CN106985640B - Active anti-dazzling method and active anti-dazzling device for automobile - Google Patents
Active anti-dazzling method and active anti-dazzling device for automobile Download PDFInfo
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- CN106985640B CN106985640B CN201710284333.5A CN201710284333A CN106985640B CN 106985640 B CN106985640 B CN 106985640B CN 201710284333 A CN201710284333 A CN 201710284333A CN 106985640 B CN106985640 B CN 106985640B
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000005192 partition Methods 0.000 claims abstract description 62
- 238000002834 transmittance Methods 0.000 claims abstract description 60
- 239000011521 glass Substances 0.000 claims abstract description 45
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 12
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- 238000001514 detection method Methods 0.000 abstract description 34
- 230000032683 aging Effects 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 230000004313 glare Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000011897 real-time detection Methods 0.000 description 4
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J1/00—Windows; Windscreens; Accessories therefor
- B60J1/02—Windows; Windscreens; Accessories therefor arranged at the vehicle front, e.g. structure of the glazing, mounting of the glazing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J3/00—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles
- B60J3/04—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles adjustable in transparency
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- Engineering & Computer Science (AREA)
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- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
The invention relates to an active anti-dazzling method and an active anti-dazzling device for an automobile, wherein dimming glass provided with a plurality of mutually independent liquid crystal film partitions is used as a front windshield of the automobile, the light intensity of various light sources in front of the automobile is detected in real time, the light source which can cause dazzling to the driver of the automobile is found out, the partition of the intersection point of the light emitted by the light source to the human eyes on the dimming glass is found out through positioning the light source, eyes of the driver and the dimming glass, and the light transmittance of the corresponding partition is regulated through regulating current. The device comprises a front windshield, a controller, light intensity detection equipment, light source position detection equipment and human eye positioning equipment, wherein the front windshield adopts electric control dimming glass, a liquid crystal film in the dimming glass is arranged into a plurality of mutually independent partitions, and each partition, each detection equipment and the human eye positioning equipment are connected with the controller by data. The automobile interior trim anti-dazzling device can actively prevent dazzling, improve driving safety and effectively delay aging of automobile interior trim.
Description
Technical Field
The invention relates to an active anti-dazzling method and an active anti-dazzling device for an automobile, and belongs to the technical field of automobile illumination.
Background
With the rapid development of automobile technology, automobile driving safety is increasingly emphasized. Especially, during night driving, the lights of vehicles traveling opposite, the lights of the flash lamps of the road cameras and the strong lights under various emergency conditions can irritate eyes of the drivers to cause dazzling. Currently, common anti-glare modes include anti-glare headlamps, anti-glare glasses, anti-glare liquid crystal displays and the like. The anti-dazzling headlamp can reduce the risk of dazzling the driver of the opposite vehicle to a certain extent, but if the opposite vehicle is not provided with the anti-dazzling headlamp, the driver of the vehicle is extremely likely to be dazzled, so that the driving safety of the driver of the vehicle is dangerous. Although the anti-glare glasses can prevent the driver of the vehicle from being glared, the driver is required to wear the glasses all the time, so that great inconvenience is brought to the driver, and the glare glasses cannot prevent strong light such as sunlight from being emitted into the vehicle, so that the aging of the interior trim caused by the strong light cannot be inhibited or delayed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an active anti-dazzling method and an active anti-dazzling device for an automobile, which can adapt to the characteristic that the light in the running environment of the automobile is continuously changed, realize the anti-dazzling purpose in real time, improve the running safety, and effectively reduce the incidence of strong light into the automobile so as to prolong the service life of the interior decoration of the automobile.
The main technical scheme of the invention is as follows:
an active anti-dazzling method comprises the following steps: the method comprises the steps of adopting electric control dimming glass to serve as a front windshield of an automobile, setting a liquid crystal film in the dimming glass into a plurality of mutually independent partitions, controlling all the partitions to be in a completely transparent state under an initial state according to the change of current intensity, detecting the light intensity of various light sources in front of the automobile in real time, judging whether the corresponding light sources can cause dazzling to the driver of the automobile according to the light intensity, if the light sources which can cause the dazzling to the driver of the automobile exist, positioning the light sources, determining the space coordinates of the corresponding light sources, positioning eyes of the driver of the automobile and the front windshield, determining the space coordinates of the eyes and the front windshield, calculating the intersection point coordinates of the light rays of the eyes of the driver of the corresponding light sources and the front windshield, determining the partition to which the corresponding intersection point belongs, adjusting the light transmittance of the corresponding partition to reach the non-dazzling degree by adjusting the current of the corresponding partition, and readjusting the light transmittance of the partition to the completely transparent state when the light sources which can cause the dazzling to the driver of the automobile are changed from existence to nonexistence.
