• 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 invention relates to a device for protecting an optical sensor, comprising: at least one air jet nozzle in front of the optical sensor, the projection nozzle being disposed on one side of the optical sensor and connected to a discharge pump; air via a discharge line so that the air projected by the air jet nozzle is flush with the optical sensor, - at least one suction line disposed on the opposite side of the projection nozzle with respect to the optical sensor . The suction line is connected to the discharge line of the pump, downstream of the pump so that suction in the suction line is performed by a venturi effect.
    公开号:FR3026031A1
    申请号:FR1458968
    申请日:2014-09-23
    公开日:2016-03-25
    发明作者:Marcel Trebouet；Frederic Giraud
    申请人:Valeo Systemes dEssuyage SAS；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD The present invention relates to a device for protecting an optical sensor. Nowadays, rear vision cameras are used in a large number of motor vehicles, and in particular they are part of a parking assistance system that makes it easier to park in a location without turning around and to detect obstacles. located behind the vehicle. Cameras are known which are installed inside the cockpit against the rear window / bezel looking towards the rear from the rear window of the vehicle. These cameras are well protected from external climatic influences and can for example benefit from the defrosting and cleaning systems of the rear window, for example a heating wire integrated in the glass of the rear window. However, the angle of view is not optimal, especially for parking assistance and for this reason, it is preferred that the camera is arranged at the rear bumper or the rear registration plate of the 20 vehicle. In this case, the camera is highly exposed to the projections of dirt that can be deposited on its optics and thus reduce its effectiveness, or even make it inoperative. Especially in rainy weather, there are projections of rain and dirt which can greatly affect the operability of the vision system. To counteract the deposition of dirt on the camera, it is known to arrange a device for cleaning the optics of the camera, usually a nozzle of cleaning fluid, close to it, to remove the polluting elements that are deposited over time. However, the optics of the camera, which is a relatively fragile element, is not protected from projections that may damage it.
    [0002] VVFR2162 2 It is also known to mount the camera inside the outer skin of the vehicle, and to protect it from external aggressions through a protective glass attached to the cladding. Although the camera is protected from external aggression, the camera remains subject to the deposition of pollutants inside the vehicle skin, and the cleaning of the camera is particularly difficult in such an arrangement. It is known from document WO2005039934 in the name of the applicant mounting a rear view camera in a protective housing having a viewing window. This assembly further comprises a device for spraying a cleaning liquid on the viewing pane. Thus, the camera is well protected while allowing to ensure an optimal vision after a cleaning. However, this arrangement is too cumbersome and cameras currently available on the market are waterproof so that it is preferred to mount directly on a body part at the bumper or the license plate. A new concept appeared since does not tend to clean the camera as soon as it is dirty to maintain its operability, but to keep it clean permanently against the projections of rain or dust. For this purpose, it is known to continuously project an air curtain in front of the screen camera which prevents the deposition of dirt. However, to allow a very wide vision of the rear camera, it is equipped with a wide-angle lens with a convex lens very curved also known as fish-eye or "fish-eye" in English. The distortion of the image is then done in computer form so that the user can see on a screen a flattened image. This convex optics of the fish eye results, when it is swept by an air curtain substantially perpendicular to the optical axis, that the part proximal to the air jet nozzle is well cleaned, but the distal part, although protected by the air curtain, forms an area that is difficult to dry or defrost by the air curtain.
    [0003] VVFR2162 3 To overcome this problem, JP 2012-201122 discloses a camera which has a nozzle for blowing compressed air onto the lens surface from a portion of the outer circumference of the convex lens.
    [0004] In addition, the camera housing has a branched flow passage provided at a position below the convex lens in the downstream direction of the compressed air which allows a small portion of the projected air curtain to be returned to the distal part of the lens. However, in view of the size of this passage and the pressure drop that it constitutes, this provision is not very effective, especially when the vehicle is traveling for example at 90km / h and the air curtain is attracted by aerodynamic phenomena around the vehicle towards the rear of it. Another solution that seems more effective is known from W003104052, including that illustrated in Figure 3 of this document. In this case, a compressed air pump is installed near the camera. An outlet of this pump is connected to an air jet nozzle on one side of the camera lens and a suction pipe which is connected via a pump protection filter is placed on the side the lens of the camera opposite the projection nozzle.
