WO2020126299A1

WO2020126299A1 - Wiper system for a rear window, having a sprayer device

Info

Publication number: WO2020126299A1
Application number: PCT/EP2019/082147
Authority: WO
Inventors: Thierry Cheng; Véronique AUTRET
Original assignee: Valeo Systèmes d'Essuyage
Priority date: 2018-12-20
Filing date: 2019-11-21
Publication date: 2020-06-25
Also published as: FR3090539A1; FR3090539B1

Abstract

The subject of the present invention is a wiper system (1) for a rear window (3), having at least one optical sensor (5) having an optical unit (51), said wiper system (1) having: a sprayer device (7') configured to spray at least a part of the rear window (3) with a cleaning liquid (8), at least one wiper blade (9) intended to be disposed in contact with the rear window (3), said wiper blade (9) being configured to be moved between a first position and a second position, the sprayer device (7') being movable between a rest position and an extreme spraying position, and the movement of the sprayer device (7') having at least one specific position for spraying the optical unit (51) of the optical sensor (5), in which position the cleaning liquid (8) is intended to be sprayed in the direction of the optical unit (51) of the optical sensor (5).

Description

Title of the invention: Wiping system for a rear window having a spraying device

The present invention relates to the field of window wiping systems of a motor vehicle, such as for example the windshield or the rear window. More particularly, the present invention relates to the field of rear window wiping systems of motor vehicles.

Today, a large number of optical sensors are used in motor vehicles to form driving assistance systems. Such optical sensors can for example be arranged near the rear window of this motor vehicle. Indeed, such an arrangement of these optical sensors can allow their use to take road scenes behind the vehicle for example in the context of parking assistance devices, or for monitoring traffic at the rear of the motor vehicle in the case of autonomous vehicles. However, in such an arrangement, the optical sensors are highly subject to soiling, such as dust or splashing of mud, and to climatic vagaries, which can affect their good operability.

In recent years, numerous devices for cleaning such optical sensors have been developed in order to allow good operability of the latter. However, these different cleaning devices known from the prior art, when they use cleaning liquid, have their own nozzles for spraying cleaning liquid. Thus, these cleaning devices require either to provide an access hatch in order to be able to fill the cleaning liquid intended to be used for cleaning the optical sensor when this cleaning device has a clean tank or a tedious and expensive installation because it it is necessary to connect this cleaning device to the general tank of cleaning liquid of the motor vehicle in order to guarantee the supply of this cleaning device with cleaning liquid. On the other hand, the optical sensor cleaning devices known from the prior art are additional elements added to the motor vehicle, which increases the cost of this motor vehicle.

Document US 2009/0250533 discloses a spraying device having an orienting element configured to direct a cleaning liquid either towards the external surface of a window or towards the optics of a camera. This document specifies that the change of position of the orienting element is carried out by modification of the pressure of the cleaning liquid in this spraying device and that this modification of pressure is controlled by a user of the motor vehicle. However, such an orienting element can be caused to lock and can no longer pivot or even be subject to breakage or even to deformation under the effect of the stresses undergone. Thus, such a spray device can have a limited lifespan. In addition, this change in pressure leads to an increase in the consumption of cleaning liquid and therefore in the costs of cleaning this window and the field of vision of this optical sensor.

The present invention aims to overcome or less partially the defects of the prior art set out above by proposing a wiping system allowing the cleaning of a rear window and at least one optical sensor requiring lower quantities. cleaning liquid than those known from the prior art.

Another objective of the present invention, different from the previous objective, is to provide a wiping system allowing cleaning of an external surface of a window and of an optic of an optical sensor.

Another objective of the present invention, different from the previous objectives, is to provide a wiping system whose efficiency and durability are improved.

In order to achieve at least partially at least one of the aforementioned objectives, the present invention relates to a system for wiping a rear window of a motor vehicle having at least one optical sensor comprising an optic, said wiping system presenting:

a spray device configured to spray at least part of an external surface of the rear window with a cleaning liquid,

at least one wiper blade intended to be placed in contact with the surface external of the rear window, said wiper blade being configured to be moved on this external surface between a first and a second position in order to at least partially wipe this external surface, and

a wiper drive motor configured to allow the wiper blade to move between its first and second positions,

the spray device being movable between a rest position and an extreme spray position, and the movement of the spray device having at least one specific position for spraying the optics of the optical sensor, in which the cleaning is intended to be projected towards the optics of the optical sensor.