The method for judging whether the corresponding light source can cause dazzling to the driver of the vehicle according to the light intensity can be as follows: and comparing the light intensity of various light sources in front of the automobile with a preset light intensity value, if the light intensity of the light source is larger than or equal to the preset light intensity value, judging that the corresponding light source can cause dazzling to a driver of the automobile, otherwise, judging that the corresponding light source cannot cause dazzling to the driver of the automobile, wherein the preset light intensity value is the lowest light intensity value which can cause the driver of the automobile to dazzle when the front windshield is in a completely transparent state.
The method for determining the intersection point coordinates comprises the following steps: when the light source is a point light source, calculating the coordinate of an intersection point of the light rays emitted by the point light source to the eyes of the driver of the vehicle and the front windshield, when the light source is not the point light source, obtaining the boundary of the light source, dividing the boundary into a plurality of sections, respectively obtaining the space coordinates of the demarcation points, and calculating the coordinate of the intersection point of the light rays emitted by the demarcation points to the eyes of the driver of the vehicle and the front windshield.
The method for reducing the light transmittance of the corresponding subarea to ensure that the light transmitted through the subarea reaches the non-dazzling degree is preferably as follows: calculating the light transmittance safety limit value of the corresponding partition according to the ratio of the preset light intensity value to the light intensity of the light source, selecting a light transmittance target value from zero to the light transmittance safety limit value, enabling the difference value between the light transmittance safety limit value and the light transmittance target value to be in a set range, obtaining a current intensity target value corresponding to the light transmittance target value according to the positive correlation between the light transmittance and the current intensity, and reducing the current intensity of the corresponding partition to the current intensity target value.
When a plurality of intersections belong to the same partition at the same time, the sum of the light intensities of the light rays corresponding to all the intersections of the partition is preferably used as the light intensity of the light source used when the light transmittance of the corresponding partition is reduced.
When the automobile is in a non-driving state, the power supply of all the subareas can be turned off, so that all the subareas are in a completely opaque state; or when the automobile is in a non-driving state, and the maximum value of the light intensity of various light sources in front of the automobile exceeds a set value, the power supply of all the subareas is turned off, so that all the subareas are in a completely opaque state.
The partitions are preferably arranged in a matrix of M rows and N columns, where M.gtoreq.1 and N.gtoreq.2 or M.gtoreq.2 and N.gtoreq.1.
Preferably, a photosensitive sensor and/or a camera is/are adopted to detect the light intensity of the light source in real time, the photosensitive sensor and/or the camera is adopted to position the light source, the camera is adopted to position eyes and a front windshield of a driver of the vehicle, the built-in controller of the vehicle-mounted ADAS system is adopted to judge whether the light source can cause dazzling to the driver of the vehicle, the intersection point coordinates are calculated, the intersection point belongs to the subarea is determined, and the subarea current is regulated, wherein the specific implementation mode of regulation of the subarea current is that the built-in controller automatically addresses according to the determined position of the subarea, and a control signal related to the current intensity value to be applied to the corresponding subarea is transmitted to the corresponding subarea of the light-regulating glass.
The automobile active anti-dazzling device for realizing any one of the active anti-dazzling methods comprises a front windshield, a controller, light source light intensity detection equipment, light source position detection equipment and human eye positioning equipment, wherein the front windshield adopts electric control dimming glass, a liquid crystal film inside the dimming glass is arranged into a plurality of mutually independent subareas, each subarea of the dimming glass, the light source light intensity detection equipment, the light source position detection equipment and the human eye positioning equipment are connected with the controller by average data, and the on-off power and the current of each subarea are controlled by the controller.
The dimming glass can be provided with a data interface, and each partition of the dimming glass performs data interaction with the controller through the data interface.
