WO2023280886A1 - Système de nettoyage d'une surface de détection d'un capteur - Google Patents
Système de nettoyage d'une surface de détection d'un capteur Download PDFInfo
- Publication number
- WO2023280886A1 WO2023280886A1 PCT/EP2022/068649 EP2022068649W WO2023280886A1 WO 2023280886 A1 WO2023280886 A1 WO 2023280886A1 EP 2022068649 W EP2022068649 W EP 2022068649W WO 2023280886 A1 WO2023280886 A1 WO 2023280886A1
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- WIPO (PCT)
- Prior art keywords
- acceleration
- sensor
- detection surface
- drops
- cleaning
- Prior art date
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- 238000001514 detection method Methods 0.000 title claims abstract description 112
- 238000004140 cleaning Methods 0.000 title claims abstract description 96
- 230000001133 acceleration Effects 0.000 claims abstract description 113
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 10
- 241001631457 Cannula Species 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 230000001902 propagating effect Effects 0.000 claims description 5
- 238000000151 deposition Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 8
- 238000009826 distribution Methods 0.000 description 7
- 230000005484 gravity Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 239000000428 dust Substances 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000003075 superhydrophobic effect Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/56—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/46—Cleaning windscreens, windows or optical devices using liquid; Windscreen washers
- B60S1/48—Liquid supply therefor
- B60S1/52—Arrangement of nozzles; Liquid spreading means
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0006—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation
Definitions
- the present invention relates to a system for cleaning a detection surface of a vehicle sensor. It finds a particular but non-limiting application in the field of vehicles or in the field of building.
- a system for cleaning a detection surface of a sensor for a vehicle which comprises a device for projecting an air flow which projects an air flow onto the sensing surface of said sensor in order to remove obstructing elements on said sensing surface which obstruct and disturb the field of view of said sensor and thereby clean said sensing surface of said obstructing elements.
- These obstructing elements are drops of water or dust.
- the detection surface is the surface in the field of view of the sensor.
- a disadvantage of this state of the prior art is that the cleaning system is not effective if the drops of water or dust are small. They are too difficult to remove with the airflow, unless you have a very powerful airflow projection device, which then becomes too bulky and too expensive.
- the present invention aims to propose a system for cleaning a detection surface of a sensor for a vehicle which makes it possible to perform effective cleaning of the detection surface of a sensor for a vehicle.
- the invention proposes a system for cleaning a detection surface of a sensor, characterized in that said cleaning system comprising: - a cleaning device comprising a plurality of nozzles configured to deposit drops of liquid on an acceleration surface located upstream of said detection surface, - a tank connected to said cleaning device and configured to store said liquid, - A device for accelerating the movement of said drops of liquid from said acceleration surface to said detection surface.
- said cleaning system may also comprise one or more additional characteristics taken alone or according to all the technically possible combinations, among the following.
- said detection surface and said acceleration surface form part of said sensor, or - said detection surface and said acceleration surface are not part of said sensor.
- said drops have a volume of between 2 ⁇ l and 50 ⁇ l.
- the liquid has a surface tension greater than a surface tension of said detection surface.
- said cannulas are spaced from each other so that said drops form a water front.
- said detection surface and said acceleration surface are on the same plane.
- said cleaning device further comprises a perforated ramp connected on one side to said cannulas and on the other side to said reservoir.
- said cleaning device further comprises a support element for said perforated ramp.
- part of the detection surface is partially coincident with part of the acceleration surface.
- said acceleration device is: - a device for projecting an air flow, or - a device composed of a mesh of electrodes configured to be crossed by an electric current, or - a device configured to create a Leindefrost effect, or - a device configured to synthesize an ultrasonic wave propagating in the acceleration surface, or - a device composed of particles of different polarities.
- the device configured to synthesize an ultrasonic wave propagating in the acceleration surface comprises at least one wave transducer coupled acoustically with the acceleration surface.
- the surface tension of the liquid is 78mJ/m2 and the surface tension of the detection surface is 20mJ/m2.
- said cannulas have a diameter of between 1 and 6 mm.
- said cannulas are spaced apart by a distance equal to the diameter of the drops +-10%.
- said cannulas are arranged at a distance from the acceleration surface of between 0 and 100% of the diameter of the drops.
- said detection surface and said acceleration surface are inclined by an angle of inclination greater than 20°.
- said cannulas are configured to deposit a drop at a pressure less than or equal to 0.5 bar.
- said cleaning device further comprises a projecting element of said ramp, configured to protect said acceleration surface.
- said support element is further configured to receive said acceleration device.
- said cleaning device further comprises a water distributor to said cannulas.
- said water distributor is arranged between two series of cannulas distributed symmetrically on either side of said water distributor.
