FR2813259A1 - Machine for cleaning vehicle windows has two separate cleaning liquid supply circuits to spay nozzles - Google Patents

Abstract

The machine for cleaning motor vehicle windows has a windscreen wiper with a first cleaning circuit (20) to spray a first liquid onto the screen (15), with a reservoir (22) for the first liquid. The circuit has a pump (36) to pressurize the liquid and a nozzle (34) to project the liquid onto the windscreen. A second cleaning circuit (50) sprays a second liquid onto the screen, having a different composition.

Description

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"Device for cleaning a window" The invention relates to a device for cleaning a window. The invention relates more particularly to a device for cleaning a window of a motor vehicle.

Driving in the best safety conditions requires the driver to have the best possible visibility and it is for this purpose necessary that the various windows or windows of the vehicle, and in particular the windshield and the rear window, are the most own possible.

In order to ensure the cleanliness of the panes, it is known to arrange one or more wiper mechanisms which each drive in alternating wiping a wiper blade made of flexible elastomer material having the essential function of removing the liquids present in the external surface of the window to be wiped, and in particular rain, to ensure good visibility in bad weather.

Such a flexible wiping blade also makes it possible to remove from the surface of the glass snowflakes or other elements, and in particular dirt, which are only deposited on the surface, that is to say which n do not adhere to it too strongly. When the external surface of a glass to be wiped is covered with deposits, of different natures, which are generally glued elements or which adhere to the surface of the glass, one or more flexible wiping blades are most often ineffective for cleaning the window, that is to say to "peel off" these elements from the surface of the window and evacuate them in an area which does not interfere with the driver.

In order to solve this problem, it has already been proposed to associate with the wiping blade at least one scraping blade in one or more sections, of the type in which at least the lower part of the blade is made of rigid or semi-material -rigid to remove from the surface solid bodies which adhere to it.

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 For example, the lower part of the scraping blade constitutes an active part of the blade, that is to say that it comprises a scraping part.

The scraping part of the underside comprises the scraping means of the external surface of the glass which may consist of scraping teeth. Each tooth can in particular have a different profile and the number and arrangement of the teeth can correspond to different combinations.

The scraping blade is mounted vertically movable, in both directions, between its high, retracted or retracted position, and an active low position in which the scraping blade cooperates with the face of the glass in order to scrape it.

The movement of the scraping blade is controlled by means such as hydraulic cylinders for controlling the movement of the blade.

To lower the scraping blade a pressurized fluid, which may be the liquid for washing the window to be wiped, is introduced into a control chamber for the jacks. The return of the scraping blade to the high position can be obtained by a return spring.

However, such a device does not always make it possible to clean the glass with which it is in contact, in particular when the solid bodies adhere strongly to it and for example frost or ice.

The invention aims to propose a new design of a device for cleaning a window in order to obtain a perfectly effective cleaning of the window.

To this end, the invention provides a device for cleaning a window, in particular a window of a motor vehicle covered at least partially with frost and / or dirt, of the type which comprises at least one wiping mechanism. -window, a first cleaning circuit for projecting a first liquid onto the glass, and which comprises a reservoir for the first liquid, a

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 first device for pressurizing the first liquid and at least one first device for projecting the first liquid onto the window, and of the type in which the first tanks, pressurizing device and spraying device are connected together, characterized in that that it comprises at least a second cleaning circuit for projecting onto the glass a second liquid of a nature and / or composition and / or physical characteristics different from those of the first liquid.

According to other characteristics of the invention - the device comprises means for heating the second liquid; the means for heating the second liquid comprise an electrical heating resistance; - The heating means consist of an exothermic reaction, by mixing the second liquid with at least one reactive product; - the reactive product is a fourth liquid; - The mixing of the second and fourth liquid is carried out on the window to be cleaned; - The reactive product is a first solid element such as a powder or crystals which dissolves on contact with the second liquid; - The mixing of the second liquid and the reactive product is carried out in the second cleaning circuit; - The fourth liquid consists of at least part of the liquid contained in the first tank; - The device comprises a second means for pressurizing the second liquid; - The first and second means of pressurizing are a single means of pressurizing; - the second pressurizing means raise the pressure of the second liquid to a second higher pressure

