KR102575434B1 - Raindrop detection sensor based on electrode and image fusion - Google Patents

Abstract

The electrode and image fusion-based raindrop detection sensor according to the present invention includes a first electrode plate having a primary contact area with water droplets and spaced apart from the lower end of the first electrode plate by a predetermined interval, and falling from the first electrode plate. an electrode sensor unit generating an open/short-based switching signal by a water droplet falling between the first and second electrode plates, including a second electrode plate in which a water droplet makes secondary contact; an image sensor unit generating an image by photographing the surface of the first electrode plate; An electrode precipitation database storing precipitation information according to the number of occurrences of the switching signal and the time of the short state, an image precipitation database storing a plurality of reference images according to the distribution of precipitation, and comparing the switching signal and the electrode precipitation database. In addition, it is characterized in that it includes; a control unit including a precipitation calculation unit for calculating the amount of precipitation by comparing the image with the reference image.

Description

Raindrop detection sensor based on electrode and image fusion

The present invention relates to a raindrop detection sensor based on electrode and image fusion. More specifically, an open/short-based switching signal is generated according to the state of a droplet falling, and an image of the droplet is measured to determine whether or not precipitation occurs. It is about a new and advanced raindrop detection sensor that enables more accurate measurement of precipitation.

The rain sensor is a type of rain sensor, also called a rain sensor or rain sensor, and if the driver takes a separate movement to adjust the movement or speed of the wiper while driving, an accident that can occur by looking away or making an unnecessary movement Or, it was developed to reduce driving discomfort.

This rain sensor is installed on the front shield (windshield) to provide a basis for automatically operating the wiper in case of precipitation, and at the same time, it is used in various industries such as traffic guidance platforms, variable speed limiters, salt spray devices, and snow removal equipment. being used in the field.

An example of such a rain sensor may be an optical rain sensor. The optical rain sensor generally includes a light source, and uses the fact that the light emitted from the light source is reflected differently depending on the moisture layer formed on the surface of the windshield. to detect whether a moisture layer is formed on the windshield.

Furthermore, it is common that the driving of the wiper is controlled according to whether the moisture layer is detected by the rain sensor, and the speed of the wiper is also configured to be adjusted according to the degree of the moisture layer.

As a prior art for another rain sensor, Korean Patent Publication No. 10-2021-0015194 discloses <a vehicle rain sensor, a wiper system using the same, and a wiper control method>.

The prior art is a substrate, a first sensor disposed on a first surface of the substrate to detect a sound signal, a second sensor disposed on a second surface of the substrate and bonded to a vehicle windshield to detect capacitance change, and It relates to a rain sensor including a processor for determining precipitation based on at least one of the acoustic signal and the capacitance change, and by applying a capacitive sensor patterned in various shapes to improve detection ability, even drizzle level raindrops It is characterized by being able to detect.

This prior art rain sensor uses the principle of reflecting the permittivity of water droplets collected in the space between the first and second electrodes to the capacitance value measured in the capacitor. When foreign matter such as dust, bird droppings, salt or oil remains, it is often mistaken to recognize it as a precipitation situation by recognizing it as water droplets.

Therefore, in order to solve the above-mentioned problems, there is a need to develop a novel and advanced raindrop detection sensor that can more accurately identify precipitation by increasing the recognition accuracy of waterdrops and further measure the amount of precipitation.

Korean Patent Publication No. 10-2021-0015194

The present invention was made to overcome the problems of the above technology, and an open/short-based switching signal is generated with water droplets falling between the first and second electrode plates to determine whether or not precipitation as well as the amount of precipitation is obtained. The main purpose is to provide a raindrop detection sensor with increased precipitation measurement accuracy.

Another object of the present invention is to determine the type of snow that is precipitated based on an image.

Another object of the present invention is to prevent snow from accumulating on the electrode sensor unit.

A further object of the present invention is to make it possible to control the temperature of the heater, thereby enhancing the water droplet retention prevention function.

In order to achieve the above object, the electrode and image fusion-based raindrop detection sensor according to the present invention has a first electrode plate having a primary contact area with water droplets and spaced apart from the lower end of the first electrode plate at a predetermined interval. an electrode sensor unit generating an open/short-based switching signal by a water droplet falling between the first and second electrode plates, including a second electrode plate in which water droplets falling from the first electrode plate make secondary contact; an image sensor unit generating an image by photographing the surface of the first electrode plate; An electrode precipitation database storing precipitation information according to the number of occurrences of the switching signal and the time of the short state, an image precipitation database storing a plurality of reference images according to the distribution of precipitation, and comparing the switching signal and the electrode precipitation database. In addition, it is characterized in that it includes; a control unit including a precipitation calculation unit for calculating the amount of precipitation by comparing the image with the reference image.

In addition, a heater having a heating wire is mounted on the first and second electrode plates, and the control unit performs heating including a shape of a water droplet changed according to the height of the surface temperature of the first electrode plate heated by the heater. It includes a heating image database storing images, and the precipitation calculation unit includes a function of simultaneously comparing the image with the reference image and the heating image.

Furthermore, the first and second electrode plates each include a thermometer, and the control unit measures at least one of the first and second electrode plates according to a temperature difference between the first and second electrode plates measured by the thermometer. It is characterized in that it includes a heater control unit for controlling the heating temperature of the heater.

According to the electrode and image fusion-based raindrop detection sensor of the present invention,

1) It is basic to take an electrode sensor structure that can measure the amount of precipitation according to the number of occurrences of switching signals and the time of short state. It is possible to measure the amount of precipitation more accurately by adding a configuration that can measure the amount of precipitation once more based on the

2) Notification can be provided inside the vehicle by detecting the type of snow that is precipitating through sub-video analysis, and in particular, warning notifications are additionally provided when snow that does not melt well is detected to notify vehicle slippage and anticipate traffic congestion. notifications, etc.

3) The accumulation of snow can be prevented and the residual phenomenon of water droplets can be prevented once more through the heaters of the first and second electrode plates provided in the raindrop detection sensor,

4) Through the heating temperature control configuration of the first and second electrode plates, it is possible to prevent the heating performance of any one of the first and second electrode plates from deteriorating or the occurrence of overheating of a specific electrode plate, so that even heating can be achieved. It can of course prevent failures due to overheating.

1 is a conceptual diagram showing a raindrop detection sensor according to the present invention;
Figure 2 is an enlarged cross-sectional view of the electrode sensor unit of the present invention.
Figure 3 is a block diagram showing the detailed configuration of the control unit of the present invention.
4 is a cross-sectional view showing the bending structure of the first electrode plate of the present invention.
5 is a conceptual diagram including an image sensor unit including a sub-camera according to the present invention;
6 is a conceptual diagram showing an electrode plate equipped with a heater of the present invention.
7 is a cross-sectional view showing a structure in which tension reducing layers are coated on first and second electrode plates of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are not drawn to scale, and like reference numbers in each drawing indicate like elements.