    [0005] This assembly is complex and expensive. Indeed, it requires the installation of a filter in the suction line to protect the pump, which filter must be changed at regular intervals to maintain the operability of the device. Indeed, once the filter clogged, the pump runs empty and the projected air flow is reduced or zero.
    [0006] In addition, because the pump must be connected to both the spray nozzle and the suction pipe, the pump and filter must be installed close to the camera, which is generally difficult because of the lack of place available at the bumper or at the number plate.
    [0007] Finally, in rainy weather, closed-loop recirculated air is very humid and fogging may be deposited on the camera lens. No drying VVFR2162 4 can be achieved. This can not be countered by having an expensive dehumidifier in the suction or discharge lines. The present invention proposes to remedy at least partially the disadvantages mentioned above by having an optical sensor protection device that is easy to install, inexpensive, and whose maintenance can be reduced. For this purpose, the subject of the invention is a device for protecting an optical sensor comprising: at least one air jet nozzle in front of the optical sensor, the projection nozzle being disposed on one side of the optical sensor and connected to it to an air discharge pump via a discharge line so that the air projected by the air jet nozzle is flush with the optical sensor, - at least one suction line disposed on the opposite side of the air jet nozzle. projection with respect to the optical sensor, characterized in that the suction line is connected to the discharge line of the pump, downstream of the pump so that the suction in the suction line is carried out by a venturi effect . Thus, the air curtain is efficiently conducted around the optical sensor protecting it. The pump can be installed even far from the camera since the suction line works on the principle of a venturi effect. No maintenance should be provided for this suction pipe, in particular, it is not necessary to install a filter. In addition, the device according to the invention is less expensive than the solutions of the state of the art. The protective device according to the invention may furthermore comprise one or more of the following characteristics taken alone or in combination: The suction pipe may be connected to the discharge pipe so that the direction of flow in the discharge pipe and the direction of flow in the suction line is less than or equal to 90 °.
    [0008] VVFR2162 In one aspect, the device comprises a venturi ejector at the connection of the suction line to the discharge line. The venturi ejector has for example a throat diameter smaller than the diameter of the discharge pipe. The diameter of the strangely can be between 0.1 and 0.9 times the diameter of the discharge pipe. In yet another aspect, the diameter of the suction pipe is smaller than the diameter of the discharge pipe and the diameter of the suction pipe is in particular between 0.1 and 0.9 times the diameter of the discharge pipe. It is expected that the device may comprise a heating element disposed between the pump and the connection between the discharge line and the suction line. The air flow at the outlet of the projection nozzle is for example a laminar air flow. In yet another aspect, the air discharge pump comprises an air intake inside the passenger compartment of a motor vehicle.
    [0009] The suction pipe may include an opening in the lower part to mainly evacuate water residues that can stagnate. The invention also relates to a rear vision system for a motor vehicle comprising an optical sensor and a device as defined above.
    [0010] Other advantages and characteristics will become apparent on reading the description of the invention, as well as the appended drawings in which: FIG. 1 is a schematic view of a first embodiment of the device according to the invention; Figure 2 is a schematic view of a second embodiment of the device according to the invention. VVFR2162 6 - Figure 3 is a schematic view of a third embodiment of the device according to the invention. In these figures, the identical elements bear the same reference numbers. FIG. 1 shows a rear view system 1 for a motor vehicle comprising an optical sensor 3 and a protection device 5 for this sensor 3. The optical sensor 3 is for example a camera intended to be mounted at the rear of a vehicle. motor vehicle, for example at a bumper or a license plate (not shown). The optical sensor 3 comprises for example a convex optics 7 (convex) such as a fish-eye optics ("fish-eye" in English). As seen in FIG. 1, the protection device 5 comprises at least one air jet nozzle 9 arranged in front of the optical sensor 3. In FIG. 1, the air flow is directed in a substantially perpendicular direction relative to the optical axis 11 of the optical sensor 3. In the present example, the flow of air is directed from the top to the bottom towards the ground (not shown), but according to a variant, a flow of air directed from right to left or vice versa is also possible. The projection nozzle 9 is thus disposed on one side of the optical sensor 3 so that the projected air is flush with the optical sensor 3, in particular its convex optic 7. The projection nozzle 9 is supplied with air by a discharge pump 13 and is connected to an air outlet thereof via a discharge pipe 15. The discharge pump 13 is for example formed in the form of an air blower, particularly in the form of an air blower. roller or propeller, or a compressor. In the context of a heavy goods vehicle, the pump may be the compressed air compressor of the vehicle for the braking system with its compressed air reservoir.