The controller preferably adopts a built-in controller of a vehicle-mounted ADAS (advanced automatic analysis system), the light source light intensity detection device and the light source position detection device preferably adopt the light source detection device built-in the ADAS, the human eye positioning device adopts the human eye positioning device built-in the ADAS, the built-in controller comprises a control unit and a storage unit, and the storage unit, the light source light intensity detection device, the light source position detection device and the human eye positioning device are all connected with the control unit. The light source detection device can adopt a camera and/or a photosensitive sensor, and the human eye positioning device adopts the camera.
The beneficial effects of the invention are as follows:
according to the invention, the light transmittance of different subareas of the front windshield of the automobile is adjusted in real time according to the real-time detection result of the light intensity of the front light, so that various dazzling light which is emitted in front in the driving process can be prevented from irritating eyes of drivers of the automobile, the dazzling can be avoided, the direct sunlight and the dazzling of reflected light can be prevented in daytime, the dazzling caused by the far light of the opposite automobile and the flash light of the traffic camera can be prevented at night, the occurrence rate of traffic accidents is greatly reduced, and the driving safety of the automobile is improved.
The detection of the light intensity of the light source outside the automobile and the positioning of the light source, the eyes of the driver and the front windshield are performed in real time, so that the position of the target zone to be adjusted can be changed in real time according to the relative position change of the glaring light source, the eyes of the driver and the front windshield, the reaction is quick, the instantaneity is good, and the method is very suitable for active anti-dazzling in the dynamic process of automobile running.
The vehicle-mounted ADAS system can control the light transmittance of each partition of the dimming glass and detect the environment, so that the corresponding anti-dazzling method is very easy to implement, and the control part does not need to pay extra high-cost investment.
The invention can effectively ensure the driving safety of the driver of the vehicle, is convenient to use and flexible to control, and can not bring uncomfortable feeling of long-term wearing to the driver like shading eyes.
When the automobile is in a non-driving state, the power supplies of all the subareas can be automatically or manually turned off, so that the whole front windshield is in a completely opaque state, the aging of the automobile interior trim caused by the fact that sun rays are injected into the automobile can be effectively prevented, and the service life of the automobile interior trim is prolonged.
Drawings
FIG. 1 is an anti-glare schematic diagram for several common external light sources;
FIG. 2 is an enlarged partial view of one embodiment;
FIG. 3 is a schematic diagram of the position of the intersection of a, b, c, d light rays in a zone of dimming glass according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating transmittance adjustment of a zone of a light-adjusting glass where four light intersections a, b, c, d are located according to an embodiment of the present invention;
FIG. 5 is a workflow diagram of an active anti-glare method of the present invention;
fig. 6 is a schematic structural diagram of an active anti-glare device for an automobile according to the present invention.
Reference numerals: 1. the car runs opposite; 1-1, emitting light rays from an automobile headlamp for opposite traveling; 1-2, reflecting light rays after the road surface rainwater is reflected; 2. road surface camera; 2-1, light rays emitted by a road surface camera; 3. sun is carried out; 3-1, sun rays; 4. an automobile equipped with the active anti-glare device of the present invention; 5. the eyes of the driver of the vehicle; 6. a vehicle-mounted ADAS system; 7. a windshield; a. b, c and d are the intersection points of the light rays 1-1, 1-2, 2-1, 3-1 entering the eyes of the driver and the windshield respectively; A. b, C, D are the zones where the intersection a, b, c, d, respectively, is located on the windshield; e. a glare area formed by a beam of intense light on the windshield; E. the area occupied by the glare area e on the windshield.
Detailed Description
As shown in fig. 1-6, the present invention discloses an active anti-glare method and an active anti-glare device for an automobile for implementing the method. The active anti-dazzling method comprises the following steps: an electrically controlled dimming glass is adopted to serve as a front windshield 7 of the automobile 4, and liquid crystal films inside the dimming glass are arranged into a plurality of mutually independent partitions. The light transmittance of the partitions decreases as the current intensity decreases, and thus the light transmittance of each partition may be changed by adjusting the current intensity of each partition. The light transmittance and the current intensity are in positive correlation, and when the current with the maximum allowable current intensity is supplied, the corresponding subarea is in a completely transparent state (the state with the highest light transmittance); when the power is turned off, the corresponding partition assumes a completely opaque state (state where light transmittance is lowest). The method comprises the steps of firstly controlling all subareas to be in a completely transparent state under an initial state (for example, when an automobile is started), detecting the light intensity of various light sources in front of the automobile in real time, judging whether the corresponding light sources can cause dazzling to an automobile driver according to the light intensity, if the light sources which can cause the dazzling to the automobile driver (can be called as the dazzling light sources), positioning the light sources, determining the space coordinates of the corresponding light sources, positioning eyes 5 of the automobile driver and a front windshield, determining the space coordinates of the eyes and the front windshield, calculating the intersection point coordinates of light rays (also called as the dazzling light rays) of the corresponding light sources, which are directed to the eyes of the automobile driver, of the front windshield, determining the subareas to which the corresponding intersection points belong, adjusting the current of the corresponding subareas between zero and the maximum allowable current intensity, reducing the light transmittance of the corresponding subareas so as to reduce the light intensity of light rays which are emitted into eyes of the automobile driver, and ensuring the light rays which penetrate the subareas to reach the degree of no dazzling, thereby avoiding the driver. When the light source which can cause dazzling to the driver of the vehicle is changed from the existence to the nonexistence, the subarea with the reduced light transmittance is readjusted to the completely transparent state.