1 is a conceptual diagram showing a raindrop detection sensor of the present invention, FIG. 2 is an enlarged cross-sectional view of the electrode sensor unit of the present invention, and FIG. 3 is a block diagram showing the detailed configuration of the control unit 300 of the present invention.

Referring to FIGS. 1 to 3 , the raindrop detection sensor based on electrode and image fusion of the present invention is characterized by including an electrode sensor unit 100, an image sensor unit 200, and a control unit.

The electrode sensor unit 100 includes first and second electrode plates 110 and 120 based on the principle of collecting and then falling water droplets.

The first electrode plate 110 is formed on the upper part of the first and second electrode plates 110 and 120, and is based on a structure having a physical volume capable of collecting water droplets (for example, a plate-like body with an upper surface having a certain area). A predetermined space is generated between the second electrode plate 120 and the second electrode plate 120 at a predetermined interval.

Here, more preferably, the first electrode plate 110 of the present invention may have a downwardly inclined structure, so that water droplets do not accumulate or remain on the first electrode plate 110 for a long time.

In many cases, the known two electrode plates mainly pursue a method of reflecting the permittivity of water droplets to the capacitance value measured in the capacitor, and the two electrode plates are often made of a mutually parallel structure. Since the continuous/discontinuous state of water droplets falling between the second electrode plates 110 and 120 is recognized as an open/short signal, in particular, the first electrode plate 110 naturally causes the water droplets to fall to the second electrode plate 120. It is important.

At this time, if the first electrode plate 110 is parallel to the second electrode plate 120, the water droplets may not fall smoothly or remain unnecessarily on the first electrode plate 110, so that the amount of precipitation may not be accurately measured. The first electrode plate 110 of the present invention may be disposed in a structure inclined downward toward the second electrode plate 120 which is mainly placed in parallel with the bottom surface.

The inclination angle of the first electrode plate 110 and the second electrode plate 120 can be variously processed according to the arrangement environment of the first and second electrode plates 110 and 120, and the first electrode plate 110 It is based on a structure that extends in a straight line, but may be bent in a downward rounding shape or, as will be described later, a bent structure.

In addition, although the drawing shows that the first electrode plate 110 is made of a plate-like body, it is not necessarily limited thereto, and is formed to have a closed curved surface in a funnel shape, that is, an inverted cone shape, to further reduce water droplets such as snow and rain. You can also collect efficiently. Of course, the funnel-shaped first electrode plate 110 also has a specific inclination angle with the second electrode plate.

The first electrode plate 110 contacts the water drop first among the first and second electrode plates 110 and 120, which is referred to as 'primary contact' in the present invention.

The second electrode plate 120 is disposed at a point (eg, the bottom surface) spaced apart from the lower end of the first electrode plate 110 by a predetermined distance, and like the first electrode plate 110, the second electrode plate 120 has a certain area on the upper surface. It consists of a structure (plate-like body) that can have.

At this time, the second electrode plate 120 does not necessarily have a horizontal structure to coincide with the horizontal floor surface and may have a certain angle with the floor surface depending on the arrangement situation, but the important point is that it is different from the first electrode plate 110. According to the above-described principle, only a specific inclination angle is required.

The second electrode plate 120 is contacted by water droplets falling from the first electrode plate 110. Since the water droplets contact the second electrode plate 120 after contacting the first electrode plate 110, in the present invention, The contact of water droplets to the second electrode plate 120 is referred to as 'secondary contact'.

The first and second electrode plates 110 and 120 provide a function of generating a switching signal when a water droplet falls through the medium of a conductive property inherent in the water droplet.

Specifically, water droplets have a property of falling from the first electrode plate 110 to the second electrode plate 120 by gravity, and at this time, when the water droplets connect between the first and second electrode plates 110 and 120, the first and second electrode plates 110 and 120 are connected. When the electrode plates 110 and 120 are in a short state and water droplets are broken between the first and second electrode plates 110 and 120, the first and second electrode plates 110 and 120 can be recognized as an open state.

That is, the first and second electrode plates 110 and 120 provide a function of generating an open/short-based switching signal by water droplets falling between them. At this time, the switching signal can be generated to determine the number of occurrences based on unit time (1 second, 10 seconds, 30 seconds, 1 minute, etc.).

The image sensor unit 200 performs a function of generating an image by photographing the surface of the first electrode plate 110, and this image sensor unit 200 may be a conventional photosensor, that is, a camera. The image sensor unit 200 may be provided on one side of the periphery of the first electrode plate 110, and as long as the surface of the first electrode plate 110 can be photographed, there is no limitation on its location, shape, or size. .

In particular, the reason why the image sensor unit 200 photographs the surface of the first electrode plate 110 is that the surface of the first electrode plate 110 is the first contact with snow/rain, that is, the first contact. In other words, it is because the surface of the first electrode plate among the electrode sensor units 200 is the easiest part to grasp the original snow/rain state right before the snow melts or the rainwater becomes cloudy.

In addition, since a separate light may be provided on one side of the periphery of the first electrode plate 110, illumination light is radiated to the first and second electrode plates 110 and 120 through the medium of the light, so that the first electrode through the image sensor unit 220 It is possible to increase the sharpness of the image obtained by photographing the surface of the plate 110, and through this, it is possible to increase the accuracy of determining the amount of precipitation as well as distinguishing snow, rain, foreign matter, etc. in a configuration to be described later.

The control unit 300 controls the on/off of the electrode sensor unit 100 and the image sensor unit 200 of the present invention and simultaneously analyzes the switching signal and image to calculate the amount of precipitation. To this end, the electrode It includes a precipitation database 310 , an image precipitation database 320 , and a precipitation calculation unit 330 .

The electrode precipitation database 310 is a database storing various precipitation information classified according to the number of occurrences of switching signals generated by the first and second electrode plates 110 and 120 and the time of the short state.

The electrode precipitation database 310 is based on the structure of the first and second electrode plates 110 and 120 (based on the distance between the first and second electrode plates 110 and 120, the surface area, etc.) and the surrounding environment (the first and second electrode plates 110 and 120). It serves as a look-up table that measures and stores the amount of precipitation measured during precipitation based on ambient temperature, humidity, etc.).