- said detection surface and said acceleration surface form part of said sensor, or - said detection surface and said acceleration surface are not part of said sensor.
- part of the detection surface is partially coincident with part of the acceleration surface.
- said sensor is an optical sensor.
- said sensor is a vehicle sensor.
- said sensor is a radar, a lidar or a camera.
- said sensor is a building sensor.
- said sensor is a solar panel or a photovoltaic panel.
- a method for cleaning a detection surface of a sensor for a vehicle characterized in that said cleaning method comprises the steps of: - depositing drops of liquid on an acceleration surface of said sensor located upstream of said detection surface by means of a plurality of cannulas of a cleaning device, - accelerating the movement of said drops of liquid from said accelerating surface onto said detection surface by means of an accelerating device.
- FIG. 1 is a figure of a system for cleaning a detection surface of a sensor, said cleaning system comprising a cleaning device, a reservoir and an acceleration device, according to a non-limiting embodiment of the invention ,
- FIG. 1 is a perspective view of an assembly comprising a sensing surface of a sensor and the cleaning device of the cleaning system of the , according to a non-limiting embodiment,
- FIG. 1 is a side view of the cleaning device of the cleaning system of the , according to a non-limiting embodiment
- FIG. 1 is a bottom view of the cleaning device of the cleaning system of the , according to a non-limiting embodiment
- FIG. 1 is a perspective view of the cleaning device of the cleaning system of the , devoid of a support element, according to a non-limiting embodiment
- FIG. 1 is a sectional view of the cleaning device of the cleaning system of the , according to a non-limiting embodiment
- FIG. 1 is a perspective view of a support member of the cleaning device of the cleaning system of the , according to a non-limiting embodiment
- FIG. 1 is a flowchart of a method for cleaning a detection surface of a sensor, implemented by the cleaning system of the , according to a non-limiting embodiment.
- the cleaning system 1 of a detection surface 20 of a sensor 2 according to the invention is described with reference to FIGS. 1 to 9 according to non-limiting embodiments.
- Sensor 2 is configured to perform a detection function. It includes a field of view, otherwise known as a detection field.
- the senor 2 is an optical sensor.
- the senor 2 is a lidar, a radar or a camera.
- sensor 2 is configured to detect static or dynamic objects.
- the radar is a sensor configured to emit radar waves and receive returning radar waves.
- the lidar is a sensor configured to emit an outgoing laser beam and receive return waves.
- the camera is configured to capture electromagnetic radiation (IR, visible, UV).
- the senor 2 is a solar panel or a photovoltaic panel. In this case, sensor 2 is configured to detect and capture solar energy.
- the senor 2 is a vehicle sensor.
- the vehicle is a motor vehicle.
- Motor vehicle means any type of motorized vehicle.
- the sensor 2 is a vehicle sensor, and it is a camera, in one non-limiting embodiment, the camera is arranged behind the rear windshield of the vehicle towards the top of said windshield. In another non-limiting embodiment, the sensor 2 is a building sensor.
- the detection surface 20 is the surface through which the sensor 2 performs its detection function.
- the detection surface 20 is thus the surface which is in the field of vision of the sensor 2. It thus covers said field of vision.
- this means that the detection surface 20 is traversed by the emitted radar waves and the return radar waves.
- this means that the detection surface 20 is traversed by the laser beam and the return waves.
- the detection surface 20 is either associated with sensor 2, or it is part of sensor 2.
- the detection surface 20 is the surface which must be cleaned when it is covered with elements g2 which obstruct the field of vision of the sensor 2 and consequently the latter will not be able to carry out its detection function correctly.
- g2 elements are otherwise called g2 obstructing elements.
- the obstructing elements g2 are drops of water or dust. Waterdrops are drops of water that come from rain or fog. Often, these drops of water or dust are static on the detection surface 20.
- the detection surface 20 is otherwise called the surface to be cleaned 20.
- the surface to be cleaned 20 is between 50mm and 300mm. This is the case for example of a vehicle sensor 2 such as a camera.
- the surface to be cleaned 20 is between 500mm and 1500mm in length and width. This is the case for example of a building sensor 2 such as a solar or photovoltaic sensor.
- cleaning system 1 includes: - a cleaning device 10, - a tank 11, - an acceleration device 12.
- the tank 11 of the cleaning system 1 is described in detail below.
- the tank 11 is connected to said cleaning device 10 and is configured to store a cleaning liquid Lq, otherwise called liquid Lq.
- the liquid Lq is water.
- the liquid is a superhydrophobic liquid.
- the liquid Lq has a surface tension ⁇ 3 greater than a surface tension ⁇ 1 of said detection surface 20 and far from said surface tension ⁇ 1. This facilitates the rolling of the drops g1 of liquid Lq on the detection surface 20.
