WO2024126411A1

WO2024126411A1 - Device for cleaning a glazed surface

Info

Publication number: WO2024126411A1
Application number: PCT/EP2023/085197
Authority: WO
Inventors: Frederic Bretagnol; Matthieu Combeau
Original assignee: Valeo Systèmes d'Essuyage
Priority date: 2022-12-14
Filing date: 2023-12-11
Publication date: 2024-06-20

Abstract

The invention proposes a device for cleaning a glazed surface of a detection device in a vehicle, comprising a nozzle supplied with liquid cleaning product, and having a spray head diffusing the liquid in the form of a jet, said spray head having a closed end. Said spray head comprises at least one spray wall provided with at least one hole through which a straight jet exits.

Description

Cleaning device for glass surface

Technical field of the invention

The present invention relates to the field of driving assistance devices and, more particularly, to the field of optical detection systems used for this purpose.

The invention relates more particularly to cleaning devices configured for cleaning an optical sensor of such an optical detection system.

Technical background

An optical detection system is any system comprising optical sensors such as cameras, laser sensors or other sensors based on the emission and/or detection of light in the visible or invisible spectrum for humans, in particular the 'infrared.

Such optical detection systems are equipping an increasing number of motor vehicles in order either to help the driver of the vehicle in certain driving situations, one of which is well known, is parking assistance, or to make autonomous or partly autonomous driving of the vehicle.

The driving assistance devices may include detection devices which may take the form, for example, of sensors intended to evaluate an environment outside the motor vehicle, or even in the form of a camera intended to offer the driver visibility of an environment outside the vehicle. motor vehicle, visually inaccessible in the driver's seat. Such detection devices then comprise at least one glazed surface positioned within the vehicle such that it is capable of capturing the environment outside the motor vehicle, in a desired area.

For autonomy and/or driving assistance to be as effective as possible, the data provided by sensor must be of the best possible quality, and it is therefore essential to have a clean glass surface to carry out these acquisitions. of data.

To do this, a cleaning device is arranged in the vicinity of an optical detection device (for example the lens of a camera) in order to be able to project, on demand, a fluid so as to remove possible dirt deposited on the glass surface of the detection device. It could be dust or insects for example.

This cleaning is essential to provide optimal visibility to the sensor or the user of the motor vehicle.

In known manner, such a cleaning device comprises a nozzle hydraulically connected to a fluid storage tank. The fluid is ejected from the nozzle via a distribution orifice, towards the glass surface to be cleaned. The nozzle diffuses the cleaning liquid in the form of a jet.

During operation, the free end of the nozzle protrudes from the bodywork and is therefore visible from the outside of said vehicle.

It is known to use nozzles with a relatively wide jet profile, of the flat jet or cone jet type allowing a large radius of action, to sweep the entire glazed width, and therefore to clean a large surface, in the entire glass surface of the sensor to be cleaned, with a single distribution orifice.

The flat jet consists of a jet which hits orthogonally or obliquely on a deflection surface which allows the jet to be reflected flat and with a large width, like a fan.

The conical jet escapes from the cleaning device with a solid or hollow conical shape.

It is therefore possible to clean the entire surface in question using a single jet and a single nozzle. Using a single nozzle allows you to remain discreet and avoid having too many visible parts protruding from the vehicle body.

The disadvantage of this type of nozzle with flat or conical jet is the use of too large a volume of cleaning liquid. In addition, the width of the jet necessary to sweep the entire glass surface to be cleaned leads to a reduction in the impact pressure, which leads to a reduction in cleaning efficiency.

In the current context, where we wish to reduce the quantity of use of cleaning fluid, so as to take less volume of liquid into the vehicle, and so as not to waste the liquid on board, a problem arises.

The aim of the present invention is therefore to provide a cleaning device which can remain discreet and compact and which uses a lesser quantity of cleaning liquid, while offering high cleaning performance.

The invention therefore relates to a cleaning device for a glazed surface of a detection device fitted to a vehicle, comprising a nozzle supplied with liquid cleaning product, and having a spray head diffusing the liquid in the form of a jet, said sprinkler head having a closed end.

The invention is mainly characterized in that said sprinkler head comprises at least one sprinkler wall provided with at least one hole through which a straight jet emerges.

The detection device and the cleaning device may be those of a driving assistance device housed within a motor vehicle. For example, the detection device can be a camera or a sensor making it possible to increase the visibility of a user of the motor vehicle on the external environment of said vehicle. Each camera or each sensor has at least one glass surface exposed to the external environment. Thanks to its glass surface, the detection device captures data from the external environment of the motor vehicle. The cleaning device allows the cleaning of the glass surface of the detection device such that said glass surface is freed from external pollutants and thus these optical performances are not degraded.

The cleaning device according to the invention cleans the glass surface with a straight jet. This means that the jet that impacts a surface forms a point on the surface. This point has a very small section, unlike flat and conical jets which have very large sections.

The idea behind the invention is to use this form of straight jet, also called "straight point", to have a stronger point of impact on the glass surface, so as to be able to better remove stubborn dirt. , and this for a constant flow through the nozzle. In fact, the fluid speed is higher than that of the prior art, because the passage section of the hole is smaller, for the same flow rate. Cleaning efficiency is thus improved.

The number of holes must be defined according to the surface to be cleaned.

Each hole forms a straight jet at the exit. All of these straight jets generally cover the glass surface to be cleaned.

By thus using one or more holes with a straight jet profile, the quantity of liquid cleaning product to be used is drastically reduced, while retaining a conventional cleaning device, in particular with a pump, a valve, a fluid circulation channel inside the nozzle, etc. Only the sprinkler head differs. It is more compact because the holes are very small compared to the prior art. The part protruding from the vehicle body is thus minimal.

le trou présente un diamètre compris entre 50 et 250µm. Pour comparaison, un trou d’un jet conique présente un diamètre compris entre 0,3 et 1mm.
la paroi d’aspersion présente une pluralité de trous répartis spatialement de façon à ce que leurs jets recouvrent la majeure partie de la surface vitrée à nettoyer située en vis-à-vis.
la paroi d’aspersion présente une pluralité de trous répartis uniformément.
tous les trous présentent une même section.
la paroi d’aspersion est orientée perpendiculairement ou obliquement à l’extrémité fermée.
l’extrémité fermée consiste en une paroi d’aspersion.
le trou est cylindrique.
la paroi d’aspersion est plane.
la paroi d’aspersion est incurvée.
tous les trous sont orientés perpendiculairement à la paroi d’aspersion, les jets droits en découlant étant perpendiculaires à la paroi d’aspersion.
tous les trous sont orientés obliquement à la paroi d’aspersion, les jets droits en découlant étant obliques à la paroi d’aspersion.
une partie des trous est orientée perpendiculairement à la paroi d’aspersion, et l’autre partie des trous est orientée obliquement à la paroi d’aspersion.