For example, the number of occurrences of switching signals (1 time, 2 times, etc.) based on unit time (1 second, 10 seconds, 1 minute, etc.) The number of occurrences of a switching signal generated in a specific amount of precipitation by measuring the duration of the short state (3 seconds, 5 seconds, 10 seconds, etc.) (furthermore, the period of the short state) can be referred to as data stored and processed.

For example, in the case of a small amount of snow/rain, the number of occurrences of the open/short-based switching signal is low and the time of the short state is short. Save.

In addition, in the case of heavy rain or heavy snow, the number of occurrences of open/short-based switching signals is high and the duration of the short state is long. The electrode precipitation database 310 stores the number of occurrences of switching signals and the time of the short state at this time. do.

Through this electrode precipitation database 310, the number of occurrences of the switching signal generated between the first and second electrode plates 110 and 120 and the time of the short state are conveniently measured (at least classified according to specific quantities). In this state, it is possible to establish a basis for determining whether the amount of precipitation is high or low based on the relevant criteria.

The image precipitation database 320 is a database storing a plurality of reference images according to the distribution of precipitation.

The image precipitation database 320 includes an image capable of distinguishing between snow and rain, for example, an image in which the shape of snow/rain falling on the first electrode plate is stored in various ways according to time zone and wind speed conditions, or provides an overview of precipitation. Images that can be identified, for example, images of precipitation occurring on the first electrode plate for each amount of precipitation, such as 1 mm, 2 mm, 5 mm, 10 mm, 30 mm, 50 mm, and 100 mm of precipitation, may be stored as reference images.

For example, an image of the first electrode plate 110 photographed in a situation where water drops fall on the first electrode plate 110 with a precipitation of 1 mm, and a first electrode in a situation where water drops fall on the first electrode plate 110 with a precipitation of 3 mm Like the image taken of the plate 110, the image taken of the first electrode plate 110 in a situation where snow or rain falls on the first electrode plate 110 for each amount of precipitation becomes a reference image, and the first electrode plate 110 for each amount of precipitation An image of the first electrode plate in a situation where it is snowing or raining on the plate 110 becomes a reference image, and thus data storing the reference image for each amount of precipitation may become the image precipitation database 320 .

Through the image precipitation database 320 as a medium, the image captured by the image sensor unit 200 through the reference image for each amount of precipitation is used as a medium to more easily distinguish snow and rain falling on the first electrode plate 110 In addition, it is possible to have a basis for more accurate calculation of precipitation for water droplets including snow or rain by assisting the base of the electrode sensor unit 100.

The precipitation calculation unit 330 compares the switching signal generated by the first and second electrode plates 110 and 120 included in the electrode sensor unit 100 with the electrode precipitation database 310, and the image sensor unit 200 The function of calculating the amount of precipitation is performed by comparing the generated image with the reference image stored in the image precipitation database 320.

Here, first, the configuration for comparing the switching signal and the electrode precipitation database 310 is described. According to the above-mentioned principle, the switching signal is substituted into the electrode precipitation database 310 classified according to the number of occurrences based on unit time of the switching signal. After selecting a specific electrode precipitation database 310 at a specific number of occurrences, the precipitation value of the selected electrode precipitation database 310 is read and processed to perform a role of primarily calculating precipitation.

Furthermore, referring to the configuration for comparing the image generated by the image sensor unit 200 with the reference image stored in the image precipitation database 320, as mentioned above, a first As much as the reference image of water drops falling on the electrode plate 110 is stored, the image generated through the image sensor unit 200 and the reference image stored in the image precipitation database 320 are compared and processed, and the image sensor unit 200 After extracting a reference image that has the most similar level of precipitation to the generated image or can read snow and rain, snow or rain is read through the extracted reference image, and metadata recorded separately in the reference image By grasping the precipitation value, the secondary determination can be made as the precipitation of the corresponding image.

Therefore, firstly, the amount of precipitation is calculated by comparing the switching signal with the electrode precipitation database 310, and secondarily, the image generated through the image sensor unit 200 is compared with the reference image stored in the image precipitation database 320. By calculating (correcting) the amount of precipitation by doing so, the amount of precipitation is calculated twice in total.

For example, after setting the weight of the precipitation value of the electrode sensor unit 100 and the precipitation value of the image sensor unit 200 to 3:1, and then giving a difference in weight by a basic multiple regression analysis formula, the final amount of precipitation is obtained, or In a situation where the accuracy of the reference image is set to a fairly reliable level, the average of the first and second calculated precipitation values can be obtained to finally calculate the amount of precipitation.

In summary, the raindrop detection sensor of the present invention has a characteristic of providing a function of more accurately calculating precipitation as well as a function of more accurately distinguishing between snow and rain by fusing an electrode sensor and an image sensor.

Furthermore, the precipitation calculation unit 330 may provide an alarm display function as well as providing a function of calculating an accurate precipitation value.

For example, the precipitation calculation unit 330 may provide an alarm display such as yellow when a small amount of snow/rain falls and red when heavy rain or heavy snow falls.

In summary, the raindrop detection sensor of the present invention generates an open/short-based switching signal according to the falling state of water droplets, and then takes an electrode sensor structure that can measure the amount of precipitation according to the number of occurrences of the switching signal and the duration of the short state. Basically, by taking a picture of the surface of the electrode sensor unit 100, especially the first electrode plate 110, and comparing it with a reference image, the precipitation can be measured once more based on the image, enabling comprehensive precipitation calculation. By doing so, it provides a feature that can measure precipitation more accurately.

4 is a cross-sectional view showing the bending structure of the first electrode plate of the present invention.

Referring to FIG. 4 , the first electrode plate 110 of the present invention may have a bent and extended structure. Preferably, the first electrode plate 110 includes the first extension part 111 and the first extension. It may be configured to include a second extension portion 112 bent and extended from the portion 111 .

Here, the second extension part 112 is bent and extended from the end of the first extension part 111 extending toward the second electrode plate 120, and in the above description, the first electrode plate 110 is preferably lowered. The first electrode plate 110 of the present invention is inclined downward toward the second electrode plate 120, which is mainly parallel to the floor, so that water droplets fall smoothly from the first electrode plate 110 due to its inclined structure. are placed in the structure.

At this time, preferably, both of the first and second extension parts 111 and 112 may be bent and extended downwardly, but the second extension part 112 is bent and extended with a larger angle of inclination than the first extension part 111, so that water droplets smoothly flow. fall can be made possible.

For example, the first extension 111 may be bent and extended with the second extension 112 obliquely downward in a state where the first extension 111 is extended horizontally, or both the first and second extensions 111 and 112 may be extended obliquely downward. The second extension 112 may be bent and extended from the first extension 111 so that the inclination angle of the second extension 112 is greater than the inclination angle of the first extension 111 .

