on the fingers 34.
    The method according to FIG. 11 also comprises a step E3 during which a first drop of cleaning liquid is deposited by gravity on the optics 4 of the optical sensor 3 when the projection element 7 occupies its first cleaning position. During this step E3, the drop of cleaning liquid spreads over the lens 4 and wets the various soils in order to desorb them. In the case where the protective layer left by the adjuvant is already present, the deposition of this first drop of cleaning liquid makes it possible to dissolve this protective layer and thus to eliminate any dirt which may have deposited on it.
    As a variant, step E3 can be implemented when the projection element 7 occupies its high cleaning position, as with reference to FIGS. 2, 9B, and 10.
    The cleaning process comprises a step E4 during which a first flow of compressed air is projected onto the optics 4. More precisely, according to this embodiment and with reference to FIG. 6, the first flow of compressed air corresponds to a blade of compressed air which is projected onto optic 4 in order to remove the dirt present on this optic 4.
    The projection of this compressed air blade can begin as soon as the projection element 7 leaves the retracted position and passes into the first cleaning position. This step can be implemented after a sufficient period of time for the drop of cleaning liquid deposited during step E3 to have had time to run over the entire optics 4 and to moisten the various soils possibly present on optics 4.
    This step E4 lasts for the time necessary for the movement of the projection element 7 so that it passes through its different cleaning positions as shown with reference to FIGS. 6 to 8, so that the blade of compressed air scans the whole of the optics 4 and thus makes it possible to take off the various soils which may have become encrusted on this optics 4.
    As a variant, when the drop of cleaning liquid is deposited on the optic 4 and the projection element 7 is in the high position, step E4 is implemented by moving the projection element 7 from its high position towards its low position.
    At the end of this step E4, the electronic control unit 35 can be configured to evaluate the state of cleanliness of the optical sensor 3 by means of the dirt detection means. If the state of cleanliness of the optics 4 is satisfactory (loop A), the electronic control unit 35 controls in this case the implementation of a step E5 which corresponds to the setting in motion in a downward direction from the projection element 7 for bringing this projection element 7 from the cleaning position in which it is located to its retracted position (FIG. 9A). In this case, the electronic control unit 35 can also control the stopping of the projection of the flow of compressed air to the projection nozzle 13. According to the particular embodiment of Figures 6 to 10, the flap 32 can be used in stopping the operation of the drive mechanism 21, 23 when the projection element 7 has returned to its retracted position. However, if the state of cleanliness is not judged satisfactory by the dirt detection means (loop B), the electronic control unit 35 can repeat the cleaning sequence described above.
    Alternatively, the method may include a preventive treatment cycle following the cleaning cycle.
    Referring to Figure 12, this preventive treatment cycle includes two additional steps E3 ’and E4’ compared to the cleaning cycle (steps E1 to E4) previously described.
    In this case, following the step E4 of projection of the compressed air blade on the optic 4, a second drop of cleaning liquid is deposited on the optic 4 (step E3 '), followed by a drying step E4 ′ of the optics 4 by means of the projection of a second flow of compressed air onto the optics 4. The second flow of air is projected onto the optics 4 with a pressure below that of the first compressed air flow. More precisely, during this drying step E4 ′, the flow of compressed air projected by the projection nozzle 13 on the optic 4 corresponds to a stream of compressed air. The projection of this compressed air stream makes it possible to dry the optic 4. Advantageously, the use of a compressed air stream to dry the optical 4 also makes it possible to spread the cleaning liquid over this optical 4 and possibly thus forming a protective layer to limit the possibilities of adhesion of dirt on this lens 4 if the cleaning liquid has properties making it possible to reduce the adhesion of dirt.
    After these cleaning cycles (steps E1 to E4) and preventive treatment (steps E3 'and E4'), the detection means of the electronic control unit 35 can again assess the state of cleanliness of the optics 4 As before, if the optic 4 has a sufficient state of cleanliness (loop A), the projection element 7 is set in motion by the drive mechanism 21, 23 to reach its retracted position according to step E5. However, if the state of cleanliness is not judged satisfactory (loop B), the electronic control unit 35 commands the implementation of a new cleaning cycle implementing a new cleaning cycle, in particular the steps E3 and E4 of the cleaning cycle, and / or a new preventive treatment cycle (steps E3 'and E4') as described above.
