WO2016193562A1

WO2016193562A1 - Device for de-icing and defogging a glazing element of a motor vehicle

Info

Publication number: WO2016193562A1
Application number: PCT/FR2016/051118
Authority: WO
Inventors: Nicolas RILAT; Gerard Jeuffe; Frederic Guidez
Original assignee: Peugeot Citroen Automobiles Sa
Priority date: 2015-06-03
Filing date: 2016-05-12
Publication date: 2016-12-08
Also published as: FR3037005B1; FR3037005A1

Abstract

The invention relates to a glazing element (3) of a motor vehicle including a de-icing and defogging system (2), said element including a bottom wall (5) and a top wall (4) mounted on the bottom wall, the system (2) including a supply opening (21) for drawing warm air into the element and a discharge opening (23, 24) for extracting air, the element including an edge capable of supporting the top wall and creating an air-circulation space (19) of a constant thickness (E), between both walls (4, 5), the air-circulation space including an enhanced viewing area (28) in which the thickness (e) of said space is less than the constant thickness (E), the supply opening leading into the enhanced viewing area.

Description

DEVICE FOR DEFROSTING AND DE-WRAPPING A GLASS ELEMENT OF A VEH ICU THE AUTOMOBILE

The invention relates to the field of motor vehicles, and more specifically to the defrosting and demisting of a glazing element of a motor vehicle.

In general, motor vehicles are provided with a system for defrosting and demisting a glazing element, in particular a telescope, this system being generally composed of:

- a silkscreen, composed of ceramic and silver paste, which when electrically powered, produces heat to defrost and demist the glazing element,

two electrical collectors arranged on each side of the glazing element and connected by a plurality of filaments,

de-icing lugs, providing the electrical interface between the deicing network and the ignition beam, these lugs being welded to the collectors.

This system allows both to diffuse heat for defogging the inner face of the glazing element, and to diffuse heat for defrosting the outer face of the glazing element.

The glass surface of the glazing element allows good conduction of heat. However, the glass does not make it possible to produce a glazing element of sculptural form, that is to say for example a bezel provided with complex shapes. That is why, for the purpose of producing sculptural glasses, a polymeric material such as a polycarbonate is adopted, making it possible to manufacture spectacles that can fit any motor vehicle profile.

However, this device has its limits. Indeed, polycarbonate is much less conductive than glass, and the heat that must cross the bezel less easily reaches the outer surface of the bezel. Thus, the defrosting of the polycarbonate bezel can be achieved in good conditions only at the cost of higher power consumption (accompanied by heat loss), a longer defrosting time, and a larger number of filaments. EP1 1 1 8484 discloses an insulating glazing system, for a motor vehicle, comprising a first wall of polymeric material disposed in a motor vehicle window opening, and a second wall of polymer material disposed in the window opening. The two walls are spaced a predetermined distance apart from one another to form an air circulation space. In this circulation space, air circulates to heat the two walls, and thus defrost and demist the bezel of a motor vehicle.

However, the use of such a system of the prior art has some disadvantages. The speed of defrosting and defogging is altered by the loss of calories from the hot air injected between the walls, as soon as it arrives at the injection site.

An object is to provide a defrosting and demisting system of a glazing element of a motor vehicle to isolate an area of the glazing element and accelerate the deicing and demisting process in this zone.

For this purpose, it is proposed, firstly, a glazing element of a motor vehicle comprising a defrosting and defogging system, this glazing element comprising a lower wall and an upper wall mounted on the lower wall, the defrosting and demisting system comprising:

at least one supply orifice for the infiltration of hot air into the glazing element, by means of air injection,

at least one discharge orifice for extracting air,

in which

the glazing element comprises a periphery projecting from an outer edge of the bottom wall, able to serve as a support for the upper wall and to create an air circulation space of a constant thickness, between the two walls,

the air circulation space comprises an improved zone of vision in which it has a thickness less than the constant thickness,

- The supply port opens into the improved viewing area, so as to concentrate the supply of hot air.

The area of improved vision, wherein the air circulation space has a thickness less than the constant thickness of the air circulation space over the remainder of the glazing element, allows hot air to be concentrated in an area, improves defrosting and defogging performance, and minimizes defrosting and defrosting time. demisting.

[001 1] Various additional features may be provided, alone or in combination:

the two walls each comprise several sections having different radii of curvature;

- The bottom wall comprises air gap stops, adapted to retain the upper wall and to maintain the air circulation space of constant thickness, between the upper wall and the lower wall;

- The walls are secured by means of a bonding;

- The evacuation port opens on the inside of the motor vehicle;

a heating resistor is placed near the supply orifice, so as to rapidly increase the temperature of the air entering the air circulation space;

- A temperature sensor is integrated in the glazing element.