Therefore, through the first electrode plate 110 having such a bent and extended structure, it is possible to prevent water droplets from pooling or remaining on the first electrode plate 110 for a long time, thereby preventing water droplets from falling through unnecessarily remaining water droplets. Even though it is not, it is possible to prevent the short state from being detected, and through this, it is possible to solve the problem that water droplets do not fall smoothly or remain unnecessarily, so that the amount of precipitation cannot be accurately measured.

In addition, the image sensor unit 200 can generate first and second images by photographing the surfaces of the first and second extension portions 111 and 112 of the first electrode plate 110 , respectively.

To this end, the image sensor unit 200 may include first and second cameras 210 and 220 so that the first camera 210 photographs the surface of the first extension 111 to generate a first image, and the second The camera 220 may capture the surface of the second extension part 112 to generate the second image, or one image sensor unit 200 may sequentially photograph the first and second extension parts 111 and 112. It is also possible. However, preferably, the image sensor unit 200 includes the first and second cameras so that the first and second cameras 210 and 220 take pictures of the first and second extension parts 111 and 112, respectively, to generate the first and second images. there is.

Therefore, by photographing the surface of each of the first and second extension portions 111 and 112 having different inclination angles, it is possible to prepare a basis for increasing the accuracy of precipitation calculation through the precipitation calculation unit 330 to be described later.

When the first and second images are generated as described above, the precipitation calculation unit 330 compares the switching signal with the electrode precipitation amount database 310 and compares the first and second images with the reference image to calculate the amount of precipitation. possible.

Here, a configuration for first calculating precipitation by comparing the switching signal with the electrode precipitation amount database 310 can be grasped by referring to the above description, so a detailed description thereof will be omitted.

Furthermore, in calculating the amount of precipitation by comparing the first and second images and the reference image, the first image obtained by capturing the first extension 111 and the second image obtained by capturing the second extension 112 and the standard By comparing the images, the amount of precipitation based on the first image is separately calculated, and the amount of precipitation based on the second image is separately calculated.

If it is difficult to measure precipitation because water droplets are aggregated or remain in a specific part of the first and second extension parts 111 and 112, for example, even if the precipitation is not calculated based on the first image, the second image It can also be said to prepare an alternative system so that the amount of precipitation can be calculated as a standard.

In addition, when precipitation occurs in a specific direction due to strong wind, etc., the amount of precipitation of the first image standard and the amount of precipitation of the second image standard may be different. In the configuration of secondary measurement of precipitation by comparing images, it is possible to increase the precision of precipitation measurement through images by comparing each of the first and second images with the reference image to obtain an average value of precipitation.

Therefore, the average value is obtained after comparing the first and second images with the reference image, or, if the precipitation cannot be measured in a specific image, the precipitation is calculated by comparing another image with the reference image. After the secondary calculation is completed, the precipitation can be finally calculated by comparing it with the primary calculated precipitation and obtaining an average value.

In summary, as described above, according to the bending configuration of the first electrode plate 110 and the generation of the first and second images for the bent first and second extension portions 111 and 112 and the configuration of measuring precipitation based on the first and second images. , Even if it is impossible to accurately measure precipitation due to water droplets such as snow or rain gathering or remaining in a specific part of the first electrode plate 110, it is possible to substitute it through another part, and furthermore, even if precipitation is made in a specific direction by wind , it is possible to calculate the amount of precipitation more accurately and precisely by calculating the amount of precipitation at different inclination angles and averaging them to obtain the amount of precipitation.

In the first electrode plate 110 that may have a structure bent as described above, the possibility of snow or rain accumulating on the first extension portion 111 is higher than that of the second extension portion 112 having a preferably greater inclination angle. . In particular, since this feature is prominent in the case of snow that is easy to accumulate compared to rain, it can be said that the probability of snow accumulation is higher in the first extension 111 having a relatively low inclination angle than in the second extension 112.

Therefore, in order to increase the accuracy of measuring precipitation according to the type of snow in the first extension part 111 where snow easily accumulates, the controller 300 of the present invention may first include a snow image database 340. .

The snow image database 340 is a database storing snow images classified according to snow, sleet, drizzle, heavy snow, and hail.

The snow image database 340 includes, for example, an image of snow falling on the first electrode plate 110, especially the first extension 111, an image of sleet falling on the first extension 111, and snow falling on the first extension 111. 1 It can be said that the image of falling on the extension 111, the image of heavy snow falling on the first extension 111, and the image of hail falling on the first extension 111 are stored, respectively. Data storing snow images classified according to snow, snow, snow, and hail may become the snow image database 340.

Therefore, in the snow image database 340 calculating the amount of precipitation through the precipitation calculation unit 330, the raindrop detection sensor and furthermore, the type of snow that can easily accumulate in the place where the raindrop detection sensor is installed is discriminated, and the amount of precipitation according to the type of snow is determined. It can be said to provide a framework for correcting the snow, and furthermore, it provides a basis for providing additional functions such as controlling the vehicle's wiper driving speed according to the type of snow.

Such a snow image database 340 is a basis for easily determining what kind of snow is accumulated on the first electrode plate 110, especially the first extension 111, where snow is relatively easy to accumulate due to its low inclination. provides

In addition, the snow image database 340 may compare images in which snow, rain, etc. are changed into liquid, and store images in which poorly melted snow, hail, etc. are melted and changed into water droplets. Therefore, it is possible to establish a basis for additionally providing functions such as vehicle slip notification and traffic congestion forecast notification by detecting snow and hail that do not melt well and providing additional warning notification.

In addition, when an image in which snow or rain is changed to liquid is stored in the snow image database 340, the possibility of mistaking sand or foreign matter falling on the first electrode plate 110 as snow or rain is minimized. can do. In the case of foreign matter or sand, the shape does not change by melting on the surface of the first electrode plate 110, but in the case of snow or rain, which will be described later, the heater 130 that can be provided on the first electrode plate 110 or the natural surface This is because it can change its shape into water droplets while melting on the surface by melting.

Therefore, for snow or rain that can be melted in the first electrode plate 110 and changed in shape to water droplets, an image in which the corresponding snow melts into water droplets is displayed on the snow image database 340 in addition to snow images for each type of snow. When stored together, it is possible to minimize detection errors that may occur as foreign substances, insects, or sand are detected as snow or rain.

Furthermore, when the snow image database 340 is included in this way, the precipitation calculation unit 330 may compare the first image with the reference image and simultaneously compare it with the snow image. Here, the amount of precipitation can be determined based on the first image by comparing the first image with the reference image, and the type of snow detected in the first image can be determined by comparing the first image with the snow image.

