• 专利附录
  • 专利说明
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    • 专利摘要:
    The invention relates to a protection device (3) for an optical sensor (13) for a motor vehicle. According to the invention, the protection device (3) comprises: a transparent optical element (9) mounted rotatably about an axis of rotation (A1), configured to be disposed upstream of an optical element (14) the optical sensor (13) so that its axis of rotation (A1) coincides with the optical axis (15), and - a motor (5) comprising a rotary shaft (51) configured to rotate about an axis of rotation rotation (A2), and configured to rotate said optical element (9) such that the axis of rotation (A1) of said optical element (9) is furthermore coincident with the axis of rotation (A2) of the shaft rotary (51) motor (5). The invention also relates to a corresponding driving assistance system (1) and a cleaning method implementing such a protection device (3).
    公开号:FR3058652A1
    申请号:FR1661121
    申请日:2016-11-17
    公开日:2018-05-18
    发明作者:Giuseppe Grasso；Frederic Bretagnol；Gregory Kolanowski；Marcel Trebouet
    申请人:Valeo Systemes dEssuyage SAS；
    IPC主号:
    专利说明:

    © Publication no .: 3,058,652 (to be used only for reproduction orders)
    ©) National registration number: 16 61121 ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY
    COURBEVOIE © Int Cl 8 : B 08 B 1/02 (2017.01), B 08 B 11/00, B 60 S 1/56
    A1 PATENT APPLICATION
    ©) Date of filing: 17.11.16. © Applicant (s): VALEO WIPING SYSTEMS (30) Priority: Simplified joint stock company - FR. @ Inventor (s): GRASSO GIUSEPPE, BRETAGNOL x ~ x FREDERIC, KOLANOWSKI GREGORY andTREBOUET (43) Date of public availability of the MARCEL. request: 18.05.18 Bulletin 18/20. ©) List of documents cited in the report 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 PROTECTING AN OPTICAL SENSOR, DRIVING ASSISTANCE SYSTEM AND METHOD FOR CLEANING THE SAME.
    FR 3,058,652 - A1 ftv) The invention relates to a protection device (3) for an optical sensor (13) for a motor vehicle.
    According to the invention, the protection device (3) comprises:
    - a transparent optical element (9) mounted mobile in rotation about an axis of rotation (A1), configured to be arranged upstream of an optic (14) of the optical sensor (13) so that its axis of rotation ( A1) is confused with the optical axis (15), and
    - a motor (5) comprising a rotary shaft (51) configured to rotate around an axis of rotation (A2), and configured to rotate said optical element (9) such as the axis of rotation (A1) of said the optical element (9) is also coincident with the axis of rotation (A2) of the rotary shaft (51) of the motor (5).
    The invention also relates to a corresponding driving assistance system (1) and a cleaning method using such a protection device (3).
    -1 Device for protecting an optical sensor, driving assistance system and associated cleaning method
    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 possibly comprising an optical sensor, such as for example a camera comprising a lens. More particularly, the invention relates to a device for protecting such an optical sensor. The invention also relates to a method for cleaning an optical element of such a protection device.
    Currently, front, rear and even side vision cameras are fitted to a large number of motor vehicles. They are notably part of driving assistance systems, such as parking assistance systems, or line crossing detection systems.
    Cameras are known which are installed inside the passenger compartment of a vehicle against the rear window / window by aiming rearwards from the rear window of the vehicle. These cameras are well protected from external climatic hazards and dirt caused by organic or mineral pollutants. However, the angle of view for such cameras, installed inside the passenger compartment, is not optimal, in particular for a parking aid, since they do not make it possible to see the obstacles being in the vicinity of the rear of the vehicle for example.
    For this reason, it is therefore preferable to install the cameras of the driving assistance systems, outside the vehicles in different places according to the desired use, for example at the rear or front bumper, or at the level of the rear or front license plate of the vehicle. In this case, the camera is therefore highly exposed to projections of mineral or organic dirt which can deposit on its optics and thus reduce its efficiency, or even make it inoperative. In particular in rainy weather, projections of rain and dirt can be observed which can greatly affect the operability of the driving assistance system comprising such a camera. The surfaces of the camera optics must be cleaned in order to guarantee their good working order.
    To counteract the deposit of dirt on the camera, it is known to arrange a
    -2 cleaning device of the camera optics, generally a spray of cleaning liquid, close to the latter, to remove the polluting elements which have been deposited over time. However, the use of these nozzles leads to an increase in the operating costs of such a driving assistance system because they require the use of fairly large quantities of cleaning liquid. In addition, the camera lens, which is a relatively fragile element, is not protected from projections which could damage it.
    It is also known to mount the camera inside the external casing of the vehicle, and to protect it from external aggressions by means of a protective window or window fixed to the casing and arranged facing the lens. Although the camera is protected from external aggressions, the protective glass or window remains subject to the deposition of pollutants.
    According to a known solution, means for vibrating the protective glass facing the camera are provided in order to remove the dirt from the protective glass of the camera. However, it has been found that the effectiveness of such a device for stubborn and encrusted soiling can be limited despite the vibration of the protective glass.
    According to another solution, the protection device comprises a housing, in which the camera is arranged, and a rotary cover closing this housing and the axis of rotation of which is eccentric relative to the optical axis of the camera. The protection device also includes a wiper blade.