According to the different embodiments of the invention, which can be taken together or separately:

the hole has a diameter of between 50 and 250µm. For comparison, a hole in a conical jet has a diameter of between 0.3 and 1mm.
the spray wall has a plurality of holes distributed spatially so that their jets cover most of the glazed surface to be cleaned located opposite.
the spray wall has a plurality of uniformly distributed holes.
all holes have the same section.
the spray wall is oriented perpendicularly or obliquely to the closed end.
the closed end consists of a spray wall.
the hole is cylindrical.
the spray wall is flat.
the spray wall is curved.
all the holes are oriented perpendicular to the spray wall, the straight jets arising therefrom being perpendicular to the spray wall.
all the holes are oriented obliquely to the spray wall, the straight jets arising therefrom being oblique to the spray wall.
a part of the holes is oriented perpendicular to the spray wall, and the other part of the holes is oriented obliquely to the spray wall.

ladite tête d’aspersion comporte au moins une paroi d’aspersion dotée d’au moins un premier type de trou par lequel sort un jet d’impact, et au moins un second type de trou par lequel sort un jet rinçant, la section du trou de premier type étant inférieure à la section du trou de second type, le diamètre maximal des trous de second type étant inférieur à 250µm.
le dispositif de nettoyage nettoie la surface vitrée grâce à deux types de trous, formant deux types de jet en sortie.
Le premier type de trou, dont la section est très petite, et qui permet en sortie d’avoir un jet plus ciblé à forte impact, c’est-à-dire avec une forte pression sur la surface vitrée. Ce type de jet est utilisé pour décoller les salissures tenaces sur la surface vitrée.
Le second type de trou, dont la section reste petite, mais en étant légèrement plus grande que celle du premier type de trou, et qui permet en sortie d’avoir un jet moins ciblé, plus large, avec moins d’impact mais un plus fort pouvoir rinçant de surface. Ce jet est utilisé pour rincer la surface vitrée, par exemple pour enlever la poussière.
Le cumul de ces deux types de trou permet d’avoir un nettoyage performant de la surface vitrée. L’efficacité de nettoyage est ainsi améliorée.
Le débit de liquide passant par un trou de premier type est inférieur au débit de liquide passant par un trou de second type, car la section de passage du fluide d’un trou de premier type est inférieure à la section de passage d’un trou de second type, pour une même vitesse de fluide.

According to a variant embodiment,

said spray head comprises at least one spray wall provided with at least a first type of hole through which an impact jet emerges, and at least a second type of hole through which a rinsing jet emerges, the section of the hole of the first type being less than the section of the hole of the second type, the maximum diameter of the holes of the second type being less than 250µm.
the cleaning device cleans the glass surface using two types of holes, forming two types of jet at the outlet.
The first type of hole, whose section is very small, and which allows at the outlet to have a more targeted jet with high impact, that is to say with strong pressure on the glass surface. This type of jet is used to remove stubborn dirt from the glass surface.
The second type of hole, whose section remains small, but is slightly larger than that of the first type of hole, and which allows at the output to have a less targeted, wider jet, with less impact but more strong surface rinsing power. This jet is used to rinse the glass surface, for example to remove dust.
The combination of these two types of holes allows for efficient cleaning of the glass surface. Cleaning efficiency is thus improved.
The flow rate of liquid passing through a hole of the first type is less than the flow rate of liquid passing through a hole of the second type, because the fluid passage section of a hole of the first type is less than the passage section of a hole of second type, for the same fluid speed.

Le nombre de trous est à définir en fonction de la surface à nettoyer. L’ensemble des jets en sortie du gicleur doivent recouvrir globalement la surface vitrée à nettoyer.
Ces trous de premier type et de second type ont un diamètre inférieur à 250µm, alors que dans l’art antérieur un orifice de distribution a un diamètre de l’ordre de 0,3 mm à 1mm.
En utilisant ainsi ces petits trous de premier type et de second type, on diminue drastiquement la quantité de produit liquide de nettoyage à utiliser, tout en conservant un dispositif de nettoyage classique, notamment avec une pompe, une vanne, un canal de circulation de fluide à l’intérieur du gicleur, etc. Seule la tête d’aspersion diffère. Elle est plus compacte car les trous sont très petits par rapport à l’art antérieur. La partie dépassant de la carrosserie du véhicule est ainsi minime.
chaque jet est droit : cela signifie que le jet qui impacte une surface forme un point sur la surface. Ce point présente une section très petite, contrairement aux jets plats et coniques qui présentent des sections très larges. L’idée est d’utiliser cette forme de jet droit, encore appelée « straight point », pour avoir un point d’impact plus fort sur la surface vitrée, de façon à pouvoir encore mieux décoller les salissures tenaces, autant pour les trous de premier type que les trous de second type.
la paroi d’aspersion comporte une pluralité de trous de premier type répartis spatialement sur la paroi d’aspersion de façon à ce que leurs jets impactent différentes zones de la surface vitrée située en vis-à-vis.
la paroi d’aspersion comporte un seul trou de second type disposé sur la paroi d’aspersion de façon à rincer la surface vitrée située en vis-à-vis.
le trou de premier type est cylindrique et présente un diamètre égal ou inférieur à 150µm.
le trou de second type est cylindrique et présente un diamètre supérieur à 150µm et inférieur ou égal à 250µm.
le débit de liquide passant par un trou de premier type est inférieur au débit de liquide passant par un trou de second type.
le gicleur présente un unique canal de circulation de liquide, le liquide sortant simultanément par les premiers et seconds types de trous.
le gicleur présente un premier canal de circulation de liquide débouchant dans le(s) trou(s) de premier type, et un second canal de circulation de liquide débouchant dans le(s) trou(s) de second type, lesdits premier et second canaux étant raccordés à une vanne de façon à ce que le liquide sorte soit par le(s) trou(s) de premier type, soit par le(s) trou(s) de second type.
tous les trous sont orientés perpendiculairement à la paroi d’aspersion, les jets droits en découlant étant perpendiculaires à la paroi d’aspersion.
tous les trous sont orientés obliquement à la paroi d’aspersion, les jets droits en découlant étant obliques à la paroi d’aspersion.
une partie des trous est orientée perpendiculairement à la paroi d’aspersion, et l’autre partie des trous est orientée obliquement à la paroi d’aspersion.