In this case, in a vehicle or the like in which the corresponding raindrop detection sensor is installed, it is possible to determine the type of snow falling according to weather changes, so that a separate warning notification may be provided.

If the first image and the snow image are compared, notifications are made from inside the vehicle depending on the type of snow that easily accumulates and does not fall but melts easily (wet snow: example thick snow) or snow that is soft, light, and easily falls but does not melt easily (construction: example snowy snow) In particular, it is also possible to additionally provide functions such as vehicle slip notification and traffic congestion prediction notification by additionally providing a warning notification as snow that does not melt well is detected.

In addition, through comparison processing between the snow image and the first image, the error of mistaking a foreign substance or sand for snow or rain and determining it as precipitation, or the error of detecting sand or foreign substance as snow or hail is minimized to improve the snow or rain detection function. At the same time as strengthening, it is also possible to increase the discrimination accuracy for the type of snow or rain.

5 is a conceptual diagram including an image sensor unit including a sub-camera according to the present invention.

Referring to FIG. 5 , the image sensor unit 200 described above may further include a sub camera 230 that captures an area around the first electrode plate 110 and generates a sub image.

Here, the sub camera 230 is provided near a photosensor or camera, which is a basic component of the image sensor unit 200, and captures an area around the first electrode plate 110 to generate a sub image. may further capture the surrounding area of the first electrode plate 110, that is, the surrounding environment in which the first electrode plate 110 is installed.

Furthermore, when the sub camera 230 is further provided as described above, the above-described control unit 300 further includes the image correction unit 350 to determine the presence and amount of foreign matter and light based on the sub image to obtain an image can be corrected.

In the above description, it has been said that the sub image can further capture the surrounding area of the first electrode plate 110, that is, the surrounding environment in which the first electrode plate 110 is installed. Therefore, when the air in the vicinity where the first electrode plate 110 is installed is photographed through the sub-image, foreign substances in the air, such as soil dust or sand, may be photographed, and furthermore, light generated from other vehicles or light sources such as the sun or other lights may be captured. may be filmed.

Therefore, it is possible to remove the foreign matter included in the image by recognizing such foreign matter or light and correcting the image in such a way that, when the foreign matter is detected, the foreign matter is regarded as noise and the noise is removed, and as described above, when light is detected By correcting the image by lowering the brightness of the image, it is possible to prevent raindrops from not being detected due to too high brightness.

Here, in the case of light detection, existence can be identified by determining whether a specific part of the sub-image is being highlighted, and the amount of light can also be determined by determining the degree of highlighting.

In the case of foreign matter detection, after storing a standard image for a state in which there is no foreign matter, the standard image and the sub image may be compared and processed to detect foreign matter, or the area around the first electrode plate 110 and the gray pattern may be simultaneously photographed Thus, it is also possible to detect whether or not there is a foreign substance and its amount by analyzing the degree of penetration of the gray pattern or the histogram for each brightness.

Therefore, through the configuration of identifying the existence and amount of foreign matter and light and correcting the image based on this, recognition errors that may occur due to foreign matter, backlight, etc. in image-based precipitation measurement can be minimized and the accuracy of precipitation measurement can be increased. is of course

6 is a conceptual diagram showing an electrode plate equipped with a heater of the present invention.

Referring to FIG. 6 , a heater 130 having a heating wire may be mounted on the first and second electrode plates 110 and 120 described above.

At this time, the heater 130 is formed in the form of a hot wire extending in a zigzag pattern at a certain distance, and the surfaces of the first and second electrode plates 110 and 120, more precisely, around the area where the first and second electrode plates 110 and 120 face each other. It can be installed on the surface of (the main surface of the facing area or sensing area).

The heater 130 provides a function of accurately generating an open/short-based switching signal in the first and second electrode plates 110 and 120, that is, the first and second electrode plates 110 and 120 do not needlessly remain. It plays a role of minimizing a problem that interferes with the generation of a switching signal by a subsequent water droplet due to a water droplet.

In addition, as the first and second electrode plates 110 and 120 are heated through the heater 130, they play a role in melting snow or ice accumulated on the surface of the first and second electrode plates 110 and 120 or frozen, and furthermore, due to this This can prevent the accuracy of the switching signal from deteriorating.

That is, if water droplets remain in the area where the first and second electrode plates 110 and 120 come into contact with the water droplets, the water droplets combine with subsequent water droplets to unnecessarily increase the number of drops, or the water droplets aggregate due to the surface tension inherent in water and form the water droplets properly. There is a problem in that it is difficult to generate an accurate switching signal because it cannot fall.

In addition, if a so-called dew condensation phenomenon occurs due to an external temperature difference when water droplets remain on the surfaces of the first and second electrode plates, this may cause unnecessary errors when measuring precipitation.

The heater 130 of the present invention evaporates water droplets in order to solve this problem. When the first and second electrode plates 110 and 120 are installed in the sensing area facing each other, even the water droplets to be measured can be evaporated. It is possible to quickly remove water droplets that may interfere with generating an accurate switching signal, such as being installed around and causing dew condensation.

Such a heater may also be installed only on the first electrode plate 110, because in particular, if water droplets remain on the first electrode plate 110, the drop of the water droplets may be significantly affected.

In addition, when the heater 130 is installed on both the first and second electrode plates 110 and 120, the heater 130 of the first electrode plate 110 performs a function of melting snow when it snows in real time, and the second electrode The heater 130 of the plate 120 may be specialized in a function of evaporating water droplets remaining on the surface. At this time, since their functions are different from each other, the first and second electrode plates 110 and 120 may be alternately driven with a time difference or Various driving control is possible by setting and driving the temperature to have a temperature difference.

In addition, when the heater 130 is provided, snow or ice accumulated on the first and second electrode plates 110 and 120 can be melted, melting the snow in real time so that snow or ice is formed on the surfaces of the first and second electrode plates 110 and 120. It is possible to prevent accumulation and increase the accuracy of switching signal generation through the drop of water droplets.

Furthermore, when the heater 130 is provided in this way, a part of the water droplets falling on the heated electrode sensor unit 100 vaporizes or melts the frozen water droplets, causing a change in shape. The control unit 300 of the present invention may further include a heating image database 360.

The heating image database 360 is a database that stores heating images including shapes of water droplets that are changed according to the level of the surface temperature of the first electrode plate 110 heated by the heater 130 . As the first electrode plate 110 is heated, rain among water droplets may be partially vaporized and the diameter may be reduced. In particular, snow may be heated and melted on the surface of the first electrode plate 110 to become water and change shape. change greatly

That is, the shape change of snow may be larger than that of rain by the heater 130. As the snow having a crystal structure melts and the volume decreases and the size decreases, the shape of the crystal is lost, and as the volume decreases, the water droplets do not accumulate and flow down. The size and shape will change.

