WO2013182488A1

WO2013182488A1 - System for wiping and washing a vehicle window

Info

Publication number: WO2013182488A1
Application number: PCT/EP2013/061276
Authority: WO
Inventors: Philippe BILLOT
Original assignee: Valeo Systemes D'essuyage; Sakai, Izumi; Dias, Dominique; CAILLOT, Gérald
Priority date: 2012-06-04
Filing date: 2013-05-31
Publication date: 2013-12-12
Also published as: FR2991261A1; FR2991261B1

Abstract

The invention relates to a system (1) for wiping and washing a vehicle window (4), including at least one blade (3) for wiping the window (4), which is set in motion thereon by an actuating unit (5), said wiper blade (3) including at least a first device (10) for spraying a washing liquid onto the window, said wiper blade (3) moving from a first end position (17) to a second end position (18) by moving in a first direction (16), characterized in that the system (1) includes a means (14) configured to control a spraying of the washing liquid via the first spraying device (10) in a second direction opposite from the first direction (16) of the wiper blade (3) movement. The invention likewise relates to a method for wiping and washing a vehicle window by means of at least one wiper blade.

Description

SYSTEM FOR WIPING AND WASHING A GLASS OF A VEHICLE

The technical sector of the present invention is that of wiping systems and washing a window of a vehicle, especially automobile. Such a system is more particularly intended to be installed on a windshield of this vehicle.

Automobiles are commonly equipped with a wiper system to wipe the windshield and to prevent the driver's vision from being disturbed. Such an installation generally comprises two wiper blades which scrape the outer surface of the windshield so as to evacuate outside the field of view of the driver the water present on this surface.

It is also known to equip this vehicle with a washing installation arranged to project a liquid on the windshield, so as to facilitate the dissolution of dirt, and thus increase the quality of cleaning of the windshield. This washing installation then comprises at least two separate nozzles installed on a hood of the vehicle, one of these nozzles being dedicated to watering

20 of an area of the windshield located in front of the driver of the vehicle, while the other nozzle is assigned to watering an area of the windshield located in front of the front passenger vehicle.

In an improved version, a wiper has been proposed which has its own washing liquid spraying element. The disadvantage of such a broom lies in the proximity between the liquid projection element and the blade that scrapes the windshield. Indeed, such proximity complicates the projection of liquid and limits its effectiveness, the latter being largely dependent on the time allocated to the liquid to dissolve the dirt present on the windshield. This time is determined by the distance between the scraper blade and the area upstream of the wiper blade where the liquid is deposited. Thus, the closer the projection element to the scraper blade is, the less liquid has time to dissolve these soils. The washing system therefore lacks efficiency.

The object of the present invention is thus to overcome the disadvantages described above by increasing the laying time of the liquid so as to effectively dissolve the dirt on the windshield.

For this purpose, the subject of the invention is a system for wiping and washing a window of a vehicle, comprising at least one wiper for wiping the window 10 placed in motion thereon by a set actuating device, said wiper blade comprising at least a first projection device on the window of a washing liquid, said wiper blade moving from a first terminal position to a second terminal position by effecting a movement in a first sense and from the second terminal position towards

The first end position by moving in a second direction opposite the first direction, characterized in that the system comprises means configured to control a projection of the washing liquid by the first projection device in the second direction, when the broom wiper moves in the first direction.

20

Thus, by watering the windshield downstream of the wiper blade, that is to say on a windshield area that the wiper has just traveled, the liquid has a time at least equal the time required to effect movement of the wiper blade, which effectively dissolves dirt on the windshield.

According to an example of the invention, the first projection device is installed on the wiper blade so as to project the washing liquid in the second direction, when the wiper blade moves in the first direction. This first projection device extends in particular along the wiper blade, and on the side of the latter. Advantageously, the wiper blade comprises a second projection device on the window of the washing liquid, the means being configured to control a projection of the washing liquid by the second projection device in the first direction, when the wiper blade moves in the first sense. This second projection device is distinct from the first projection device. It extends along the wiper blade, being attached to one side thereof opposite the side of the wiper blade which receives the first projection device. According to an exemplary embodiment, the means is configured to control a projection of washing liquid by the second projection device in the first direction, when the wiper blade moves in the second direction.