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 at a first pressure of the first liquid obtained by the first pressurizing means; - The second liquid is projected onto the window to be cleaned by a second projection device; - at least one of the projection devices comprises at least one projection nozzle; - at least one of the projection nozzles is carried by a mobile element, such as an arm or a blade of the wiper mechanism; - At least one of the projection nozzles is carried by a fixed element, such as a bodywork element of a vehicle; - at least one of the nozzles is located in a central position relative to the area of the window to be cleaned; - At least one of the projection nozzles is orientable relative to the window to be cleaned as a function of at least one parameter of the vehicle such as the aerodynamic flow or the speed of the vehicle; - the second liquid has detergent properties; - the second liquid consists of a detergent solution stored in a second tank; - The second liquid is obtained by mixing a detergent substance with a fifth liquid; - The fifth liquid consists at least in part of the liquid contained in the first tank; - The detergent substance is a solid element such as a tablet, which dissolves on contact with the fifth liquid; - the second liquid has de-icing properties; - the second liquid consists of a deicing solution stored in a second tank; - The device comprises a third cleaning circuit for projecting onto the glass a third liquid of a nature and / or composition and / or physical characteristics different from those of the first and second liquids;

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 - The first and the second circuit comprise at least a first and / or a second pipe respectively which connects together the different components of the circuit; - The third circuit includes a third pipe which connects them the constituent elements of this third circuit; - At least two of said first and / or second and / or third pipes are connected together by an additional conduit which extends from a point of derivation of one of the pipes to a connection point of the other pipe; - at least two of said circuits include common elements, such as a liquid reservoir, pressurizing means, a projection device, or a section of pipe; - The device comprises means for controlling the projection of at least one of the liquids; the liquid spraying control means make it possible to spray the first and the second and / or the third liquid concomitantly; the control means are actuated manually by the user of the vehicle; the control means are actuated as a function of the climatic conditions outside the vehicle, such as the temperature, the dew point and the presence or not of rain; - The control means are actuated according to the presence of frost and / or dirt on the outer surface of the window to be cleaned; the wiper mechanism comprises a wiper arm which is driven in alternating sweeping at least at a first speed which allows the cleaning of the window, and when at least one of the second and / or third liquids is projected onto the window, the wiper arm is driven at a second speed lower than the first to allow spreading of the second and / or third liquid.

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 Other characteristics and advantages of the invention will appear on reading the detailed description which follows, for the understanding of which reference will be made to the appended drawings in which - FIG. 1 schematically represents a first embodiment of 'A device for cleaning a window produced in accordance with the teachings of the invention; - Figures 2 to 5 show, schematically, other embodiments of the glass cleaning device which are produced in accordance with the teachings of the invention.

In the description which follows, identical, similar or analogous components will be designated by the same reference numbers.

FIG. 1 represents a cleaning device 10, which makes it possible, in particular by the alternating rotational movement of wipers 12, to clean areas 14 which are delimited by dashed lines 16, of a window to be wiped, here d 'a windshield 18 of a motor vehicle.

In known manner, the wipers can be driven according to several alternating rotation speeds.

In general, a small and a high wiping speed are used depending on the external conditions, in particular the intensity of precipitation such as rain or snow.

In known manner, the wipers 12 consist of an arm, one free end of which is driven in alternating rotation by a motor, not shown, and the other end of which carries a brush or a wiper blade of flexible material which allows to evacuate the water and / or the particles out of the zones 14 of the windshield 18. The arms can also be driven according to an alternating linear sweep.

To facilitate the cleaning of the zones 14, the cleaning device 10 comprises a first cleaning circuit 20 which makes it possible to spray a first liquid onto the windshield 18.

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 The first cleaning circuit 20 notably comprises a reservoir 22 which allows the storage of the first liquid. It comprises, in an upper wall 24, a filling orifice closed by a plug 26 which allows the user of the vehicle to fill it with the first liquid.

The first liquid generally consists of water to which a small amount of detergent liquid is added so as to facilitate cleaning of the windshield 18.

A drain orifice 28 is produced in a lower wall 30 of the reservoir 22, and it is in communication with a first pipe 32 which makes it possible to supply the first projection devices 34, here carried by the wipers 12.

To ensure the projection of the first liquid on the windshield 18 of a pressurizing device 36, such as a pump, is interposed in the pipe 32.

Thus, the first pressurized liquid is sprayed onto the windshield by the first projection devices 34.

The wipers 12 make it possible to wipe the windshield 18 when it is covered with liquids, such as rain water. When other elements such as deposits or dirt are deposited on its surface, the spraying of the first liquid on the windshield 18 makes it possible to suspend them then, similarly to the liquids, then the wiping blades of the windscreen wipers 12 evacuate them, out of the cleaning zone 14.

