Anti-glare device for vehicle

Abstract

To achieve anti-glare by predicting that sunlight is irradiated to eyes in order to prevent passengers from feeling dazzling even for a moment.SOLUTION: An automatic anti-glare device 21 includes shading adjustment means 31 which is capable of adjusting permeation rate of a window glass provided on a vehicle, photograph sun shade means 32 which acquires sight information in front of the vehicle, vehicle travel information acquisition means 33 which acquires vehicle travel information containing vehicle speed and steering angle, vehicle position information acquisition means 34 which acquires vehicle position information containing present position and direction, clock means 38 which acquires present date information, vehicle position prediction means 35 which finds vehicle prediction position after prescribed time from the sight information and the vehicle travel information and sunshine prediction determination means 36 which finds irradiation state of the sunlight from shadow shade information of road surface contained in the sight information in the vehicle prediction position. The shading adjustment means 31 adjusts permeation rate according to the irradiation state.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a technique for preventing glare caused by sunlight irradiating vehicle occupants. [Background technology]

[0002] Sunlight entering through vehicle windows can be an obstacle to driving and the view, so it is desirable to block the sunlight to reduce the burden on passengers. On the other hand, if the shading mechanism is activated when there is no sunlight entering, it can impede visibility. For this reason, the timing and degree of shading must be appropriate according to the situation at hand.

[0003] Patent document 1 proposes an automatic anti-glare device that identifies the position of a light source and the position of an occupant's eyes, and if it is determined that the occupant's eyes are located in the direction of light from the light source, it operates a physical sun visor to block only the area where light is incident on the occupant's eyes, and if it is determined that the occupant's eyes are not located in the direction of light from the light source, it retracts the sun visor.

[0004] Patent document 2 proposes an anti-glare device for vehicles that is provided with a sun visor that can electrically form a shading section on the inside of the windshield, detects the amount of sunlight irradiated onto the vehicle, the position of the occupants' eyes, and the vehicle's inclination angle, calculates the angle of incidence of the sunlight, and determines whether direct sunlight will enter the occupants' eyes.If the determination is positive, it calculates the parts of the sun visor through which the direct light passes, and forms a shading section only in the relevant passing parts. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-063190 A [Patent Document 2] JP 2002-87060 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, these technologies control the degree of shading when it is determined that direct sunlight is entering at that time in response to the vehicle angle, which changes from moment to moment, so there is an unavoidable time lag, and sunlight is exposed to the eyes of passengers for a short period of time until the light can be blocked.

[0007] Therefore, an object of the present invention is to realize an anti-glare function by predicting that sunlight will be irradiated onto the eyes, so that passengers will not feel dazzled even for a moment. [Means for solving the problem]

[0008] The present invention relates to A light-shielding adjustment means capable of adjusting the transmittance of a window glass provided in a vehicle; A sun-shade photographing means for acquiring information on a view ahead of the vehicle; A vehicle driving information acquisition means for acquiring vehicle driving information including a vehicle speed and a steering angle; a vehicle position prediction means for determining a predicted vehicle position after a predetermined time from the scene information and the vehicle driving information; a sunshine prediction determination means for determining a state of sunlight irradiation from road surface shade information included in the scene information at the predicted vehicle position; having The above-mentioned problems are solved by a first solving means which is an automatic anti-glare device, in which the light blocking adjustment means adjusts the transmittance of the window glass in accordance with the irradiation conditions.

[0009] In addition to the first solving means, the automatic anti-glare device according to the present invention has the following features: The shading adjustment means can adopt a second solution means, which adjusts the transmittance of the window glass to be lower than a predetermined value when the sunshine prediction determination means determines that the sunlight irradiation conditions at the predicted vehicle position are in the sun, and adjusts the transmittance of the window glass to be higher than the predetermined value when the sunshine prediction determination means determines that the sunlight irradiation conditions at the predicted vehicle position are in the shade.

[0010] In addition to the first or second solving means, the automatic anti-glare device according to the present invention has the following features: a vehicle position information acquisition means for acquiring vehicle position information including a current position and a direction; A clock means for acquiring current date and time information; and A third solution can be adopted in which the predicted vehicle position is a corrected predicted position shifted to the side opposite the sun based on the passenger's eye level and the solar altitude calculated from the vehicle position information and current date and time information.

[0011] In addition to any one of the first to third solving means, the automatic anti-glare device according to the present invention has the following features: a shade determining means for determining whether or not the shade information on the road surface corresponds to an oncoming vehicle or a preceding vehicle based on the scene information; The shading adjustment means can adopt a fourth solution means, which adjusts the transmittance of the window glass to show sunlight when the shade-shade determination means determines that the shade at the predicted vehicle position is due to the shadow of an oncoming vehicle or a preceding vehicle, even if the sunlight irradiation situation at the predicted vehicle position is in the shade.