Therefore, since the degree of melting of snow, the degree of melting of snow, the degree of vaporization of melted water, and the degree of flowing down may vary depending on the high and low of the surface temperature, the heating image including the shape of water droplets that change differently for each surface temperature are stored respectively. That is, heating images may be separately stored for each surface temperature, such as a surface temperature of 8°C, a surface temperature of 10°C, and a surface temperature of 20°C.

The heating image database 360 determines whether or not snow melts according to the surface temperature of the first electrode plate 110, and further determines the difference according to the surface temperature, such as the size change of water droplets according to the surface temperature. can provide.

Furthermore, when the heating image is stored through the heating image database 360 in this way, the precipitation calculation unit 330 can simultaneously compare the image obtained by photographing the surface of the first electrode plate 110 with the heating image as well as the reference image. .

Therefore, it is possible to determine the amount of precipitation through comparison of the image and the reference image, and furthermore, through comparison processing between the image and the heating image, it is determined whether or not the snow that has fallen on the first electrode plate 110 melts, and if the snow does not melt, the heater ( 130) may be increased, and furthermore, when the snow melts sufficiently and changes in shape to water droplets, the speed of the wiper provided in the vehicle may be increased to enable interlocking with other devices provided in the vehicle.

Therefore, through this configuration, it is possible to prevent snow from accumulating through the heater 130 of the first and second electrode plates 110 and 120 provided in the raindrop detection sensor, and furthermore, the accumulated snow is melted and shed through the heater 130 At the same time, it is possible to automatically detect whether or not the snow has melted to provide an interlocking function, thereby increasing user convenience.

Furthermore, thermometers may be provided on the first and second electrode plates 110 and 120, respectively. Such a thermometer is used to measure the surface temperature of the first and second electrode plates 110 and 120. It may be provided on one side.

In addition, when a thermometer is provided, the surface temperature of the first and second electrode plates 110 and 120 can be measured. Here, the controller 300 includes the heater controller 370 to measure the first and second electrode plates ( The heating temperature of the heater 130 provided on at least one of the first and second electrode plates 110 and 120 may be controlled according to the temperature difference between the first and second electrode plates 110 and 120 .

At this time, the meaning of controlling the heating temperature means that, for example, when the temperature of the first electrode plate 110 among the first and second electrode plates 110 and 120 is too low, the temperature of the first and second electrode plates 110 and 120 is controlled to match. The first example may be to increase the temperature of the first electrode plate 110 so that sufficient heating can be achieved, or the temperature of the first electrode plate 110 among the first and second electrode plates 110 and 120 is too high. In this case, the heating temperature is controlled by lowering the temperature of the first electrode plate 110 so that the temperatures of the first and second electrode plates 110 and 120 match, so that overheating of a specific electrode plate can be prevented.

Therefore, through this, it is possible to prevent the deterioration of the heating performance of any one of the first and second electrode plates 110 and 120 or the occurrence of overheating of a specific electrode plate so that even heating can be achieved, as well as failure can be prevented.

However, in general, since using the heater 130 means winter, a snow build-up problem due to performance deterioration of the heater 130 may cause greater inconvenience than failure of the electrode sensor unit 100 due to overheating.

Therefore, it is more important to increase and control the heating temperature of the heater mounted on the electrode plate having the low surface temperature so that the surface temperature of the electrode plate having the low surface temperature among the first and second electrode plates 110 and 120 matches the surface temperature of the other electrode plates. Here, the heater controller 370 may preferably raise and adjust the heating temperature of the heater mounted on the electrode plate having the low surface temperature among the first and second electrode plates 110 and 120 through Equation 1 below.

Equation 1,

(here, is the heating temperature over time, T is the initial surface temperature of the electrode plate subject to temperature control, is the surface temperature of the first electrode plate, is the surface temperature of the second electrode plate, is the continuous driving time of the heater, t is the length of time from the start of heating temperature control)

Here, the unit of the continuous driving time of the heater 130 and the length of time required from the start of the heating temperature rise must match, and here, any one of seconds/minutes can be used as the unit.

At this time, if the surface temperature of the first electrode plate 110 is 6 ° C and the surface temperature of the second electrode plate 120 is 2 ° C, the heater 130 is currently continuously operating for 3 minutes (180 seconds), the heating temperature It is assumed that the time taken from the start of the adjustment is 1 minute (60 seconds).

In this case, the second electrode plate 120 becomes the electrode plate subject to temperature control, and here, the heating temperature of the second electrode plate 120 based on 60 seconds is as follows.

That is, the heating temperature of the second electrode plate 120 at a time when 1 minute (60 seconds) is required from the start of heating temperature control may be set to 5.72°C.

Therefore, in Equation 1, the value of the heating temperature gradually increases over time from the start of heating temperature control, and finally appears to converge to the surface temperature of the other electrode plate in the system.

At this time, the heating temperature rises rapidly in the beginning, but it can be said that the temperature adjustment width can be gently adjusted in a way that gradually eliminates the surface temperature difference. Therefore, the driving force for the initial temperature rise process is provided, but the rising trend is gradually alleviated over time.

If the heating temperature is simply increased linearly, the heating temperature is raised and maintained linearly without a section in which rapid fluctuations are mitigated. This has the disadvantage that it is not natural in the process of fluctuation and adaptation of general values, so it is strongly boosted at the beginning. There is an effect of allowing the natural heating temperature to rise through the initial driving force provision and gradual relief through the boost processing through the hyperbolic tangent function in which the gradient of the upward trend is gradually alleviated in the state in which the driving force is provided.

Therefore, the heating temperature is raised and controlled so that the surface temperature of the electrode plate having the low surface temperature among the first and second electrode plates 110 and 120 matches the surface temperature of the other electrode plates, thereby increasing the temperature of the windshield of the vehicle in which the raindrop detection sensor of the present invention is installed. It is possible to prevent snow accumulation, but at this time, by maintaining the increase in heating temperature more naturally, it is possible to prevent rapid overheating and perform more natural heating and temperature maintenance.

7 is a cross-sectional view showing a structure in which tension reducing layers are coated on first and second electrode plates according to the present invention.

As described above, the raindrop detection sensor of the present invention is based on the open/short-based switching signal generation generated by the principle of dropping the waterdrops that first contacted the first electrode plate 110 to the second electrode plate 120. It is to measure whether or not there is precipitation and the amount of precipitation. Above all, water droplets naturally fall from the first electrode plate 110 to the second electrode plate 120, and water droplets do not remain on the second electrode plate 120 as much as possible. It is important.