The wipers 12 also make it possible to remove snowflakes from the surface of the windshield 18.

However, when the dirt adheres to the outer surface of the windshield 18, the wipers 12 associated with the first liquid do not allow it to be cleaned. We then say that the dirt is stubborn.

When a layer of frost or ice is deposited on the windshield 18, the projection of the first liquid does not allow the wipers 12 to sweep it. Indeed, even specific devices, such as for example scraping devices, are

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 sometimes ineffective when the layer of frost or ice is too large.

Stubborn dirt, as well as frost or ice, which are deposited on the outer surface of the windshield 18, in particular on the zones 14, impede the visibility of the driver of the vehicle. The security conditions are therefore not optimal.

To solve this problem, the invention proposes to spray on the windshield 18 at least one second liquid of a nature and / or composition and / or physical characteristics different from those of the first liquid.

In accordance with FIG. 1, the cleaning device 10 comprises for this purpose a second 50 and a third 52 cleaning circuit which make it possible to spray a second and a third liquid respectively on the windshield 18. They have a nature and / or a composition and / or physical characteristics different from those of the first liquid, and also different from each other.

For example, the second liquid has strongly detergent properties which can also be degreasing and which make it possible to separate dirt, even stubborn, from the outer surface of the windshield 18.

The third liquid can then have de-icing properties, that is to say that it has a low melting point which makes it possible to melt the frost and / or the ice formed on the outer surface of the windshield. 18.

The second liquid consists of a detergent solution which is stored in a second tank 54. The third liquid is a deicing solution which is stored in a third tank 56.

In accordance with the first circuit 20, each of the second 50 and third 52 circuits comprise second and third pressurizing means 58 and 60, as well as a second and a third pipes 62 and 64.

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 Here, the three circuits 20, 50 and 52 are connected by a single pipe 66 to the projection devices 34.

The pressurizing means 36, 58 and 60 of the first, second and third liquids are activated by control means which can be manipulated by the user of the vehicle, or by processing information supplied by sensors such as sensors detecting the conditions of frost formation on the outer surface of the windshield 18, and / or detecting the presence of frost on this outer surface, and / or detecting the presence of stubborn dirt on this outer surface, as a function of the climatic conditions outside the vehicle, such as the temperature, the dew point and the presence or not of rain, or the presence of frost and / or dirt on the external surface of the windshield 18 to be cleaned.

The projection of the first, second and third liquids can be concomitant, or not, according to the wishes of the user or according to the information provided by the sensors.

Such a cleaning device 10 allows for example when stubborn dirt is "hung" on the outer surface of the windshield 18, to spray the second liquid having detergent properties so as to peel them off.

Advantageously, during the projection of the second and / or third liquid (s), the wiper arms are driven in sweeping at a speed lower than the lowest of the wiping speeds. This reduced speed makes it possible to spread the second and / or third liquid (s).

As the scanning speed is low, the duration of contact between the second and / or third liquid (s) and stubborn dirt and / or frost and / or ice is prolonged, which promotes the detergent action of the second liquid and / or increases the effectiveness of the third liquid.

Alternatively, one can use, for example, a first and a second liquid which does not have

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 detergent properties. When these two liquids are mixed, the liquid obtained has detergent properties. Thus, the liquid which consists of the mixture of the first and of the second liquid makes it possible to facilitate the cleaning of the external surface of the windshield 18.

According to another variant, similarly, the first and third liquids may not have deicing properties. When mixed, the liquid obtained has de-icing properties.

In addition, during the mixing of the first and the second liquid, an exothermic reaction can occur which makes it possible to heat the mixture and thus increase its temperature in order to increase its detergent activity, and to facilitate the melting of the frost present on the windshield 18.

FIG. 2 shows a second embodiment of the cleaning device 10 for the windshield 18.

The cleaning device 10 comprises the first circuit 20, the first liquid of which, which circulates in the first pipe 32, is sprayed onto the windshield 18 by the projection devices 34 fixed on the arms 12 movable in alternating rotation. The third circuit 52 is in parallel with the first circuit 20. It projects onto the windshield 18, by a second projection device 70 which is for example a projection nozzle carried by the front cover of the vehicle, the third liquid, which has detergent properties.