Thus, the second projection device is installed on the wiper blade 15 so as to spray the washing liquid in the first direction, when the wiper blade moves in the second direction.

In one embodiment of the invention, the means is configured to simultaneously control a spraying of washing liquid by the first spraying device and the second spraying device.

The means may be configured to control that a quantity of washing liquid projected by the first projection device is greater than a quantity of washing liquid projected by the second projection device 25 during the movement of the wiper blade according to the first meaning.

Alternatively or in a complementary manner, the system may be arranged so that the movement in the first direction has a speed of movement of the wiper blade lower than a speed of movement of the wiper blade operated in the second direction.

In such a situation, the speed of movement of the wiper blade in the first sense is less than 0.1 radian / s. Such a speed corresponds to a time of 2.5 seconds for the wiper blade to move from the first end position to the second end position.

Alternatively or additionally, the system may be arranged to implement an immobilization time of the wiper blade between the movement in the first direction and the movement in the second direction, for example at the level of one or the other of the terminal positions. According to an example of application, the movement in the first direction may correspond to an upward movement of the wiper blade, while the movement in the second direction corresponds to a downward movement of the wiper blade.

According to another example of application, the movement in the first direction corresponds to a downward movement of the wiper blade, while the movement in the second direction corresponds to an upward movement of the wiper blade.

The system according to the invention may comprise a device for heating the washing liquid.

According to an exemplary embodiment of the invention, the first projection device and / or the second projection device may take the form of a duct formed in a component of the wiper blade, said duct extending along the wiper blade, said component comprising a plurality of projection orifices in communication with the conduit. In such a case, the projection orifices may extend in a direction perpendicular to, or substantially perpendicular to, the direction of extension of the duct.

30

The invention also relates to a method of wiping and washing a window of a vehicle which can be implemented by a system comprising one any of the features detailed above. In this method, the system comprises at least one wiper blade with at least one first device for spraying a liquid for washing the glass. The wiper blade is moved on the window by an actuating assembly.

According to the basic process:

- activating the actuating assembly for driving the wiper blade on the glass in a movement in a first direction,

- A projection of the washing liquid is activated by the first projection device so as to project said washing liquid in a second direction opposite to the first direction of movement of the wiper blade.

Additionally, the method can:

- activate the actuating assembly to drive the wiper blade on the window according to the movement in the second direction after activating the actuating assembly to drive the wiper blade on the window according to the movement in the first meaning,

setting or determining a speed of movement of the wiper blade in the first direction to a value lower than a speed of movement of the wiper blade in the second direction.

Prior to activation of the step of actuating the wiper blade, the method can verify that the speed of the vehicle is less than or equal to 5 km / h before activating the projection of the washing liquid by the first device projection so as to project said washing liquid in the second opposite direction to the first direction of movement of the wiper blade.

Particle dissolution is favored when the process implements a step of immobilizing the wiper blade between the movement in the first direction and the movement in the second direction during a period of time. determined non-zero.

Optionally, the method may implement a step during which the washing liquid is heated prior to its projection.

5

The wiper blade may include a second projection device. In such a case, the method comprises a step in which the simultaneous washing liquid is sprayed by the first projection device and by the second projection device, so as to project said washing liquid from one side to the other. of the wiper blade, that is to say both in the direction of movement of the wiper blade and in the opposite direction to the direction of movement of the wiper blade.

According to an additional step, the method can project an amount of washing liquid by the first projection means larger than a quantity of liquid projected by the second projection means during the movement of the wiper blade in the first direction.

A first advantage according to the invention lies in the extension of the time given to the washing liquid to dissolve the dirt present on the glass. The cleaning by the wiper blade is thus facilitated and the service life of the scraper blade of the wiper blade is lengthened, since the latter does not encounter a solid body, likely to damage it.

Another advantage lies in the possibility of implementing a method of prewashing the windshield before the driver begins his journey with the vehicle.

Other characteristics, details and advantages of the invention will emerge more clearly on reading the description given below as an indication in relation to drawings in which: FIG. 1 is a perspective view of a motor vehicle incorporating an exemplary embodiment of the system for wiping and washing a window of this vehicle, according to the invention,

FIG. 2 is a schematic view illustrating an embodiment of the wiping and washing system according to the invention,

FIG. 3 is a schematic view illustrating a first variant embodiment of the wiping and washing system according to the invention,

- Figure 4 is a schematic view illustrating a second embodiment of the wiper system and washing according to the invention.