The positioning of the glare source and the positioning of the eyes of the driver of the vehicle may be performed in real time from the beginning, but the calculation of the coordinates of the intersection point is performed only if there is a light source that would cause glare to the driver of the vehicle. The disadvantage is that the real-time detection of this approach is more labor intensive. The invention preferably adopts the following modes: when judging that a light source which can cause dazzling to a driver of the vehicle exists, automatically starting real-time positioning of the dazzling light source, eyes of the driver of the vehicle and a front windshield, automatically calculating an intersection point, determining a subarea to which the intersection point belongs, and further controlling light transmittance of the corresponding subarea.
The method for judging whether the corresponding light source can cause dazzling to the driver of the vehicle according to the light intensity can be as follows: and comparing the light intensity of various light sources in front of the automobile with a preset light intensity value, if the light intensity of the light source is greater than or equal to the preset light intensity value, judging that the corresponding light source can cause dazzling to a driver of the automobile, otherwise, judging that the driver cannot be dazzled. The preset light intensity value is the lowest light intensity value which can lead a driver of the vehicle to be dazzled when the front windshield is in a completely transparent state. If at least one light source is determined to be blinding the driver of the host vehicle at a certain time, it is indicative that there is a light source that is blinding the driver of the host vehicle.
The various light sources in front of the automobile can be common light sources listed in the embodiment, for example, light rays 1-1 emitted by the lamps of the opposite-traveling vehicle 1, light rays 1-2 reflected by accumulated water on the road surface, light rays 2-1 emitted by the road surface camera 2 and dazzling sun light rays 3-1 emitted by the sun 3, and can also be all other light sources which can cause dazzling of a driver.
The method for determining the intersection point coordinates comprises the following steps: when the light source is a point light source (i.e. the area of the light source is small enough compared with the distance from the light source to the target point, the light source can be regarded as a particle), the coordinate of the intersection point of the light beam emitted from the point light source to the eyes of the driver of the vehicle and the front windshield is calculated, and the intersection point and the partition to which the intersection point belongs are only one.
When the light source is not a point light source, a plurality of luminous points can be selected on the light source, the space coordinates of the luminous points are obtained, and the intersection point coordinates of the light rays emitted by the luminous points to eyes of a driver of the vehicle and the front windshield are calculated respectively. Alternatively, as a further preferable method, the boundary of the light source may be obtained first, and then the boundary may be divided into a plurality of segments (for example, not less than 10 segments) equally, the spatial coordinates of the demarcation points may be obtained respectively, and the coordinates of the intersection point between the light rays emitted from the demarcation points to the eyes of the driver of the vehicle and the front windshield may be calculated. The number of the intersection points corresponding to the light sources is plural, and the number of the partitions to which the intersection points belong is generally plural. It can be seen that the anti-glare method can be adapted to a variety of possible light sources.
After the intersection point coordinates are determined, determining the subareas to which the intersection points belong, and adjusting the current of each subarea between zero and the maximum allowable current intensity, so that the light transmittance of the corresponding subarea is reduced, and the light rays injected into eyes of a driver are not dazzled. For example, E in fig. 3 and 4 is a glare area formed on the front windshield by a beam of strong light emitted from such a light source, and E is a set of partitions occupied by the glare area on the front windshield.