The nozzle 70 projects the third liquid onto an area 71 of the outer surface of the windshield 18. The area 71 is here smaller than the areas 14 to be cleaned. However, the adjustment of the nozzle 70 makes it possible to adapt the position and the dimensions of the area 71 as a function of the area of the windshield 18 which requires significant defrosting.

The spray nozzle 70 is advantageously located in a central position relative to the zones 14 of the windshield 18 to be cleaned.

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 The projection nozzle 70 can be orientable relative to the zone 71 of the exterior surface of the windshield 18 as a function of at least one parameter of the vehicle such as the aerodynamic flow or the speed of the vehicle.

The control of the orientation of the projection nozzle 70 can also be obtained by a manual control actuated by the driver of the vehicle.

The first circuit 20 comprises two conduits 72 and 74 which come from the reservoir 22 and which connect to the first pipe 32.

According to a variant, the second conduit 74 is connected to a reservoir, not shown, comprising a liquid of a nature and / or of composition and / or of physical characteristics different from those of the first liquid.

The first conduit 72 comprises the pressurizing device 36 which raises the pressure of the first liquid at a first pressure as well as a first valve 73 of the non-return valve type.

The second conduit 74 successively comprises, from upstream to downstream according to the flow of the first liquid, an intermediate heating tank 76, a pressurizing device 78, a detergent container 80 and a first valve 82 of the check valve type. return.

According to a variant, the second conduit 74 is connected to a reservoir, not shown, comprising a liquid of a nature and / or of composition and / or of physical characteristics different from those of the first liquid. Thus the liquid which circulates in the second conduit 74 is a mixture of the first liquid with another liquid.

The first liquid is admitted by gravity into the intermediate heating tank 76 which makes it possible to increase its temperature in order to increase its detergent activity, and possibly to facilitate the melting of the frost present on the windshield 18.

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 The first heated liquid is then pressurized by the device 78, which is preferably a pump, which raises the pressure of the first heated liquid to a second pressure greater than the first pressure of the first liquid. In the following description, such a pump will be called a high pressure pump 76, while the pump constituting the pressurizing means 36 will be called a low pressure pump 36.

The detergent container 80 consists of a chamber in which is disposed a detergent substance which can be a solid element such as a tablet. Thus, when the first heated liquid passes through the chamber, it is loaded with detergent substance. When the detergent substance is a tablet, it gradually dissolves on contact with the first heated liquid.

The first liquid which leaves the detergent container 80 has a strong detergent activity.

The third pipe 64 comprises a bifurcation 84 between the pump 60, advantageously high pressure, and the nozzle 70. Thus, a third conduit 86 connects the bifurcation 84 to a connection point 88 of the first pipe 32.

When the pump 60 is activated, controlled valves 90 and 92 can be opened to allow the circulation of the third liquid in the third conduit 86 and the third pipe 64.

The opening of the valve 90 interposed in the third conduit 86 makes it possible to mix the third de-icing liquid with the first liquid and to spray the mixture thus obtained by the nozzles 34 of the wipers 12.

The opening of the valve 92 interposed in the third pipe 64 makes it possible to spray the third "pure" liquid on the area 71 of the windshield 18.

A control system, not shown, makes it possible to activate or not the heating means 76, the pumps 36, 60 and 78, as well as the drive motors in scanning of the

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 windscreen wipers 12, and the valves 90 and 92 according to the state of soiling and / or icing of the windshield 18, in particular of the zone to be cleaned 14.

Thus, when dirt is simply deposited on the windshield 18, only the pump 36 and the wiper drive motors 12 are activated to clean the area 14.

Non-return valves 82 and 96 interposed in the first and the third conduit 72 and 86 respectively make it possible to prevent the circulation of the first fluid in the conduits 72 and 86.

When stubborn soiling is attached to the zone 14 of the windshield 18, it is advantageous to activate the heating means 76, the high-pressure pump 78 as well as the wiper drive motors 12. The first heated liquid having detergent properties is then sprayed onto the windshield 18. The high pressure and the temperature of the first liquid make it possible to improve its detergent effect.

When frost and / or ice is formed on the windshield 18, several actions are possible.

One of them consists in activating the high pressure pump 60 and in opening the valve 90 in addition to the elements activated in the previous case. The third liquid then mixes with the first heated liquid and the mixture thus obtained is sprayed at high pressure on the windshield 18 by the nozzles 34 of the wipers 12. The increase in the temperature of the third liquid due to the first heated liquid , promotes the melting of frost and / or ice.

