KR101987336B1 - Responsive control apparatus based on measuring amount of light - Google Patents

Abstract

The reaction type control device based on light quantity measurement is composed of an electronic film attached to a window of a vehicle and controlling transparency according to application of a current, a distance luminance (hereinafter referred to as " distance luminance " And an electronic film controller for controlling the application of the current based on the distance luminance to vary the transparency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a reaction-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a reaction type control technique, and more particularly, to a reaction type control technique in which a transparency of an electronic film attached to a windshield is varied on the basis of a moving state of a vehicle to reduce a visual fatigue of a driver, Based reactive control device.

Window control technology can change the transparency of the window by controlling the smart glass window whose transparency can be varied by the voltage. Conventional window control technology can control the window transparency in consideration of illumination and temperature factors, but it does not reflect the complex situations related to driving the vehicle, and thus it is required to develop a more effective technique for the driver of the vehicle.

Korean Patent Laid-Open Publication No. 10-2017-0032556 (published on Mar. 23, 2017) discloses a smart window system and a control method thereof, and is provided with a display device, an input device for receiving a control command for the display device, And a controller for determining the transparency of the display element.

Korean Patent Laid-Open Publication No. 10-1999-0009845 (published on Mar. 02, 1999) discloses an optical transmittance adjusting device for windshield glass for automobiles, which is built in a windshield glass and has a liquid crystal film ; A battery for supplying a voltage to the liquid crystal film; A control unit provided between the battery and the liquid crystal film for controlling the voltage of the battery to be selectively supplied to the liquid crystal film according to ambient brightness; And an optical sensor for sensing the brightness of the front surface of the vehicle with the control unit.

Korean Patent Publication No. 10-2017-0032556 (published on Mar. 23, 2017) Korean Patent Laid-Open Publication No. 10-1999-0009845 (published Feb. 5, 1999)

An embodiment of the present invention provides a reaction-based control device based on light quantity measurement that can reduce the visual fatigue of a driver and reduce the risk of an accident by varying the transparency of an electronic film attached to a windshield on the basis of a moving state of a vehicle I want to.

An embodiment of the present invention is to provide a light intensity measurement-based responsive control device that minimizes cancer adaptation or nominal adaptation time of a vehicle driver through measurement of distance luminance.

One embodiment of the present invention is to provide a method and system for controlling the amount of light based on a light quantity measurement based on a speed of a vehicle, which can gradually change the transparency to minimize the visual burden on the driver, Device.

Among the embodiments, the reaction type control device based on the light amount measurement includes an electronic film attached to a windshield of a vehicle and controlling transparency according to the application of a current, a luminance of a specific point (hereinafter referred to as a distance luminance) determined according to the speed of the vehicle, And an electronic film controller for controlling the application of the current based on the distance luminance to vary the transparency.

The electronic film may be a PLDC (Polymer Dispersed Liquid Crystal) film having a thickness of 10 to 50 탆.

The distance luminance sensor may cause the specific point to be distanced when the speed of the vehicle is increased, and may be made to approach the specific point when the speed of the vehicle is decreased.

The distance luminance sensor may previously calibrate the reference point corresponding to the reference speed as the specific point by reflecting the driver's characteristics in advance.

Wherein the light quantity measurement-based responsive control device further comprises an image sensor for generating a face image of a driver of the vehicle, wherein the electronic film control unit detects the state of the vehicle driver based on the face image, Can be controlled.

The electronic film control unit may detect the size of the pupil in the face image and additionally control the controlled transparency based on the detected pupil size with respect to the luminance of the specific point.

The electronic film controller may detect whether the driver of the vehicle is drowsy based on the face image, and flash the electronic film at a specific interval.

The electronic film control unit may adjust the specific interval according to the following equation.

[Mathematical Expression]

Specific interval = (reference time * vehicle speed) / degree of drowsiness

The disclosed technique may have the following effects. It is to be understood, however, that the scope of the disclosed technology is not to be construed as limited thereby, as it is not meant to imply that a particular embodiment should include all of the following effects or only the following effects.