    However, such a protection device can be noisy if the cover is rotated at high speeds, in particular because of the friction between the cover and the wiper blade. Furthermore, the wiper blade may exhibit premature wear due to the continuous rotation at fairly high speed of the cover. On the other hand, such a protection device can be quite bulky to install, because the rotary cover is eccentric relative to the optical sensor and has a diameter at least twice as large as the diameter of the optics of the optical sensor that it protects. and which it ensures good operability. Then, micro-scratches may appear on the cover if solid particles settle between the wiper and the rotating cover. As a result, the field of vision and the quality of the images taken by the optical sensor may be affected. Finally, the use of such a protection system
    -3does not allow a wide viewing angle, due to the arrangement of the optical sensor inside the box carrying the cover, without protruding from this box.
    The present invention proposes to remedy at least partially the above-mentioned drawbacks by presenting an alternative of a device for protecting an optical sensor making it possible to prevent the deposition of dirt on the optical sensor such as a camera while retaining a wide viewing angle.
    To this end, the invention relates to a device for protecting an optical sensor for a motor vehicle.
    According to the invention, the protection device comprises:
    a transparent optical element mounted to move in rotation about an axis of rotation, said optical element being configured to be arranged upstream of an optical element of the optical sensor so that the axis of rotation of said optical element coincides with the optical axis of the optical sensor, and
    a motor comprising a rotary shaft configured to rotate about an axis of rotation, the motor being configured to drive said optical element in rotation such that the axis of rotation of said optical element is also coincident with the axis of rotation of the rotary shaft of the motor.
    Such a protection device can be installed on an optical sensor intended to be installed inside a bodywork element of the vehicle, or even outside the vehicle, while allowing the optical sensor to maintain a wide angle of vision.
    When it rains or in dry weather, dirt can settle on the optical element. "Soiling" means both water droplets and organic or mineral pollutants. When the housing and the optical element are rotated by the motor, any dirt is ejected by centrifugal effect. Indeed, the work of the centrifugal force thus caused is greater than the adhesion force of dirt on the optical element. The rotation of the optical element therefore allows cleaning of this optical element by centrifugal effect.
    Thus, the optical sensor retains good operability and its fouling is limited whatever the climatic conditions.
    -4 Said optical sensor protection device may also include one or more of the following characteristics, taken separately or in combination:
    the motor is hollow and is configured to receive at least part of the optical sensor;
    said optical element is arranged at the front of the protection device so as to face a road scene the optical sensor of which is configured to participate in taking pictures;
    the motor is arranged on the side opposite to said optical element;
    said optical element is positioned centrally with respect to its axis of rotation; said optical element is formed by a part of the optical sensor; said optical element is distinct from the optical sensor;
    the protection device comprises a housing having a housing configured to receive the optical sensor;
    the housing is integral with the rotary shaft of the motor;
    the housing is defined by a wall of the housing;
    the housing has at least one through hole;
    the protective device comprises a fixing plate and a generally substantially annular bearing arranged between said optical element and the fixing plate;
    said optical element has an internal surface having an anti-fog property, in particular the internal surface of said optical element has an anti-fog coating; said optical element has at least one through hole;
    said optical element has an external surface having at least one property chosen from the following list: infrared, photocatalytic, hydrophobic, super hydrophobic, lipophobic, hydrophilic, super hydrophilic filter, resistance to gravel.
    The invention also relates to a driving assistance system comprising an optical sensor and an optical sensor protection device as defined above.
    According to one aspect of the invention, the driving assistance system further comprises:
    A detection means such as a capacitive sensor configured to detect the approach of an object near said optical element, and
    a means of inhibiting the rotation of said optical element by detecting the approach of an object near said optical element.
    The invention also relates to a method of cleaning an optical element of a device for protecting an optical sensor as defined above, said method comprising at least one step of rotating said optical element to clean said element. optical by centrifugal effect.
    According to one aspect of the invention, said method comprises at least two cleaning steps with a rotational speed of said optical element different for each step.
    Other characteristics and advantages of the invention will appear more clearly on reading the following description, given by way of illustrative and nonlimiting example, and of the appended drawings among which:
    FIG. 1 schematically represents a motor vehicle comprising a driving assistance system according to the invention,
    FIG. 2a is a view in partial longitudinal section of a device for protecting an optical sensor of the assistance system of FIG. 1,
    FIG. 2b is an exploded view of the device for protecting an optical sensor of FIG. 2a,
    FIG. 3 is a front and perspective view of the device for protecting the optical sensor of FIG. 2a,
    FIG. 4 is a rear and perspective view of the device for protecting the optical sensor of FIG. 2a,
    FIG. 5 is a sectional view of an optical element of the protection device, and
    - Figure 6 is a front view of the optical sensor protection device according to a variant with a nozzle for spraying cleaning fluid.
    In these figures, identical elements have the same references.
    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
    -6 apply only to a single embodiment. Simple features of different embodiments can also be combined or interchanged to provide other embodiments.
    In the description, it is possible to index certain elements, such as for example first element or second element. In this case, 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 does not imply an order in time either.
    FIG. 1 shows a motor vehicle 100 equipped with at least one driving assistance system 1 according to the invention.
    The driving assistance system 1 comprises in particular at least one optical sensor 13 and a protection device 3 for the optical sensor 13.
    The optical sensor 13 is for example an optical sensor 13 for taking pictures such as a camera. It can be a CCD sensor (for “charged coupled device” in English ie a charge transfer device) or a CMOS sensor comprising a matrix of miniature photodiodes. According to another variant, it may be a sensor for remote sensing by laser known as a LIDAR sensor, acronym in English for "light detection and ranging".
    As is better visible in FIGS. 2a and 2b, the optical sensor 13 includes an optic 14 with an optical axis 15. The optic 14 is for example a lens. This optic 14 is for example convex (curved) with convexity oriented towards the outside of the optical sensor 13, such as a so-called fish-eye optic.