However, water droplets (snow/rain) falling on the first electrode plate 110 do not fall to the second electrode plate 120 but aggregate due to surface tension, which is an inherent property of water, or droplets that fall to the second electrode plate 120 When it condenses with surrounding water droplets in its state, it becomes difficult to properly calculate the amount of precipitation, and this situation can be particularly highlighted when a small amount of precipitation (eg, 0.1 mm) falls intermittently.

Therefore, in order to prevent this, referring to FIG. 7 , one side of the first and second electrode plates 110 and 120 described above, preferably, the upper surface of the first electrode plate 110 and the second electrode plate 120 A tension reducing layer 140 may be coated on an upper surface under the first electrode plate 110 . Here, the tension reducing layer 140 may preferably be referred to as a coating layer coated with a material capable of reducing the surface tension of the first and second electrode plates 110 and 120, through which the first and second electrode plates 110 and 120 ) Function to weaken the surface tension on the surface to prevent water droplets from forming or remaining on the first and second electrode plates 110 and 120 and to form a small water droplet unit to easily fall or flow naturally from the second electrode plate to the surroundings provides

The tension reducing layer 140 preferably includes decyl glucoside, glycolipid, and methylglucamine as active ingredients.

More preferably, in the case of the coated tension reducing layer 140, 20 to 50 parts by weight of decyl glucoside and 10 to 50 parts by weight of glycolipid, excluding the solvent (assuming a drying situation after the coating treatment) 40 parts by weight and 10 to 40 parts by weight of methylglucamine.

Decyl glucoside is a naturally-derived surfactant, also called Conacopa (APG), and is a substance produced by a condensation reaction of glucose (glucose) obtained from corn starch and decyl alcohol obtained from vegetable oils such as coconut oil and palm oil. It does not have a harmful effect on the human body and the environment, and is easily decomposed in nature, and has excellent surface activity ability to reduce the surface tension of water droplets on the surface of the first and second electrode plates 110 and 120.

Glycolipids are lipids containing one or more carbohydrate groups covalently bound to acylglycerols, sphingolipids, or ceramides, and are surfactant substitutes derived from sugarcane. It is a substance that adds the effect of reducing the surface tension of water droplets by adding surface activity by assisting the function of decyl glucoside.

Menthyl anthranilate is an ester of menthol and o-antranilic acid, and has a function of chemically blocking ultraviolet rays, so that the tension reducing layer 140 is oxidized by sunlight and the like. do.

Therefore, according to the tension reducing layer 140, a surface tension reducing effect based on decyl glucoside and glycolipid is provided, so that water droplets form or remain in a large size on the surfaces of the first and second electrode plates 110 and 120. can be minimized, and furthermore, due to menthyl anthranilate, performance is not impaired even when exposed to ultraviolet light for a long time.

In this case, the tension reducing layer 140 may be formed by spraying or coating the composition on the surfaces of the first and second electrode plates 110 and 120 and then drying the composition, where the tension reducing layer composition (hereinafter referred to as the tension reducing layer ( In the case of 140)), additional substances may be further included in addition to the above-described decyl glucoside, glycolipid, and menthyl anthranilate.

The tension reducing layer 140 may be prepared through preparing a first solution (S21), preparing a second solution (S22), and completing the tension reducing layer (S23).

(S21) preparing a primary solution

First, a first solution is prepared by mixing 15 to 40 parts by weight of decyl glucoside, 10 to 25 parts by weight of glycolipid, and 40 to 85 parts by weight of purified water.

Here, purified water provides the function of a solvent, and decyl glucoside and glycolipids, as described above, are excellent in surface activity and are excellent in reducing the surface tension of water droplets on the surfaces of the first and second electrode plates 110 and 120. did

(S22) preparing a secondary solution

Subsequently, a second solution is prepared by mixing 85 to 93 parts by weight of the first solution with 3 to 10 parts by weight of quercetin and 1 to 5 parts by weight of menthyl anthranilate.

Quercetin, also called quercetin, is a kind of glycoside belonging to the flavonoid family. It has an excellent antioxidant effect and has an effect of preventing oxidation of the tension reducing layer composition, and is added as an antioxidant for the tension reducing layer composition, especially lipids such as decyl glucoside and glycolipid.

As described above, menthyl anthranilate has an effect of blocking ultraviolet rays, and thus can prevent the surface tension reducing effect through the tension reducing layer from being inhibited by repeated exposure to ultraviolet rays.

(S23) Step of completing the tension reducing layer

Finally, 90 to 97 parts by weight of the secondary solution, 1 to 5 parts by weight of methylglucamine, and 1 to 10 parts by weight of Angelica Archangelica Callus Extract are mixed to complete the tension reducing layer.

Methylglucamine is a type of pH adjuster, and is added to adjust the pH of the surface of the first and second electrode plates 110 and 120 repeatedly exposed to snow or rain by adjusting the pH of the tension reducing layer. Therefore, it is generally added to prevent acidification of the tension reducing layer, which is repeatedly exposed to acidic snow or rain, and to stabilize the tension reducing layer.

Angelica Archangelica Callus Extract is an extract extracted by culturing callus (an unorganized flow cell mass of a plant) of Angelica (Angelica archangelica). At this time, there are no restrictions on the extraction method or extraction solvent. This angelica callus extract has an effect of helping to maintain quality by preventing oxidation of the tension reducing layer.

According to the tension reducing layer 140, it is possible to minimize the problem of forming or remaining large water droplets on the surfaces of the first and second electrode plates 110 and 120 by providing a surface tension reducing effect, and at the same time showing acidity. Even if it is repeatedly exposed to rain or rain, it is possible to prevent the tension reducing layer 140 from being acidified, thereby increasing stability, and further preventing oxidation to provide an effect of maintaining stable quality for a long time.

In order to explain the function of the tension reducing layer of the present invention described above, the evaluation results of Examples and Comparative Examples will be compared and described. The example consists of Examples 1 and 2, which are coating agents including the tension reducing layer of the present invention, and the comparative example is a surfactant-based coating agent.

<Example 1>

Decylglucoside 22g, Glycolipid 18g, Methylglucamine 10g. 100 g of the tension reducing layer composition was prepared by mixing 50 g of purified water.

The prepared tension reducing layer composition includes 44 parts by weight of decyl glucoside, 36 parts by weight of glycolipid, and 20 parts by weight of methylglucamine based on excluding the solvent (assuming a dry condition after coating treatment).

<Example 2>

Decylglucoside 30 g. Glycolipids 20 g. 100 g of the primary solution was prepared by mixing 50 g of purified water.