The response type control device based on the light amount measurement according to an embodiment of the present invention can reduce the visual fatigue of the driver and reduce the risk of accident by varying the transparency of the electronic film attached to the window glass based on the moving state of the vehicle .

The reactive control device based on the light amount measurement according to the embodiment of the present invention supports the minimization of the cancer adaptation or the adaptation time of the vehicle driver through the measurement of the distance luminance.

The response type control apparatus based on the light amount measurement according to the embodiment of the present invention can gradually change the transparency based on the speed of the vehicle to minimize the visual burden on the vehicle driver due to the adaptation of the contrast .

FIG. 1 is a view for explaining a light intensity measurement-based reactive control apparatus according to an embodiment of the present invention.
2 is a view for explaining a process of measuring the distance luminance by the distance luminance sensor of FIG.
FIG. 3 is a flowchart illustrating a process of varying the transparency according to the distance luminance of the reaction type control apparatus based on the light amount measurement shown in FIG.
FIG. 4 is a view showing an embodiment of a process of varying the transparency according to the distance luminance of the reaction type control apparatus based on the light amount measurement shown in FIG.

The description of the present invention is merely an example for structural or functional explanation, and the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

It is to be understood that the singular " include " or "have" are to be construed as including the stated feature, number, step, operation, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In each step, the identification code (e.g., a, b, c, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, Unless otherwise stated, it may occur differently from the stated order. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present application.

FIG. 1 is a view for explaining a light intensity measurement-based reactive control apparatus according to an embodiment of the present invention. 1 is a cross-sectional view of a reactive-type control device 100 based on a light amount measurement installed in a vehicle 10 according to an embodiment, as seen from the front side of the vehicle 10. As shown in FIG.

Referring to FIG. 1, a light intensity measurement based reactive control apparatus 100 may include an electronic film 110, a distance luminance sensor 120, an electronic film control unit 130, and an image sensor 140.

The electronic film 110 is attached to the windshield 15 of the vehicle 10 and controls transparency according to the application of electric current. In one embodiment, the electronic film 110 may be attached to the inner side of the windshield 15, and when the application of the electric current is controlled according to the control of the electrically connected electronic film controller 130, The arrangement of the polymeric materials formed inside may be controlled to make a difference in transparency. In one embodiment, the windshield 15 may comprise at least one of a front windshield, a side windshield, and a rear windshield. For example, the electronic film 110 may be attached to the front windshield, the side windshields, and the rear windshield of the vehicle 10 so that the respective currents are controlled simultaneously or independently according to the control of the electronic film control unit 130 .

The electronic film 110 may be embodied as an electrochromic glass. In one embodiment, the electronic film 110 may be implemented as a Polymer Dispersed Liquid Crystal (PLDC) film, and may be implemented to have a thickness of, for example, 10 to 50 μm.

Here, the PLDC film is a polymer dispersed liquid crystal film, and has a different arrangement in accordance with the current flow, so that the transmittance of light introduced from the outside can be controlled. For example, in a PLDC film, when a voltage is applied, the polymer material in the polymer film forms a certain arrangement according to the current flow, so that the PLDC film can be in a transparent state through which external light passes, It can become a scattering opaque state.

In one embodiment, the electronic film 110 is implemented as a PLDC film having a bonding structure in which a liquid crystal and a polymer material are coated between a first conductive film disposed on the front side and a second conductive film disposed on the rear side And may be integrally implemented in the window 15.

The distance luminance sensor 120 measures a luminance of a specific point (hereinafter referred to as a distance luminance) determined according to the speed of the vehicle 10. [ This will be described in more detail with reference to FIG.

2 is a view for explaining a process of measuring the distance luminance by the distance luminance sensor of FIG.

