CN109916859A - A kind of glass and fogging detection device for fogging identification - Google Patents

Abstract

The invention relates to the technical field of vehicle windshield glass, in particular to a glass for fogging identification and a fogging detection device. The device includes a light source emitting device, a light source receiving device and glass, wherein the glass includes a glass body, and a first inclined surface is provided on the outer surface of the glass body. The outer surface of the glass body is also provided with a reflected light receiving area, which is used to connect the light source receiving device to receive the reflected light that is totally reflected through the inner surface of the glass body. It can be applied to the fogging detection of glass. Since the detection light is vertically incident, it avoids the problem of decreased measurement accuracy caused by different refraction angles caused by different glass thicknesses, and the glass is integrally formed to solve the problem of windshield material. The problem of the decrease in measurement accuracy caused by the difference.

Description

A kind of glass and fogging detection device for fogging identification

technical field

The invention relates to the technical field of vehicle windshield glass, in particular to a glass for fogging identification and a fogging detection device.

Background technique

At present, the sensors used in the automatic start-stop control of defrosters in the industry are mainly dew point sensors. By measuring the ambient temperature, ambient humidity, and glass surface temperature, the dew point temperature of the glass surface in the current environment is obtained by formula calculation, and then by comparing with the glass surface temperature The difference between the values determines whether the glass is fogged, and then controls the defroster actuator to work to remove the fog on the surface of the windshield. However, it is greatly affected by air flow, uneven temperature distribution on the glass surface, installation position, etc. Although automatic control of defrosting and defogging can be realized, the redundant defogging time is too long, the control accuracy is poor, and the parameters are calibrated between different models. The values do not match.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a glass for fogging identification and a fogging detection device, so as to solve the problem that the measurement accuracy is lowered due to the difference in the material and thickness of the windshield.

In order to achieve the above purpose, the present invention provides a glass for fogging identification, including the following technical solutions of the glass:

Glass solution 1: A glass used for fogging identification, including a glass body, and a convex first slope is arranged on the outer surface of the glass body, and the first slope is used to connect the light source emitting device so that the incident light follows the first slope It is vertically incident on the inner surface of the glass body, and the outer surface of the glass body is also provided with a reflected light receiving area, and the reflected light receiving area is used to connect a light source receiving device to receive total reflection through the inner surface of the glass body. of reflected light.

The beneficial effect is that the glass scheme 1 proposes a glass with a first inclined plane, the first inclined plane is used to connect the light source emitting device so that the incident light is vertically incident on the inner surface of the glass body, and the outer surface of the glass body is also provided with a reflected light receiving area, This area is used to connect the light source receiving device to receive the reflected light that is totally reflected by the inner surface of the glass body. According to the optical principle of total reflection, the change of the inner surface of the glass is detected, which can be applied to the fogging detection of the glass. Since the detection light is vertically incident, it avoids the problem of decreased measurement accuracy caused by different refraction angles caused by different glass thicknesses, and the glass is integrally formed to solve the problem of decreased measurement accuracy caused by different windshield materials.

Glass solution 2: On the basis of glass solution 1, the reflected light receiving area is a second inclined surface, and the reflected light that is totally reflected on the inner surface of the glass body enters the second inclined surface vertically through the second inclined surface Connected light source receiver.

Glass solution 3: On the basis of the first glass solution or the second glass solution, the inclination angle R of the first slope is determined according to the refractive index of air, the refractive index of water and the refractive index of glass.

Glass solution 4: On the basis of glass solution 3, r≤R<r ₀ , where r is the critical angle of total reflection between glass and air, and r ₀ is the critical angle of total reflection between glass and water.

The present invention provides a fogging detection device, comprising the technical solutions of the following devices:

Device scheme 1: A fogging detection device, including a light source emitting device, a light source receiving device and glass, the glass includes a glass body, a convex first slope is provided on the outer surface of the glass body, and the outer surface of the glass body is further provided There is a reflected light receiving area; the light source emitting device is arranged on the outer surface of the first inclined plane, and is used to vertically incident the incident light on the inner surface of the glass body, and the light source receiving device is arranged on the reflected light receiving area , for receiving the reflected light that is totally reflected by the inner surface of the glass body.