    [0011] The protective device 5 further comprises at least one suction line 17 which is disposed on the opposite side of the projection nozzle 9 with respect to the optical sensor 3. As can be seen in the figure, the line of suction 17 is connected to the discharge line 15 of the pump 13, downstream thereof so that the suction in the suction pipe 17 is made by a venturi effect. It can therefore be seen that part of the air that has been thrown by the nozzle 9 is sucked by the suction pipe 17 so that a kind of protective screen is formed by the airflow around the nozzle. convex optics 7 of the sensor 3.
    [0012] In that the suction in the pipe 17 is made by a venturi effect, this pipe 17 can be quite short and be connected to the discharge pipe 15 near the optical sensor 3. As the pipe 17 operates on the basis of the venturi effect, no special maintenance is necessary and the discharge pump 13 can be arranged further, for example inside the passenger compartment. For this purpose, the air discharge pump has an air intake 19 inside the passenger compartment of a motor vehicle. Thus, the air blown towards the optical sensor is already filtered and conditioned in particular temperature and humidity by the air conditioning system of the vehicle.
    [0013] To form a kind of air curtain screen against dirt, the air flow at the outlet of the spray nozzle 9 is a laminar air flow. Concerning the connection of the suction duct 17 to the discharge duct 15, the direction of flow in the discharge duct 15 and the direction of flow in the suction duct 17 make an angle α of less than or equal to 90 °. Furthermore, the diameter of the suction pipe 17 is smaller than the diameter of the discharge pipe 15, in particular the diameter of the suction pipe 17 is between 0.1 and 0.9 times the diameter of the discharge pipe 15.
    [0014] As can be seen in FIG. 1, the suction pipe 17 has an opening 20 arranged preferably at the bottom of the suction pipe VVFR2162 8. This opening 20 is intended to prevent water or dirt stagnate in the suction pipe 17 and therefore obstruct it. FIG. 2 shows another embodiment which differs from that of FIG. 1 in that the device comprises a venturi ejector 23 at the connection of the suction pipe 17 to the discharge pipe 15. L ejector venturi effect 23 has a throat 25 of diameter smaller than the diameter of the discharge pipe 15 for example between 0.1 and 0.9 times the diameter of the discharge pipe 15.
    [0015] This has the effect of strengthening the suction and makes the device more efficient. FIG. 3 shows yet another embodiment that differs from that of FIG. 1 in that the device comprises a heating element 29 placed between the pump 13 and the connection between the discharge pipe 15 and the suction pipe. 17. The heating element 29 may be for example an electric heating resistor, or a PTC component (for example ceramic or plastic). This embodiment is particularly advantageous for performing defrosting or quick drying of the convex optic 7 of the sensor 3.
    [0016] It is therefore understood that the protection device 5 according to the invention makes it possible to simplify an effective protection air screen around the optical sensor 3. Of course, other variants are possible that are outside the scope of the present invention. Thus, it is possible, for example, to combine the embodiments of FIG. 2 and FIG.
    权利要求:
    Claims (12)
    [0001]
    REVENDICATIONS1. Protective device (5) for an optical sensor (3) comprising: - at least one air jet nozzle (9) in front of the optical sensor (3), the projection nozzle (9) being arranged on one side of the optical sensor (3) and connected to an air discharge pump (13) via a discharge line (15) so that the air projected by the air jet nozzle (9) is flush with the optical sensor (3). ), - at least one suction line (17) disposed on the opposite side of the spray nozzle (9) with respect to the optical sensor (3), characterized in that the suction line (17) is connected to the discharge line (15) of the pump (13), downstream of the pump (13) so that the suction in the suction pipe (17) is carried out by a venturi effect.
    [0002]
    Device according to claim 1, characterized in that the suction line (17) is connected to the discharge line (15) so that the flow direction in the discharge line (15) and the flow direction in the suction line (17) make an angle less than or equal to 90 °.