2, the distance luminance sensor 120 can determine a specific point based on the speed of the vehicle 10 and measure the distance luminance to the specific point. More specifically, the distance luminance sensor 120 may store information on a reference point according to a reference speed previously set by a designer or a user, and may calculate a reference point based on the speed of the vehicle 10 And the brightness of the reference time point can be measured.

In one embodiment, the distance luminance sensor 120 is configured to determine the reference brightness of the vehicle 10 based on a reference speed-reference point setting table that matches a plurality of reference speeds with a plurality of reference points 20, (For example, 20a) can be detected and the luminance for the corresponding point can be measured. In one embodiment, the reference speed-reference point setting table may define a reference point that matches each reference speed through a specific range including a specific value, and may include a measurement setting value for measuring the luminance of the reference point For example, a measurement angle or focus setting information). For example, if the speed of the vehicle 10 is 60 km / h, the distance luminance sensor 120 brings the first reference point 20a 50m according to the first reference speed 60km / h in the reference speed-reference point setting table The first reference point 20a can be set as a specific point and the distance luminance of the corresponding point can be measured based on the distance information and the setting information of the point.

In one embodiment, the distance luminance sensor 120 may cause a particular point to move away from the vehicle 10 as the speed of the vehicle 10 increases and to approach a certain point as the speed of the vehicle 10 decreases. For example, when the speed of the vehicle 10 is 60 km / h and the vehicle speed is increasing, the distance brightness sensor 120 calculates a distance from the vehicle 10 ), And when the speed is decreasing, the specific point can be lowered by a specific value or ratio, and if there is no speed increase or decrease, the specific point can be maintained.

In one embodiment, the distance luminance sensor 120 may determine a specific point by calculating a predicted travel distance after a certain time based on the speed of the vehicle 10. For example, if the driving speed of the vehicle 10 is currently 72 km / h, the distance luminance sensor 120 calculates a predicted moving distance of 60 m after a specific time of 3 seconds and specifies a point 60 m away from the vehicle 10 Point. Here, the specific time can be preset and adjusted by the user or the designer.

In this embodiment, the distance luminance sensor 120 may adjust the specific time upward or downward within a limited range based on the speed of the vehicle 10 to be proportional to the speed. For example, if the driving speed of the vehicle 10 is 100 km / h or more, the distance luminance sensor 120 adjusts the specific time to 50% higher than the preset default value of 2 seconds. If the driving speed is less than 50 km / Otherwise, the default value of 2 seconds can be maintained.

In one embodiment, the distance luminance sensor 120 may be implemented as a luminance sensor that is installed inside the vehicle 10 and senses luminance by detecting the brightness of light with respect to a specific point inside and outside the vehicle 10 . In one embodiment, the distance luminance sensor 120 may further include an illuminance sensor installed inside or outside the vehicle 10 to measure the amount of light. In one embodiment, the distance luminance sensor 120 may be electrically connected to the engine control unit of the vehicle 10 to receive the speed of the vehicle 10 in real time, and in another embodiment, And can be electrically connected to GPS (Global Positioning System) or navigation provided in the vehicle 10 to receive the speed of the vehicle 10 in real time.

In one embodiment, the distance luminance sensor 120 may pre-calibrate the reference point according to the reference speed as a specific point in advance by reflecting the driver's characteristics in advance. In one embodiment, the driver characteristics may include at least one of visual acuity, driving visual acuity and visual acuity, each of which may be specified by the user via user settings. For example, when the driver's visual acuity [high], the driver's visual field [wide], and the visual sensitivity [high] are stored as information related to driver characteristics, the distance luminance sensor 120 calculates a reference speed- It is possible to generate a calibration version (revision) of the reference speed-reference point setting table in which the reference speeds of the original are lowered based on the original of the reference point setting table at a specific ratio, The electronic film controller 130 controls the application of the electric current based on the distance luminance to vary the transparency of the light source based on the distance luminance. . In one embodiment, the electronic film control unit 130 determines whether the distance luminance measured by the distance luminance sensor 120 corresponds to the first reference luminance range (for example, 100 lux or more and less than 300 lux) (For example, 90%), and if the current corresponds to a second reference luminance range (for example, 300 lux or more and less than 500 lux), the current is changed to have a second transparency And the transparency of the electronic film 110 can be controlled by varying the current to have a third transparency (for example, 70%) when the third reference luminance range (for example, 500 lux or more) .