Thus, we understand that the second type of hole ensures less impactful cleaning but with greater rinsing power thanks to its greater flow rate.

The number of holes must be defined according to the surface to be cleaned. All of the jets coming out of the nozzle must generally cover the glass surface to be cleaned.
These first type and second type holes have a diameter of less than 250 μm, whereas in the prior art a distribution orifice has a diameter of the order of 0.3 mm to 1 mm.
By thus using these small holes of the first type and the second type, the quantity of liquid cleaning product to be used is drastically reduced, while retaining a conventional cleaning device, in particular with a pump, a valve, a fluid circulation channel. inside the nozzle, etc. Only the sprinkler head differs. It is more compact because the holes are very small compared to the prior art. The part protruding from the vehicle body is thus minimal.
each jet is straight: this means that the jet which impacts a surface forms a point on the surface. This point has a very small section, unlike flat and conical jets which have very large sections. The idea is to use this form of straight jet, also called "straight point", to have a stronger point of impact on the glass surface, so as to be able to remove stubborn dirt even better, as well as for holes in the glass. first type than holes of the second type.
the spray wall comprises a plurality of holes of the first type distributed spatially on the spray wall so that their jets impact different zones of the glazed surface located opposite.
the spray wall comprises a single hole of the second type arranged on the spray wall so as to rinse the glazed surface located opposite.
the first type hole is cylindrical and has a diameter equal to or less than 150µm.
the second type hole is cylindrical and has a diameter greater than 150µm and less than or equal to 250µm.
the flow rate of liquid passing through a hole of the first type is less than the flow rate of liquid passing through a hole of the second type.
the nozzle has a single liquid circulation channel, the liquid exiting simultaneously through the first and second types of holes.
the nozzle has a first liquid circulation channel opening into the hole(s) of the first type, and a second liquid circulation channel opening into the hole(s) of the second type, said first and second channels being connected to a valve so that the liquid exits either through the first type hole(s) or through the second type hole(s).
all the holes are oriented perpendicular to the spray wall, the straight jets arising therefrom being perpendicular to the spray wall.
all the holes are oriented obliquely to the spray wall, the straight jets arising therefrom being oblique to the spray wall.
part of the holes is oriented perpendicular to the spray wall, and the other part of the holes is oriented obliquely to the spray wall.

ladite tête d’aspersion comporte au moins une paroi d’aspersion dotée de trous par lesquels sortent des jets, ces trous étant répartis dans des groupes, chaque groupe comprenant un ou plusieurs trous dont les jets atteignent une zone prédéfinie du véhicule, le gicleur présentant autant de canaux de circulation de liquide que de groupes, chaque canal débouchant dans un groupe de trou(s), lesdits canaux étant raccordés à des vannes autorisant le passage de liquide sélectivement dans un unique canal ou dans plusieurs canaux.
le dispositif de nettoyage, nettoie la surface vitrée grâce à plusieurs trous répartis dans plusieurs groupes.
Ainsi, il n’y a plus un unique orifice de distribution comme dans l’art antérieur, mais il y a une pluralités d’orifices de distribution, c’est-à-dire de trous, et ainsi une pluralité de jets.
Les trous sont répartis dans des groupes, afin de concentrer les jets d’un même groupe sur une zone prédéfinie du véhicule. Il y a donc plusieurs groupes qui nettoient plusieurs zones.
Ainsi, on peut nettoyer plusieurs zones du véhicule en même temps, avec une seule paroi d’aspersion.
Grâce aux vannes et aux différents canaux au sein du gicleur, il est possible de n’envoyer du liquide qu’à travers un seul groupe de trou(s) de façon à nettoyer une seule zone prédéfinie du véhicule, et ainsi éviter de gaspiller du liquide en envoyant des jets dans les autres groupes.

According to another alternative embodiment,

said spray head comprises at least one spray wall provided with holes through which jets emerge, these holes being distributed in groups, each group comprising one or more holes whose jets reach a predefined area of the vehicle, the nozzle having as many liquid circulation channels as there are groups, each channel opening into a group of hole(s), said channels being connected to valves allowing the passage of liquid selectively in a single channel or in several channels.
the cleaning device cleans the glass surface using several holes distributed in several groups.
Thus, there is no longer a single distribution orifice as in the prior art, but there are a plurality of distribution orifices, that is to say holes, and thus a plurality of jets.
The holes are distributed in groups, in order to concentrate the jets of the same group on a predefined area of the vehicle. So there are several groups cleaning several areas.
Thus, several areas of the vehicle can be cleaned at the same time, with a single spray wall.
Thanks to the valves and the different channels within the nozzle, it is possible to send liquid only through a single group of hole(s) in order to clean a single predefined area of the vehicle, and thus avoid wasting waste. liquid by sending jets into the other groups.

For example, if only one area of the glass surface of the detection device must be cleaned, the other areas being clean, liquid will only be sent into the channel associated with the group of hole(s) whose jet is directed towards this area precise to clean. Other areas will not be cleaned.

You can choose to send liquid into one or more channels, depending on the areas to be cleaned.

The use of several groups of hole(s) and several channels is also advantageous to adapt to the climatic conditions outside the vehicle. For example, a first group of hole(s) may have one or more jet(s) oriented towards the glass surface to be cleaned, and a second group of hole(s) may have one or more jet(s) oriented (s) towards an area of the vehicle located next to the glass surface to be cleaned. If the vehicle is not traveling quickly, then the first group can be activated via a first channel and its associated valve to send a jet towards the glass surface directly. If the vehicle is traveling fast or there is wind, then the second group can be activated via a second channel and its associated valve to send a jet towards the area located next to it, but which will be deflected by the wind or by the aerodynamic flow towards the glass surface to be cleaned.

les trous sont cylindriques.
les trous présentent un diamètre inférieur à 300µm.
les trous présentent un diamètre compris entre 50µm et 250µm.
les vannes sont raccordées à une pompe, le dispositif comportant une unité centrale commandant la pompe et/ou les vannes en fonction de données d’entrée, du type vitesse du véhicule ou température extérieure.
pour chaque groupe, chaque trou présente une orientation angulaire spécifique par rapport à la paroi d’aspersion, de sorte que le jet en sortant atteigne la zone prédéfinie sur le véhicule.
chaque groupe de trou(s) forme un ou plusieurs jet(s) apte(nt) à impacter une zone de la surface vitrée, la paroi d’aspersion comprenant autant de groupe de trou(s) que de zones à impacter sur la surface vitrée.
chaque jet est droit.