    In addition, according to the particular example illustrated, the optical sensor 13 can comprise a connecting piece 16, for example of substantially cylindrical shape, disposed around the rear end of the optical sensor 13, in other words on the side opposite to the optics. 14. This connecting piece 16 forms a passage of cables (not shown) necessary for the operation of the optical sensor 13, for example allowing the connection of the optical sensor 13 to a power supply source
    -7from the optical sensor 13 and / or allowing the transmission of images captured by the optical sensor 13 to at least one image processing means (not shown) of the vehicle 100 (FIG. 1).
    According to the illustrated embodiments, the optical sensor 13 is mounted in the protection device 3.
    According to the example illustrated in FIG. 1, the protection device 3 is mounted at the front of the vehicle 100 at the level of a bumper. Of course, as a variant, the protective device 3 can be mounted at the rear of the vehicle 100, for example at the level of the bumper or the license plate. It can also for example be mounted on the sides of the vehicle, for example at the mirrors.
    The protective device 3 can be fixed according to any known technique, to any element 2 of the vehicle 100, such as a bodywork element or an external element such as a bumper, a rear view mirror or a license plate. To this end, there may be mentioned in a non-exhaustive manner a system of clips, a screwing system, or even a bonding system.
    In addition, the protection device 3 comprises an optical element 9, better visible in FIGS. 2a to 3, which is transparent and mounted to move in rotation about an axis of rotation A1. This optical element 9 is configured to be arranged in upstream of the optics 14 of the optical sensor 13 so that the axis of rotation A1 of the optical element 9 coincides with the optical axis 15 of the optical sensor 13.
    The optical element 9 is arranged at the front of the protection device 3. The front of the protection device 3 means the part intended to face the road scene whose optical sensor 13 participates in taking views, when the protection device 3 is mounted on the vehicle 100 (FIG. 1).
    The protective device 3 also comprises a motor 5, visible in FIGS. 2a and 2b, configured to drive the optical element 9 in rotation.
    The motor 5 is arranged at the rear of the protection device 3. The rear of the protection device 3 means the part opposite the front of the protection device 3; the rear of the protective device 3 is therefore the part furthest from
    The road scene whose optical sensor 13 participates in the taking of pictures. In other words, the motor 5 is arranged on the side opposite to the optical element 9.
    The motor 5 is mounted to rotate about an axis of rotation A2. To this end, the motor 5 comprises a rotary shaft 51. In particular, the motor 5 comprises a fixed stator 53 and the rotary shaft or rotor 51 is movable in rotation relative to the fixed stator 53.
    According to the illustrated embodiment, the rotor 51 is arranged around the stator 53. The stator 53 is therefore interior and the rotor 51 exterior.
    In addition, the motor 5 is arranged so that its axis of rotation A2 coincides with the axis of rotation Al of the optical element 9, and with the optical axis 15 of the optical sensor 13.
    By way of nonlimiting example, it may more particularly be a brushless motor, also known by the name "brushless motor" in English.
    The motor 5 can have a rotational speed of between 1000 and 50,000 rpm, preferably between 5,000 and 20,000 rpm, and more preferably between 7,000 and 15,000 rpm. Such rotational speeds allow the elimination of any dirt which may have deposited on the optical element 9 by centrifugal effect and thus make it possible to keep the optics 14 of the optical sensor 13 clean to ensure optimized operation of the assistance system. driving 1.
    The motor 5 is for example electrically powered by a power supply connected to the general electrical circuit of the vehicle 100 (FIG. 1).
    Referring to FIGS. 2a to 4, the protective device 3 may further comprise a housing 4 advantageously secured to the optical element 9 and mounted to move in rotation around the axis of rotation A1 of the optical element 9.
    Preferably, the case 4 is a waterproof case.
    This housing 4 is arranged so as to be driven in rotation by the motor 5, which allows the rotation of the optical element 9. The optical element 9 is therefore in this particular example, configured to be driven in rotation with the housing 4, so as to allow cleaning of the optical element 9 by centrifugal effect.
    The optical element 9 is configured to be placed at the front of the housing 4. The front of the housing 4 is understood to be the part of the housing 4 intended to face the road scene in which the optical sensor 13 participates in the shooting, when the camera
    Protection 9 is mounted on vehicle 100 (FIG. 1). In contrast, the rear of the housing 4, better visible in Figures 2a, 2b, means the part of the housing 4 opposite the front of the housing 4; the rear of the housing 4 is therefore the most distant part of the road scene whose optical sensor 13 participates in the taking of pictures.
    In addition, the housing 4 includes a housing 19 (see FIG. 2a) configured to receive the optical sensor 13 so that the optical axis 15 of the optical sensor 13 is coincident with the axis of rotation A1 of the optical element 9 and the housing 4.
    This housing 19 is also configured to receive the motor 5. More precisely, the motor 5 is arranged at the rear of the housing 4. According to the embodiment described, the motor 5 is arranged on the side opposite to the optical element 9.
    The housing 4 being integral with the optical element 9, this forms a sealed block thus preventing the introduction of dirt inside the housing 4 intended to receive the optical sensor 13 and the motor 5.
    In addition, the motor 5 is in this example arranged in the extension of the optical sensor 13. More precisely, the motor 5 is hollow and is configured to receive at least partially the optical sensor 13. In particular, it is the stator 53 fixed motor which is hollow and can receive part of the optical sensor 13. This is a rear part of the optical sensor 13 on the side opposite to the optics 14.
    In addition, the housing 4 is integral with the rotary shaft or rotor 51 of the motor 5.
    Furthermore, the housing 4 has a wall 21 defining the housing 19 for the optical sensor 13. This wall 21 is centered around the axis of rotation A1 of the optical element 9 and of the housing 4. In this example, the wall 21 is generally substantially cylindrical in shape, as is better visible in FIGS. 2b to 4.