FIG. 1 illustrates a wiper and washing system 1 installed on a motor vehicle 2. The wiper system according to the invention comprises at least one wiper blade 3 which, when mounted on the vehicle, is The windshield 4 mentioned here is an example of a window wiped by the wiper and washing system according to the invention, but it goes without saying that this glass can for example be a rear window of the vehicle, a headlight glass of such a vehicle, and generally any window of a motor vehicle whose surface is wiped by a wiper system.

The wiper blade 3 is set in motion on the windshield 4 of the vehicle by an actuating assembly 5. These terms generally include all or part of the components necessary for the transformation of an electrical energy into a rotational movement for a wiper system. The actuation assembly can thus comprise at least one of the following components:

an electric motor 6, advantageously electronically, responsible for transforming the electrical energy into a rotational movement,

a speed reducer 7, responsible for adapting the speed of rotation of the electric motor to the speed of rotation of the wiper blade

3 on the windshield 4,

a linkage mechanism 8, responsible for transmitting the rotational movement at the output of the gearbox,

at least one brush holder 9, connected on the one hand to a rotary drive shaft provided with the linkage mechanism and on the other hand to the wiper blade 3.

5

In the example illustrated in FIG. 1, the actuating assembly 5 comprises two brush holders each connected to a wiper blade, the linkage mechanism 8 then being arranged to transmit the rotational movement coming from the gear reducer. speeds with two separate drive shafts, each of them being secured to a brush holder.

The wiper blade 3 is for example of the flat blade type, that is to say comprising at least one squeegee pressed against the windshield 4, one or more stiffening vertebrae connected to the squeegee and which extend along it, and a central single fastener made by a mechanical connector connected to one end of the brush holder 9. Such flat blade may also include a solid air deflector for example of the squeegee and arranged to exploit the dynamic effect of the movement of the vehicle to increase the support force of the wiper blade 3 on the windshield 4.

20

The wiper blade 3 also comprises at least one device for projecting a washing liquid from the windshield. Such a projection device is hereinafter referred to as the first liquid projection device referenced 1 0. In general, a projection device used in the system according to the invention extends along the wiper blade. , in the longitudinal direction of extension of the wiper blade, and comprises a plurality of projection orifices arranged to project the washing liquid at least perpendicular to the longitudinal direction in which it extends.

According to an exemplary embodiment, it can act as a projection ramp manufactured separately from the wiper blade 3, and reported on the latter. Such a projection ramp can be made integral with the brush holder 9. According to another embodiment shown in the figures, the first projection device 10 may be formed by a duct integrated in the wiper blade 3, and which runs along the longitudinal direction of the latter. According to an exemplary embodiment, such a duct may be formed in the air deflector. Alternatively, the conduit may be formed in the squeegee. In all cases, the conduit communicates with the projection orifices formed in the baffle or in the squeegee, the latter being distributed along the duct so as to spray washing liquid all along the wiper blade 3.

The first device 10 for spraying the liquid is supplied by a transport device 11 of the windshield washing liquid 4. According to one embodiment example, such a device for transporting the liquid 1 takes the form of a or several pipes which channel the washing liquid from at least one tank 12 installed for example in a front compartment of the vehicle to the wiper blade 3, more particularly to the projection device incorporated in the wiper blade 3. The washing liquid is in particular circulated in the liquid transport device 1 1 by at least one pump 13 integral with the reservoir 12.

The liquid transport device 1 1, the pump 13 and optionally the reservoir 12 form a washing liquid supply assembly.

On the windshield 4, the wiper blade 3 moves between two end positions. A final position constitutes a position where the direction of movement of the wiper blade is reversed. According to an exemplary embodiment, a first end position is constituted by a rest position of the wiper blade 3 on the windshield 4, where the latter extends along a horizontal axis, or substantially horizontal, along a windshield bay near the vehicle hood. In such a case, the second end position is constituted by a position of the wiper blade 3 on the windshield 4 substantially aligned on a vertical axis and close to a vehicle upright on which the windshield 4 is posed.