According to this other alternative embodiment,

the holes are cylindrical.
the holes have a diameter less than 300µm.
the holes have a diameter of between 50µm and 250µm.
the valves are connected to a pump, the device comprising a central unit controlling the pump and/or the valves according to input data, such as vehicle speed or exterior temperature.
for each group, each hole has a specific angular orientation relative to the spray wall, so that the jet leaving reaches the predefined area on the vehicle.
each group of hole(s) forms one or more jet(s) capable of impacting a zone of the glazed surface, the spray wall comprising as many groups of hole(s) as zones to impact on the surface glazed.
each jet is straight.

Brief description of the figures

Other characteristics and advantages of the invention will appear during reading of the detailed description which follows, for the understanding of which we will refer to the appended drawings in which:

There represents the projection of several different jet shapes;

There is a perspective view of a nozzle according to the prior art diffusing a flat jet;

There is a perspective view of a nozzle according to the invention with a first spray head configuration;

There is a perspective view of a nozzle according to a first variant of the invention with a first spray head configuration;

There is a perspective view of a nozzle according to the invention with a second spray head configuration;

There is a perspective view of a nozzle according to the first variant of the invention with a second spray head configuration;

There is a perspective view of a nozzle according to the invention with a 3rd spray head configuration;

There represents several possible arrangements of holes according to the first variant of the invention;

There represents the projection of a straight jet from a nozzle according to the invention;

There is a sectional view of an example of the spray head of a sprinkler according to one of Figures 3a to 5a;

There is a sectional view of an example of the spray head of a sprinkler according to one of Figures 3b to 5b;

There is a sectional view of another example of the spray head of a sprinkler according to one of Figures 3 to 5;

There is a detailed view of the holes present on a spray head of a sprinkler according to the invention;

There is a detailed view of the holes present on a spray head of a sprinkler according to the first variant of the invention;

There is a perspective view of a nozzle according to the invention with a fourth spray head configuration;

There is a perspective view of a nozzle according to the first variant of the invention with a fourth spray head configuration;

There is a sectional view of an example of the sprinkler head of a sprinkler according to the ;

There is a perspective view of a nozzle according to the invention with a fifth spray head configuration;

There is a perspective view of a nozzle according to the first variant of the invention with a fifth spray head configuration;

There is a perspective view of a nozzle according to the invention with a sixth spray head configuration;

There is a perspective view of a nozzle according to the first variant of the invention with a sixth spray head configuration;

There consists of a graph comparing the performances of a nozzle of the prior art compared to a nozzle according to the invention.

There is a perspective view of a nozzle according to a second variant of the invention;

There is a perspective and transparent view of the channels inside the nozzle of the ;

There is a schematic view of a hydraulic cleaning circuit according to a first configuration of the second variant of the invention;

There is a schematic view of a hydraulic cleaning circuit according to a second configuration of the second variant of the invention.

Detailed description of the invention

In the remainder of the description, elements having an identical structure or similar functions will be designated by the same references.

By convention, the “axial” direction corresponds to that of main extension of the nozzle, illustrated by the axis X in Figures 3a and 3b, and the “radial” direction is orthogonal to the axial direction. For example, the Y axis is orthogonal to the X axis and thus shows a radial direction.

In the detailed description of the figures which follows, the terms “upper” and “lower” or “top” and “bottom” will be used in a non-limiting manner with reference to the axial direction.

There represents the projection of several different jet shapes.

In this case,

representations

1a and 1b show the projection of a flat jet. In representation 1a, the flat jet has a convex distribution, while in representation 1b, the flat jet has a uniform distribution.

Representations

1c, 1d, 1e show the projection of a conical jet. This conical jet has a convex distribution on representation 1c, a uniform distribution on representation 1d, and a concave distribution on representation 1e.

These types of flat and conical jet are used in cleaning devices of the prior art, to clean the glass surface of different optical sensors belonging to detection systems installed on motor vehicles.

Such a cleaning device of the prior art is illustrated in . In this case, it is a nozzle 1 hydraulically connected to a cleaning product supply source.

The cleaning product is a fluid preferably in liquid form, of the windshield washer type. In general, a pump takes the liquid product from the supply source (in this case a tank) and returns it, via one or more valves, to the nozzle 1 which then diffuses the liquid product in the form of a jet towards the nearby optical sensor.

The nozzle 1 has a first end 6 corresponding to a hydraulic connection, and a second free end corresponding to a spray head 2 through which the liquid product is expelled. Here the liquid product is sprayed in the form of a flat jet with uniform distribution.

The nozzle 1 extends along a central axis at the sprinkler head 2.

The spray head 2 is closed and has an orifice for distributing the liquid product to diffuse it in the form of a jet, after it has been reflected on a deflection surface located inside the head 2, so as to obtain a flat spray.

For flat and conical jets, the single distribution orifice must be large enough to offer an extended projection at the outlet, of the order of 0.3mm to 1mm in diameter.

For conical jets, the distribution orifice must have a particular shape, for example with a first cylindrical section followed by a second conical section flared outwards. It is also possible to provide a swirl chamber inside the sprinkler head opening onto the distribution orifice. It is also possible to provide a nozzle in the spray head, with an anvil placed inside, so as to form a jet with a certain shape at the outlet. There are many technical solutions.

These flat and conical jets have the advantage of being able to diffuse the product with a relatively broad spectrum, and therefore to cover at least the entire width of the glass surfaces of the sensors.

However, the pressure of the liquid product on the glass surface at the time of impact is sometimes not sufficient to remove the most stubborn stains.

Hence the use of nozzles 1 according to the invention as illustrated in Figures 3 to 13. In these figures, the nozzle 1 used takes up all the technical characteristics of the nozzle 1 of the prior art, except the head of sprinkler 2.

The sprinkler head 2 is still closed thanks to a closed end 4, but it is simplified to the extreme. In particular, it does not have an internal deflection surface, nor a nozzle, nor an anvil, nor a distribution orifice with a complex shape or a large diameter.

The sprinkler head 2 according to the invention comprises at least one sprinkler wall 3 provided with at least one hole 5 through which a straight jet emerges.

It is a simple 5 hole, with a uniform section.

The jet is straight, which means that its projection corresponds only to a point, as shown in .

Such a straight jet cannot scan the entire width of a glass surface of a detection device, unless the glass surface is very small. However, with such a straight jet, the pressure is greater at the point of impact, compared to a conical or flat jet. Thus, this type of straight jet makes it possible to better clean dirty surfaces at the precise location where it impacts.