    During step E5, the dispensing nozzle 5 can also return to its rest position when this dispensing nozzle 5 is movably mounted in the cleaning device 1.
    Advantageously, the duration of the cleaning cycle and the preventive treatment cycle is between one and two seconds, which allows the driving assistance system 10 to be rapidly operational when cleaning of the optical sensor 3 is necessary.
    These exemplary embodiments are provided by way of illustration and not limitation. Indeed, it is entirely possible for a person skilled in the art without departing from the scope of the present invention to replace the actuator with any other type of actuator making it possible to move the projection element 7 from its retracted position towards its cleaning position and vice versa. Furthermore, it is entirely possible for a person skilled in the art, without departing from the scope of the present invention, to use a cleaning liquid having a viscosity index lower or higher than that described here. In addition, it is entirely possible for a person skilled in the art without departing from the scope of the present invention to deposit more than one drop of cleaning liquid on the optic 4, such as for example two or three, under form of drip by gravity. Then, it is entirely possible for those skilled in the art to reverse or interchange the steps of the method without departing from the scope of the present invention, and in particular to reverse the step E2 of setting in motion of the projection element 7 towards a cleaning position and the step E3 of projection of a drop of cleaning liquid for example. Furthermore, it is entirely possible for a person skilled in the art, without departing from the scope of the present invention, to use any other type of optically transparent adjuvant making it possible to deposit a semi-soluble protective layer on the optics 4 to prevent fouling and facilitate cleaning of this optic.
    Thus, rapid, efficient and economical cleaning of the optics 4 of an optical sensor 3, such as for example the external lens of a camera, intended to equip a motor vehicle is possible thanks to the cleaning device 1 described here. Advantageously, when the use of cleaning liquid is necessary, the quantities used are generally small, which makes it possible to reduce the operating costs of such a cleaning device 1. In addition, it is not necessary to provide a enlargement of the storage tank for this cleaning liquid with regard to the low consumption offered by the cleaning device 1.
    权利要求:
    Claims (16)
    [1" id="c-fr-0001]
    1. Cleaning device (1) of an optical sensor (3), in particular intended to equip a motor vehicle, comprising a dispensing nozzle (5) of a cleaning liquid, characterized in that the dispensing nozzle (5 ) cleaning liquid is of the drip type and is configured to deposit cleaning liquid by individual drops on the optical sensor (3).
    [2" id="c-fr-0002]
    2. Cleaning device (1) of an optical sensor (3) according to the preceding claim, characterized in that it comprises a support (6) of the dispensing nozzle (5) of the cleaning liquid, said support (6 ) being arranged fixedly relative to the cleaning device (1).
    [3" id="c-fr-0003]
    3. Cleaning device (1) of an optical sensor (3) according to claim 2, characterized in that the dispensing nozzle (5) of the cleaning liquid is movably mounted in the support (6) between:
    a rest position in which the dispensing nozzle (5) is configured to be set back relative to an optic (4) of the optical sensor (3) and
    - an active position in which the dispensing nozzle (5) is configured to be located above the optics (4) of the optical sensor (3), so as to deposit said at least one drop of cleaning liquid on the optics (4) by gravity.
    [4" id="c-fr-0004]
    4. Cleaning device (1) according to any one of the preceding claims, characterized in that the cleaning device (1) comprises a metering pump (8) configured to supply the dispensing nozzle (5) with cleaning liquid so depositing a predefined volume of cleaning liquid drop by drop on the optical sensor (3).
    [5" id="c-fr-0005]
    5. Cleaning device (1) of an optical sensor (3) according to any one of the preceding claims, characterized in that the cleaning device (1) further comprises a projection element (7) movable between:
    a retracted position in which the projection element (7) is configured to be positioned outside the field of vision of the optical sensor (3), and
    - at least one cleaning position in which the projection element (7) is configured to be positioned in front of the optical sensor (3).
    [6" id="c-fr-0006]
    6. Cleaning device (1) of an optical sensor (3) according to the preceding claim, characterized in that the projection element (7) comprises a projection nozzle (13) of a configured compressed air flow for projecting a flow of compressed air onto the optic (4) when the projection element (7) is in a cleaning position.
    [7" id="c-fr-0007]
    7. Cleaning device (1) of an optical sensor (3) according to any one of claims 5 or 6, characterized in that the cleaning device (1) comprises a drive mechanism (21,23) configured for moving the projection element (7) between its retracted position and said at least one cleaning position.