Another action consists in activating the pump 60 and in opening the valve 92 previously or concomitantly with the commands carried out according to the preceding action. Thus, the third pure liquid sprayed on the area 71 to be defrosted from the windshield 18 further increases the melting of the frost and / or ice.

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 According to these different examples, it is preferable that the alternating speed of rotation of the wipers 12 is less than the smallest of the wiping speeds, so as to further improve the detergent activity of the heated liquid and / or the deicing power of the third liquid.

A third embodiment of the cleaning device 10 for the windshield 18 is shown in FIG. 3.

The cleaning device 10 comprises the first circuit 20, the first liquid of which circulates in the first pipe 32 is sprayed onto the windshield 18 by a third projection device 100 which here consists of nozzles carried by the front cover of the vehicle . The first liquid is then sprayed onto the zone 14 to be cleaned from the windshield 18 which is delimited substantially by a rectangle.

The second projection device 70 here makes it possible to project onto the windshield 18 the second and the third liquid circulating in the second and third pipes 62 and 64 which are here arranged in parallel.

The second circuit 50 makes it possible to project onto the windshield 18 a hot product having detergent properties.

The heating of the second liquid is obtained by its mixture and its exothermic reaction with a reactive product stored in a fourth tank 102.

The reactive product can be a solid element, such as a powder or crystals, which dissolves on contact with the second liquid.

According to a variant, the reactive product is a fourth liquid. To obtain the desired temperature of the second liquid, it is necessary to control the exothermic reaction. To do this, the reactive product is dosed.

A mixing chamber 104 is inserted in the second pipe 62 and a fourth conduit 106 connects it to the fourth tank 102.

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 Two valves 108 and 110 are located in the fourth conduit 106 upstream and downstream respectively of a metering chamber 112.

The cleaning device 10 may also include a sensor which is fixed to the windshield 18 and which provides information, in particular information representative of the state of cleanliness or icing of its external surface. The information is then transmitted to an electronic control unit 114 which makes it possible in particular to activate the pumps 36, 58 and 60, the valves 108 and 110 as well as the motor for alternating rotation of the windscreen wipers (not shown).

When stubborn soiling is detected and the first liquid is not sufficient to clean it, the electronic control unit 114 allows the dosing of the reactive product.

To do this, the electronic control unit 114 causes the downstream valve 110 to close and the upstream valve 108 to open so as to fill the metering chamber 112 with reactive product. When this operation is complete, the upstream valve 108 is closed and the downstream valve 110 is open at the same time as the high pressure pump 58 is started.

When the reactive product is a liquid, it can be metered directly into the metering chamber 112 by a pump, not shown.

The second liquid then mixes with the reactive product in the mixing chamber 104. An exothermic reaction then takes place which causes an increase in the temperature of the second liquid.

The second heated liquid has a strong detergent activity which, when sprayed onto the outer surface of the windshield 18, takes off even stubborn dirt.

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 The second heated liquid can also make it possible to increase the efficiency of the third liquid which has de-icing properties. Indeed, their mixture is a liquid having the two properties which allow the melting of frost and / or ice, that is to say a hot and defrosting liquid.

According to a variant, represented in FIG. 4, it is the liquid of the third circuit 52 which is heated. Here, heating is obtained by mixing and exothermic reaction of the third liquid with a second reactive product stored in a fifth tank 120.

The mixing and the exothermic reaction are carried out directly on the windshield 18 of the vehicle.

The third liquid and the second reactive product are sprayed onto the windshield by separate nozzles 122 and 124 respectively.

Thus the heated liquid makes it possible on the one hand to increase the efficiency of the third liquid for melting the frost and / or the ice formed on the windshield 18, but also to increase the detergent activity of the first and / or second liquids sprayed from the nozzles 34.

A fourth embodiment of the cleaning device 10 for the windshield 18 is shown in FIG. 5.

The cleaning device 10 comprises the first circuit 20 in the first pipe 32 in which is interposed a pilot bifurcation 130 which allows the distribution between a point of diversion 131 of the downstream section of the first pipe 32 and a fifth conduit 132.

The second pipe 62 has a connection point 134 with the fifth pipe 132 which is located between the detergent container 80 and the mixing chamber 104 allowing an exothermic reaction.

Such a cleaning device 10 can then operate in three main modes.

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 The electronic control unit (not shown), controls in particular valves or flaps 136, 138, 140 and 142, the pumps 36, 78, the controlled bifurcation 130 for the routing of the first liquid in the cleaning device 10.