The coordinates of the intersection point need to be calculated by using the coordinates of the spatial position of the front windshield. Since the position of the front windshield on the vehicle body is fixed, a plane equation of the front windshield is generally known. When the eyes of the driver of the vehicle are positioned by adopting the human eye positioning equipment fixed on the vehicle body, the positioning of the front windshield under the same coordinate system can be realized at the same time, and the positioning of the front windshield and the eyes of the driver of the vehicle can be realized by adopting the same set of real-time detection equipment.
As a further preferable technical scheme, the light transmittance of the corresponding subarea is reduced to the extent that the corresponding subarea is just not dazzled, a light transmittance target value is calculated according to the actually measured light intensity of the dazzling light source and a preset light intensity value, a current intensity target value is calculated, a corresponding control instruction is formed according to the current intensity target value, and the corresponding subarea is transmitted to implement the adjustment of the light transmittance. The following method can be adopted: and calculating the light transmittance safety limit value of the corresponding partition according to the ratio of the preset light intensity value to the light intensity of the light source. Selecting a light transmittance target value between zero and the light transmittance safety limit value, and enabling the difference value between the light transmittance safety limit value and the light transmittance target value to be within a set range, namely selecting a light transmittance value which is close to the light transmittance safety limit value but smaller than the light transmittance safety limit value. And then, according to the positive correlation between the light transmittance and the current intensity, obtaining a current intensity target value corresponding to the light transmittance target value, and reducing the current intensity of the corresponding partition to the current intensity target value. The smaller the setting range is, the closer the target value of the light transmittance is to the safety limit value of the light transmittance, and the better the permeability of the corresponding partition is on the premise of ensuring no glare, so that the vehicle front condition can be observed more conveniently.
In the method, only one intersection point exists in one partition at the same time, and only the light intensity of one light source corresponds to the intersection point. However, in practice, it is also possible that the intersection points of a plurality of glare rays on the front windshield belong to one zone, for example, when the light sources are dense or the zone is large, in which case the sum of the intensities of the glare rays corresponding to all the intersection points of the zone can be used as the intensity of the light source used in reducing the light transmittance of the corresponding zone.
The active anti-dazzling method further comprises a control method when the automobile is in a non-driving state, namely, the power supply of all the subareas is turned off, so that all the subareas are in a completely opaque state; or when the maximum value of the light intensity of various light sources in front of the automobile exceeds a set value, the power supply of all the subareas is turned off, so that all the subareas are in a completely opaque state. The automobile interior trim control device can effectively prevent the automobile interior trim from aging caused by strong sun rays injected into the interior of the automobile when the automobile is in a non-driving state.
The partitions are preferably arranged in a matrix of M rows and N columns, where M.gtoreq.1 and N.gtoreq.2 or M.gtoreq.2 and N.gtoreq.1. The more the number of the subareas is M.times.N, the finer the subareas are, which is equivalent to the more pixels on the front windshield, which can independently control the light transmittance, the higher the resolution is, the more accurate the anti-dazzling effect is, and the smoother the dynamic change is.
The light intensity of the light source and the positioning of the light source can be detected in real time by adopting a photosensitive sensor, and can also be realized by adopting a camera, and the positioning of eyes of a driver of the vehicle and a front windshield can be realized by adopting the camera.
An embodiment of the active anti-dazzling method preferably adopts a built-in controller of a vehicle-mounted ADAS system (Advanced Driver Assistant System, advanced driving assistance system) 6 to realize the judgment of whether the light source can cause dazzling to a driver of the vehicle, the calculation of an intersection point coordinate, the determination of a partition to which the intersection point belongs and the adjustment of partition current through a built-in program, adopts a built-in photosensitive sensor of the ADAS system to automatically detect the light intensity of a light source outside the vehicle in real time, converts a light intensity signal into an electric signal, adopts a built-in camera of the ADAS system to automatically position the dazzling light source and eyes of the driver of the vehicle, determines the space coordinate of the dazzling light source, the space coordinate of the eyes of the driver of the vehicle and the space coordinate of a front windshield, and calculates the intersection point coordinate of the dazzling light and the front windshield and determines the partition of the intersection point on the windshield. The built-in controller automatically addresses according to the determined position of the corresponding partition, and transmits a control signal related to the current intensity value to be applied to the corresponding partition of the dimming glass. According to the control signal, the current intensity is reduced, even the power supply is turned off, and the light transmittance of the corresponding subarea is reduced, so that the dazzling light is prevented from stimulating eyes of a driver of the vehicle.