- the surface tension ⁇ 3 is equal to 78mJ/m 2 (milli-joules/square meter).
- the surface tension ⁇ 1 is equal to 20 mJ/m 2 (milli-joules/square meter) for a hydrophobic surface. It will be noted that a window-washing liquid comprises a surface tension (30mJ/m 2 ) relatively close to the surface tension ⁇ 1 of the detection surface 20.
- the drops g1 of liquid Lq therefore roll more with difficulty. In the rest of the description, the drops g1 of liquid Lq are otherwise called drops g1.
- the cleaning device 10 of the cleaning system 1 is now described in detail below.
- the cleaning device 10 is placed at a distance from the surface to be cleaned 20. Furthermore, as illustrated in FIGS. 2 and 5, the cleaning device 10 is placed above an acceleration surface 21, in particular its cannulas 100 described below, to enable it to deposit the drops g1 of liquid Lq on said acceleration surface 21.
- the acceleration surface 21 is a surface on which drops g1 of liquid Lq will be deposited by the cannulas 100 of the cleaning device 10, and accelerated by the acceleration device 12 described below.
- the acceleration surface 21 is located upstream of the detection surface 20 with respect to the field of view of the sensor 2.
- upstream it is meant that the acceleration surface 21 is located before the detection surface 20 in the direction of propagation of the liquid Lq.
- the acceleration surface 21 comprises a surface tension ⁇ 2 different from the surface tension ⁇ 1 of said detection surface 20. This makes it possible to obtain rolling angles (called in English "rolling angle ”) of drops g1 of liquid Lq greater than 80°, or even greater than 90° or 160°.
- the detection surface 20 and the acceleration surface 21 are on the same plane. This allows the drops g1 of liquid Lq to slide more easily and thus more easily evacuate the obstructing elements g2.
- the detection surface 20 and the acceleration surface 21 are inclined by an angle of inclination greater than 20° relative to a reference axis.
- the detection surface 20 and the acceleration surface 21 are inclined by an angle of inclination comprised between 20° and 30° with respect to a reference axis.
- the reference axis in this case is the vehicle axis.
- the detection surface 20 and the acceleration surface 21 are horizontal. In a non-limiting example, this applies for a building sensor 2 such as a solar or photovoltaic sensor.
- the detection surface 20 and the acceleration surface 21 are not sufficiently inclined for the obstructing elements g2, in particular when they are static , are naturally driven by gravity out of the detection surface 20.
- the obstructing elements g2 could be evacuated naturally by gravity.
- the evacuation time by gravity is long, which hinders the detection function of sensor 2, or even renders it ineffective, during this evacuation time, otherwise called dead time.
- the natural evacuation by gravity is not efficient enough and there are always residues of clogging elements g2.
- the detection surface 20 and the acceleration surface 21 do not form part of the sensor 2.
- the cleaning system 1 (in particular the cleaning device 10 and the acceleration device 12 ) is located at a distance from the sensor 2 and in particular from the surface to be cleaned 20.
- the cannulas 100 deposit drops g1 on a surface outside the sensor 2.
- a sensor 2 is a vehicle sensor such as a camera which is located behind the rear windshield of said vehicle.
- the cleaning system 1 is not positioned directly near the camera 2 but rather farther upstream from the camera 2 at a so-called dead zone distance.
- the cleaning system 1 is then located on the windshield on the outside or on the bodywork in height relative to the camera 2.
- the acceleration surface 21 and thus forms part in this case of the windshield or of the bodywork, and the detection surface 20 is part of the windshield.
- said detection surface 20 and acceleration surface 21 form part of sensor 2.
- sensor 2 comprises detection surface 20, namely that to be cleaned, and the surface of acceleration 21.
- the cleaning system 1 (in particular the cleaning device 10 and the acceleration device 12) is located close to the surface to be cleaned 20.
- the cannulas 100 deposit drops g1 on a surface portion of the sensor 2.
- a sensor 2 is a building sensor such as a solar sensor or a photovoltaic sensor.
- the total surface formed by the detection surface 20 and the acceleration surface 21 of the sensor 2 is substantially rectangular.
- the total surface is between 100mm and 1500mm.
- a part of the acceleration surface 21 can partially merge with a part of the detection surface 20. This means that the drops g1 of liquid Lq can be accelerated on a part of the detection surface 20.
- said detection surface 20 is part of sensor 2 and acceleration surface 21 is not part of sensor 2.
- sensor 2 comprises detection surface 20, namely that at clean, but not the acceleration surface 21.
- the cleaning system 1 (in particular the cleaning device 10 and the acceleration device 12) is located close to the surface to be cleaned 20.
- the cannulas 100 deposit drops g1 on a surface outside sensor 2.
- the cleaning device 10 includes a plurality of cannulas 100.