Such movement of the spray device allows the use of this spray device fitted to the motor vehicle for cleaning the rear window in order to spray cleaning liquid towards the optics of the optical sensor in order to clean the field. of vision of this optical sensor. Thus, it is possible to use a single spray device to allow both cleaning of the rear window and that of the optics of the optical sensor. Furthermore, such a spraying device makes it possible to reduce the costs associated with the presence of the optical sensor because this optical sensor no longer requires a clean cleaning device to guarantee its state of cleanliness and therefore its good

operation.

The wiping system according to the present invention may further comprise one or more of the following characteristics taken alone or in combination.

The wiping system may further comprise an electronic control unit configured to control the movement of the wiper blade between its first and second positions and to control the spraying of cleaning liquid as a function of the position of the wiper blade.

According to a particular embodiment, the spray device can be adapted to be mounted on a body element of the motor vehicle.

According to this particular embodiment, the spraying device may comprise a projection element of angled shape having an inlet for the cleaning liquid and a projection nozzle oriented at least partially in the direction of the external surface of the rear window and configured to allow the projection of cleaning liquid, said nozzle of projection being movable between the rest position and the extreme spray position passing through the specific spray position of the optics of the optical sensor under the effect of an actuator.

In one aspect, the projection nozzle can be moved in translation between the rest position and the extreme spray position via the specific spray position of the optics of the optical sensor.

According to another aspect, the projection element can have a pivot connection disposed at a bend present between the inlet and the projection nozzle, and the displacement of the projection nozzle can comprise a first step of displacement in translation of the projection nozzle between its rest position and its specific spraying position and a second stage of pivoting movement of the projection nozzle between its specific spraying position of the optics of the optical sensor and its extreme position of spraying, said pivoting movement being carried out along an axis

perpendicular to a direction of extension of the projection nozzle so as to move the projection nozzle away from the external surface of the rear window.

The rest position and the specific spray position of the spray nozzle can be confused.

According to this particular embodiment, the projection element is configured to spray cleaning liquid towards the optics of the optical sensor when the spray nozzle is in its specific spraying position and to spray cleaning liquid onto the outer surface of the rear window when the spray nozzle is in its extreme spray position.

According to another particular embodiment, the spray device can be carried by the wiper blade.

According to one aspect, the spraying device can comprise a pipe for supplying cleaning liquid fixed to the wiper blade. According to this aspect, the wiper blade has first and second longitudinal ends and the cleaning liquid supply line extends between the first and second longitudinal ends of the wiper blade.

According to another aspect, the spraying device can comprise a pipe for supplying cleaning liquid integrated into the wiper blade.

The first longitudinal end of the wiper blade may have a guide arm intended to be fixed to a body element of the motor vehicle and the second longitudinal end may be free, said second longitudinal end being configured to be moved on the external surface of the rear window in a semi-circular movement between the first and second positions of the wiper blade.

According to this other particular embodiment, the electronic control unit can be configured to allow the projection of cleaning liquid by the spraying device when the wiper blade sweeps a predefined spraying area comprising the optics of the sensor. optical.

According to a first variant of this other embodiment, the second free longitudinal end may include the spraying device.

According to one aspect of this first variant, the predefined spraying zone can correspond to an angular range less than or equal to 15 ° on either side of the optics of the optical sensor.

According to another aspect of this first variant, the predefined area for spraying the wiper blade corresponds to the specific position for spraying the optics of the optical sensor.

According to this other aspect, the electronic control unit can control the stopping of the movement of the wiper blade when the spraying device is aligned with the optics of the optical sensor, this position corresponding to the specific spraying position of optical sensor optics.

According to a second variant of this other particular embodiment, the optics of the optical sensor can be arranged between the first and second positions of the brush. wiping and the wiping brush may have a plurality of openings configured to allow the projection of cleaning liquid on the external surface of the rear window during its movement between its first and second positions.

According to a third variant of this other embodiment, the wiper blade may further comprise a parking position disposed before the first position of movement of the wiper blade and the optics of the optical sensor may be disposed between the position of parking and the first position of the wiper blade.