The active anti-glare method may be performed by:
detecting the light intensity of various light sources in front of the automobile;
(II) judging whether the corresponding light source can cause dazzling to the driver of the vehicle according to the light intensity, and if the light source which can cause dazzling to the driver of the vehicle exists, executing the following steps; if no light source which can cause dazzling to the driver of the vehicle exists, further judging the current state of each partition of the dimming glass: returning to the step (I) if the current state of each partition is completely transparent, otherwise, completely transparent each partition by changing the light transmittance of part or all of the partitions;
(III) positioning light sources which can cause dazzling to a driver of the vehicle, and determining space coordinates of the corresponding light sources;
(IV) positioning eyes and a front windshield of a driver of the vehicle, and determining space coordinates of the eyes and the front windshield;
(V) calculating the coordinates of the intersection point of the light rays emitted to eyes by the corresponding light source and the front windshield, and determining the partition to which the corresponding intersection point belongs;
(VI) adjusting the current intensity of the corresponding subarea between zero and the maximum allowable value, and reducing the light transmittance of the corresponding subarea;
(VII) after the automobile is flameout, turning off the power supply of all the subareas so as to enable all the subareas to be in a completely opaque state.
The active anti-dazzling device of the automobile comprises a front windshield, a controller, light source light intensity detection equipment, light source position detection equipment and human eye positioning equipment, wherein the front windshield adopts electric control dimming glass, a liquid crystal film inside the dimming glass is set into a plurality of mutually independent partitions, all the partitions of the dimming glass, the light source light intensity detection equipment, the light source position detection equipment and the human eye positioning equipment are connected with the controller through data, and the on-off power and the current of each partition are controlled by the controller. When and to what extent current adjustment is performed, determining according to a comparison result of the light intensity of the vehicle exterior light source automatically acquired by the light intensity detection device and a preset light intensity value, and determining the intersection point of the dazzling light and the front windshield according to the position of the eyes of the driver automatically acquired by the human eye positioning device, the position of the front windshield and the position of the vehicle exterior dazzling light source acquired by the light source position detection device according to which subarea is adjusted.
The liquid crystal film is compounded into the middle of two layers of glass, and is integrally formed after high-temperature high-pressure gluing. When the dimming glass is powered off or current intensity is reduced, liquid crystal molecules in the dimming glass can be in irregular scattering states with different degrees, and the glass is in a completely opaque state or an intermediate state between the completely transparent state and the completely opaque state; when the maximum allowable current is applied to the dimming glass, the liquid crystal molecules in the dimming glass are orderly arranged, light can freely penetrate, and the dimming glass is in a completely transparent state instantly.
And the dimming glass is provided with a data interface, and each partition of the dimming glass performs data interaction with the controller through the data interface.
The light source light intensity detection device and the light source position detection device are preferably arranged at the central position of the automobile rearview mirror, so that the detection of all light rays entering eyes of a driver is facilitated.
The light source light intensity detection device can adopt a camera and/or a photosensitive sensor, and the light source position detection device can also adopt the camera and/or the photosensitive sensor, so that the detection of the light intensity and the position of the light source can be completed by the same detection device. The human eye positioning device is a camera, preferably a stereo camera.
In one embodiment of the active anti-dazzling device for the automobile, the controller is preferably a built-in controller of a vehicle-mounted ADAS (advanced automatic analysis system), the light source light intensity detection device and the light source position detection device are the same as the built-in light source detection device of the ADAS, the human eye positioning device is the built-in human eye positioning device of the ADAS, the built-in controller comprises a control unit and a storage unit, and the storage unit, the light source light intensity detection device, the light source position detection device and the human eye positioning device are all connected with the control unit. The built-in controller is a control center of the active anti-dazzling device of the automobile, each partition of the front windshield is a controlled object, and a control program is stored in the storage unit and is called by the control unit. The storage unit adopts a large-capacity storage unit, and provides guarantee for real-time detection, calculation and data storage. The light source detection equipment adopts a camera and/or a photosensitive sensor, and the human eye positioning equipment adopts a camera. The light source detection device converts all light rays emitted to human eyes into electric signals, the built-in controller automatically judges whether the light intensity of the light rays is larger than a preset light intensity value, no treatment is usually carried out on the light rays with the light intensity lower than the preset light intensity value under control, and the control unit sends out instructions to adjust the light transmittance of the subareas emitted by the light rays with the light intensity higher than or equal to the preset light intensity value.