The invention also covers an inverse situation in which the first end position of the wiper blade 3 is substantially aligned with the vertical axis and close to the vehicle post on which the windshield 4 is placed.

In this case, the second end position is the rest position of the wiper blade mentioned above.

The wiper blade 3 rotates about an axis passing through the end of the brush holder 9 integral with the drive shaft.

When moving from the first end position to the second end position, the wiper blade 3 moves in a first direction, also called upward movement. Once the second end position is reached, the rotational movement of the wiper blade 3 is reversed and the wiper blade 3 then moves in a second direction which is opposite to the first direction, this second direction then being called a downward movement.

The wiper and washing system 1 according to the invention may also comprise a device 15 for heating the washing liquid. The latter may for example be incorporated in the reservoir 12. Alternatively, it may be placed at any location of the liquid transport device 1 1, for example so as to surround a portion of the pipe forming this transport device.

The wiper and washing system 1 according to the invention also comprises a means 14 configured to control a spraying of the washing liquid by the first spraying device 10 in the second direction of the rotational movement of the wiper blade 3, opposite to the first direction of movement of this wiper blade. The first projection device 10 is thus arranged on the wiper blade so as to project the washing liquid downstream of the wiper blade. In other words, the projection is organized so as to deposit the washing liquid on the part of the windshield 4 which has just been traversed by the wiper blade during its movement between the first terminal position and the second terminal position.

According to an exemplary embodiment, the means 14 is electrically connected to the actuating assembly 5, in particular the electric motor 6, so as to activate the movement of the wiper blade 3. The means 14 controls the activation of the wiper blade. set of washing liquid supply. More specifically, the means 14 controls the start-up and shutdown of the circulation pump 13, so as to operate the projection of the liquid on the windshield 4 downstream of the blade, according to its direction of rotation.

The means 14 may also be electrically connected to the heating device 1 5, so as to control the heating of the washing liquid at least prior to its projection. The means 14 takes the form of a servitude housing adapted to equip the vehicle. Such a service housing is for example a computer capable of performing several vehicle equipment control functions, one of these functions being at least dedicated to the control of the liquid supply assembly, in particular to the control of the pump 13.

Figure 2 shows schematically the wiper and washing system 1 according to the invention. The wiper blade 3 makes a movement on the windshield 4 in the first direction, illustrated by an arrow referenced 1 6. This first direction 16 is here an upward movement of the wiper blade 3 from its first end position 17 to its second end position 1 8. The projection device 10 is installed laterally on the wiper blade 3 and projects the washing liquid in the direction illustrated by the arrows 19 corresponding to the second direction, that is to say a opposite direction to the upward movement. This projection device 10 is hydraulically connected to the transport device 11 of the washing liquid.

According to one embodiment of the invention, the wiper and washing 1 is arranged so that the movement of the wiper blade 3 in the first direction 16 has a lower speed of displacement than a movement speed of the same wiper blade 3 when it is operated in the second direction. In other words, the upward movement of the wiper blade 5 is slower than the downward movement of the wiper which occurs immediately after the upward movement. This increases the deposition time of the washing liquid on the windshield, which facilitates the dissolution of dirt.

According to an exemplary embodiment, the speed of movement of the wiper blade 0 in the first direction, for example upward movement, is less than 0.1 radian / s, or 36 s. Such a speed corresponds to a time of 2.5 seconds for the wiper blade 3 to move from the first end position 17 to the second end position 18. It will be noted that the management of the movement speed in the first direction can be effected by the means, referenced 14 in FIG. 1, which manages the liquid projection as a function of the direction of rotation of the wiper blade 3.

Alternatively or in addition to this management of the speed of movement of the wiper blade, the wiper and washing system 1 according to

The invention is arranged to implement a time of immobilization of the wiper blade 3 after the projection operation which takes place in the opposite direction to the first direction. According to an exemplary embodiment, this function is implemented by the means referenced 14 in FIG. The immobilization of the wiper blade 3 can intervene between the movement according to the first direction and the movement according to

The second direction, that is to say at the first end position 17 or the second end position 18 of the wiper blade 3. In the situation where the first direction corresponds to an upward movement of the wiper blade 3, the immobilization time of this wiper blade is operated when it is at the second terminal position 18. For example, this time is

Between 1 and 10 seconds, this time of immobilization being measured between the moment when the wiper blade 3 stops at the second terminal position 18 and the moment when this wiper blade leaves this second position terminal, to operate the downward movement.