It is proposed, secondly, a motor vehicle comprising the glazing element as previously described.

Other features and advantages of the invention will appear more clearly and concretely on reading the following description of embodiments, which is made with reference to the accompanying drawings in which:

FIG. 1 is a perspective view of a motor vehicle equipped with a defrosting and demisting system for a glazing element,

FIG. 2 is an exploded perspective view of the glazing element of FIG. 1;

- Figure 3 is a partial sectional view, in perspective, of the glazing element of Figure 1, with medallions two details on an enlarged scale,

FIG. 4 is a perspective view of the defrosting and demisting system of the glazing element, with medallions of three details on an enlarged scale,

FIG. 5 is a partial perspective view of a motor vehicle equipped with the de-icing and defogging system of the glazing element, this glazing element comprising an improved zone of vision,

- Figure 6 is a partial sectional view of the defrosting and demisting system of the glazing element, the glazing element comprising an air circulation space.

In Figure 1 is shown a vehicle 1 automobile comprising a system 2 for defrosting and demisting a glazing element 3.

As illustrated in Figure 2, the glazing element 3 comprises an upper wall 4 and a lower wall 5.

The upper wall 4 comprises a central section 6 bordered by a first lateral section 7 and a second lateral section 8. The two lateral sections 7, 8 have the same radius of curvature, this radius being greater than the radius of curvature of the central section 6. To pass from the two sections 7, 8 lateral to the central section 6, the upper wall 4 has fillets 9.

In the same way, the lower wall 5 comprises a main section 10 bordered by a primary lateral section 1 1 and a secondary lateral section 12, and comprises secondary leaves 1 3 connecting between the lateral sections 1 1, 12 and the main section 1 0.

In order to obtain a glazing element 3, the upper wall 4 must be assembled to the lower wall 5. The bottom wall 5 comprises a periphery 14 projecting from an outer edge 15 of the bottom wall 5, the periphery 14 surrounding the entire bottom wall 5. The periphery 14 comprises an upper end surface 16 adapted to receive the upper wall 4 for mounting on the lower wall 5. The lower wall 5 also includes abutments 1 7 air gap, disposed on the leaves 1 3 secondary.

In order to secure the upper wall 4 to the lower wall 5, glue, represented by bold lines, in Figure 3, is deposited between the upper end surface 16 of the periphery 14 and the holidays 9 Thus, when the upper wall 4 is deposited on the lower wall, a lower end surface 18 of the upper wall 4 comes into contact with the upper end surface 14 of the periphery 14 and the secondary leaves 13. The two walls 4, 5 are then integral, under the action of the glue. In addition to serve as a fulcrum and securing the upper wall 4, the periphery 14 and the stops 1 7 gap have the function of spacing the upper wall 4 of the lower wall 5. Indeed, between the two walls 4, 5 remains a space 1 9 of air circulation having a constant thickness E. This air circulation space 1 9 makes it possible to distribute hot air between the two walls 4, 5, thus the calories supplied by the hot air pass through the upper wall 4 in order to defrost the glazing element 3, and the lower wall 5 to defog the glazing element 3.

The hot air comes from an automobile air conditioning system 20, which is connected to a supply orifice 21 by a pipe 22, as shown schematically in FIG. 4.

Fresh or cooled air contained in the air circulation space 19 is expelled by two orifices 23, 24 of discharge. Advantageously, the lower wall 5 comprises nozzles 25, 26, 27, a first nozzle 25 is disposed on the supply orifice 21 while the second nozzle 26 and the third nozzle 27 are arranged on the two orifices 23, 24 of the nozzle. 'evacuation.

The first nozzle 25 to connect the pipe 22 to the supply port 21, for the injection of hot air in the space 1 9 air flow.

The second nozzle 26 and the third nozzle 27 allow to connect the orifices 23, 24 of discharge to a means for conveying fresh or cooled air, leading for example in the trunk of the vehicle 1 automobile.

According to one embodiment, the second nozzle 26 and the third nozzle 27 are left in free exhaust, to ventilate and heat the passenger compartment of the vehicle 1 automobile.