    According to a first variant, the wall 21 can be made in one piece with the optical element 9.
    According to a second variant, the wall 21 and the optical element 9 can be produced by two separate parts, and in this case the wall 21 is secured at one end to the optical element 9. This is in particular the front end of the wall 21 which is secured to the optical element 9. As before, the front is defined as the part closest to the road scene. By way of nonlimiting example, the connection between the wall 21 and the optical element 9 can be done by ultrasonic welding.
    Thus, the housing 4 and the optical element 9 can be made in one or more pieces.
    The housing 41, in particular the wall 21, can be made of any suitable material known to those skilled in the art, for example aluminum or a thermally conductive polycarbonate.
    In addition, the wall 21 advantageously comprises an opening 21a (see FIGS. 2a, 2b) surrounding the connecting piece 16 at the rear of the optical sensor 13, when the optical sensor 13 is arranged inside the housing 4.
    As a variant or in addition, advantageously, at least one means of limiting condensation is provided, hereinafter called anti-condensation means. Such anti-condensation means may be provided at the level of the housing 4. In particular, at least one anti-condensation means may be arranged on the wall 21 of the housing 4.
    By way of nonlimiting example, the anti-condensation means may comprise at least one orifice 210 passing through at the level of the housing 4, in this example on the wall 21 (see FIGS. 2a to 3). The orifice (s) 210 can be made by drilling. Preferably, when several orifices 210 are provided, they are arranged symmetrically with respect to the axis of rotation Al of the housing 4.
    According to the example illustrated in FIG. 2a, two orifices 210 are provided, arranged symmetrically with respect to the axis of rotation A1 of the housing 4. The orifices 210 communicate between the interior of the housing 4 and the exterior of the housing 4 when the protection device 3 is assembled as illustrated in FIG. 2a. By way of nonlimiting example, each orifice 210 may have a diameter of the order of 5mm.
    In addition, one or more semi-permeable membranes 211 can be provided, respectively arranged at least at the level of an orifice 210 (FIGS. 2a to 3). According to the example illustrated in FIG. 2a, two membranes 211 are shown schematically. Each membrane 211 can be fixed to an orifice 210 associated in a sealed manner, for example by gluing or even by ultrasonic welding.
    These membranes 211 are, according to the embodiments described, permeable to air and impermeable to water. The diaphragm (s) 211 thus promote the circulation of air inside the housing 4. This allows good ventilation between the optics 14 and the optical element 9 and thus prevents the accumulation of condensation.
    Advantageously, at least one means of compensating for the mass removed is provided at the orifice 210 or the orifices 210. According to the particular example illustrated in FIGS. 2a to 3, with two orifices 210 symmetrical with respect to the axis of rotation Al of the housing 4 (better visible in FIG. 2a), the two membranes 211 are also placed symmetrically with respect to the axis of rotation Al of the housing 4 and it is this symmetrical arrangement which makes it possible to limit the effects of mass compared to the centrifugal force during the rotation of the case 4.
    As regards more particularly the optical element 9, the latter is intended to protect the optics 14 of the optical sensor 13 from possible projections of dirt or solid debris which could damage this optics 14. It is therefore an element protective device, or more precisely a protective mask for the optical sensor 13, and it is this optical element 9 which is subjected to attacks from the outside, that is to say both water splashes , pollutants, gravel as deposits of pollutants or traces of water.
    This optical element 9 can be made of glass or a transparent plastic material such as polycarbonate.
    The optical element 9 is positioned centrally with respect to the axis of rotation Al. This optical element 9 has in particular a symmetry of revolution with respect to the axis of rotation Al.
    When the protection device 3 is assembled, the optical element 9 is arranged centered relative to the optical sensor 13, more precisely centered relative to the optical element 14.
    As said above, the optical element 9, produced in one piece with the wall 21 of the housing 4 or secured to one end of this wall 21, is arranged at the front of the protection device 3, in this example at front of the housing 4.
    According to a variant, the optical element 9 is distinct from the optical sensor 13. In this case, the optical element 9 is intended to be arranged upstream of the optical sensor 13, more precisely upstream of the optics 14. In the present , the term upstream is defined with respect to the optical axis 15 and with respect to the road scene whose optical sensor 13 participates in the taking of pictures. In other words, by "upstream" of the optic 14 is understood a position in which the optical element 9 is disposed between the optic
    -1214 and the road scene, the optical sensor 13 of which takes part in the shooting, along the optical axis 15.
    According to another variant, the optical element 9 can be formed by a part of the optical sensor 13 such as an outer lens of the optics 14 of the optical sensor 13. In this case, the optical element 9 is also arranged upstream optics 14, that is to say between optics 14 and the road scene whose optical sensor 13 participates in the taking of pictures, along the optical axis 15.
    According to one or other of these variants, the optical element 9 being arranged upstream of the optics 14 of the optical sensor 13, its production in a transparent material makes it possible not to harm the efficiency of the optical sensor 13 .
    In addition, according to one or other of these variants, with reference to FIGS. 1 to 3, when the protection device 3 receiving the optical sensor 13 is mounted on the vehicle 100, the optics 14 and the optical element 9 protrude from an opening provided on the element 2 of the vehicle 100. With such an arrangement, the optical sensor 13 has a large viewing angle V defined schematically by the dashes in FIG. 2a, and the optics 14 remains clean due to the presence of the optical element 9 between the optics 14 and the outside of the vehicle 100 (FIG. 1).
    In addition, according to one or other of the variants of the optical element 9 distinct or belonging to the optical sensor 13, the optical element 9 is dimensioned so as to cover the entire surface of the optics 14 (see FIGS. 2a to 3).