Alternatively or additionally, the optics of the optical sensor can be covered by the wiper blade when the wiper blade occupies its parking position.

According to this third variant, the specific spraying position can correspond to the parking position.

According to this third variant, the rest position of the spraying device can correspond to the first position of the wiping brush and the extreme spraying position can correspond to the second position of the wiping brush.

The optical sensor can be arranged in a body element placed above the rear window in the mounted state of the rear window on the motor vehicle.

According to a particular embodiment, the guide arm can be fixed to the body element comprising the optical sensor.

Other characteristics and advantages of the present invention will appear more clearly on reading the following description, given by way of illustration and not limitation, and the appended drawings in which:

[Fig.l] Figure 1 is a schematic side representation of a motor vehicle having a wiping system according to a first particular embodiment; [Fig.2A] Figure 2A is an enlarged side schematic representation of the wiping system of Figure 1 having a spray device in a rest position according to a first variant;

[Fig.2B] Figure 2B is a side schematic representation of the spray device of Figure 2A in a specific position of spraying;

[Fig.2C] Figure 2C is a side schematic representation of the spray device of Figure 2A in an extreme spray position;

[Fig.3A] Figure 3A is an enlarged side schematic representation of the wiping system of Figure 1 having a spray device in a rest position according to a second variant;

[Fig.3B] Figure 3B is a side schematic representation of the spray device of Figure 3A in a specific spray position;

[Fig.3C] Figure 3C is a side schematic representation of the spray device of Figure 3A in an extreme spray position;

[Fig.4] Figure 4 is a schematic front view of a wiping system according to a second embodiment;

[Fig.5A] Figure 5A is a schematic front view of a wiping system according to a variant of the second embodiment when a wiper blade is in the parking position; and

[Fig.SBj Figure 5B is a schematic front view of the wiping system of Figure 5A when the wiper blade is located between a first and a second position.

Identical elements in the different figures 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 apply only to a single embodiment. Simple features of different embodiments can also be combined and / or interchanged to provide other embodiments.

In the present description, it is possible to index certain elements or parameters, such as for example first element or second element as well as first parameter and second parameter or even first criterion and second criterion etc. In this case, it is a simple indexing to differentiate and name elements or parameters or criteria that are similar but not identical. This indexing does not imply a priority of an element, parameter or criterion over another and one can easily interchange such names without departing from the scope of this description. This indexing also does not imply an order in time for example to assess this or that criterion.

Referring to Figures 1 to 5B, there is shown a wiping system 1 of a rear window 3 of a motor vehicle. The rear window 3 has an external surface 3a configured to be placed in contact with the environment outside the motor vehicle. More particularly, dirt such as dust coming from the outside or even mud projection for example can come to be deposited on this external surface 3a of the rear window 3. On the other hand, the motor vehicle has at least one sensor optic 5 comprising an optic 51 configured to take road scenes located at the rear of the motor vehicle. This optical sensor 5 can for example be a CCD sensor (for “charged coupled device” in English, namely a charge transfer device) or a CMOS sensor comprising at least one matrix of miniature photodiodes. optical lens 51 can for example be a lens, a lens can comprise at least one lens, in particular several lenses depending on the field of vision and the resolution of the optical sensor 5.

Such an optical sensor 5 can for example be a reversing camera generally used for parking assistance or an optical sensor 5 used to detect traffic behind the motor vehicle in the case of autonomous vehicles. More particularly, this optical sensor 5 can be disposed behind this rear window 3 or else in a bodywork element 11 disposed near this rear window 3 in the mounted state of this rear window 3 on the motor vehicle, as for example in the bodywork element 11 supporting a third brake light generally disposed at the level of a trunk door of the motor vehicle for example. The wiping system 1 has a spraying device 7, 7 'and at least one wiping brush 9 disposed in contact with the external surface 3a of the rear window 3. The wiping brush 9 is configured to be moved on this external surface 3a between a first and a second position in order to at least partially wipe this external surface 3a. Furthermore, the wiping system also has a drive motor (not shown) for the wiper blade 9. The drive motor is configured to allow the wiper blade 9 to move between its first and second positions On the other hand, the spraying device 7, 7 'is configured to spray at least part of the external surface 3a of the rear window 3 with a cleaning liquid 8 (visible in FIGS. 2B, 2C, and 3B 4] Typically, this spraying device 7, 7 'corresponds for example to a nozzle fitted to the motor vehicle, since such nozzles are present on motor vehicles because stubborn or encrusted dirt may not leave. by simply sweeping with the wiping brush 9, and the spraying of cleaning liquid 8 makes it possible to moisten these stains in order to facilitate their removal during the passage of the wiping brush 9.