Device solution 2: On the basis of device solution 1, the reflected light receiving area is a second slope, and the reflected light that is totally reflected on the inner surface of the glass body enters the second slope vertically through the second slope connected to the light source receiving device.

Device solution 3: On the basis of device solution 1 or device solution 2, the light source emitting device and the light source receiving device are horizontally separated by a set distance, and the set distance is based on the inclination of the first slope and the thickness of the glass body Sure.

Device solution 4: On the basis of device solution 3, the inclination angle R of the first slope is determined according to the refractive index of air, the refractive index of water and the refractive index of glass.

Device solution 5: On the basis of device solution 4, r≤R<r ₀ , where r is the critical angle of total reflection between glass and air, and r ₀ is the critical angle of total reflection between glass and water.

Description of drawings

Fig. 1 is a kind of structural schematic diagram of the glass used for fogging identification;

2 is a schematic diagram of a boss-type structure of a glass used for fogging identification;

3 is a schematic diagram of a fogging detection device in a state where the glass surface is clean;

4 is a schematic diagram of a fogging detection device in a state where the glass surface is fogged;

5 is a schematic diagram of a fogging detection device in a state of uneven fogging on the glass surface;

Fig. 6 is a kind of groove structure schematic diagram of the glass used for fogging identification;

FIG. 7 is a schematic diagram of a concave-convex structure of a glass used for fogging identification.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings.

The present invention provides a glass for fogging identification. As shown in FIG. 1 , it includes a glass body 1. On the outer surface of the glass body 1, at least one inclined surface is set along the direction of the glass body, including a first inclined surface 2. The outer surface of the main body 1 is also provided with a reflective light receiving area 3, wherein the reflective light receiving area 3 is used to receive the light that is totally reflected by the inner surface of the glass body. As shown in FIG. 2, the reflective light receiving area 3 is preferably the second The bevel 4, therefore, forms the boss 5.

The present invention provides a fogging detection device, including a light source emitting device 6, a light source receiving device 7 and the above-mentioned glass for fogging identification, as shown in FIG. 3, including a glass body 1 and a boss 5 integrally formed with the glass body The boss is arranged on the outer surface of the glass body and protrudes outward, wherein the boss includes two inclined surfaces, namely a first inclined surface 2 and a second inclined surface 4, and the slope bottoms of the two inclined surfaces are connected with the outer surface of the glass body 1 .

In order to avoid the influence of refraction on the measurement accuracy, both the emission and reception of the light source are on the surface of the inclined surface of the vertical boss. Therefore, the light source emission device 6 is arranged on the outer surface of the first inclined surface 2, and is used to vertically incident the incident light to the glass body 1. On the inner surface, the light source receiving device 7 is arranged on the outer surface of the second inclined surface 4 for receiving the reflected light which is totally reflected by the inner surface of the glass body 1 .

According to the optical principle of total reflection, when the glass surface is clean, the critical angle of total reflection is the first set angle r formed by the glass medium and the air medium, and when the glass surface is fogged, the critical angle of total reflection is formed by the glass medium and the water medium. The second set angle r ₀ , wherein, since the refractive index of air is smaller than that of water, r<r ₀ , it can be seen that the angle R between the first inclined plane 3 and the direction of the glass body (the angle less than 90°) ) within the first set angle r and the second set angle range r ₀ , that is, r≤R<r ₀ ; the second slope is symmetrically arranged with the first slope along the vertical direction of the glass body.

The light source emitting device 6 and the light source receiving device 7 are separated by a set distance, wherein the set distance is related to the inclination angle of the inclined plane and the thickness of the glass body.

The working process of the present invention is as follows:

As shown in Figure 3, the light from the light source emitting device enters the glass vertically and forms an angle R with the other side of the glass. When R ≥ the critical angle r, the light emitted by the light source emitting device is totally reflected on the inner surface of the glass, and the light The reflected light is received by the light source receiving device; by judging the power of the received light, etc., it is determined that the defogging work is not started at this time.

As shown in Figure 4, when the inner surface of the glass is fogged, the glass is covered with water droplets 8. At this time, the angle r ₀ >R≥r between the light and the inner surface of the glass, the light is refracted on the inner surface of the glass and cannot be fully Therefore, the light source receiving device cannot receive the light emitted by the light source emitting device; by judging the power of the received light, etc., it is determined to start the defogging work at this time to remove the water droplets on the glass surface 8. After the water droplets on the glass surface are removed , the light source receiving device can receive the light again, and the defogging device stops working at this time.