The first mode called "classic" mode allows the projection (at low pressure by the pump 36 and the first circuit 20) on the windshield 18 of the first liquid stored in the reservoir 22. The controlled bifurcation 130 allows the passage of the first liquid only in the first line 32.

The first mode is activated when dirt is present on the outer surface of the windshield 18. A check valve 136 of the non-return type makes it possible to prevent the first liquid from going back into the second pipe 62.

The second mode causes the windshield 18 to defrost. It consists in at least partially diverting the flow rate of the first liquid in the fifth conduit 132, so as to supply the mixing chamber 104. A predetermined quantity, by dosing in the chamber metering 112, the reactive product stored in the fourth tank 102 is then introduced into the mixing chamber 104 so as to cause an exothermic reaction to raise the temperature of the first liquid. The first heated liquid is then projected onto the windshield 18 by the nozzles 34 of the wipers 12.

The reactive product can, in addition to causing the exothermic reaction, modify the properties of the first liquid, for example by reducing its melting point.

The third mode allows the cleaning of stubborn dirt fixed on the outer surface of the windshield 18. The high pressure pump 78 is then activated so as to cause the passage of the first liquid through the detergent container 80, to give it the properties second liquid detergents. When it passes through the mixing chamber 104, a predetermined quantity of the reactive product is advantageously obtained for it.

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 mixed so as to increase its temperature, and therefore the effectiveness of its detergent properties.

The reactive product can, in addition to causing the exothermic reaction, modify the properties of the second liquid, for example by increasing its detergent power.

For the second and third operating modes, it is advantageous for the windscreen wipers 12 to rotate at a speed lower than the lowest of the wiping speeds, so as to optimally spread the liquids and increase their efficiency .

Such a cleaning device 10 allows the use of a liquid common to all applications, whether it is a simple cleaning of the windshield 18, a cleaning of stubborn dirt or the removal of frost and / or ice. Thus, preferably a liquid will be used which allows the windshield 18 to be cleaned for the "conventional" mode. The preceding description is not limiting, in fact the various embodiments of the cleaning device 10 can be combined with one another.

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Claims (36)