The electronic film control unit 130 can control the application of current based on the difference between the distance luminance and the luminance within the vehicle 10 to vary the transparency of the electronic film 110. [ In one embodiment, the distance luminance sensor 120 may measure the luminance within the vehicle 10 at a specific period separately from the measurement of the distance luminance, and the electronic film control unit 130 may measure the luminance within the vehicle 10 by the distance luminance sensor 120 The transparency of the electronic film 110 can be reduced if the difference between the measured distance luminance and the luminance within the vehicle 10 is equal to or greater than a specific reference difference.

2, for example, the electronic film control unit 130 determines the distance (distance) between the first reference point 20c and the third reference point 20c, with the luminance of the interior of the vehicle 10 being 500 lux and the third reference point 20c, Assuming a situation where the luminance is 50 lux and the reference difference about the luminance difference is 300 lux (in a situation where the light is going to enter a dark tunnel soon as in FIG. 2), the difference between the distance luminance and the luminance inside the vehicle 10 It is possible to reduce the current of the electronic film 110 so that the transparency of the electronic film 110 becomes 70% of the first reference transparency of 70% If the difference between the luminances is reduced, the second reference transparency can be adjusted up to 90%.

Accordingly, when the luminance difference is large, the electronic film controller 130 controls the luminance to be opaque in advance to an appropriate level, and when the luminance difference is small, the electronic film controller 130 is transparently adjusted to an appropriate level again so that the driver can feel relatively less the luminance difference. can do.

In one embodiment, the electronic film controller 130 may control the application of the current through at least one change interval based on the distance luminance, thereby gradually changing the transparency of the electronic film 110. More specifically, when the transparency value to be varied on the basis of the distance luminance is calculated, the electronic film control unit 130 determines whether the current transparency value, the distance luminance, the specific distance, the luminance inside the vehicle 10, At least one change interval for gradually changing the transparency based on one can be set. Here, each of the at least one change interval may include a time interval and a transparency change value.

For example, in FIG. 2, the electronic film controller 130 detects a situation in which the distance luminance 50 lux and the current transparency value of the third reference point 20c set at the luminance 500 lux, 60m inside the vehicle 10 is 90% Assuming that the transparency value to be varied on the basis of the luminance difference between the luminance of 500 lux inside the vehicle 10 and the luminance of the distance luminance of 50 lux is set to 60% And can be set to three consecutive change intervals with intervals of 20m on the basis of the third reference point 20c of the corresponding 60m. In the first change interval in which a movement of 20m is predicted based on the current velocity, The value 90% is changed to 80% downward by 10%, the variable transparency value 80% is changed down by 70% to 10% in the second change period in which the next 20m movement is predicted, and the third change Finally, the transparency value is reduced to 60% Sikieo, it is possible to vary the transparency gradually.

Accordingly, even though the transparency value to be varied is greater than the current transparency value, the electronic film controller 130 can gradually change the reference value based on the current speed so that the driver can feel relatively less the difference in brightness.

Since the difference between the distance luminance and the luminance within the vehicle 10 is larger than the reference difference, the current of the electronic film 110 can be reduced so that the transparency of the electronic film 110 becomes the predetermined reference transparency of 70%. Accordingly, when the luminance difference is large, the electronic film controller 130 may control the opacity to an appropriate level in advance so that the driver may feel relatively less the difference in luminance.

The image sensor 140 may generate a face image of the vehicle operator. In one embodiment, the image sensor 140 may generate a face image by imaging a stereoscopic image or a planar image of the upper half of the vehicle driver. In one embodiment, the image sensor 140 may be implemented as a complementary metal-oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD) image sensor.