As shown in Figure 5, when there are fog droplets on the inner surface of the glass, partial refraction and partial total reflection may occur. At this time, the light received by the light source receiving device, but the light intensity is weakened, so it can also be concluded that the windshield is damaged. The inner surface is fogged, and the defogging device is turned on to remove the fog.

The fogging of the windshield generally spreads from the corner to the inner side. Therefore, the boss is arranged at the corner position of the outer surface of the glass, and the light source emitting device and the light source receiving device are arranged.

The above-mentioned glass body is provided with a boss, but it is not limited to the shape of the glass in FIG. 2 . As shown in FIG. 6 and FIG. 7 , as long as a boss has a shape in a certain area, it can be called a boss. The setting of the reflected light receiving area 3 is not limited to the way of setting the second slope, as long as the reflected light can reach the light source receiving device 7 through the outer surface of the glass body. The outer surface of the body is in contact with the medium, so that the total reflection of the light passing through the inner surface does not occur at the outer surface; for another example, the second inclined surface is changed to a spherical surface.

The specific embodiments to which the present invention relates are given above, but the present invention is not limited to the described embodiments. Under the idea given by the present invention, the technical means in the above-mentioned embodiments are transformed, replaced and modified in a manner that is easy for those skilled in the art to imagine, and the functions played are basically the same as those of the corresponding technical means in the present invention. The purpose of the invention is basically the same. The technical solution formed in this way is formed by fine-tuning the above embodiment, and this technical solution still falls within the protection scope of the present invention.

Claims (9)

1. A glass for fogging identification, comprising a glass body, characterized in that a convex first slope is provided on the outer surface of the glass body, and the first slope is used to connect a light source emitting device so that incident light travels along the first slope. An inclined plane is perpendicularly incident on the inner surface of the glass body, and the outer surface of the glass body is further provided with a reflected light receiving area, and the reflected light receiving area is used to connect a light source receiving device to receive light generated through the inner surface of the glass body. Totally reflected reflected light. 2 . The glass for fogging identification according to claim 1 , wherein the reflected light receiving area is a second inclined plane, and the reflected light that is totally reflected on the inner surface of the glass body vertically passes through the first inclined plane. 3 . The two inclined surfaces enter into the light source receiving device connected on the second inclined surface. 3 . The glass for fogging identification according to claim 1 or 2 , wherein the inclination angle R of the first slope is determined according to the refractive index of air, the refractive index of water and the refractive index of glass. 4 . 4 . The glass for fogging identification according to claim 3 , wherein r≦R<r ₀ , wherein r is the critical angle of total reflection between glass and air, and r ₀ is the critical angle of total reflection between glass and water. 5 . horn. 5. A fogging detection device, comprising a light source emitting device, a light source receiving device and a glass, the glass comprising a glass body, characterized in that a convex first slope is provided on the outer surface of the glass body, and the outer surface of the glass body is A reflective light receiving area is also provided; the light source emitting device is arranged on the outer surface of the first inclined plane, and is used to vertically incident the incident light on the inner surface of the glass body, and the light source receiving device is arranged on the reflected light The receiving area is used for receiving the reflected light which is totally reflected by the inner surface of the glass body. 6 . The fogging detection device according to claim 5 , wherein the reflected light receiving area is a second inclined plane, and the reflected light that is totally reflected on the inner surface of the glass body enters vertically through the second inclined plane. 7 . the light source receiving device connected on the second slope. 7. The fogging detection device according to claim 5 or 6, wherein the light source emitting device and the light source receiving device are horizontally spaced by a set distance, and the set distance is based on the first slope angle and the The thickness of the glass body is determined. 8 . The fogging detection device according to claim 7 , wherein the inclination angle R of the first inclined plane is determined according to the refractive index of air, the refractive index of water and the refractive index of glass. 9 . 9 . The fogging detection device according to claim 8 , wherein r≦R<r ₀ , wherein r is the critical angle of total reflection between glass and air, and r ₀ is the critical angle of total reflection between glass and water. 10 .