    To this end, by referring again to FIGS. 2a and 2b, when the optical element 9 is separate from the optical sensor 13, the optical element 9 can have:
    a part forming a mask 90a intended to be arranged opposite the optics 14 of the optical sensor 13 and in the extension of this mask 90a, a retaining part 90b intended to come to surround the front part of the optical sensor 13 presenting the optics 14, that is to say the part of the optical sensor 13 intended to face the road scene whose optical sensor 13 participates in the taking of pictures.
    Of course, the holding part 90b is of shape complementary to the shape of the front part of the optical sensor 13 which it is intended to surround. According to the example illustrated, this holding part 90b may have a substantially stepped shape which extends the mask forming part 90a of the optical element 9. This stepped shape of
    The optical element 9 is better visible in FIGS. 2a, 2b and 5. In addition, the holding part 90b of the optical element 9 is the part which is fixed to the front end of the wall 21 of the housing 4 (see FIGS. 2a, 2b), when the optical element 9 is not made in one piece with this wall 21.
    Advantageously, the optical element 9 has a general shape substantially similar to the shape of the optic 14. In this example, the optical element 9 is at least partly of substantially convex shape, with a curve substantially parallel to the curved surface. of the optics 14 of the optical sensor 13. This convex part of the optical element 9 has for example a diameter close to that of the optics 14 of the optical sensor 13. According to the example illustrated, it is the part forming a mask 90a, intended to be arranged directly opposite the optics 14 of the optical sensor 13, which has this substantially convex shape.
    According to an alternative not shown here, the optical element 9, when it is separate from the optical sensor 13, can be at least partially substantially planar.
    Thus, the optic 14 is protected from possible splashes of dirt such as organic or mineral pollutants, water or a combination of these different elements, which can damage it. In addition, during the rotary drive of the housing 4 and of the optical element 9, the centrifugal force which the possible soiling undergoes is greater than the adhesion of this soiling on the optical element 9. Thus, the possible soiling deposited on the external surface of the optical element 9 are ejected from the optical element 9 and do not disturb the field of vision V of the optical sensor 13.
    In addition, in order to avoid a phenomenon of condensation between the optic 14 and the optical element 9, the internal surface 9a of the optical element 9 (see FIG. 5) advantageously has an anti-fog property. The internal surface 9a of the optical element 9 is the surface intended to be arranged opposite the optics 14 of the optical sensor 13. In particular the internal surface 9a of the optical element 9 has an anti-fog coating, shown diagrammatically by a line 23 in an arc with alternating dotted lines and dashes.
    As a variant or in addition, the external surface 9b of the optical element 9 may have one or more of the following properties: hydrophobic, infrared filter, photocatalytic, super hydrophobic, lipophobic, hydrophilic, or even super hydrophilic,
    -14resistance to gravel, or any other surface treatment to reduce the adhesion of dirt.
    In particular, thanks to the hydrophobic properties of the external surface 9b of the optical element 9, any drops of water will flow on the external surface 9b without leaving any traces because water will not be able to adhere to this external surface 9b.
    Thus, the layers or coatings on the external surface 9b the optical element 9, represented schematically by the circular sectors 25 in dashes in FIG. 5, make it possible to limit the possibilities of adhesion of organic or mineral pollutants as well as the presence traces of water on the optical element 9 which can affect the proper functioning of the driving assistance system 1. Advantageously, a liquid solution, such as a Rain-X® type solution, can be deposited, for example periodically and manually, on the external surface 9b of the optical element 9 in order to form a hydrophobic film.
    These exemplary embodiments are provided by way of illustration and not limitation. For example, a person skilled in the art can use a transparent optical element 9 having an external surface 9b having other properties making it possible to limit the adhesion of dirt on this external surface 9b without departing from the scope of the present invention.
    Optionally, the optical element 9 of the protection device 3 can also include an integrated de-icing or demisting system in order to be able to guarantee good operability of the driving assistance system 1 whatever the weather conditions, such as a filament or a defrost resistor for example.
    In addition, by referring again to FIGS. 1 to 4, the optical element 9, and more generally the whole of the protection device 3 can be mounted on the element 2 provided on the vehicle 100 by means of a holding and fixing means, for example comprising a fixing plate 41 and a fixing support 46. After assembly of the protective device 3, the fixing support 46 can be secured to the fixing plate 41 by any suitable means, for example without limitation by welding, screwing or bonding. The fixing plate 41 can for example be fixed by any means to an element 2 such as a body element of the vehicle 100 (Figure 1).
    Referring again to FIGS. 2a to 4, the fixing plate 41 is arranged at the front of the protection device 3. This fixing plate 41 has an opening 45 (FIGS. 2a to 3) for the passage of the optical element 9 and optics 14 of the optical sensor 13, thus allowing vision towards the outside. This opening 45 is for example provided so as to be arranged opposite a complementary opening of the element 2 of the vehicle 100, so that once the holding and fixing means 41, 46 installed on the element 2 of the vehicle 100, the optics 14 of the optical sensor 13 and the optical element 9 protrude from the opening 45 of the fixing plate 41 and the opening present in the element 2 of the vehicle 100 (see FIGS. 1 to
    3) ·
    The fixing support 46 has in this example a substantially "U" shape or a stirrup shape, with two substantially parallel and opposite branches 46a, which extend on either side of the housing 4 and connected by a base 46b. The base 46b is located at the rear of the protection device 3, here on the side opposite to the fixing plate 41.
    The fixing support 46 advantageously includes an opening 47, better visible in FIGS. 2a, 2b and 4, for the passage of the connecting piece 16 at the rear of the optical sensor 13, so as to allow the connection of the optical sensor 13 to the cables (not shown) necessary for the operation of the optical sensor 13. This opening 47 is provided at the rear of the protection device 3, at the level of the base 46b of the fixing support 46 for example substantially in the center.