Figure 3 shows a first embodiment of the wiper and washing system 1 according to the invention. Compared to the embodiment of FIG. 2, this first embodiment illustrates the case where the first direction of movement of the wiper blade is a downward movement, while the second direction corresponds to an upward movement.

The wiper blade 3 comprises the first projection device 10 installed on one side of the wiper blade oriented towards the second terminal position. The first direction of movement of the wiper blade corresponds to a downward movement from the second terminal position 18 to the first end position 17. According to the invention, the means, referenced 14 in FIG. 1, controls the washing liquid supply assembly so as to supply the latter to the projection device 10. This projection device 10 then projects the liquid on the windshield 4 in the second direction, that is to say a direction opposite to the downward movement of the wiper blade 3, such a projection being illustrated in this figure by the arrows referenced 19.

20

The additional functions detailed with reference to FIG. 2 are of course transposable to this first embodiment illustrated in FIG. 3. For example, the speed of the downward movement may be less than the speed of the upward movement of the wiper blade 3. Alternatively or additionally, the system according to the invention can operate an immobilization time intervening when the wiper blade is in its first end position 17.

FIG. 4 shows a second variant embodiment of the wiper and washing system 1 according to the invention. According to this variant, the wiper blade 3 comprises a first projection means 10 mounted on one side of this broom, and a second projection means 20 mounted on one side of the broom wiper 3 opposed to the side receiving the first projection device 10. The first projection device 10 is hydraulically connected to a first pipe 21, while the second projection device 20 is hydraulically connected to a second pipe 22, these two pipes forming an exemplary embodiment of the liquid transport device 1 1.

The liquid projection ordered by the means referenced 14 in FIG. 1 is operated simultaneously by the first projection device 10 and by the second projection device 20, for example during the upward movement of the wiper blade 3, corresponding to the first sense 16.

According to this example, the first projection means 10 sprays a zone of the windshield 4 downstream of the wiper blade 3, that is to say a zone previously wiped by the wiper blade 3 during its upward movement. Simultaneously, the second projection device 20 sprays a region of the windshield 4 upstream of the wiper blade 3, that is to say an area that has not yet been swept by the broom. wiping during the upward movement.

Of course, the invention covers the use of this mode of operation during a downward movement of the wiping wiper 3. In such a case, it is the first spraying device 10 which projects the washing liquid upstream of the wiper blade. wiper blade 3, while the second wiper device 20 projects the washing liquid on an area of the windshield located downstream of the wiper blade

25 3.

Preferably, the means referenced 14 in FIG. 1 can control the washing liquid supply assembly so as to project a larger amount of this liquid onto the area of the windshield located downstream of the wiper blade 30. during an upward or downward movement.

In the case of an upward movement as shown in FIG. such control occurs for example by increasing the rotational speed of a first liquid circulation pump assigned to the pipe 21, so as to provide a greater flow of washing liquid. Alternatively or in a complementary manner, the means can order a reduction in the rotational speed of a second circulation pump assigned to the second pipe 22, compared to the speed of rotation of the first pump.

According to an exemplary embodiment applicable to any of the embodiments detailed above, the wiping and washing system may comprise a washing liquid supply assembly comprising two separate tanks, provided with one and / or the other of a device for heating the washing liquid. In such a situation, one of the tanks is associated with the function implemented by the object of the main claim, while the other tank is associated with a conventional wash of the windshield.

15

The description below is intended to describe a method of wiping and washing a window, for example implemented by the wiper and washing system described above.

Such a method makes use of at least one wiper blade 3 comprising at least a first projection device 10 of a glass washing liquid and set in motion on the pane 4 by an actuating assembly 5. In a first step, the actuating assembly 5 is activated to drive the wiper blade 3 on the pane 4 in a movement in a first direction 16,

Corresponding for example to an upward movement of the wiper blade 3.