The spray device 7, 7 ′, according to the various embodiments shown with reference to FIGS. 1 to 5B, is movable between a rest position (visible in FIGS. 2A and 3 A for example] and an extreme position of spraying (visible in FIGS. 2C and 3C for example]. In addition, the movement of the spraying device 7, 7 ′ has at least one specific spraying position (visible in FIGS. 2B, 3B and 4 in particular) of the optics 51 of the optical sensor 5. In this specific spray position, the cleaning liquid 8 is intended to be projected towards the optics 51 of the optical sensor 5. It is thus possible to use the sprinkling 7, 7 ′ present on the motor vehicle in order to allow the cleaning of the optics 51 of the optical sensor, and more particularly the field of vision of this optics 51. In fact, it is fairly conventional to install this optical sensor 5 behind a protective element, such as a window protection, in order to prevent any degradation of this optic 51 due to external aggressions such as humidity or even solid projections. Thus, the spray device 7, 7 'projects cleaning liquid 8 towards this protective element so as to remove any dirt present on the latter. It is thus possible to limit the costs of the motor vehicle because it has a single spraying device both for cleaning the field of vision of the optics 51 of the optical sensor 5 and for the external surface 3a of the rear window 3. Furthermore, the use of such a spray device 7 makes it possible to limit the consumption of cleaning liquid 8 during the cleaning of this rear window 3 and of the optics 51 of the optical sensor 5. On the other hand, the use of a single spray device 7, 7 'for cleaning the rear window 3 and the field of vision of the optical sensor 5 makes it possible to simplify the architecture of this spray device 7 , T on the motor vehicle. In particular, the motor vehicle may have a single tank of cleaning liquid, which simplifies the paths of the supply pipes for cleaning liquid and the supply, more specifically the filling, of cleaning liquid to ensure proper operation. of this spraying device 7, 7 '. On the other hand, the use of a mobile spraying device 7, 7 'makes it possible to differentiate the washing of the field of vision of the optics 51 of the optical sensor 5 from that of the external surface 3a of the rear window 3 , which in particular makes it possible to limit the consumption of cleaning liquid. Indeed, the surface to be cleaned for the field of vision of the optics 51 is much smaller than that of the rear window 3 and it is possible to spray only a few drops of cleaning liquid 8 in order to allow the cleaning of the field of vision. vision of this perspective 51.

On the other hand, the wiping system 1 further comprises an electronic control unit 13 configured to control the movement of the wiping brush 9 between its first and second positions. The electronic control unit 13 is also configured to control the spraying of cleaning liquid 8 as a function of the position of the wiper blade 9.

First embodiment:

Referring to Figures 1 to 3C, there is shown the wiping system 1 according to a first particular embodiment. According to this first particular embodiment, the spray device 7 is adapted to be mounted on a body element 11 of the motor vehicle. In general, such a sprinkler device 7 is arranged in a body element arranged at an upper part of the body so that the cleaning liquid 8 trickles onto the external surface 3a of the glass. rear 3 when it is projected onto the latter during the operation of the motor vehicle. According to the first particular embodiment described with reference to Figures 1 to 3C, the spray device 7 is housed inside a roof spoiler corresponding to the bodywork element 11. In addition, the optical sensor 5 is also housed in the body element 11 so that the cleaning liquid 8 trickles onto the latter as is explained in more detail later. For example, this optical sensor 5 can be housed in a trunk bar arranged just below the spoiler. According to other variants not shown here, the spray device 7 and the optical sensor 5 can be arranged at other places at the rear of the motor vehicle. For example, the optical sensor 5 can be arranged behind the rear window 3 and the spraying device at the level of a lateral upright of the boot door, this lateral upright constituting in this case the bodywork element 11.