The spray wall 3 is oriented towards the detection device to be cleaned located near the nozzle 1.

According to the invention, each hole 5 has a diameter of between 50 and 250µm, which is very small compared to the diameter of the distribution orifices of the prior art. This also allows you to be precise at the point of impact on the surface to be cleaned.

To cover a larger surface area, several holes 5 can be provided in the spray wall 3, in order to distribute the jets over the surface to be cleaned. Preferably, the holes 5 are distributed spatially on the spray wall 3 so that their jets cover most of the glazed surface to be cleaned located opposite.

The quantity of holes 5 to be provided is calculated according to the extent of the surface to be cleaned nearby.

Preferably, the holes 5 are so small that the accumulation of their sections remains less than the section of a distribution orifice according to the prior art.

Thus, for the same flow rate passing through the nozzle 1, the pressure of the jet on the glass surface will be significantly greater with a spray head 2 according to the invention, than with a spray head 2 according to the prior art.

This is illustrated in particular in , where the curve with the small circles corresponds to the use of a nozzle 1 according to the prior art, and the curve with the small diamonds corresponds to the use of a nozzle 1 according to the invention. For the same flow rate (in ml/s), the pressure exerted on the surface to be cleaned by the jet emerging from a nozzle 1 according to the prior art and much lower than the pressure exerted on the same surface to be cleaned by the exiting jet of a nozzle 1 according to the invention.

Indeed, the smaller the passage section of the hole, the more the fluid speed increases for the same volume flow. Thanks to this greater fluid speed (i.e. the speed of interaction with the surface), cleaning efficiency is improved.

With these small holes, it follows that the consumption of liquid product necessary for cleaning is less compared to the prior art. In fact, consumption drops by at least 40%, and up to 60% with a nozzle according to the invention compared to a nozzle according to the prior art, and this while maintaining the same percentage of surface coverage. cleaned, as shown in the table below.

Std nozzle corresponds to a nozzle according to the prior art.

New nozzle corresponds to a nozzle according to the invention.

The first column specifies the percentage of surface covered by the jets.

The second column specifies the consumption of window washer fluid in ml/s.

The third column compares the liquid consumption between the two types of nozzle, and gives the percentage of liquid used with the nozzle according to the invention. The drop is around 60%.

The fourth column specifies the speed of the fluid leaving the orifice/hole.

The fifth column compares the speed of the fluid between the two types of nozzle, and gives the percentage of additional speed with the nozzle according to the invention. There is a speed increase of around 17% to 20%.

According to a first configuration of the sprinkler head 2 shown in , the spray wall 3 has a plurality of holes 5 distributed uniformly. In this case, there are 36 holes 5 distributed over six columns oriented perpendicular to the axis X, each column comprising six holes 5. Each hole 5 has a diameter of 100 µm.

According to a second configuration of the sprinkler head 2 shown in , the spray wall 3 has four holes 5 aligned on a single column oriented perpendicular to the axis X. Each hole 5 has a diameter of 200 µm.

According to a third configuration of the sprinkler head 2 shown in , the spray wall 3 has seven holes 5 aligned on two columns oriented perpendicular to the axis X. The holes 5 are staggered from one column to the other.

Preferably, whatever the configuration, the holes 5 have the same section.

However, in the context of the present invention, it would be possible to envisage that the holes 5 do not have the same section depending on their location on the spray wall 3.

We understand that there can be a multitude of possible configurations, depending on the number of holes 5, their section, and their positioning on the spray wall 3.

It will be noted that the holes 5 are preferably arranged in the vicinity of the closed end 4 of the spray head 2. In fact, only the spray head 2 protrudes from the body of the vehicle. The closer the holes 5 are to the closed end 4, the more it will be possible to hide part of the sprinkler head 2 in the bodywork. This is valid for fixed nozzles in the bodywork. The nozzles of the present invention can also be removable, in particular movable by translation, or even telescopic in order to disappear under the hood.

In Figures 3 to 5, the spray walls are oriented perpendicular to the closed end 4. However, in the context of the present invention, it would be possible to provide spray walls oriented obliquely to the closed end 4 , that is to say inclined relative to the axis X. The orientation of the spray wall 3 depends in particular on its position relative to the surface to be cleaned.

In the 3 examples shown in Figures 3 to 5, the sprinkler head 2 has a rectangular section. It is therefore made up of four side walls, and an end wall.

Depending on the relative positioning between the nozzle 1 and the glass surface to be cleaned of the detection device, the holes 5 will be made on one of these five walls. Indeed, it is possible to consider making holes 5 on the end wall if this is more practical for the integration of the nozzle 1 in relation to the detection device within the bodywork. Thus the end wall can also correspond to a spray wall 3.

It is also possible to consider making holes 5 on several walls of the same nozzle 1, in order to be able to simultaneously or alternately clean several glass surfaces belonging to several detection devices which are located near this nozzle 1. In this case, the spray head 2 has several spray walls 3.

It is possible to consider having several channels inside the nozzle 1 in order to be able to send liquid selectively towards one or the other spray wall 3 depending on the sensor to be cleaned nearby.

According to an alternative embodiment shown in , the spray head 2 no longer has a single outlet orifice, but at least two outlet orifices or holes 5 of different types, called first type of hole 5a, and second type of hole 5b.

These two types of

hole

5a, 5b are located on the same spray wall 3.

The spray head 2 comprises at least one spray wall 3. The spray wall 3 is oriented towards the detection device to be cleaned located near the nozzle 1.

The spray head 2 could include several spray walls 3 if there are several glass surfaces to clean.

The first type of hole 5a allows an impact jet to be released.

The second type of hole 5b allows a rinsing jet to exit.

The section of the first type 5a and second type 5b holes is less than 0.15mm2, which is very small compared to the prior art.

Thus, instead of having a single jet which must cover the entire glass surface, there are a plurality of jets which arrive at several areas of the glass surface, so that in the end the cleaning fluid is spread over the entire surface.

The section of the first type hole 5a is less than the section of the second type hole 5b.

The smaller the passage section of hole 5, the more the fluid speed increases for the same volume flow. Thanks to this greater fluid speed (i.e. the speed of interaction with the surface), the point of impact on the glass surface will be greater in terms of impact pressure, compared to the prior art. Thus, the first type 5a holes are mainly used to strongly impact the glass surface on several points, in order to remove stubborn stains.

The second type 5b holes ensure surface rinsing, with less impact.

The combination of the two types of

hole

5a, 5b makes it possible to improve cleaning efficiency.

Holes 5 (first type and second type) are simple, with a uniform section.