    [0003]
    3. Device according to claim 1 or 2, characterized in that it comprises a venturi ejector (23) at the connection of the suction line (17) to the discharge line (15).
    [0004]
    4. Device according to claim 3, characterized in that the venturi ejector (23) has a throat (25) of diameter less than the diameter of the discharge pipe (15).
    [0005]
    5. Device according to claim 4, characterized in that the diameter of the strangely (25) is between 0.1 and 0.9 times the diameter of the discharge pipe (15) .VVFR2162 10
    [0006]
    6. Device according to any one of claims 1 to 5, characterized in that the diameter of the suction pipe (17) is smaller than the diameter of the discharge pipe (15).
    [0007]
    7. Device according to claim 6, characterized in that the diameter of the suction pipe (17) is between 0.1 and 0.9 times the diameter of the discharge pipe (15).
    [0008]
    8. Device according to any one of claims 1 to 5, characterized in that it comprises a heating element (29) disposed between the pump (13) and the connection between the discharge pipe (15) and the pipe of suction (17).
    [0009]
    9. Device according to any one of the preceding claims, characterized in that the suction pipe (17) comprises an opening (20) at the bottom.
    [0010]
    10.Dispositif according to any one of claims 1 to 9, characterized in that the air flow at the outlet of the spray nozzle (9) is a laminar air flow.
    [0011]
    11. Device according to any one of claims 1 to 10, characterized in that the air discharge pump (13) comprises an air intake (19) inside the passenger compartment of a motor vehicle .
    [0012]
    12. Rear vision system (1) for a motor vehicle comprising an optical sensor (3) and a device (5) according to any one of claims 1 to 11.30.
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    引用文献:
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    TWI604257B|2016-10-05|2017-11-01|Zheng-Zhi Lin|Car camera lens prevent water mirror device|
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    US10807623B2|2018-06-01|2020-10-20|Tetra Tech, Inc.|Apparatus and method for gathering data from sensors oriented at an oblique angle relative to a railway track|
    US10730538B2|2018-06-01|2020-08-04|Tetra Tech, Inc.|Apparatus and method for calculating plate cut and rail seat abrasion based on measurements only of rail head elevation and crosstie surface elevation|
    CN109622555B|2018-12-06|2021-09-07|中国工程物理研究院激光聚变研究中心|Dynamic cleanness maintaining system and method for high-power terminal optical system|
    DE102019101092A1|2019-01-16|2020-07-16|Motherson Innovations Company Limited|Device for cleaning at least one lens of at least one camera, camera system and camera holder, comprising such a device, and method|
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    CN111438138B|2020-04-07|2021-08-10|河北卓越电气有限责任公司|High-efficient cleaner is used to light curtain strip infrared sensor|
    法律状态:
    2015-09-30| PLFP| Fee payment|Year of fee payment: 2 |
    2016-03-25| PLSC| Search report ready|Effective date: 20160325 |
    2016-09-28| PLFP| Fee payment|Year of fee payment: 3 |
    2017-09-29| PLFP| Fee payment|Year of fee payment: 4 |
    2018-09-28| PLFP| Fee payment|Year of fee payment: 5 |
    2019-09-30| PLFP| Fee payment|Year of fee payment: 6 |
    2021-06-11| ST| Notification of lapse|Effective date: 20210506 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1458968A|FR3026031B1|2014-09-23|2014-09-23|DEVICE FOR PROTECTING AN OPTICAL SENSOR|FR1458968A| FR3026031B1|2014-09-23|2014-09-23|DEVICE FOR PROTECTING AN OPTICAL SENSOR|
    CN201580051391.2A| CN106714989B|2014-09-23|2015-07-28|Equipment for protecting optical sensor|
    US15/513,686| US10676070B2|2014-09-23|2015-07-28|Device for protection of an optical sensor|
    PCT/EP2015/067256| WO2016045828A1|2014-09-23|2015-07-28|Device for protection of an optical sensor|
    EP15742283.3A| EP3197613B1|2014-09-23|2015-07-28|Device for protection of an optical sensor|
    KR1020177010746A| KR20170058420A|2014-09-23|2015-07-28|Device for protection of an optical sensor|
    JP2017515895A| JP6640199B2|2014-09-23|2015-07-28|Devices for protection of optical sensors|
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