First variant of the first embodiment:

According to a first variant of this first particular embodiment shown with reference to FIGS. 2A to 2C, the spraying device 7 comprises a projection element 71 of angled shape. The projection element 71 has an inlet 73 for the cleaning liquid 8 and a projection nozzle 75 configured to allow the projection of cleaning liquid 8. The inlet 73 and the projection nozzle 75 of the projection element 71 are separated from each other by an elbow 79. The projection nozzle 75 is movable between the rest position (represented with reference to FIG. 2A) and the extreme spray position (represented with reference to FIG. 2C) under the effect of an actuator 76. During its movement between the rest position and the extreme spray position, the projection nozzle 75 passes through the specific position for spraying the optics 51 of the optical sensor 5 (shown with reference to Figure 2B).

On the other hand, the wiping system 1 can comprise the electronic control unit 13 configured to control the actuator 76. According to a variant not shown here, the actuator 76 can be controlled directly by a user of the motor vehicle, for example using the commodo controlling the spraying of cleaning liquid 8 onto the rear window 3. According to this first variant, the projection nozzle 75 is configured to spray cleaning liquid 8 towards the optics 51 of the sensor optical 5 when it is in its specific spraying position and for spraying cleaning liquid 8 onto the external surface 3a of the rear window 3 when it is in its extreme spraying position.

With reference to FIG. 2A, the spraying device 7 is housed inside the bodywork element 11 when the spray nozzle 75 occupies its rest position. Such an arrangement of the spraying device 7 can in particular make it possible to prevent blockage. possible projection nozzle 75 related to the projection of solid dirt for example. When the spray device 7 is in its rest position, the spraying of cleaning liquid 8 by the spray nozzle 75 is prevented.

Referring to Figure 2B, the spray device 7 is shown when the spray nozzle 75 occupies its specific spray position. When the projection nozzle 75 is in this position, it is directed so as to spray cleaning liquid 8 towards the optics 51 of the optical sensor 5. Furthermore, such an arrangement of the projection device 7 allows the cleaning liquid 8 to run at least partially on the external surface 3a of the rear window 3, which makes it possible to limit the consumption of cleaning liquid 8. In order to pass into this specific spraying position, the projection nozzle 75 is moved in a translational movement. On the other hand, in order to allow the projection of cleaning liquid 8 towards the optics 51 of the optical sensor 5 and also towards the external surface 3a of the rear window 3, the projection nozzle 75 is oriented at least partially towards the external surface 3a of the rear window 3.

Referring to Figure 2C, there is shown the spray nozzle 75 when it occupies its extreme spray position. In the extreme spraying position, the cleaning liquid 8 is sprayed onto the external surface 3a of the rear window 3. In order to allow the projection nozzle 75 to pass from its specific spraying position (shown with reference to the figure) 2B) in its extreme spraying position, the projection nozzle 75 is moved in a translational movement in a direction identical to that allowing passage of the projection nozzle 71 from its rest position to its specific spraying position under the effect of the actuator 76. Thus, according to this first variant shown with reference to FIGS. 2A to 2C, the projection nozzle 75 is moved in translation between the rest position and the extreme spray position passing through the position specific spraying of the optics 51 of the optical sensor 5.

According to this first variant, the actuator 76 can accommodate a telescopic channel 78 disposed between the inlet 73 and the elbow 79. This telescopic channel 78 is configured to allow the displacement of the projection nozzle 75 between its rest position and its position extreme spraying through its specific spraying position. According to this first variant, the actuator 76 can move the spray nozzle 75 by lengthening or shortening the telescopic channel 78 by varying the pressure of the liquid of cleaning 8 circulating inside the projection element 71. On the other hand, in such a case, the passage of the projection nozzle 75 from its extreme spray position towards its rest position can be carried out at using elastic return means (not shown), such as a spring. According to an alternative, the actuator 76 may comprise a motor (not shown), such as an electric motor, configured to allow

lengthening or shortening the telescopic channel 78 in order to allow the displacement of the projection nozzle 75.

Second variant of the first embodiment:

Referring to Figures 3A to 3C, there is shown the spray device 7 according to a second variant. According to this second variant, the projection element 71 has, in addition to the other elements described with reference to the first variant, a pivot link 77 disposed at the elbow 79 present between the inlet 73 and the projection nozzle 75.

With reference to FIGS. 3A and 3B, the projection nozzle 75 is shown in its rest position (FIG. 3A] and in its specific spraying position (FIG. 3B) The displacement of the projection nozzle 75 between these two positions is identical to that described with reference to the first variant, that is to say according to a translational movement during a first stage of displacement by virtue of the elongation of the telescopic channel 78 under the effect of the actuator 76 .