- the cleaning device 10 further comprises: - a perforated ramp 101, - a support element 102 of said perforated ramp 101, - a water dispenser 103, - a projecting element 104 of the perforated ramp 101.
- the cleaning device 10 further comprises a hook element 105.
- the elements of the cleaning device 10 are described in detail below.
- the cannulas 100 are configured to generate and deposit drops g1 of liquid Lq on the acceleration surface 21 of the sensor 2 located upstream of said detection surface 20.
- the drops g1 have a volume v0 of between 2 ⁇ l and 50 ⁇ l (microliter). This makes it possible to have drops g1 small enough to limit the consumption of liquid Lq, and large enough so that they can roll on the acceleration surface 21 and on the detection surface 20. They will have a sufficient rolling angle.
- the cannulas 100 are configured to deposit a drop g1 at a pressure less than or equal to 0.5 bar.
- the cannulas 100 thus operate at low pressure, which makes it possible to control the manufacture of the drops g1 and the deposition of the drops g1 on the acceleration surface 21. If the pressure is too high, there will be a jet of liquid Lq rather than a formation of drop g1 of liquid Lq.
- the cannulas 100 have a diameter d1 of between 0.5 mm and 6 mm (millimeter). Note that with a diameter d1 of 0.5mm, g1 drops of 6mm can be created.
- the cannulas 100 are spaced from each other so that the drops g1 deposited form a water front w1 (otherwise called "Wave front" and illustrated on the ).
- the cannulas 100 are spaced apart by a distance d2 (illustrated in the ) equal to the diameter d0 of the drops g1 by plus or minus 10%.
- This water front w1 is a fusion of the drops g1 which is created after the deposition of said drops g1 on the acceleration surface 21 and will make it possible to more effectively cover the entire surface to be cleaned, namely the detection surface 20. with the diameter range d0 of 2 ⁇ l and 50 ⁇ l, this makes it possible to obtain a coalescence of the drops g1 so that they come together in larger drops to form a water front w1.
- the cannulas 100 are arranged at a distance d3 (illustrated in the ) of the acceleration surface 21 between 0 and 100% of the diameter d0 of the drops g1.
- the cannulas 100 are thus calibrated according to the diameter d0 of the drops g1. They are close to the acceleration surface 21.
- This distance d3 is the distance between the bottom of the cannulas 100 and the acceleration surface 21. This allows the drops g1 to detach from the cannulas 100.
- the drop g1 is in contact with the cannula 100 and at the same time with the acceleration surface 21.
- the drop g1 is no longer in contact with the cannula 100 when it is in contact with the acceleration surface 21.
- the drop g1 will pick up speed at the outlet of the cannula 100 before exploding and splitting into several small drops on the surface d acceleration 21.
- the small drops slide on the detection surface 20 and cause the obstructing elements g2, there will remain areas between the small drops where the detection surface 20 will not be cleaned. There will therefore remain traces on the detection surface 20 which will hinder the sensor 2 in carrying out its detection function.
- the perforated ramp 101 includes holes (not shown) into which the cannulas 100 fit.
- the perforated ramp 101 and the cannulas 100 form a single piece for sealing reasons.
- the perforated ramp 101 is connected on one side to the cannulas 100 and on the other side to the reservoir 11 via a connection pipe 106 illustrated in figures 7 and 8.
- the support element 102 of said ramp 101 comprises a cavity 1020 into which said ramp 101 can be inserted.
- the cavity 1020 is longitudinal.
- the support element 102 of said ramp 101 is further configured to receive the acceleration device 12.
- the support element 102 comprises a cavity additional 1021 in which the acceleration device 12 can be inserted. This is the case when the acceleration device 12 comprises a device for projecting an air flow as described below.
- the additional cavity 1021 is arranged at the bottom of the cavity 1020 and facing the cannulas 100.
- the support element 102 further comprises a protective cover 1022 configured to protect the connection pipe 106 described previously.
- the support member 102 further comprises an orifice 1023 into which the water dispenser 103 can be inserted to connect to the connection pipe 106 as illustrated in the figure below. .
- This orifice 1023 leads to the cavity 1020.
- the support element 102 further comprises a support element 1024 configured to rest on a support 3 (illustrated in the ) on which said cleaning device 10 will land.
- a support 3 illustrated in the said support element 1024 is composed of two support legs.
- the water distributor 103 is configured to distribute the liquid Lq to the cannulas 100.
- the ramp 101 is thus connected to the reservoir 11 via the water distributor 103.
- the water distributor 103 is connected to the tank 11 via the connection pipe 106.
- the distribution of liquid Lq in the cannulas 100 is done homogeneously, continuously and for a limited period of time.
- homogeneous it is meant that the distribution of liquid Lq allows the creation of drops g1 of the same size for all the cannulas 100 at the same time.