Preferably, the holes 5 are cylindrical. But they could have a square or rectangular section.

These simple holes 5 make it possible to obtain a straight jet at the outlet, which means that its projection corresponds only to a point, as is illustrated in .

According to this alternative embodiment, the holes of first type 5a have a diameter equal to or less than 150 μm. This also allows you to be precise at the point of impact on the surface to be cleaned.

For example, the first type 5a holes have a diameter of 50µm.

The second type 5b holes have a diameter greater than 150 µm and less than 250 µm.

The quantity of first type 5a holes to be provided is calculated based on the extent of the nearby surface to be cleaned.

To this is added at least one second type hole 5b in the spray wall 3. This second type hole 5b is arranged on the spray wall 3 so that its jet reaches the glass surface, rinsing it thanks to to the spreading of the fluid on the surface. The orientation of the jet is therefore important to ensure spreading over the entire surface after impact.

The holes of first type 5a and second type 5b are so small that the accumulation of their sections remains less than the section of a distribution orifice according to the prior art.

However, the smaller the passage section of the hole, the more the fluid speed increases for the same volume flow. Thanks to this greater fluid speed (i.e. the speed of interaction with the surface), cleaning efficiency is improved.

According to a first configuration of the sprinkler head 2 shown in , the spray wall 3 has a plurality of holes of the first type 5a distributed uniformly. In this case, there are 32 holes 5a distributed over six columns and 6 rows. The spray wall 3 also has a second type hole 5b positioned in the center. All holes are cylindrical.

According to a second configuration of the sprinkler head 2 shown in , the spray wall 3 has four first type holes 5a aligned on a single column oriented perpendicular to the axis X, and a second type hole 5b positioned under the first type holes 5a. All holes are cylindrical.

There (left) shows more precisely this distribution of holes 5 of the .

There (right) shows another possible spatial representation of the holes, with a single hole of second type 5b planetary (in the center), and 6 holes of first type 5a satellites (on the periphery). In this example, the holes of the first type 5a have a diameter of 100 μm, and the hole of the second type 5b has a diameter of 250 μm. All holes are cylindrical.

In the spray wall 3, the flow rate passing through a hole of the first type 5a is logically reduced compared to the flow rate passing through a hole of the second type 5b, but the jet leaving a hole of the first type 5a has a point d greater impact. The second type hole therefore has a greater flow rate, but with less impact, and instead ensures general rinsing of the glass surface.

We understand that there can be a multitude of possible configurations, depending on the number of

holes

5a and 5b, their section, and their positioning on the spray wall 3.

Preferably, the holes 5 are arranged in the vicinity of the closed end 4 of the spray head 2. In fact, only the spray head 2 protrudes from the body of the vehicle. The closer the holes 5 are to the closed end 4, the more it will be possible to hide part of the sprinkler head 2 in the bodywork. This is valid for fixed nozzles in the bodywork. The nozzles of the present invention can also be removable, in particular movable by translation, or even telescopic in order to disappear under the hood.

In Figures 3b and 4b, the spray walls are oriented perpendicular to the closed end 4. However, in the context of the present invention, it would be possible to provide spray walls oriented obliquely to the closed end 4 , that is to say inclined relative to the axis X. The orientation of the spray wall 3 depends in particular on its position relative to the surface to be cleaned.

In the two examples shown in Figures 3b and 4b, the sprinkler head 2 has a rectangular section. It is therefore made up of four side walls, and an end wall.

de pouvoir envoyer du liquide sélectivement vers l’une ou l’autre paroi d’aspersion 3 en fonction du capteur à nettoyer à proximité ;
de pouvoir envoyer du liquide sélectivement vers les trous de premier type 5a d’une paroi d’aspersion 3, ou vers les trous de second type 5b de cette même paroi d’aspersion 3.

It is possible to consider having several channels inside nozzle 1 in order to:

to be able to send liquid selectively towards one or the other spray wall 3 depending on the sensor to be cleaned nearby;
to be able to send liquid selectively towards the first type holes 5a of a spray wall 3, or towards the second type holes 5b of this same spray wall 3.

A valve upstream of the nozzle manages the sending of liquid to the different channels.

Figures 7 and 8 show a sectional view of these spray heads 2 with a rectangular section. In these sectional views, some holes 5 are shown through which liquid product escapes in the form of a straight jet.

Generally speaking, in all the configurations shown in Figures 3 to 13, the holes 5 are cylindrical, or almost cylindrical. In most manufacturing processes, the holes are almost cylindrical, but are slightly flared into a cone shape.

In the figures presented, the cylindrical holes have a circular section at the outlet.

However, in the context of the present invention, the cylindrical holes could have a square, or rectangular, or other section.

It will be noted that in Figures 7a and 7b the holes 5 are oriented perpendicular to the spray wall 3.

On the , the two central holes 5 are oriented perpendicular to the spray wall 3, while the two lateral holes 5 are oriented obliquely to the spray wall 3.

When the holes 5 are oriented perpendicular to the spray wall 3, the straight jets resulting from them are perpendicular to the spray wall 3.

When the holes 5 are oriented obliquely to the spray wall 3, the straight jets resulting therefrom are oblique to the spray wall 3.

This is valid for both first type 5a holes and second type 5b holes.

Depending on the case, all the holes 5 can be oriented perpendicular to the spray wall 3, or only some, where all the holes 5 can be oriented obliquely to the spray wall 3, or only some.

The obliquely oriented holes 5 can be oriented inwards as on the (i.e. towards the Y axis), or outwards as in Figures 12a and 12b (i.e. moving away from the Y axis), or again towards the rear illustrated in Figures 13a and 13b (that is to say towards the first end 6 of the nozzle 1), or even towards the front (that is to say towards the second end 4 of nozzle 1), and this in combination.

The angles are chosen according to the area to touch with the jet on the surface to be cleaned.

Figures 9a and 9b show an enlarged view of a spray wall 3 with a plurality of holes 5 of cylindrical section, each hole 5 having a specific orientation, defined according to the surface to be cleaned located nearby, so as to direct the jets to specific locations on the surface.

In Figures 3 to 5, and 7 to 8, the spray wall 3 is flat.

However, the spray wall 3 could be curved, as illustrated in Figures 10 to 13.

In particular in Figures 11a and 11b, showing a sectional view of part of the section of the sprinkler head 2 of Figures 10a and 10b, we can clearly see the curved shape of the sprinkler wall 3 in which the 5 holes are made.