Referring to Figure 3C, there is shown the spray nozzle 75 when it occupies its extreme spray position. According to this second variant, the displacement of the projection nozzle 75 comprises a second displacement stage in order to allow its passage from its specific spraying position (FIG. 3B] to its extreme spraying position. This second displacement stage is performed by a pivoting movement of the projection nozzle 75 between its specific spraying position and its extreme spraying position. This pivoting movement is carried out along an axis perpendicular to a direction of extension of the projection nozzle 75 by so as to move the projection nozzle 75 away from the external surface 3a of the rear window 3 when the projection nozzle 75 passes into its extreme spraying position. This pivoting movement, for example can be caused by a variation in the pressure of circulation of the cleaning liquid 8 in the projection element 71. Alternatively or in addition, this movement pivoting can be allowed by the actuator 76 when the latter is in the form of a motor, such as for example an electric motor. The pivoting of the projection nozzle 75 can be controlled by the electronic control unit 13.

Furthermore, according to an embodiment not shown here of these first and second variants, the rest position and the specific spray position of the projection nozzle 75 can be confused. In such a case, the spray device 7 is able to move only between its specific spray position and its extreme spray position either in translation or in pivoting.

Second embodiment:

Referring to Figures 4 to 5B, there is shown the wiping system 1 according to a second particular embodiment. According to this second particular embodiment, the spraying device T is carried by the wiping brush 9. In fact, there are currently wiping brushes 9 configured to spray cleaning liquid 8 onto the glass that they sweep during the movement of this wiper blade 9 between its first and its second positions.

On the other hand, and generally, the wiper blade 9 has a first 91 and a second 93 longitudinal ends. The first longitudinal end 91 is conventionally connected to a body element 11 using a guide arm 95 and the second longitudinal end 93 is free. The guide arm 95 is set in motion by the drive motor so as to allow the displacement of the wiper blade 9 between its first and second positions so that the latter sweeps at least partially the external surface 3a of the rear window 3. According to the different variants shown with reference to FIGS. 4 to 5B, the wiper blade 9 is moved on the external surface 3a of the rear window 3 in a semi-circular movement, as symbolized by the stroke C of the second free end 93 illustrated in FIGS. 4 to 5B. Thus, during the movement of the wiper blade 9 between its first and second positions, the spray device 7 ′ can spray cleaning liquid 8 directly onto the external surface 3a of the rear window 3.

According to a first variant shown with reference to FIG. 4, the spraying device 7 ′ comprises a pipe for supplying cleaning liquid fixed to the brush wiping 9. This cleaning liquid supply pipe extends between the first 91 and second 93 longitudinal ends of the wiping brush 9 so that the second free longitudinal end 93 of the wiping brush 9 comprises the spray device 7 'in order to spray cleaning liquid 8 towards the optics 51 of the optical sensor 5. Furthermore, this spray device 7' is also configured to spray cleaning liquid 8 onto the surface external 3a of the rear window 3 during the movement of this wiper blade between its first and second positions.

According to the particular embodiment of Figure 4, the wiping system 1 further comprises the electronic control unit 13. The electronic control unit 13 is configured to allow the projection of cleaning liquid 8 by the device d 'sprinkling 7' when the wiping brush 9 scans a predefined spraying area comprising the optics 51 of the optical sensor 5. In order to allow this projection of cleaning liquid, the electronic control unit can, for example, increase the cleaning liquid flow towards the spraying device 7 'so as to increase the outlet pressure of this cleaning liquid 8 at the second free longitudinal end 93. Furthermore, the predefined spraying zone can correspond to an angular range a less than or equal to 15 ° on either side of the optics 51 of the optical sensor 5. Thus, the spraying device 7 'can project cleaning liquid 8 towards the optics 51 of the optical sensor 5 during a continuous movement of the wiper blade 9 between its first and second positions and vice versa.