- continuous we mean that the distribution of liquid Lq allows the creation of drops g1 one after the other by a cannula 100.
- the limited period of time makes it possible to reduce the consumption of liquid Lq.
- the time period is 0.5 seconds. This makes it possible to create a water front w1 or a line of drops g1.
- the water distributor 103 in order to have a homogeneous and continuous distribution, is arranged between two series 100a and 100b (illustrated in FIGS. 7 and 8 for example) of cannulas 100 distributed symmetrically on both sides. other side of the water distributor 103.
- the water distributor 103 is T-shaped. It will be noted that in the case where the water distributor 103 is arranged at one end of the ramp 101 and not in the middle, the water distribution would risk being discontinuous and uneven.
- inhomogeneous is meant a distribution not evenly distributed, the nearest cannulas 100 receiving more liquid Lq than the furthest cannulas 100, which could create differences in size between the g1 drops created.
- the cleaning system 1 may further comprise a solenoid valve (not shown) to control the opening time of the water distributor 103. There will be thus a limited time period of water distribution.
- the projecting element 104 of said ramp 101 is configured to protect the acceleration surface 21 from external attacks such as, in non-limiting examples, dirt, wind, etc.
- the projecting element 104 and the support element 102 form a single piece.
- the projecting element 104 extends above the cannulas 100.
- the attachment element 105 is configured to attach the cleaning device 10 to a support 3 (illustrated in the ) which is either part of the sensor 2, or which is independent of the sensor 2.
- the support 3 is the body of the vehicle or the vehicle breeze.
- the support 3 is the structure of said sensor 2.
- the attachment element 105 is a screw.
- the acceleration device 12 of the cleaning system 1 is now described in detail below.
- the acceleration device 12 is configured to accelerate the movement of the drops g1 of liquid Lq from said acceleration surface 21 onto said detection surface 20.
- the cleaning time of the detection surface 20 is thus reduced.
- the dead time which may exist when the sensor 2 performs its detection function is thus reduced, dead time due to the obstructing elements g2 which interfere with said function of detection.
- the viscosity of the drops g1 changes with the temperature. It increases when it is cold.
- the drops g1 risk not flowing quickly enough on the acceleration surface 21 and then on the detection surface 20 and thus risk not sufficiently entraining the obstructing elements. g2 so as to evacuate them outside the detection surface 20.
- the surface condition of the detection surface 20 is overcome. Indeed, if the detection surface 20 is not sufficiently hydrophobic, the drops g1 will have difficulty in roll naturally by gravity on the detection surface 20 and will have difficulty in effectively driving the obstructing elements g2.
- the angle of inclination of the detection surface 20 is overcome. Indeed, if the angle of inclination is less than 20%, the drops g1 will have difficulty in roll naturally by gravity on the detection surface 20 and will have difficulty in effectively driving the obstructing elements g2.
- the acceleration of the drops g1 makes it possible to give them enough kinetic energy to roll correctly on the acceleration surface 21 and on the detection surface 20 and thus effectively entrain the obstructing elements g2 so as to evacuate them outside the detection surface 20.
- the acceleration device 12 is described according to various non-limiting embodiments below.
- the acceleration device 12 is a device for projecting an air flow.
- the device for projecting an air flow is thus a fan.
- the air flow is directed on the drops g1 so as to accelerate them.
- the device for projecting an air flow is placed in the additional cavity 1021 of the support element 102 of the ramp 101 described above.
- the acceleration device 12 is a device composed of a mesh of electrodes configured to be traversed by an electric current. Electric current is alternating. This creates a creeping motion to the g1 drops to accelerate their movement. The drops g1 are thus rendered hydrophilic. This mesh of electrodes is integrated into the acceleration surface 21.
- the acceleration device 12 is a device configured to create a Leindefrost effect by heating the acceleration surface 21.
- the Leidenfrost effect is the phenomenon which heats up a drop of liquid on a hot plate. Thus, instead of boiling violently and vaporizing, the g1 drops take on a very rounded shape and become ultra-mobile.
- the acceleration surface 21 is heated to more than 160°.
- the acceleration device 12 is placed at the level of the acceleration surface 21.
- the acceleration device 12 is a flexible substrate comprising piezoelectric elements.
- the acceleration device 12 is composed of thermo-resistors.
- the acceleration device 12 is a device configured to synthesize an ultrasonic wave propagating in the acceleration surface (21).
- the device includes at least one wave transducer acoustically coupled with the acceleration surface (21). This device allows the setting in motion and the acceleration of the liquid on the acceleration surface (21) under the action of the ultrasonic wave.
- the liquid takes the form of very rounded and therefore ultra-mobile g1 drops. This thus allows simple and effective cleaning of the detection surface (20) when these drops g1 reach the latter.