CLAIMS 1. Device for cleaning (10) a window (18), in particular a window (18) of a motor vehicle covered at least partially with frost and / or dirt, of the type which comprises at least one mechanism wiper, a first cleaning circuit (20) for spraying a first liquid onto the window (18), and which comprises a reservoir (22) of the first liquid, first means (36) for pressurizing the first liquid and at least one first device (34) for projecting the first liquid onto the window (18), and of the type in which the first reservoir (22), pressurizing means (36) and projection device (34) are interconnected, characterized in that it comprises at least a second cleaning circuit (50) for projecting onto the window (18) a second liquid of a nature and / or composition and / or physical characteristics different from those of the first liquid. 2. Cleaning device (10) according to the preceding claim, characterized in that it comprises means for heating the second liquid. 3. Cleaning device (10) according to the preceding claim, characterized in that the means for heating the second liquid comprise an electrical heating resistance. 4. Cleaning device (10) according to one of claims 2 or 3, characterized in that the heating means consist of an exothermic reaction, by mixing the second liquid with at least one reactive product. 5. Cleaning device (10) according to the preceding claim, characterized in that the reactive product is a fourth liquid. 6. Cleaning device (10) according to the preceding claim, characterized in that the mixing of the second and the fourth liquid is carried out on the window (18) to be cleaned. <Desc / Clms Page number 20>  7. Cleaning device (10) according to claim 4, characterized in that the reactive product is a first solid element such as a powder or crystals which dissolves on contact with the second liquid. 8. Cleaning device (10) according to one of claims 4, 5 or 7, characterized in that the mixing of the second liquid and the reactive product is carried out in the second cleaning circuit (50). 9. A cleaning device (10) according to any one of claims 5, 6 or 8, characterized in that the fourth liquid consists of at least part of the liquid contained in the first tank (22). 10. Cleaning device (10) according to any one of the preceding claims, characterized in that it comprises second means (58) for pressurizing the second liquid. 11. Cleaning device (10) according to the preceding claim, characterized in that the first and second means (36, 58) for pressurizing are a single means for pressurizing. 12. Cleaning device (10) according to claim 10, characterized in that the second pressurizing means (58) raise the pressure of the second liquid to a second pressure greater than a first pressure of the first liquid obtained by the first means (36) pressurization. 13. Cleaning device (10) according to any one of the preceding claims, characterized in that the second liquid is projected onto the window (18) to be cleaned by a second projection device. 14. Cleaning device (10) according to the preceding claim, characterized in that at least one of the projection devices (34, 70) comprises at least one projection nozzle. 15. Cleaning device (10) according to the preceding claim, characterized in that at least one of the nozzles <Desc / Clms Page number 21>  projection is carried by a mobile element, such as an arm or a blade of the wiper mechanism. 16. Cleaning device (10) according to claim 15, characterized in that at least one of the projection nozzles is carried by a fixed element, such as a body element of a vehicle. 17. Cleaning device (10) according to the preceding claim, characterized in that at least one of the nozzles is located in a central position relative to the area of the window (18) to be cleaned. 18. Cleaning device (10) according to one of claims 16 or 17, characterized in that at least one of the projection nozzles is orientable relative to the window (18) to be cleaned according to at least one vehicle parameter, such as aerodynamic flow or vehicle speed. 19. Cleaning device (10) according to any one of the preceding claims, characterized in that the second liquid has detergent properties. 20. Cleaning device (10) according to the preceding claim, characterized in that the second liquid consists of a detergent solution stored in a second tank (54). 21. Cleaning device (10) according to claim 19, characterized in that the second liquid is obtained by mixing a detergent substance with a fifth liquid. 22. Cleaning device (10) according to the preceding claim, characterized in that the fifth liquid consists at least in part of the liquid contained in the first tank (22). 23. Cleaning device (10) according to one of claims 21 or 22, characterized in that the detergent substance is a solid element such as a tablet, which dissolves on contact with the fifth liquid. <Desc / Clms Page number 22>  24. Cleaning device (10) according to any one of the preceding claims, characterized in that the second liquid has de-icing properties. 25. Cleaning device (10) according to the preceding claim, characterized in that the second liquid consists of a deicing solution stored in a second tank (56). 26. Cleaning device (10) according to any one of the preceding claims, characterized in that it comprises a third cleaning circuit (52) for projecting onto the window (18) a third liquid of nature and / or of composition and / or physical characteristics different from those of the first and second liquids. 27. A device for cleaning (10) a window (18) according to any one of claims 1 to 25 characterized in that the first and the second circuits (20, 50) comprise at least a first and / or a second pipe (32, 62) respectively which connects together the different components of each circuit (20, 50). 28. Cleaning device (10) according to the preceding claim taken in combination with claim 26, characterized in that the third circuit (52) comprises a third pipe (64) which interconnects the constituent elements of this third circuit (52 ). 29. Cleaning device (10) according to one of claims 27 or 28, characterized in that at least two of said first and / or second and / or third pipes (32, 62, 64) are interconnected by a additional conduit (86, 132) which extends from a branch point (84, 131) of one of the pipes (64, 32) to a connection point (88, 134) of the other pipe (32 , 62). 30. Cleaning device (10) according to any one of claims 28 or 29, characterized in that at least two of said circuits (20, 50, 52) include common elements, such as a liquid reservoir (22 ), means of placing under <Desc / Clms Page number 23>  pressure, a projection device (34), or a section of pipe. 31. Cleaning device (10) according to any one of the preceding claims, characterized in that it comprises control means (114) of the projection of at least one of the liquids. 32. Cleaning device (10) according to the preceding claim, characterized in that the control means (114) for projecting liquids make it possible to simultaneously project the first and second and / or the third liquid. 33. Cleaning device (10) according to one of claims 31 or 32, characterized in that the control means (114) are actuated manually by the user of the vehicle. 34. Cleaning device (10) according to any one of claims 31 to 33, characterized in that the control means (114) are actuated as a function of the climatic conditions external to the vehicle, such as the temperature, the dew point and whether or not there is rain. 35. Cleaning device (10) according to any one of claims 31 to 34, characterized in that the control means (114) are actuated as a function of the presence of frost and / or dirt on the external surface of the window (18) to be cleaned. 36. Cleaning device (10) according to any one of the preceding claims, characterized in that the wiper mechanism (12) comprises a wiper arm which is driven in alternating sweep according to at least a first speed which allows the window (18) to be cleaned, and in that when at least one of the second and / or third liquid is sprayed onto the window (18), the wiper arm is driven at a second speed lower than the first to allow spreading of the second and / or third liquid over an area of the glass (18) to be cleaned.