The dimming glass can be further provided with a manual power switch for controlling the on and off of all the subareas, and the manual power switch is used for switching on the power supply, so that all the subareas are in a completely transparent state, switching off the power supply, and all the subareas are in a completely opaque state with the lowest light transmittance. When the automobile is stationary, the manual power switch can be turned on as required to observe the front of the automobile.
The working conditions of this embodiment are as follows:
in the running process of the automobile 4 provided with the active anti-glare device, a lot of external strong light can be emitted into eyes 5 of a driver, and the common examples are light rays 1-1 emitted by a head lamp of the automobile 1 running in opposite directions, light rays 1-2 reflected by the ground in rainy days, light rays 2-1 emitted by a road camera 2 and light rays 3-1 emitted by the sun 3 in sunny days. Such light may irritate eyes of a driver and may even cause traffic accidents.
Under the conditions that the vehicle is normally driven and no strong light is incident from the outside, all subareas of the front windshield 7 are in an electrified state, and the front windshield is in a completely transparent state.
When strong light irradiates the front windshield, the photosensitive sensor in the vehicle-mounted ADAS system 6 can automatically acquire an optical signal and convert the optical signal into an electric signal. A control program is arranged in a storage unit in the vehicle-mounted ADAS system, the control unit calls the control program to automatically judge whether the light rays 1-1, 1-2, 2-1 and 3-1 are larger than a preset light intensity value, and if the light rays are lower than the preset light intensity value, the light rays are not processed; if the light intensity is larger than the preset light intensity value, the light transmittance of the front windshield is automatically adjusted.
The sensor acquires the space coordinates of the corresponding light sources 1, 2 and 3 in real time by a camera of the ADAS system according to the light source positions of the light sources 1-1, 1-2, 2-1 and 3-1 with the tracking light intensity larger than the preset light intensity value, the space coordinates of the eyes 5 of the driver and the plane equation of the front windshield, and calculates the intersection point a, b, c, d of the light rays 1-1, 1-2, 2-1 and 3-1 entering the eyes of the driver and the front windshield and the subarea A, B, C, D of the front windshield. The above spatial coordinate transformation and the intersection point calculation algorithm may be implemented by a software program, and the implementation method may be a method known to those skilled in the art.
The control unit in the vehicle-mounted ADAS system adjusts the current intensity of the partition A, B, C, D through an automatic addressing function according to the calculated intersection a, b, c, d and the partition number A, B, C, D thereof, so as to change the light transmittance of the partition A, B, C, D, and prevent the corresponding light rays 1-1, 1-2, 2-1 and 3-1 from dazzling the driver.
When the ambient light intensity is reduced, the control unit will then increase the light transmittance of the sub-area A, B, C, D, and if the light is reduced to no longer glare, the control unit will switch the sub-area A, B, C, D back to a fully transparent state.
Claims (9)
1. An active anti-dazzling method is characterized in that: the method comprises the steps of adopting electric control dimming glass to serve as a front windshield of an automobile, setting a liquid crystal film in the dimming glass into a plurality of mutually independent subareas, controlling each subarea to be in a completely transparent state in an initial state according to the change of current intensity, detecting the light intensity of various light sources in front of the automobile in real time, judging whether the corresponding light sources can cause dazzling to a driver of the automobile according to the light intensity, if the light sources which can cause the dazzling to the driver of the automobile exist, positioning the light sources, determining the space coordinates of the corresponding light sources, positioning eyes of the driver of the automobile and the front windshield, determining the space coordinates of eyes and the front windshield, calculating the intersection point coordinates of the light rays of the eyes of the driver of the automobile, corresponding light sources, corresponding to the corresponding subareas, and determining the subareas to which the corresponding intersection points belong, adjusting the light transmittance of the subareas to reach the non-dazzling degree by adjusting the current of the corresponding subareas, and readjusting the light transmittance of the subarea to the completely transparent state when the light sources which can cause the dazzling to the driver of the automobile, from the existence to the non-existence;
the method for adjusting the light transmittance of the corresponding subarea to enable the light transmitted through the subarea to reach the non-dazzling degree comprises the following steps of: according to the ratio of a preset light intensity value to the light intensity of a light source, calculating a light transmittance safety limit value of a corresponding partition, selecting a light transmittance target value from zero to the light transmittance safety limit value, enabling the difference value between the light transmittance safety limit value and the light transmittance target value to be in a set range, obtaining a current intensity target value corresponding to the light transmittance target value according to the positive correlation between the light transmittance and the current intensity, and reducing the current intensity of the corresponding partition to the current intensity target value.