    [8" id="c-fr-0008]
    8. Cleaning device (1) according to any one of claims 5 to 7, characterized in that the projection element (7) is rotatable between its retracted position and said at least one cleaning position.
    [9" id="c-fr-0009]
    9. Driving assistance system (10) comprising at least one cleaning device (1) according to any one of the preceding claims, at least one optical sensor (3), and at least one electronic control unit (35 ) configured to control the cleaning device (1).
    [10" id="c-fr-0010]
    10. Driving assistance system (10) according to claim 9 taken in combination with claim 7, characterized in that the electronic control unit (35) is configured to control the drive mechanism (21, 23 ), so as to move the projection element (7) between its retracted position and said at least one cleaning position.
    [11" id="c-fr-0011]
    11. Driving assistance system (10) according to any one of claims 9 or 10 taken in combination with claim 6, characterized in that the electronic control unit (35) is configured to trigger the projection of the flow of compressed air on the optics (4) when the projection element (7) is in a cleaning position and to stop said projection of the flow of compressed air when the projection element (7) is in position retracted.
    [12" id="c-fr-0012]
    12. Driving assistance system (10) according to claim 11, characterized in that the electronic control unit (35) is configured to control the pressure of projection of the flow of compressed air on the optics (4 ) of the optical sensor (3).
    [13" id="c-fr-0013]
    13. Driving assistance system (10) according to any one of claims 9 to 12 taken in combination with claim 3, characterized in that the electronic control unit (35) is configured to control the volume of cleaning liquid sucked in by the dosing pump (8) and deposited dropwise on the optics (4) of the optical sensor (3).
    [14" id="c-fr-0014]
    14. A method of cleaning an optical sensor (3) of a driving assistance system (10) according to any one of claims 9 to 13 taken in combination with claim 5, characterized in that includes the following steps:
    - setting in motion of the projection element (7) to bring said projection element (7) into at least one cleaning position,
    - depositing at least a first drop of cleaning liquid on the optics (4) of the optical sensor (3), and
    - projection of a first flow of compressed air on the optics (4).
    [15" id="c-fr-0015]
    15. Method for cleaning an optical sensor (3) according to the preceding claim, characterized in that it further comprises the following steps:
    - depositing at least a second drop of cleaning liquid on the optics (4) of the optical sensor (3),
    - projection of a second compressed air flow, said second compressed air flow being projected with a pressure lower than that of the first compressed air flow, on the optics (4) of the optical sensor (3), and
    - setting in motion of the projection element (7) to bring said projection element (7) from said at least one cleaning position to the retracted position.
    [16" id="c-fr-0016]
    16. A cleaning method according to any one of claims 14 or 15, characterized in that the cleaning liquid comprises an adjuvant configured to deposit a protective layer on the optic (4) in order to facilitate cleaning of this optic ( 4).
    3056
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    同族专利:
    公开号 | 公开日
    FR3056528B1|2019-06-21|
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    EP3300970B1|2019-07-10|
    US10682987B2|2020-06-16|
    EP3300970A1|2018-04-04|
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    法律状态:
    2017-09-29| PLFP| Fee payment|Year of fee payment: 2 |
    2018-03-30| PLSC| Publication of the preliminary search report|Effective date: 20180330 |
    2018-09-28| PLFP| Fee payment|Year of fee payment: 3 |
    2019-09-30| PLFP| Fee payment|Year of fee payment: 4 |
    2021-06-11| ST| Notification of lapse|Effective date: 20210506 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1659284A|FR3056528B1|2016-09-29|2016-09-29|OPTICAL SENSOR CLEANING DEVICE, DRIVING ASSISTANCE SYSTEM AND CLEANING METHOD THEREOF|
    FR1659284|2016-09-29|FR1659284A| FR3056528B1|2016-09-29|2016-09-29|OPTICAL SENSOR CLEANING DEVICE, DRIVING ASSISTANCE SYSTEM AND CLEANING METHOD THEREOF|
    EP17183439.3A| EP3300970B1|2016-09-29|2017-07-27|Device for cleaning an optical sensor, and associated driver assistance system and cleaning method|
    US15/718,726| US10682987B2|2016-09-29|2017-09-28|Device for cleaning an optical sensor, and associated driver assistance system and cleaning method|
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