- the acceleration device 12 is a device configured to synthesize an ultrasonic wave propagating in the acceleration surface (21) as well as in the detection surface (20).
- the device comprises at least one wave transducer acoustically coupled with the acceleration surface (21) and with the detection surface (20).
- the liquid takes the form of very rounded and therefore ultra-mobile drops g1 on the acceleration surface (21).
- the setting in motion and the acceleration of the liquid under the action of the ultrasonic wave on the acceleration surface (21) facilitates the spreading of the liquid on the detection surface (20), of the layer formed by the liquid. It also makes it possible to effectively evacuate the soiled liquid from the detection surface.
- the droplets of soiled liquid which are attached to the detection surface under the effect of the action of capillary forces can easily be evacuated.
- the acceleration device 12 is a device composed of particles of different polarities.
- the acceleration device 12 is integrated in the acceleration surface 21, namely it is the acceleration surface 21 which is composed of particles of different polarities.
- the drops g1 polarize; the polarization causes small rebounds of the drops g1 which results in accelerations of said drops g1.
- the cleaning system 1 is configured to implement a cleaning method 5 of a detection surface 20 of a sensor 2.
- the cleaning method 5 is illustrated on the includes the steps: - E1 illustrated F1 (g1, 21, 1 (100)) to deposit drops g1 of liquid Lq on an acceleration surface 21 located upstream of said detection surface 20 by means of a plurality of cannulas 100 of a cleaning device 10, - E2 illustrated F2(g1, 21, 12) to accelerate the displacement of said drops g1 of liquid Lq from said acceleration surface 21 onto said detection surface 20 by means of an acceleration device 12.
- the description of the invention is not limited to the embodiments described above and to the field described above.
- the total surface 22 formed by the detection surface 20 and the acceleration surface 21 is curved.
- the total surface 22 is oval or round.
- the sensor 2 is a light emitter such as in a non-limiting example a headlight.
- a non-limiting example of sensor 2 located behind the rear windshield of a vehicle has been given.
- the cleaning system 1 can also apply to a sensor 2 located behind the front windshield of a vehicle.
- the invention described has in particular the following advantages: - it makes it possible to effectively clean a detection surface 20 of the sensor 2 by combining the use of drops g1 of liquid Lq and an acceleration of said drops g1, - it makes it possible to effectively replace a solution using a device for projecting an air flow alone whose air flow alone is not effective if the obstructing elements g2 are too small, - it is effective regardless of the size of the obstructing elements g2, - it can treat large surfaces unlike a rotary solution using centrifugal force to eliminate obstructing elements g2, - it makes it possible to avoid having parts vibrating, unlike a solution using ultrasound to eliminate obstructing elements g2; it is a solution applicable on polymer parts, - it makes it possible to address the same size of sensors 2 as for the other solutions used, - the cleaning system 1 can be placed at a distance from the sensor 2 and in particular from its detection surface 20 to allow good integration of the cleaning system 1 in a vehicle, - it
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Abstract
Description
- un dispositif de nettoyage comprenant une pluralité de canules configurées pour déposer des gouttes de liquide sur une surface d’accélération située en amont de ladite surface de détection,
- un réservoir connecté audit dispositif de nettoyage et configuré pour stocker ledit liquide,
- un dispositif d’accélération du déplacement desdites gouttes de liquide de ladite surface d’accélération sur ladite surface de détection.
- ladite surface de détection et ladite surface d’accélération ne font pas partie dudit capteur.
- un dispositif de projection d’un flux d’air, ou
- un dispositif composé d’un maillage d’électrodes configuré pour être traversé par un courant électrique, ou
- un dispositif configuré pour créer un effet Leindefrost, ou
- un dispositif configuré pour synthétiser une onde ultrasonore se propageant dans la surface d’accélération, ou
- un dispositif composé de particules de polarités différentes.
- ladite surface de détection et ladite surface d’accélération ne font pas partie dudit capteur.
- déposer des gouttes de liquide sur une surface d’accélération dudit capteur située en amont de ladite surface de détection au moyen d’une pluralité de canules d’un dispositif de nettoyage,
- accélérer le déplacement desdites gouttes de liquide de ladite surface d’accélération sur ladite surface de détection au moyen d’un dispositif d’accélération.
- un dispositif de nettoyage 10,
- un réservoir 11,
- un dispositif d’accélération 12.
- une rampe perforée 101,
- un élément support 102 de ladite rampe perforée 101,
- un distributeur d’eau 103,
- un élément en saillie 104 de la rampe perforée 101.