    Advantageously, a sealed arrangement is provided at the rear of the housing 4 for the passage of cables or wires in order to limit the entry of water vapor and / or other contaminants into the housing 4. In particular, the opening 47 for the passage of the connecting piece 16 allowing the connection of the optical sensor 13 to the cables or wires is tightly protected in order to limit the entry of water vapor and / or other contaminants into the housing 4.
    In addition, the protective device 3 may in particular comprise one or more bearings 27, 28 shown diagrammatically in FIG. 2a. The bearings 27, 28 are generally substantially annular in shape.
    According to the example shown in Figure 2a, the protective device 3
    -16 includes two bearings 27, 28. A first bearing 27, allowing the rotation of the housing 4 relative to the fixing plate 41, is disposed outside of the housing 4, between the optical element 9 and the fixing plate 41 A second bearing 28, allowing the rotation of the housing 4 relative to the fixed stator 53 of the motor, is arranged between the rotor 51 and the stator 53.
    Furthermore, with reference to FIG. 6, in order to improve the state of cleanliness of the optical element 9, according to an optional alternative, the protection device 3 can further comprise at least one nozzle 22 for projecting a fluid, in particular for cleaning and / or drying, on the optical element 9. This nozzle 22 can be located above the optical element 9, for example on the fixing plate 41. According to other embodiments not represented here, the nozzle 22 can be located anywhere near the optical element 9.
    The fluid projected by the nozzle 22 can be compressed air or a cleaning liquid in order to ensure the cleaning of the optical element 9 if the rotation of the latter is not sufficient to remove the various soils that have settled on it. Alternatively, the projection of fluid can be used in addition to the rotation of the optical element 9 in order to ensure an optimized state of cleanliness thereof. In FIG. 6, the arrow 20 illustrates the direction of rotation of the optical element 9, for example clockwise. Of course, this rotation can quite be carried out counterclockwise according to another embodiment not shown here.
    Furthermore, according to other embodiments not shown here, the protection device 3 can comprise several nozzles 22. The protection device 3 can for example comprise a first nozzle 22 configured to spray a first fluid such as cleaning liquid , and a second nozzle configured to project a second fluid such as compressed air, onto the optical element 9.
    The nozzle (s) 22 can be connected to the system for distributing the vehicle cleaning liquid 100 (FIG. 1). As an alternative, the protective device 3 can comprise a reservoir of cleaning liquid which is specific to it. In this case, it is possible to install this driving assistance system 1 relatively easily inside any element 2 of the vehicle 100, such as a bodywork element or on any external element of the vehicle 100, such as for example the front bumpers or
    -17 rear or rear view mirrors, without requiring a long and complex initial design at the vehicle 100 to connect the protection device 3 to the vehicle cleaning liquid system 100 so as to supply the nozzle 22 (FIG. 6).
    Optionally, the protection device 3 can also include elements making it possible to limit any noise pollution from the engine 5 so as not to inconvenience the occupants inside the vehicle 100 or other users when using the device. protection 3 due to the high rotation speeds of the motor 5.
    Furthermore, the protection device 3 as described above with reference to all of the figures, can be implemented according to a method of cleaning the optical element 9 of such a protection device 3. The cleaning method aims in particular to eliminate, by centrifugal effect, any deposits on the optical element 9, in particular on the mask portion 90a of the optical element 9, during the rotation of the optical element 9. Of course, in order to to be able to clean by centrifugal effect, the optical element 9 is rotated, for example by means of the housing 4, at a non-zero speed of rotation
    To this end, with reference to FIGS. 1 to 2b, the driving assistance system 1 may further comprise an electronic control unit, not shown here, in particular configured to activate the motor 5 in order to rotate the optical element 9, for example through the housing 4.
    According to an exemplary embodiment of the cleaning process, the motor 5 can be activated, for example, by the electronic control unit, so that the housing 4 and the optical element 9 are rotated permanently during the operation of the vehicle 100, that is to say during the driving phases or when stopped with the contact.
    According to another embodiment of the cleaning method, the motor 5 can be activated, for example by the electronic control unit, in order to rotate the housing 4 and the optical element 9 intermittently during the operation of the vehicle 100. According to this embodiment, the electronic control unit can, by
    For example, controlling the starting of the engine 5 when the user of the vehicle uses a functionality of the vehicle requiring the implementation of the optical sensor 13, such as for example when shifting into reverse when the assistance system for the pipe 1 is installed to allow a view to the rear of the vehicle so as to facilitate parking thereof.
    Advantageously, the speed of rotation of the optical element 9 can be adapted during the cleaning process. For example, the electronic control unit is configured to control the motor 5 in order to adapt the speed of rotation according to the speed of movement of the vehicle 100. In fact, the dirt is removed from the optical element 9 by means of the action of the centrifugal force linked to the rotation of the housing 4 and of the optical element 9, and possibly combined with the friction linked to the movement of the vehicle 100, in particular when the driving assistance system 1 is at the front of the vehicle 100. Thus, the higher the speed of movement of the vehicle 100, the less the speed of rotation of the housing 4 and of the optical element 9 needs to be high to maintain a good state of cleanliness of the optical element 9 and therefore an optimized operation of the optical sensor 13. Thus, the electronic control unit can be configured to act on the motor 5 so that it decreases the speed of rotation of the housing. er 4 when the speed of the vehicle 100 increases, in particular when the optical element 9 is installed at the front of the vehicle.