According to a variant not shown here, the predefined spraying area of the wiper blade 9 can correspond to the specific position of spraying the optics 51 of the optical sensor 5. According to this variant not shown, the electronic control unit 13 can control the stopping of the movement of the wiper blade 9 when the spraying device 7 'is aligned with the optics 51 of the optical sensor 5, this position corresponding to the specific spraying position of the optics 51 of the optical sensor 5. Typically, this stop of the movement of the wiper blade 9 is less than 5 seconds, and preferably less than 2 seconds.

Referring to Figures 5A and 5B, there is shown the second embodiment of the wiping system 1 according to another variant. According to this other variant, the spraying device 7 ′ comprises a supply line for cleaning liquid integrated into the brush. 9. In this other variant, the wiper 9 has a plurality of openings configured to allow the projection of cleaning liquid 8 onto the external surface 3a of the rear window 3 during its movement between its first and second positions. Thus, according to this other variant, the spraying device 7 'and the wiping brush 9 are combined.

According to this other variant, the wiper blade 9 can also assume a parking position as shown with reference to FIG. 5A. This position of

parking is arranged before the first position of movement of the wiper blade 9. Furthermore, the optics 51 of the optical sensor 5 is arranged between the parking position and the first position of the wiper blade 9 so that the brush d wiping 9 sweeps the field of vision of this optic 51 when it passes into its first position.

According to the particular embodiment of Figure 5A, the optics 51 of the optical sensor 5 is covered by the wiper blade 9 when the wiper blade 9 occupies its parking position. Such an arrangement of the wiper blade 9 can, for example, make it possible to prevent premature fouling of the field of vision of this optic 51 by, for example, shielding any dirt such as dust which can be deposited in the field of vision of this optic. optics 51 during long-term parking of this motor vehicle for example. Thus, according to this particular embodiment, the optical sensor 5 is disposed in a bodywork element 11 disposed above the rear window 3 in the mounted state of the rear window 3 on the motor vehicle and the guide arm 95 is fixed on this bodywork element 11 comprising the optical sensor 5. On the other hand, still with reference to FIG. 5 A, the specific spraying position can correspond to the parking position of the wiper blade 9.

Referring to Figure 5B, there is shown the wiper blade 9 during its movement between its first and second positions. During this movement, the spray device 7 ′ can spray cleaning liquid onto the external surface 3a of the rear window 3. In order to ensure rapid wiping of the sprayed cleaning liquid, it is sprayed onto the external surface 3a in the direction of movement of the wiper blade 9.

According to the variant shown with reference to FIGS. 5A and 5B, the rest position of the spraying device 7 'corresponds to the first position of the wiper blade 9, the position extremale of spraying corresponds to the second position of the wiper blade 9, and the specific position of spraying corresponds to the parking position of the wiper blade 9.

According to a variant not shown here, the optics 51 of the optical sensor 5 can be arranged between the first and second positions of the wiper blade 9. According to this variant, the wiper blade 9 is configured to pass into the field of vision of the optic 51 so as to project cleaning liquid into the field of vision of this optic and to sweep this cleaning liquid during its movement between its first and second positions.

On the other hand, returning to the different embodiments shown with reference to Figures 1 to 5B, the electronic control unit 13 can include or be connected to image processing means (not shown) in order to analyze the various images taken by the optical sensor 5 in order to determine the presence of dirt in the field of vision of the optics 51 and to determine the need to implement a step of cleaning the field of vision of this optics 51.

The various embodiments described above are examples provided by way of illustrative and nonlimiting example. Indeed, it is entirely possible for a person skilled in the art to use such a wiping system 1 and in particular a mobile spraying device 7, 7 ′ with a wiping brush 9 moving on the rear window 3 in a translational movement. Furthermore, a person skilled in the art can envisage other types of movement for the projection nozzle 75 than translational and pivoting movements without departing from the scope of the invention as long as the projection nozzle 75 passes through a specific spray position.

Thus, obtaining a wiping system 1 allowing both cleaning of an external surface 3a of a rear window 3 and of the optics 51 of an optical sensor 5 is possible thanks to the system of wiping 1 described above. In particular, the mobility of the spray device 7, 7 'passing through a specific spray position allows cleaning of the optics 51 of the optical sensor 5 using the same spray device 7, 7' as that used for cleaning the rear window 3, which in particular makes it possible to reduce the costs associated with cleaning this lens 51 and also the consumption of cleaning liquid 8 for cleaning this lens 51 and the external surface 3a of the rear window 3 .