Dans un exemple non limitatif, le dispositif d’accélération 12 est un dispositif configuré pour synthétiser une onde ultrasonore se propageant dans la surface d’accélération (21) ainsi que dans la surface de détection (20). Le dispositif comprend au moins un transducteur d’ondes couplé acoustiquement avec la surface de d’accélération (21) et avec la surface de détection (20). Le liquide prend la forme de gouttes g1 très arrondie et donc ultra-mobiles sur la surface d’accélération (21). Notamment, la mise en mouvement et l’accélération du liquide sous l’action de l’onde ultrasonore sur la surface d’accélération (21) facilite l’étalement du liquide sur la surface détection (20), de la nappe formée par le liquide. Elle permet en outre d’évacuer efficacement le liquide souillé hors de la surface de détection. Les gouttelettes de liquide souillé qui sont accrochées à la surface de détection sous l’effet de l’action des forces capillaires peuvent aisément être évacuées.
- E1 illustrée F1(g1, 21, 1(100)) de déposer des gouttes g1 de liquide Lq sur une surface d’accélération 21 située en amont de ladite surface de détection 20 au moyen d’une pluralité de canules 100 d’un dispositif de nettoyage 10,
- E2 illustrée F2(g1, 21, 12) d’accélérer le déplacement desdites gouttes g1 de liquide Lq de ladite surface d’accélération 21 sur ladite surface de détection 20 au moyen d’un dispositif d’accélération 12.
- elle permet de nettoyer efficacement une surface de détection 20 du capteur 2 en combinant l’utilisation de gouttes g1 de liquide Lq et une accélération desdites gouttes g1,
- elle permet de remplacer efficacement une solution utilisant un dispositif de projection d’un flux d’air seul dont le seul flux d’air n’est pas efficace si les éléments obstruants g2 sont trop petits,
- elle est efficace quelque soit la taille des éléments obstruants g2,
- elle permet de traiter de grandes surfaces contrairement à une solution rotative utilisant la force centrifuge pour éliminer les éléments obstruants g2,
- elle permet d’éviter d’avoir des pièces en vibration contrairement à une solution utilisant les ultrasons pour éliminer les éléments obstruants g2 ; c’est une solution applicable sur des pièces en polymères,
- elle permet d’adresser la même taille de capteurs 2 que pour les autres solutions utilisées,
- le système de nettoyage 1 peut être placé à distance du capteur 2 et notamment de sa surface de détection 20 pour permettre une bonne intégration du système de nettoyage 1 dans un véhicule,
- c’est une solution qui s’adapte à des capteurs 2 de véhicule se trouvant par exemple derrière le pare-brise arrière ou avant, tel qu’une caméra, pare-brise qui ne peut recevoir de système de nettoyage à proximité dudit capteur 2 mais seulement à distance ; c’est une solution moins encombrante qu’un ou plusieurs dispositifs de projection d’un flux d’air qui devraient être utilisés dans ce cas pour pouvoir générer un flux d’air suffisamment puissant pour parcourir la distance qui le sépare dudit capteur 2 pour le nettoyer.
Claims (13)
- Système de nettoyage (1) d’une surface de détection (20) d’un capteur (2), caractérisé en ce que ledit système de nettoyage (1) comprenant :
- un dispositif de nettoyage (10) comprenant une pluralité de canules (100) configurées pour déposer des gouttes (g1) de liquide (Lq) sur une surface d’accélération (21) située en amont de ladite surface de détection (20),
- un réservoir (11) connecté audit dispositif de nettoyage (10) et configuré pour stocker ledit liquide (Lq),
- un dispositif d’accélération (12) du déplacement desdites gouttes (g1) de liquide (Lq) de ladite surface d’accélération (21) sur ladite surface de détection (20). - Système de nettoyage (1) selon la revendication précédente, selon lequel lesdites gouttes (g1) ont un volume (v0) compris entre 2μl et 50μl.
- Système de nettoyage (1) selon l’une quelconque des revendications précédentes, selon lequel le liquide (Lq) possède une tension de surface (γ3) supérieure à une tension de surface (γ1) de ladite surface de détection (20).
- Système de nettoyage (1) selon l’une quelconque des revendications précédentes, selon lequel lesdites canules (100) sont espacées les unes des autres de sorte que lesdites gouttes (g1) forment un front d’eau (w1).
- Système de nettoyage (1) selon l’une quelconque des revendications précédentes, selon lequel ledit dispositif de nettoyage (10) comprend en outre une rampe perforée (101) connectée d’un côté auxdites canules (100) et d’un autre côté audit réservoir (11).
- Système de nettoyage (1) selon la revendication précédente, selon lequel ledit dispositif de nettoyage (10) comprend en outre un élément support (102) de ladite rampe perforée (101).