The defrosting and defogging system 2 of the glazing element 3 makes it possible to control the speed and efficiency of the defrosting and defogging. Indeed, the glazing element 3 comprises an improved zone 28 of vision, illustrated in FIG. 5, this zone 28 of improved vision delimits a sector of the glazing element 3 requiring precise control of the defrosting and defogging. zone 28 improved vision is one of the areas most sought after by the driver of the vehicle 1 automobile. The control of defrosting and defogging is achieved through the variation of the thickness E of the space 1 9 of air circulation. Thus, the heating of the upper wall 4 and the lower wall will be faster in the zone 28 of improved vision, the thickness e of the air circulation space 19, in the zone 28 of improved vision, being smaller than the thickness E of the circulation space 1 9 of the remainder of the glazing element 3, as can be seen in FIG.

It is possible to reduce only the defrosting time of the glazing element 3, by varying the thickness of the upper wall 4. And, conversely, it is possible to reduce only the defogging time of the glazing element 3, by varying the thickness of the lower wall.

It is possible to better control the defrosting and demisting areas to prioritize, by changing the location and the number of nozzles.

The temperature and the speed of the air injected into the space 1 9 of air flow also affect the defrosting and defogging performance of the glazing element 3. Thus, according to one embodiment, a heating resistor is integrated with the first nozzle 25, in order to rapidly increase the temperature of the air injected into the air circulation space 19.

According to another embodiment, a temperature sensor is integrated in the glazing element 3, in order to control the temperature of the injected air at the detected outside temperature.

The defrosting and demisting system 2 which has just been described has several advantages.

First, the system 2 allows the defrosting and demisting of a glazing element 3 of polymer material such as polycarbonate and having complex shapes.

The system 2 allows to target a specific area of the glazing element 3 for defrosting and demisting, and reduces the defrosting and defogging time of the glazing element 3 in this area.

The system 2 can cool the passenger compartment of the vehicle 1, by the diffusion of fresh air or cooled by the second nozzle 26 and the third nozzle 27. Finally, the system 2 allows the use of a glazing element 3 not requiring filaments, the direct vision through the glazing element 3 is no longer disturbed by the presence of such filaments.

The glazing element which has just been described has many advantages. Made of a polymeric material such as polycarbonate, the glazing element may have complex shapes, which are not achievable using mineral glass. The presence of a lower wall 5 and an upper wall 4 mounted on the lower wall 5 forms a double glazing ensuring thermal insulation summer / winter, and sound insulation. When the glazing element is a rear window, the zone 28 of improved vision is advantageously the retro-vision zone. The supply of the air circulation space by the air conditioning unit of the vehicle ensures the entry of hot, dry air into this space 1 9.

Claims

1. Glazing element (3) of an automobile vehicle (1) comprising a defrosting and demisting system (2), said glazing element (3) comprising a lower wall (5) and an upper wall (4) mounted on the wall (5) below, the system (2) defrosting and demisting comprising:

at least one supply orifice (21) for the infiltration of hot air into the glazing element (3), by means of air injection, at least one orifice (23, 24) of exhaust for extracting air, characterized in that

the glazing element (3) comprises a periphery (14) projecting from an outer edge (15) of the lower wall (5), able to serve as a support for the upper wall (4) and to create a space (1 9) of air circulation of constant thickness (E) between the two walls (4, 5),

the air circulation space (1 9) comprises an area (28) of improved vision in which it has a thickness (e) less than the constant thickness (E),

- The supply orifice (21) opens into the area (28) of improved vision, so as to concentrate the supply of hot air.

2. Element (3) glazing according to claim 1, characterized in that the two walls (4, 5) each comprise a plurality of sections (6, 7, 8; 10, 1 1, 12) having different radii of curvature.

3. element (3) glazing according to any one of the preceding claims, characterized in that the wall (5) below comprises abutments (17) air gap, adapted to retain the wall (4) and maintain the upper l space (19) of air circulation of constant thickness (E) between the upper wall (4) and the lower wall (5).

4. element (3) glazing according to any one of the preceding claims, characterized in that the walls (4, 5) are secured by means of a bonding.

5. element (3) glazing according to any one of the preceding claims, characterized in that the orifice (23, 24) of discharge opens on the inside of the vehicle (1) automobile.

6. Element (3) glazing according to any one of the preceding claims, characterized in that a heating resistor is disposed near the orifice (21) of supply, so as to rapidly increase the temperature of the air entering the space (19) of air circulation.

7. element (3) glazing according to any one of the preceding claims, characterized in that a temperature sensor is integrated in the element (3) of glazing.

8. Vehicle (1) automobile comprising a glazing element (3) according to any one of the preceding claims.