Claims

1. Wiping system (1) of a rear window (3) of a motor vehicle having at least one optical sensor (5) comprising an optic (51), said wiping system (1) having:

a spray device (7, 7 ') configured to spray at least part of an external surface (3a) of the rear window (3) with a cleaning liquid (8), at least one wiper blade ( 9) intended to be placed in contact with the external surface (3a) of the rear window (3), said wiper blade (9) being configured to be moved on this external surface (3a) between a first and a second position in order to at least partially wipe this external surface (3a), and

a wiper drive motor (9) configured to allow the wiper blade (9) to move between its first and second positions,

characterized in that the spray device (7, 7 ') is movable between a rest position and an extreme spray position, and in that the movement of the spray device (7, 7') has at least a specific position for spraying the optics (51) of the optical sensor (5), in which the cleaning liquid (8) is intended to be projected towards the optics (51) of the optical sensor (5).

2. Wiping system (1) according to the preceding claim, characterized in that it

further comprises an electronic control unit (13) configured to control the movement of the wiper blade (9) between its first and second positions and to control the spraying of cleaning liquid (8) as a function of the position of the brush d 'wiping (9).

3. Wiping system (1) according to one of the preceding claims, characterized in that the spray device (7) is adapted to be mounted on a body element (11) of the motor vehicle.

4. wiping system (1) according to claim 3, characterized in that the spray device (7) comprises a projection element (71) of angled shape having an inlet (73) for the cleaning liquid (8) and a projection nozzle (75) oriented at least partially towards the external surface (3a) of the rear window (3) and configured to allow the projection of liquid from cleaning (8), said projection nozzle (75) being movable between the rest position and the extreme spray position passing through the specific optical spray position (51) of the optical sensor (5) under the effect of an actuator (76).

5. Wiping system (1) according to claim 4, characterized in that the nozzle

projection (75) is moved in translation between the rest position and the extreme spray position by passing through the specific optical spray position (51) of the optical sensor (5).

6. wiping system (1) according to claim 4, characterized in that the projection element (71) has a pivot connection (77) disposed at a bend (79) present between the inlet (73 ) and the projection nozzle (75), and in that the displacement of the projection nozzle (75) comprises a first step of displacement in translation of the projection nozzle (75) between its rest position and its specific position d spraying and a second step of pivoting movement of the projection nozzle (75) between its specific position for spraying the optics (51) of the optical sensor (5) and its extreme spraying position, said pivoting movement being produced along an axis perpendicular to a direction of extension of the projection nozzle (75) so as to move the projection nozzle (75) away from the external surface (3a) of the rear window (3).

7. Wiping system (1) according to one of claims 1 or 2, characterized in that the spraying device (7 ') is carried by the wiping brush (9).

8. Wiping system (1) according to claim 7 taken in combination with the

claim 2, characterized in that the electronic control unit (13) is configured to allow the projection of cleaning liquid (8) by the spraying device (7 ') when the wiper blade (9) sweeps a predefined spraying area comprising the optics (51) of the optical sensor (5).

9. Wiping system (1) according to claim 8, characterized in that the predefined spraying zone corresponds to an angular range (a) less than or equal to 15 ° on either side of the optics (51 ) of the optical sensor (5).

10. Wiping system (1) according to claim 8, characterized in that the zone

predefined spraying of the wiper blade (9) corresponds to the specific position of spraying the optics (51) of the optical sensor (5).

11. Wiping system (1) according to claim 10, characterized in that the unit

electronic control (13) controls the stopping of the movement of the wiper blade (9) when the spraying device (7 ') is aligned with the optics (51) of the optical sensor (5), this position corresponding to the specific position for spraying the optics (51) of the optical sensor (5).

12. Wiping system (1) according to any one of claims 7 to 11, characterized in that the optics (51) of the optical sensor (5) is arranged between the first and second positions of the wiping brush ( 9) and in that the wiper blade (9) has a plurality of openings configured to allow the projection of cleaning liquid (8) onto the external surface (3a) of the rear window (3) during its displacement between its first and second positions.

13. Wiping system (1) according to claim 12, characterized in that the brush

wiping (9) further comprises a parking position disposed before the first position of movement of the wiper blade (9) and in that the optics (51) of the optical sensor (5) is disposed between the position of parking and the first position of the wiper blade (9).