90 g of the prepared primary solution. Quercetin 5g. 100 g of a secondary solution was prepared by mixing 5 g of menthyl anthranilate.

Finally, 95 g of the prepared secondary solution. 2 g of methyl glucamine and 3 g of angelica callus extract were mixed to complete 100 g of the tension reducing layer composition.

The prepared tension reducing layer composition includes 44.8 parts by weight of decyl glucoside, 29.9 parts by weight of glycolipid, and 8.3 parts by weight of methylglucamine based on excluding the solvent (assuming a dry condition after coating treatment).

<Comparative example>

As a water-soluble surfactant, 40 g of cocoglucoside and 60 g of purified water were mixed.

[Experimental Example 1] Water solubility test

The appearance of Examples 1 and 2 to Comparative Examples and the presence or absence of insoluble matter were confirmed.

○: The solution is transparent and no insoluble matter is observed

△: The solution is cloudy, but no insoluble matter is observed

×: Some insoluble matter was confirmed

[Experimental Example 2] Dynamic surface tension test

The dynamic surface tensions of the 1% aqueous solutions of each of the above-described Examples 1 and 2 to Comparative Examples were measured at 1 Hz and 10 Hz using a bubble pressure dynamic surface tensiometer Kruss BP-100 manufactured by Kruss.

[Experimental Example 3] Contact angle test

Contact angles 30 seconds after each of Examples 1 and 2 to Comparative Examples were dropped onto SUS-304 manufactured by Test Panel Co., Ltd. were measured using a contact angle meter CA-D type manufactured by Kyowa Gamemen Chemical Co., Ltd.

[Experimental Example 4] Foaming test

20 ml of the 1% aqueous solution of each of Examples 1 and 2 to Comparative Examples was collected in a 100 ml measuring cylinder, and the bubble height (ml) was measured immediately after shaking for 1 minute under conditions of 180 times/min×40 mm and after 5 minutes. The foamability immediately after completion of shaking is 37ml or less, preferably 30ml or less, and the foamability after 5 minutes is 18ml or less, preferably 15ml or less.

Table 1 is a table showing the experimental results. Example 1 Example 2 comparative example water soluble ○ ○ ○ dynamic surface tension
(mN/m) 1Hz 33 32 45 10Hz 41 38 62 Contact angle (°) 13 11 24 foaming
(ml) right after 18 12 12 5 minutes later 8 3 15

As shown in Table 1, it can be seen that Examples 1 and 2 show higher surfactant ability due to lower dynamic surface tension, contact angle, and foaming properties than Comparative Example.

Furthermore, it can be confirmed that it can be more stabilized through the quercetin, methylglucamine, angelica callus extract, etc. of Example 2 compared to Example 1, thereby exhibiting a more excellent surfactant effect.

As described so far, the configuration and operation of the electrode and image fusion-based raindrop detection sensor according to the present invention are expressed in the above description and drawings, but this is only an example and the spirit of the present invention is limited to the above description and drawings. It is not, and of course, various changes and changes are possible within a range that does not deviate from the technical spirit of the present invention.

100: electrode sensor unit 110: first electrode plate
111: first extension 112: second extension
120: second electrode plate 130: heater
140: tension reduction layer 200: image sensor unit
210: first camera 220: second camera
230: sub camera 300: control unit
310: electrode precipitation database 320: image precipitation database
330: precipitation calculation unit 340: snow image database
350: image correction unit 360: heating image database
370: heating control unit

Claims (8)

As a raindrop detection sensor based on electrode and image fusion,
A first electrode plate having a primary contact area with water droplets, and a second electrode plate spaced apart from the lower end of the first electrode plate by a predetermined distance and making secondary contact with water droplets falling from the first electrode plate. an electrode sensor unit generating an open/short-based switching signal by water droplets falling between the first and second electrode plates;
an image sensor unit generating an image by photographing the surface of the first electrode plate;
An electrode precipitation database storing precipitation information according to the number of occurrences of the switching signal and the time of the short state, an image precipitation database storing a plurality of reference images according to the distribution of precipitation, and comparing the switching signal and the electrode precipitation database. In addition, a control unit including a precipitation calculation unit for comparing the image and the reference image to calculate the amount of precipitation; characterized in that it comprises a raindrop detection sensor. According to claim 1,
The first electrode plate,
It includes a first extension and a second extension bent and extended from the first extension,
The image sensor unit,
generating a first image obtained by photographing the surface of the first extension and a second image obtained by photographing the surface of the second extension;
The precipitation calculation unit,
The raindrop detection sensor, characterized in that the rainfall amount is calculated by comparing the switching signal with the electrode precipitation amount database and comparing the first and second images and the reference image, respectively. According to claim 2,
The control unit,
It includes a snow image database storing snow images classified according to snow, sleet, drizzle, heavy snow, and hail,
The precipitation calculation unit,
and a function of simultaneously comparing the first image with the reference image and the snow image. According to claim 1,
The image sensor unit,
A sub camera for generating a sub image by capturing an area around the first electrode plate;
The control unit,
and an image compensating unit that corrects the image by recognizing the presence and amount of foreign matter and light based on the sub image. According to claim 1,
In the first and second electrode plates,
A heater equipped with a hot wire is installed,
The control unit,
A heating image database for storing a heating image including a shape of a water droplet changed according to the level of the surface temperature of the first electrode plate heated by the heater,
The precipitation calculation unit,
The raindrop detection sensor characterized in that it includes a function of simultaneously comparing the image with the reference image and the heating image. According to claim 5,
In the first and second electrode plates,
Each thermometer is included,
The control unit,
and a heater control unit controlling a heating temperature of a heater mounted on at least one of the first and second electrode plates according to a temperature difference between the first and second electrode plates measured by the thermometer. sensor. According to claim 6,
The heater control unit,
The raindrop detection sensor characterized in that the heating temperature of a heater mounted on an electrode plate having a low surface temperature among the first and second electrode plates is increased and adjusted through Equation 1 below.
Equation 1,
(here, is the heating temperature over time, T is the initial surface temperature of the electrode plate subject to temperature control, is the surface temperature of the first electrode plate, is the surface temperature of the second electrode plate, is the continuous driving time of the heater, t is the length of time from the start of heating temperature control) According to claim 1,
On one side of the first and second electrode plates,
Decyl glucoside (Decyl glucoside) 20 to 50 parts by weight, glycolipid (glycolipid) 10 to 40 parts by weight and methylglucamine (Methylglucamine) 10 to 40 parts by weight of a tension reducing layer characterized in that the coating treatment, the rain drop detection sensor.