During this movement in the first direction, a projection of the washing liquid is activated by the first projection device 10 so as to project the washing liquid in a second direction, the latter being opposite the first direction of the movement of the wiper. wiping 3. In the case where the movement in the first direction is an upward movement, the movement in the second direction is a downward movement. As mentioned in the description below above, the reverse is also covered by the method according to the invention. Such a projection is effected for example by a control of the washing liquid circulation pump constituting the supply assembly.

Prior to the activation step of the actuating assembly 5, the method may comprise a step of determining the state of the windshield 4, such a step being decisional to implement the method according to the invention. invention. To do this, the wiper and washing system 1 according to the invention may comprise a dirt sensor adapted to be installed on the windshield 4, such a sensor being electrically connected to the means 14 to allow the implementation process.

After ordering the rotation of the wiper blade 3 in the first direction 16, the method comprises a step during which the assembly is activated.

15 to drive the wiper blade on the window according to the movement in the second direction. The method thus orders a reciprocating movement of the wiper blade 3. According to a step complementary to the method, the means 14 fixes a speed of movement of the wiper blade 3 in the first direction to a value less than one. speed of movement of the wiper blade 3 according to

20 the second meaning. For example, the rise of the wiper blade is thus slower than the descent of the same wiper blade during a back-and-forth movement. Such a step may be placed under the control of a step of determining the state of the windshield, in particular by the dirt sensor.

According to an alternative or additional example of implementation of the method, it is possible to provide a step during which the wiper blade 3 is immobilized between the movement in the first direction and the movement in the second direction for a period of time. determined non-zero. This immobilization occurs when the wiper blade 3 is in its second

30 terminal position, for example along the amount of veh icule when the movement in the first sense is an upward movement. According to an additional step, for example depending on the dirt sensor, it is possible to adapt this downtime according to the state of the windshield, for example by increasing the downtime on the windshield if it is considered particularly dirty. Such an adaptation can be manual. It can also be automatic, that is to say resulting from a determination by the soil sensor.

In the case where the wiper blade 3 comprises a first projection device 10 and a second projection device 20, the method according to the invention can activate a projection of the simultaneous washing liquid by the first projection device 10 and by the second projection device 20, so as to project said washing liquid on either side of the wiper blade 3. The method thus makes it possible to spray washing liquid upstream and downstream of the wiper blade 3 during its upward movement, for example.

15

In such a situation, the method according to the invention comprises a step during which a larger quantity of liquid is applied to the area of the windscreen located downstream of the wiper blade, ie the zone sprayed by the first projection device 10 during an upward movement. This larger quantity 2 is illustrated in FIG. 4 by trios of arrows 19.

Prior to any of the steps of the method detailed above, it may comprise a step of activating a heating device, in particular electric, of the washing liquid.

25

The steps mentioned above can be managed by means 14.

The method according to the invention may be a wiping and washing process before the departure of the vehicle. Since the vision of the driver can be disturbed by the spraying of washing liquid downstream of the movement of the wiper blade 3 on the windshield, the method includes a step of authorizing implementation of this method. Such a step verifies that the speed of the vehicle is less than or equal to 5 km / h before activating the projection of the washing liquid by the first projection device 10 in the direction opposite to the direction of movement of the wiper blade 3. According to one example, the method may be the vehicle is switched on and interrupted as soon as the vehicle exceeds 5 km / h.

Note that the soil sensor can both authorize or prohibit the implementation of the method according to any of the steps explained above, and also determine the use of additional steps such as fixing the speed the wiper blade in the first direction, the time of immobilization, the amount of washing liquid projected by the first and / or the second projection device, and / or the activation of the washing liquid heating device.

In the entirety of the above description, the meaning of the opposite term used to define the direction of washing liquid spraying with respect to the direction of movement of the wiper blade is not strict. It is understood here that the projection can spread in an angular sector at most equal to 180 °, the base of this angular sector being parallel to the longitudinal direction in which the wiper blade extends.