    According to a particular embodiment, the electronic control unit is configured to induce a change in the direction of rotation of the optical element 9. Advantageously, the electronic control unit can modify the direction of rotation of the optical element 9 repeatedly over a predefined, relatively quick period of time. This modification of the direction of rotation promotes the appearance of acceleration phenomena and makes it possible to effectively eliminate any small drops of water which would be found substantially in the center of the optical element 9 for example. Indeed, the variation of the direction of rotation of the optical element 9 will subject the dirt to an acceleration in the opposite direction to their displacement which will facilitate their loss of adhesion on the optical element 9 is therefore their ejection from that -this.
    The cleaning process can also include at least one step of projecting at least one fluid onto the optical element 13. This projecting step can be triggered for example after detection of dirt in the field of vision V of the
    -19 optical sensor 13, and / or according to the speed of the vehicle 100 and / or according to a time delay.
    For example, the electronic control unit can also be configured to trigger the projection of at least one fluid, such as for example compressed air or cleaning liquid, onto the optical element 9 using the nozzle 22 when the optical sensor 13 detects the presence of dirt in its field of vision V for example.
    According to a particular embodiment, the electronic control unit can be configured to trigger the projection of compressed air on the optical element 9 when the vehicle 100 is stopped or when it is moving at low speed, that is to say for example at a speed lower than 15 km / h. In fact, in such a case, the aerodynamic forces may not be sufficient to be effectively coupled to the centrifugal force of the rotation of the housing 4 and of the optical element 9 in order to eliminate the drops of water and / or dirt that may be deposited on the optical element 9. In particular, at low speed or when the vehicle is stationary, the small drops of water located in the center or near the center of the optical element 9 may be difficult to remove because the speed of rotation of the center of the optical element 9 may be too low to eject them. Advantageously, the projection of compressed air onto the optical element 9 can make it possible to compensate for the absence of aerodynamic forces when the vehicle 100 is moving at low speed or when it is stationary.
    According to another embodiment, the electronic control unit can be configured to trigger the spraying of cleaning liquid and / or compressed air after a certain running time of the vehicle 100.
    According to yet another embodiment, the electronic control unit can be configured to trigger the spraying of cleaning liquid and / or compressed air on command of the vehicle user.
    The cleaning process can also include consecutive spraying steps of different fluids. The electronic control unit can be configured, according to certain embodiments, to trigger the spraying of cleaning liquid and compressed air consecutively.
    According to a particular embodiment of the cleaning method, when the optical sensor 13 detects the presence of dirt in its field of vision V despite
    -20 the centrifugal effect, the control unit can control the stopping of the motor 5 in order to stop the rotation of the housing 4 and of the optical element 9. The electronic control unit can then control the projection of liquid from cleaning by the nozzle 22 so as to remove the dirt for example. The electronic control unit can then control the projection of compressed air by this same nozzle 22 or by a second nozzle not shown here in order to remove the dirt which would have become encrusted on the optical element 9. The electronic unit of control can then reactivate the motor 5 to again rotate the housing 4 and the optical element 9 at a different speed of rotation than the initial speed of rotation. The projection of compressed air can be carried out before, simultaneously, or even after the resumption of the rotation of the housing 4 and of the optical element 9 according to this embodiment.
    As a variant or in addition, the cleaning process may include at least two cleaning steps, each with a different speed of rotation of the optical element 9. By way of nonlimiting example, one can provide:
    a first step of spraying cleaning fluid onto the optical element 9, in particular onto the mask part 90a, during which the optical element 9 is rotated according to a first speed of rotation, and
    - a second drying step, during which the optical element 9 is rotated according to a second speed of rotation different from the first speed of rotation.
    In this example, the first speed of rotation is advantageously lower than the second speed of rotation.
    The triggering of the second drying step can be delayed.
    Thus, in particular, when a fluid such as cleaning liquid is sprayed or applied on the optical element 9, the speed of rotation can be relatively low, or even slowed down if the optical element 9 was already rotated. This makes it easier to spread the cleaning liquid. After a predefined period of time, for example relatively short to correspond to the time necessary to spread the cleaning liquid, the speed of rotation is accelerated, making it possible to dry the external surface 9b (see FIG. 5) of the optical element 9 , in particular of the mask forming part 90a, and also of promoting the elimination of soiling wetted by the cleaning liquid.
    Advantageously, with such an embodiment, the amount of fluid for cleaning is much lower than a conventional cleaning system of the prior art without rotation.
    Furthermore, the protection device 3 can further and optionally comprise a detection means (not shown) configured to detect the approach of an object near the optical element 9. Advantageously, the protection device 3 comprises a proximity sensor, not shown here, connected to the electronic control unit. Such a proximity sensor can for example be a capacitive proximity sensor.
    The driving assistance system 1 can comprise a means of inhibiting (not shown) the rotation of the housing 4 and the optical element 9 by detecting the approach of an object near the optical element 9. By way of example, the capacitive proximity sensor can be configured to transmit information for detecting the approach of an object to the electronic control unit, and the latter can include one or more processing means for receive this information and control the automatic shutdown of the motor 5 in order to stop the rotation of the housing 4 and of the optical element 9. Thus, the risk is reduced that the optical element 9 is damaged if it is in contact with an object due to its rotation, in particular when the driving assistance system 1 is intended to be installed at the level of the front or rear bumpers of the vehicle 100.
    Thus, a field of vision V is obtained for the optical sensor 13 which is always clear and clean. Indeed, in operation, the motor 5 rotates the optical element 9, relative to the optical sensor 13, for example via the housing 4. This rotation is possible in particular thanks to the arrangement of a part of the optical sensor 13 in the fixed stator 53 of the motor 5 and at the connection between the rotary shaft 51 of the motor 5 to the optical element 9 for example via the housing 4. The rotation of the optical element 9 ensures the elimination of soiling due to the centrifugal force which they undergo.