2. The active anti-glare method of claim 1, wherein: the method for judging whether the corresponding light source can cause dazzling to the driver of the vehicle according to the light intensity comprises the following steps: and comparing the light intensity of various light sources in front of the automobile with a preset light intensity value, if the light intensity of the light source is larger than or equal to the preset light intensity value, judging that the corresponding light source can cause dazzling to a driver of the automobile, otherwise, judging that the corresponding light source cannot cause dazzling to the driver of the automobile, wherein the preset light intensity value is the lowest light intensity value which can cause the driver of the automobile to dazzle when the front windshield is in a completely transparent state.
3. The active anti-glare method of claim 2, wherein: the method for determining the intersection point coordinates comprises the following steps: when the light source is a point light source, calculating the coordinate of an intersection point of the light rays emitted by the point light source to the eyes of the driver of the vehicle and the front windshield, when the light source is not the point light source, obtaining the boundary of the light source, dividing the boundary into a plurality of sections, respectively obtaining the space coordinates of the demarcation points, and calculating the coordinate of the intersection point of the light rays emitted by the demarcation points to the eyes of the driver of the vehicle and the front windshield.
4. The active anti-glare method of claim 1, wherein: when a plurality of intersection points belong to the same partition at the same time, the sum of the light intensities of the light rays corresponding to all the intersection points of the partition is used as the light intensity of the light source used for reducing the light transmittance of the corresponding partition.
5. The active anti-glare method of claim 1, 2, 3, or 4, wherein: when the automobile is in a non-driving state, the power supply of all the subareas is turned off, so that all the subareas are in a completely opaque state; or when the automobile is in a non-driving state, and the maximum value of the light intensity of various light sources in front of the automobile exceeds a set value, the power supply of all the subareas is turned off, so that all the subareas are in a completely opaque state.
6. The active anti-glare method of claim or 5, wherein: the partitions are arranged in a matrix of M rows and N columns, wherein M is more than or equal to 1 and N is more than or equal to 2 or M is more than or equal to 2 and N is more than or equal to 1.
7. The active anti-glare method of claim 6, wherein: the method comprises the steps of detecting light intensity of a light source in real time by adopting a photosensitive sensor and/or a camera, positioning the light source by adopting the photosensitive sensor and/or the camera, positioning eyes of a driver of the vehicle and a front windshield by adopting the camera, judging whether the light source can cause dazzling to the driver of the vehicle or not by adopting a built-in controller of a vehicle-mounted ADAS (advanced automatic analysis system) system, calculating an intersection point coordinate, determining a partition to which the intersection point belongs, and adjusting partition current, wherein the specific implementation mode of the adjustment of the partition current is that the built-in controller automatically addresses according to the determined position of the partition to which the partition current belongs, and transmitting a control signal related to a current intensity value to be applied to the corresponding partition of the light-adjusting glass.
8. An automotive active anti-glare device for implementing the active anti-glare method of any one of claims 1-7, characterized by: including front windshield, controller, light source light intensity check out test set, light source position check out test set and people's eye positioning device, front windshield adopts automatically controlled dimming glass, just the inside liquid crystal film of dimming glass sets to a plurality of mutually independent subregion, each subregion of dimming glass, light source light intensity check out test set, light source position check out test set and people's eye positioning device homoenergetic data connect in the controller, every subregion break-make electricity and current size by the controller control, be provided with data interface on the dimming glass, each subregion of dimming glass pass through data interface with the controller carries out data interaction.
9. The automotive active anti-glare device of claim 8, wherein: the controller adopts the built-in controller of on-vehicle ADAS system, light source light intensity check out test set and light source position check out test set adopt with the built-in light source check out test set of ADAS system, the people's eye locating device adopts the built-in people's eye locating device of ADAS system, built-in controller includes control unit and memory cell, light source light intensity check out test set, light source position check out test set and people's eye locating device all with control unit is connected, light source check out test set adopts camera and/or photosensitive sensor, people's eye locating device adopts the camera.
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