At this time, the electronic film control unit 130 can detect the state of the driver of the vehicle based on the face image and additionally control the controlled transparency. More specifically, the electronic film control unit 130 analyzes a series of facial images generated by the image sensor 140 to determine whether the movement or size change of at least one specific body part in the face image is equal to or greater than a reference value It is possible to determine the state of the vehicle driver as one of a plurality of states that are set in advance, and to change the previously-controlled transparency further upwardly or downwardly when the state of the determined vehicle driver corresponds to a predetermined specific state.

In one embodiment, the electronic film control unit 130 can calculate the dynamic degree of change with respect to the movement or the size of each part of the body, and the calculated dynamic degree of change with respect to a specific body part (for example, the eyes) When the condition is satisfied, additional control of transparency can be determined.

In one embodiment, the electronic film control unit 130 may detect the size of the pupil in the face image and additionally control the controlled transparency based on the detected pupil size relative to the brightness of the specific point. More specifically, the electronic film controller 130 may adjust the transparency upward if the brightness of the specific point is equal to or greater than the reference brightness and the detected pupil size is equal to or greater than the reference magnitude. For example, the electronic film controller 130 may determine the transparency of the electronic film 110 if the luminance of the specific point is bright above the reference value, the pupil size of the driver is large, darker than the reference value, and the pupil size of the driver is small. It can be changed transparently.

The electronic film control unit 130 may detect whether the driver of the vehicle is drowsy based on the face image, and flash the electronic film 110 at a specific interval. In one embodiment, the electronic film controller 130 collects a face image of the driver of the vehicle from a start-up of the vehicle 10 at a specific period (for example, every 10 seconds) to determine the average eye size of the current vehicle driver And the vehicle driver's eye size detected during a recent specific time (for example, during the last 10 minutes) is smaller than a predetermined ratio (for example, 50%) than the calculated average eye size If the dynamic change degree of the motion is less than a preset reference dynamic change degree, the current state of the driver is judged to be a sleepiness state, and the transparency of the electronic film 110 within a predetermined interval, And to alert the driver of the drowsy driving in a manner that varies between the highest range.

The electronic film controller 130 can adjust the specific interval according to the following equation. For example, the electronic film control unit 130 determines that the current driver of the vehicle is in a drowsy state based on the eye size in the face image of the driver of the vehicle and the calculated degree of drowsiness is 3 (drowsiness 1: If the reference time is 1 second and the speed of the vehicle 10 is 60 km / h, the specific interval is calculated as 20 seconds and the electronic film 110 is flickered at the interval .

[Mathematical Expression]

Specific interval = (reference time * vehicle speed) / degree of drowsiness

(Here, the reference time can be preset by the designer or the user, the vehicle speed represents the current speed of the vehicle 10, and the degree of drowsiness is an index of drowsiness calculated based on the image of the face of the driver of the vehicle , Natural number of 1 or more and 5 or less)

In one embodiment, the electronic film control unit 130 can additionally adjust the degree of change of transparency based on the moving direction of the vehicle 10, the weather, and the current time. For example, if the moving direction of the vehicle is related to the east on the GPS and the sun is clear and the current time is AM, the electronic film controller 130 determines that the sunlight is strongly lowered to the driver of the vehicle, It is possible to additionally control the downward addition control.

In one embodiment, the electronic film control 130 may further adjust the weather to a specific point. For example, the distance luminance sensor 120 can perform additional control to additionally raise the predetermined specific point by 5% in a clear weather.

The electronic film control unit 130 can control the overall operation of the reaction-type control apparatus 100 based on the light amount measurement and is electrically connected to the electronic film 110, the distance luminance sensor 120, and the image sensor 140 May control the flow of data between them, and in one embodiment may be implemented as a processor.

In one embodiment, the photometric-based reactive control device 100 may be installed in the vehicle 10 and may be implemented integrally with the vehicle 10 or may be an independent device with a processor, memory, and user input / output means Can be implemented. The electronic film controller 130 can immediately change the transparency of the electronic film 110 according to the user input when the user input relating to the transparency immediately variable is received through the user input / output means.