    In addition, the fact that the axis of rotation A1 of the optical element 9 is coincident with the optical axis 15 of the optical sensor 13 makes it possible to adapt this system to any type of
    -22 optical sensor 13 intended to be integrated into a vehicle 100, while retaining a wide viewing angle.
    权利要求:
    Claims (15)
    [1" id="c-fr-0001]
    1. Protection device (3) of an optical sensor (13) for a motor vehicle (100), characterized in that the protection device (3) comprises:
    - a transparent optical element (9) mounted mobile in rotation about an axis of rotation (Al), said optical element (9) being configured to be arranged upstream of an optical element (14) of the optical sensor (13) of so that the axis of rotation (A1) of said optical element (9) coincides with the optical axis (15) of the optical sensor (13), and
    - a motor (5) comprising a rotary shaft (51) configured to rotate around an axis of rotation (A2), the motor (5) being configured to rotate said optical element (9) such as the axis of rotation (A1) of said optical element (9) is also coincident with the axis of rotation (A2) of the rotary shaft (51) of the motor (5).
    [2" id="c-fr-0002]
    2. Protection device (3) according to the preceding claim, wherein the motor (5) is hollow and is configured to receive at least partially the optical sensor (13).
    [3" id="c-fr-0003]
    3. Protective device (3) according to any one of the preceding claims, in which said optical element (9) is arranged in front of the protective device (3) so as to face a road scene the optical sensor (13) is configured to participate in the taking of pictures.
    [4" id="c-fr-0004]
    4. Protective device (3) according to any one of the preceding claims, in which the motor (5) is arranged on the side opposite to said optical element (9).
    [5" id="c-fr-0005]
    5. Protective device (3) according to any one of the preceding claims, in which said optical element (9) is positioned centrally with respect to its axis of rotation (Al).
    [6" id="c-fr-0006]
    6. Protective device (3) according to any one of claims 1 to 5, wherein said optical element (9) is formed by a part of the optical sensor (13).
    [7" id="c-fr-0007]
    7. Protection device (3) according to any one of claims 1 to 5, wherein said optical element (9) is separate from the optical sensor (13).
    [8" id="c-fr-0008]
    8. Protection device (3) according to any one of the preceding claims,
    -24 comprising a housing (4) having a housing (19) configured to receive the optical sensor (13).
    [9" id="c-fr-0009]
    9. Protective device (3) according to the preceding claim, wherein the housing (4) is integral with the rotary shaft (51) of the motor (5).
    [10" id="c-fr-0010]
    10. Protective device (3) according to one of claims 8 or 9, wherein the housing (19) is defined by a wall (21) of the housing (4).
    [11" id="c-fr-0011]
    11. Protective device (3) according to any one of the preceding claims, comprising a fixing plate (41) and a bearing (27) of generally annular shape disposed between said optical element (9) and the fixing plate ( 41).
    [12" id="c-fr-0012]
    12. Protection device (3) according to any one of the preceding claims, in which said optical element (9) has an internal surface (9a) having an anti-fogging property, in particular the internal surface (9a) of said optical element (9 ) has an anti-fog coating (23).
    [13" id="c-fr-0013]
    13. Protection device (3) according to any one of the preceding claims, in which said optical element (9) has an external surface (9b) having at least one property chosen from the following list: infrared, photocatalytic filter, hydrophobic, super hydrophobic, lipophobic, hydrophilic, super hydrophilic, resistance to gravel.
    [14" id="c-fr-0014]
    14. Driving assistance system (1) comprising an optical sensor (13) characterized in that it further comprises a protection device (3) of the optical sensor (13) according to any one of the preceding claims.
    [15" id="c-fr-0015]
    15. A method of cleaning an optical element (9) of a protection device (3; 103) according to any one of claims 1 to 13, said method comprising at least one step of driving said optical element in rotation. (9) for cleaning said optical element (9) by centrifugal effect, in particular at least two cleaning steps with a rotational speed of said optical element (9) different for each step.
    1/3
    A2 Λ
    V
    46b
    3/3
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    同族专利:
    公开号 | 公开日
    JP2019537538A|2019-12-26|
    US10843668B2|2020-11-24|
    WO2018091641A1|2018-05-24|
    CN110167688A|2019-08-23|
    EP3541538A1|2019-09-25|
    FR3058652B1|2021-10-15|
    US20190329737A1|2019-10-31|
    JP6780110B2|2020-11-04|
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    法律状态:
    2017-11-30| PLFP| Fee payment|Year of fee payment: 2 |
    2018-05-18| PLSC| Publication of the preliminary search report|Effective date: 20180518 |
    2019-11-29| PLFP| Fee payment|Year of fee payment: 4 |
    2020-11-30| PLFP| Fee payment|Year of fee payment: 5 |
    2021-11-30| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1661121A|FR3058652B1|2016-11-17|2016-11-17|PROTECTION DEVICE FOR AN OPTICAL SENSOR, DRIVING ASSISTANCE SYSTEM AND ASSOCIATED CLEANING PROCEDURE|
    FR1661121|2016-11-17|FR1661121A| FR3058652B1|2016-11-17|2016-11-17|PROTECTION DEVICE FOR AN OPTICAL SENSOR, DRIVING ASSISTANCE SYSTEM AND ASSOCIATED CLEANING PROCEDURE|
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    US16/461,907| US10843668B2|2016-11-17|2017-11-17|Device for protecting an optical sensor, and associated driver assistance system and cleaning method|
    EP17798242.8A| EP3541538A1|2016-11-17|2017-11-17|Device for protecting an optical sensor, and associated driver assistance system and cleaning method|
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