The use of a nozzle 1 according to a second alternative embodiment of the invention as illustrated in Figures 15 and 16, no longer requires the use of a large quantity of cleaning liquid. In fact, the entire glass surface is cleaned each time the sprinkler is activated, even though there is only a small dirty area to clean on the glass surface.

The use of a nozzle 1 according to the second alternative embodiment of the invention as illustrated in Figures 15 and 16, also makes it possible to no longer waste the cleaning liquid. Indeed, when the outside temperature drops, or there is a lot of wind, or the vehicle is traveling at high speed, the jet tends to be deflected and water an area located next to the glass surface.

In these figures, the nozzle 1 used has several cleaning liquid inlets E1, E2, each inlet E1, E2 being connected to a circulation channel for the cleaning liquid which travels through the spray head 2 of the nozzle 1.

In the example shown, there are two channels C1 and C2. There could be more within the scope of the present invention.

Thus the first channel C1 starts at the first input E1, and the channel C2 starts at the second input E2.

These liquid inlets E1, E2 correspond to hydraulic connections, suitable for being connected to valves.

The channels C1, C2 have a first section extending in a first direction X1, X2, then a second section extending in a second direction Y1, Y2 perpendicular to the first direction X1, X2.

Other channel paths and orientations are within the scope of the present invention.

Holes 5 are made in the spray head 2, more precisely at the level of a spray wall 3, and open into the channels C1, C2, at the level of the end of the channels, in their second sections.

In the example presented, four holes 5 open into the first channel C1, and four holes 5 open into the second channel C2.

These holes are aligned along axes Y1 and Y2, but they could have another spatial distribution, as long as they open into the corresponding channel.

The nozzle 1 presented thus comprises a first group G1 of four holes 5 exiting from the first channel C1, and a second group G2 of four holes 5 exiting from the second channel C2.

There are as many groups of holes as there are channels.

When cleaning liquid is injected into the E1 inlet of nozzle 1, four jets will exit through the four holes 5 of group G1.

When cleaning liquid is injected into inlet E2 of nozzle 1, four jets will exit through the four holes 5 of group G2.

Holes 5 have a uniform section.

Preferably, the holes 5 are cylindrical, therefore with a circular section.

But they could have a square or rectangular section.

There is no deflection surface in the sprinkler head, no nozzle, no anvil, as in the prior art. Holes 5 are simple.

Such a straight jet cannot scan the entire width of a glass surface of a detection device, unless the glass surface is very small. However, with such a straight jet, the pressure is greater at the point of impact, compared to a conical or flat jet. Thus, this type of straight jet makes it possible to better clean dirty surfaces at the precise location where it impacts them.

According to this alternative embodiment of the invention, the holes 5 have a diameter of less than 300µm. These are therefore small holes compared to the prior art.

Preferably, the holes have a diameter of between 50µm and 250µm.

The smaller the passage section of hole 5, the more the fluid speed increases for the same volume flow. Thanks to this greater fluid speed (i.e. the speed of interaction with the surface), the point of impact on the glass surface will be greater in terms of impact pressure, compared to the prior art.

This also allows you to be precise at the point of impact on the surface to be cleaned.

The holes 5 are so small that the accumulation of their sections remains less than the section of a distribution orifice according to the prior art.

With these small holes, it follows that the consumption of liquid product necessary for cleaning is less compared to the prior art. In fact, consumption drops by at least 40%, and up to 60% with a nozzle according to this variant of the invention compared to a nozzle according to the prior art, and this while maintaining the same percentage of coverage. of the cleaned surface.

Each hole 5 has a specific angular orientation relative to the spray wall 3, so that the emerging jet points towards a specific area of the vehicle.

For example, a hole can be perpendicular to the spray wall 3 and thus send a jet perpendicular to the spray wall 3, or it can be oblique with respect to the spray wall 3 and thus send a jet oriented towards to the right, or to the left, and/or towards the front or towards the rear of the sprinkler head 2.

The angles are chosen based on the area to hit with the jet on the vehicle.

The vehicle includes a hydraulic circuit for cleaning the glass surface of a detection device fitted to the vehicle.

The cleaning liquid is stored in a tank 7. A pump 8 sucks this liquid and injects it into a network of valves V arranged upstream of the nozzle 1 and connected to the inlets E of the nozzle 1.

In the first configuration shown on the , nozzle 1 has four inlets E1, E2, E3, E4 connected to four valves V1, V2, V3, V4.

These inputs E1, E2, E3, E4 open onto four internal channels C1, C2, C3, C4 running inside the nozzle 1 and opening onto groups G1, G2, G3, G4 of holes 5 through which exit jets when liquid is sent into it. In other words, there are four paths.

The holes 5 are made in the spray wall 3 which is arranged opposite a glazed surface of a detection device.

This glass surface is divided into several zones Z1, Z2, Z3, Z4 to be cleaned.

There are as many channels as areas to clean, and vice versa.

The zones are thus separated hydraulically thanks to the plurality of paths.

Thus, the holes 5 of group G1 are oriented so that their jets reach zone Z1, and are distributed over this zone Z1.

Likewise for holes 5 of groups G2, G3, G4 opposite zone Z2, Z3, Z4.

If the entire glass surface is dirty, then all areas must be cleaned, and all valves will be opened to allow the cleaning fluid to pass through all channels to spray the entire glass surface.

If only one area is dirty, then only the valve corresponding to the group of holes facing the area in question will be open, the other valves will be closed. This helps avoid wasting liquid unnecessarily on areas that do not need to be cleaned.

If several zones are dirty, then the corresponding valves are opened, the other valves are closed.

In addition to cleaning only dirty areas, these are cleaned with several small high-impact jets, therefore with high cleaning performance.

In the second configuration shown in , nozzle 1 has two inlets E1, E2 connected to two valves V1, V2.

These inlets E1, E2 open onto two internal channels C1, C2 running inside the nozzle 1 and opening onto groups G1, G2 of holes 5 through which jets emerge when liquid is sent there.

In this example, this glazed surface is not divided, it corresponds to a zone Z1 of the vehicle. It would be entirely possible to divide it as in the previous example.

A second zone Z2 of the vehicle is located next to zone Z1. This could be a bodywork area for example, or any other part of the vehicle.

The holes 5 of group G1 are oriented so that their jets reach zone Z1, and are distributed over this zone Z1.

The holes 5 of group G2 are oriented so that their jets reach zone Z2, and are distributed over this zone Z2 (as illustrated by the dotted lines).

When the vehicle is stationary or traveling below a threshold speed, of the order of 70 km/h for example, and in the absence of wind, then only valve V1 will be open and liquid cleaning will impact zone Z1 of the glass surface to clean it if necessary.