- Système de nettoyage (1) selon l’une quelconque des revendications précédentes, selon lequel ledit dispositif d’accélération (12) est :
- un dispositif de projection d’un flux d’air, ou
- un dispositif composé d’un maillage d’électrodes configuré pour être traversé par un courant électrique, ou
- un dispositif configuré pour créer un effet Leindefrost, ou
- un dispositif configuré pour synthétiser une onde ultrasonore se propageant dans la surface d’accélération (21), ou
- un dispositif composé de particules de polarités différentes. - Ensemble comportant une surface de détection (20) d’un capteur (2) et le système de nettoyage (1) selon l’une quelconque des revendications précédentes.
- Ensemble selon la revendication précédente, selon lequel ledit capteur (2) est un capteur optique.
- Ensemble selon la revendication précédente 8 ou 9, selon lequel :
- ladite surface de détection (20) et ladite surface d’accélération (21) font partie dudit capteur (2), ou
- ladite surface de détection (20) et ladite surface d’accélération (21) ne font pas partie dudit capteur (2). - Ensemble selon l’une quelconque des revendications précédentes 8 à 10, selon lequel ladite surface de détection (20) et ladite surface d’accélération (21) sont sur un même plan.
- Ensemble selon l’une quelconque des revendications précédentes 8 à 11, selon lequel une partie de la surface de détection (20) est partiellement confondue avec une partie de la surface d’accélération (21).
- Procédé de nettoyage (5) d’une surface de détection (20) d’un capteur (2) pour véhicule (3), caractérisé en ce que ledit procédé de nettoyage (5) comprend les étapes de :
- déposer des gouttes (g1) de liquide (Lq) sur une surface d’accélération (21) dudit capteur (2) située en amont de ladite surface de détection (20) au moyen d’une pluralité de canules (100) d’un dispositif de nettoyage (10),
- accélérer le déplacement desdites gouttes (g1) de liquide (Lq) de ladite surface d’accélération (21) sur ladite surface de détection (20) au moyen d’un dispositif d’accélération (12).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP22737500.3A EP4366989A1 (fr) | 2021-07-07 | 2022-07-05 | Système de nettoyage d'une surface de détection d'un capteur |
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FR2107367A FR3124995B1 (fr) | 2021-07-07 | 2021-07-07 | Système de nettoyage d’une surface de détection d’un capteur |
FRFR2107367 | 2021-07-07 |
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WO2023280886A1 true WO2023280886A1 (fr) | 2023-01-12 |
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PCT/EP2022/068649 WO2023280886A1 (fr) | 2021-07-07 | 2022-07-05 | Système de nettoyage d'une surface de détection d'un capteur |
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EP (1) | EP4366989A1 (fr) |
FR (1) | FR3124995B1 (fr) |
WO (1) | WO2023280886A1 (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018059793A1 (fr) * | 2016-09-28 | 2018-04-05 | Valeo Systèmes d'Essuyage | Dispositif de nettoyage destiné à projeter au moins un fluide vers une surface à nettoyer d'un véhicule automobile |
DE102017216917A1 (de) * | 2017-09-25 | 2019-04-25 | Volkswagen Aktiengesellschaft | Kamerasystem für ein Fahrzeug, Fahrzeug |
DE102017221505A1 (de) * | 2017-11-30 | 2019-06-06 | Robert Bosch Gmbh | Vorrichtung, ausgebildet zur Umfelderfassung |
WO2021018493A1 (fr) * | 2019-07-31 | 2021-02-04 | Valeo Systemes D'essuyage | Organe de distribution et de projection destiné à un système de nettoyage pour un bloc de capteurs de véhicule automobile |
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2021
- 2021-07-07 FR FR2107367A patent/FR3124995B1/fr active Active
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2022
- 2022-07-05 EP EP22737500.3A patent/EP4366989A1/fr active Pending
- 2022-07-05 WO PCT/EP2022/068649 patent/WO2023280886A1/fr active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018059793A1 (fr) * | 2016-09-28 | 2018-04-05 | Valeo Systèmes d'Essuyage | Dispositif de nettoyage destiné à projeter au moins un fluide vers une surface à nettoyer d'un véhicule automobile |
DE102017216917A1 (de) * | 2017-09-25 | 2019-04-25 | Volkswagen Aktiengesellschaft | Kamerasystem für ein Fahrzeug, Fahrzeug |
DE102017221505A1 (de) * | 2017-11-30 | 2019-06-06 | Robert Bosch Gmbh | Vorrichtung, ausgebildet zur Umfelderfassung |
WO2021018493A1 (fr) * | 2019-07-31 | 2021-02-04 | Valeo Systemes D'essuyage | Organe de distribution et de projection destiné à un système de nettoyage pour un bloc de capteurs de véhicule automobile |
Also Published As
Publication number | Publication date |
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FR3124995B1 (fr) | 2024-06-07 |
FR3124995A1 (fr) | 2023-01-13 |
EP4366989A1 (fr) | 2024-05-15 |
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