FIG. 3 is a flowchart illustrating a process of varying the transparency according to the distance luminance of the reaction type control apparatus based on the light amount measurement shown in FIG.

3, the distance luminance sensor 120 measures the luminance of a specific point determined according to the speed of the vehicle (step S310). The electronic film controller 130 controls the application of the electric current of the electronic film 110 based on the distance luminance to vary the transparency (step S320). The electronic film 110 can control the transparency according to the control of the electric current according to the control of the electronic film controller 130.

In one embodiment, the reaction-type control device 100 based on the light amount measurement can reduce the eye-sight of the driver by changing the transparency by detecting the brightness of the outside, and the transparency is immediately variable through the user input / output means The user can visually limit or block the inside and the outside of the vehicle 10 by adjusting the transparency of the electronic film 110 attached to the windshield 15 of the vehicle 10 or the side window, It is possible to protect the driver when the same situation occurs and the visual fatigue of the driver can be reduced by adjusting the transparency through the measurement of the distance luminance in a situation where the luminance change is predicted according to the movement of the vehicle 10. [

4 is a view showing an embodiment of a process of varying the transparency according to the distance luminance of the reaction type control apparatus based on the light amount measurement shown in FIG.

4, the light-amount-based reactive control device 100 maintains the transparency of the electronic film 110 at an appropriate level based on the distance luminance at a specific point determined according to the speed of the vehicle 10 And when the distance luminance is measured to be low in the course of entering the tunnel, transparency of the electronic film 110 is changed downward to increase the degree of opacity, thereby minimizing the cancer adaptation time of the driver entering the dark tunnel. When the distance luminance is measured high in the course of entering the tunnel, the transparency of the electronic film 110 is changed upward to improve the degree of transparency, thereby minimizing the adaptation time of the driver who departs from the dark tunnel.

In one embodiment, the light intensity-based responsive control apparatus 100 controls the current of the electronic film 110 so that progressive transparency can be varied based on the velocity of the vehicle 10 during such adjustment process, Thereby reducing visual fatigue and minimizing the risk of accidents.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as set forth in the following claims And changes may be made without departing from the spirit and scope of the invention.

10: vehicle 15: windshield
100: Response control system based on light intensity measurement
110: electronic film 120: distance luminance sensor
130: electronic film controller 140: image sensor

Claims (8)

An electronic film attached to a windshield of a vehicle and controlling transparency according to application of electric current;
A distance luminance sensor for measuring a luminance of a specific point (hereinafter referred to as a distance luminance) determined according to the speed of the vehicle;
An image sensor for generating a face image of the vehicle driver; And
And an electronic film control unit for controlling the application of the current based on the distance luminance to vary the transparency and detecting the state of the vehicle driver based on the face image to additionally control the controlled transparency,
The electronic film control unit
Detecting the drowsiness of the driver based on the face image, blinking the electronic film at specific intervals, and adjusting the specific interval according to the following equation.
[Mathematical Expression]
Specific interval = (reference time * vehicle speed) / degree of drowsiness
The electronic film according to claim 1,
Wherein the polymer is a polymer dispersed liquid crystal (PLDC) film having a thickness of 10 to 50 탆.
The apparatus of claim 1, wherein the distance luminance sensor
Wherein when the speed of the vehicle is increased, the specific point is moved away, and when the speed of the vehicle is decreased, the specific point is brought closer.
The apparatus as claimed in claim 3, wherein the distance luminance sensor
And the reference point corresponding to the reference speed is previously calibrated as the specific point by reflecting the driver characteristic in advance.
delete The apparatus of claim 1, wherein the electronic film control unit
Wherein the pupil size of the face image is detected and the controlled transparency is additionally controlled based on the size of the detected pupil with respect to the brightness of the specific point.
delete delete

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