When the vehicle is traveling above the threshold speed, or when there is a lot of wind, then the jets leaving the group of holes G1 are deflected by the aerodynamic flow or by the wind (illustrated by the arrow) and spray a area next to the glass surface. Thus, the cleaning function is inoperative under these conditions, and the cleaning liquid is wasted if valve V1 is open.

To remedy this problem, the holes 5 of group G2 are oriented relative to the spray wall 3 so that their jets, which normally reach the zone Z2 in the absence of wind or when the vehicle is traveling at a speed speed below the threshold value, reach zone Z1 by being deflected by the aerodynamic flow or by the wind (as illustrated by the solid lines).

Thus, when the vehicle is traveling above the threshold speed, or when there is a lot of wind, valve V1 is closed while valve V2 is open and cleaning liquid will impact zone Z1 of the glass surface to clean it if necessary.

We understand that depending on the position of the detection device on the vehicle, the aerodynamic impact will be different, and the orientation of the holes 5 will be adjusted accordingly beforehand.

The cleaning device comprises a central unit which receives input data from sensors, in particular a vehicle speed sensor, or an anemometer, or a temperature sensor, which makes it possible to know the weather conditions or the driving speed of the vehicle. Depending on these external parameters, and whether or not it is necessary to clean the glass surface of the detection device, the central unit controls the pump and/or the valves, in order to activate the correct jets on the correct area to be cleaned.

The valves can correspond to solenoid valves controlled by the central unit. These are active valves, controlled via an electrical system.

The valves can also correspond to passive valves, which open or close depending on the pressure of the cleaning liquid sent by the pump. For example, if the central unit commands the pump to send liquid to the valves at a pressure between 2 and 3 bars, then only valve V1 opens, while if the pressure is between 3 and 4 bars, then only valve V2 opens.

Such a choice of valve, active or passive, is also valid for the first configuration explained previously.

Whatever the configuration, the holes 5 are preferably arranged in the vicinity of the closed end 4 of the spray head 2. In fact, only the spray head 2 protrudes from the body of the vehicle. The closer the holes 5 are to the closed end 4, the more it will be possible to hide part of the sprinkler head 2 in the bodywork. This is valid for fixed nozzles in the bodywork. The nozzles of the present invention can also be removable, in particular movable by translation, or even telescopic in order to disappear under the hood.

The spray head 2 could include several spray walls 3 if there are several glass surfaces to clean. It is possible to multiply the channels accordingly.

According to the present invention, whether the spray wall 3 is flat or curved, the angular orientation of the holes is chosen as explained previously, obliquely or perpendicularly, depending on the position and extent of the target surface to be cleaned, the objective being to have a significant coverage rate of the surface to be cleaned.

Other shapes and other sections of sprinkler heads may fall within the scope of the present invention, as long as the holes 5 make it possible to project straight jets which reach the surface to be cleaned of the detection device.

The sprinkler heads can advantageously be obtained by additive manufacturing in order to obtain very small section holes, rather than by drilling them.

That said, any other manufacturing technique can be considered in the context of the present invention.

The configurations shown in the figures cited are only possible examples, in no way limiting, of the invention which on the contrary encompasses variants of shapes and designs within the reach of those skilled in the art.

Claims

Cleaning device for a glazed surface of a detection device fitted to a vehicle, comprising a nozzle (1) supplied with liquid cleaning product, and having a spray head (2) diffusing the liquid in the form of a jet, said head sprinkler (2) having a closed end (4),
in which said sprinkler head (2) comprises at least one sprinkler wall (3) provided with at least one hole (5) through which a straight jet emerges.
Device according to the preceding claim, in which the hole (5) has a diameter of between 50 and 250µm.
Device according to one of the preceding claims, in which the spray wall (3) has a plurality of holes (5) distributed spatially so that their jets cover the majority of the glazed surface to be cleaned located opposite it. notice.
Device according to one of the preceding claims, in which the spray wall (3) has a plurality of holes (5) distributed uniformly.
Device according to one of the preceding claims, in which the spray wall (3) is oriented perpendicularly or obliquely to the closed end (4).
Device according to one of Claims 1 to 4, in which the closed end (4) consists of a spray wall (3).
Device according to one of the preceding claims, in which the spray wall (3) is flat or curved.
Device according to claim 1, in which said spray head (2) comprises at least one spray wall (3) provided with at least a first type of hole (5a) through which an impact jet emerges, and at least a second type of hole (5b) through which a rinsing jet emerges, the section of the first type hole (5a) being less than the section of the second type hole (5b), the maximum diameter of the second type holes ( 5b) being less than 250µm.
Device according to claim 1 or 8, in which the spray wall (3) comprises a plurality of holes of the first type (5a) distributed spatially on the spray wall (3) so that their jets impact different zones of the glazed surface located opposite
Device according to one of claims 1, 8 and 9, in which the flow rate of liquid passing through a hole of the first type (5a) is less than the flow rate of liquid passing through a hole of the second type (5b).
Device according to one of the preceding claims, in which all the holes (5, 5a, 5b) are oriented perpendicular to the spray wall (3), the straight jets resulting therefrom being perpendicular to the spray wall (3) .
Device according to one of claims 1 to 10, in which all the holes (5, 5a, 5b) are oriented obliquely to the spray wall (3), the straight jets resulting therefrom being oblique to the spray wall ( 3).
Device according to one of claims 1 to 10, in which a part of the holes (5, 5a, 5b) is oriented perpendicular to the spray wall (3), and the other part of the holes (5, 5a, 5b ) is oriented obliquely to the spray wall (3).
Device according to claim 1, in which said spray head (2) comprises at least one spray wall (3) provided with holes (5) through which jets emerge, these holes (5) being distributed in groups ( G1, G2, G3, G4), each group (G1, G2, G3, G4) comprising one or more holes (5) whose jets reach a predefined zone (Z1, Z2, Z3, Z4) of the vehicle, the nozzle ( 1) presenting as many liquid circulation channels (C1, C2, C3, C4) as groups (G1, G2, G3, G4), each channel (C1, C2, C3, C4) opening into a group (G1, G2, G3, G4) of hole(s) (5), said channels (C1, C2, C3, C4) being connected to valves (V1, V2, V3, V4) allowing the passage of liquid selectively in a single channel or in several
Device according to the preceding claim 1 or 11, in which the valves (V1, V2, V3, V4) are connected to a pump (7), the device comprising a central unit controlling the pump (7) and/or the valves (V1 , V2, V3, V4) depending on input data, vehicle speed or outside temperature.