Claims

1. System for wiping and washing (1) a window (4) of a vehicle, comprising at least one wiping blade (3) for the window (4) placed in

5 movement thereon by an actuation assembly (5), said wiping blade (3) comprising at least a first projection device (10) onto the window of a washing liquid, said wiping blade (3) moving from a first terminal position (17) to a second terminal position (18) by moving in a first direction (16) and from the second terminal position (18) to the first terminal position (17) ) by carrying out a movement in a second direction opposite to the first direction (1 6), characterized in that the system (1) comprises means (14) configured to control a projection of the washing liquid by the first projection device (10 )

15 in the second direction, when the wiper blade (3) moves in the first direction.

2. System according to claim 1, in which the wiper blade (3) comprises a second projection device (20) onto the liquid window

20 washing, the means (14) being configured to control a projection of the washing liquid by the second projection device (20) in the first direction, when the wiping blade moves in the first direction.

3. System according to claim 2, in which the means (14) is configured to control a projection of washing liquid by the second projection device (20) in the first direction (16), when the wiping blade ( 3) moves in the second direction.

4. System according to any one of claims 2 or 3, wherein the means (14) is configured to control a projection of washing liquid simultaneously by the first projection device (10) and by the second projection device (20).

5. System according to claim 4, in which the means (14) is configured so that a quantity of washing liquid projected by the first projection device (10) is greater than a quantity of washing liquid projected by the second projection device (20) during the movement of the wiper blade (3) in the first direction (16). î o

6. System according to any one of the preceding claims, in which the movement in the first direction (16) has a speed of movement of the wiper blade (3) lower than a speed of movement of the wiper blade (3) operated in the second sense.

7. System according to claim 6, in which the speed of movement of the wiper blade (3) in the first direction (16) is less than 0.1 radian/second.

8. System according to any one of the preceding claims, arranged to implement an immobilization time of the wiper blade (3) between the movement in the first direction (16) and the movement in the second direction.

9. System according to any one of the preceding claims, in which the movement in the first direction (16) corresponds to an upward movement of the wiper blade (3), while the movement in the second direction corresponds to a movement descending from the wiper blade (3).

10. System according to any one of claims 1 to 8, in which the movement according to the first direction (16) corresponds to a downward movement of the wiper blade (3), while the movement according to the second direction corresponds to an upward movement of the wiper blade (3).

11. System according to any one of the preceding claims, comprising a device for heating (15) the washing liquid.

12. System according to any one of the preceding claims, in which the first projection device (10) and/or the second projection device (20) takes the form of a conduit formed in a component of the wiper blade ( 3), said conduit extending along the wiper blade (3), said component comprising a plurality of projection orifices in communication with the conduit.

13. Method for wiping and washing a window (4) of a vehicle by means of at least one wiper blade (3) comprising at least a first projection device (10) of a cleaning liquid washing the window and set in motion on the window (4) by an actuation assembly (5), in which:

- the actuation assembly (5) is activated to drive the wiper blade (3) on the window (4) in a movement in a first direction (16),

- a projection of the washing liquid is activated by the first projection device (10) so as to project said washing liquid in a second direction opposite to the first direction (16) of the movement of the wiper blade (3).

14. Method according to claim 13, in which:

- the actuation assembly (5) is activated to drive the wiper blade (3) on the window (4) according to the movement in the second direction after having activated the actuation assembly (5) to drive the wiping blade (3) on the window (4) according to the movement in the first direction (16), - a speed of movement of the wiper blade (3) in the first direction (16) is fixed at a value lower than a speed of movement of the wiper blade (3) in the second direction.

15. Method according to any one of claims 13 or 14, in which it is checked that the speed of the vehicle is less than or equal to 5 km/h before activating the projection of the washing liquid by the first projection device (10). ) so as to project said washing liquid in the second direction opposite to the first direction (16) of the movement of the wiper blade (3).

16. Method according to any one of claims 13 to 15, in which the wiping blade (3) is immobilized between the movement in the first direction (16) and the movement in the second direction for a determined time.

17. Method according to any one of claims 13 to 16, where the wiper blade (3) comprises a second projection device (20), in which a simultaneous projection of the washing liquid is activated by the first projection device (10) and by the second projection device (20), so as to project said washing liquid on either side of the wiping blade (3).

18. Method according to claim 17, in which a quantity of washing liquid is projected by the first projection means (10) greater than a quantity of liquid projected by the second projection means (20) during the movement of the broom wiping blade (3) in the first direction (16).