[0012] In addition to the first to fourth solving means, the automatic anti-glare device according to the present invention has the following features: the window glass comprises a windshield; a sun direction determination means for determining whether the sun is positioned ahead based on the vehicle position information and the current date and time information, A fifth solution can be adopted, in which the shading adjustment means adjusts the transmittance of the window glass only when the sun is positioned forward. Effect of the Invention

[0013] According to the automatic anti-glare device of this invention, whether the vehicle will be in the sun or shade after a certain time is obtained in advance from the scene information, so that the shading can be performed in advance before the vehicle actually enters the sun, and the problem of glare during the time lag, which was a conventional problem, is solved. Specifically, by obtaining the predicted vehicle position at a future time for a time longer than the response time for switching from transmission to shading in the shading adjustment means, the shading adjustment means can make adjustments in sufficient time. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a conceptual diagram showing an embodiment of a vehicle equipped with an automatic anti-glare device according to the present invention and the surrounding conditions; [Diagram 2] FIG. 1 is a functional block diagram showing an embodiment of an automatic anti-glare device according to the present invention; [Diagram 3] FIG. 13 is an example of a vehicle predicted position predicted by a vehicle position prediction means from a passenger's viewpoint; [Figure 4] An example of scene information recognized by the forward camera and the corrected predicted position [Diagram 5] A diagram showing the difference between sunshine and shade depending on eye level [Figure 6] Schematic diagram of corrected predicted position [Figure 7] FIG. 1 is a flow chart showing an example of the automatic anti-glare device according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] FIG. 1 shows a conceptual diagram of an embodiment of a vehicle equipped with an automatic anti-glare device according to the present invention. A passenger D is riding in the vehicle 10 and is looking ahead through the windshield 11. A forward camera 15 is provided in front of the vehicle 10, and can acquire information on the view ahead. There are shading objects B, such as clouds in the sky, trees and buildings standing near the road, and light from the sun S may be blocked by these shading objects B. At least a part of the upper part of the windshield 11 of the vehicle's window glass is provided with a light control unit 12 that can adjust the transmittance of light rays. The door glass may also be provided with a light control unit 12, and the automatic anti-glare device 21 according to the present invention may be applied to the door glass. The most important part is the windshield 11, and it is necessary that the light control unit 12 is provided on the side where the driver is located, so that the sunlight entering the eyes of the passenger D, who is the driver, can be adjusted. The automatic anti-glare device of the present invention determines in advance a predetermined time whether the vehicle is traveling in the sun or in the shade, and proactively switches the dimming section 12 between blocking or transmitting light when the vehicle passes after the predetermined time.

[0016] A functional block diagram of an automatic anti-glare device 21 according to the present invention is shown in FIG. Window glass including the windshield 11 is provided with a shading adjustment unit 12 capable of adjusting the degree of transmittance, and can be switched between shading and transmission by a shading adjustment means 31 possessed by the automatic anti-glare device 21. The shading adjustment means 31 may be realized as software by a general-purpose Electronic Control Unit (ECU) possessed by the vehicle, or a dedicated shading ECU may be provided and operate as the shading adjustment means 31.

[0017] The automatic anti-glare device 21 has a sun shooting means 32 that acquires information on the view ahead of the vehicle from the front camera 15 attached to the vehicle 10. It is desirable that this sun shooting means 32 be able to continuously acquire the view information as video information so that processing can be performed continuously while driving. The front camera 15 and the sun shooting means 32 may be dedicated devices fixedly attached to the vehicle 10, or the front camera 15 and the sun shooting means 32 may be installed in a general-purpose device such as a camera-equipped smartphone or tablet with a dedicated app installed so that the image can be output externally.

[0018] The automatic anti-glare device 21 has a vehicle driving information acquisition means 33 that acquires vehicle driving information including the vehicle speed and steering angle. It is desirable that the vehicle speed and steering angle can be acquired from a basic control mechanism of the vehicle 10. In that case, a general-purpose ECU serves as the vehicle driving information acquisition means 33.

[0019] The automatic anti-glare device 21 has a vehicle position information acquisition means 34 that acquires vehicle position information including the current position and direction. Here, the current position is latitude and longitude, and must have a degree of accuracy required to determine the solar altitude. Specifically, the device has an antenna compatible with a satellite positioning system such as GPS (Global Positioning System) as hardware, and determines the current position from this antenna. It is also preferable that the direction can be acquired from hardware such as an electronic compass.

[0020] The automatic anti-glare device 21 has clock means 38 that acquires the current date and time. Here, the current date and time needs to be a time with sufficient accuracy to execute the vehicle position information acquisition means 34, and it is desirable that it corresponds to standard time. Specifically, it may have a radio-controlled clock as hardware, or may have a clock function that can access and synchronize with a time server on the Internet.

[0021] The vehicle position information acquisition means 34 and the clock means 38 are shown as separate units in FIG. 2, but the embodiment is not limited to this, and the hardware may be managed collectively by a single IVI (In-Vehicle Infotainment) device possessed by the vehicle 10.

[0022] The automatic anti-glare device 21 has a vehicle position prediction means 35 that calculates the predicted vehicle position after a predetermined time from the road surface shadow information included in the scene information obtained from the sun shadow photographing means 32 and the vehicle driving information obtained from the vehicle driving information acquisition means 33. The scene information includes information on the road ahead. The distance traveled after a predetermined time can be calculated from the vehicle speed, and the location that is that distance away in the direction according to the current steering angle is the predicted vehicle position where the vehicle 10 is expected to reach after the predetermined time. An example of this situation is shown in Figures 3 and 4. Figure 3 shows the field of view as seen by the passenger D, and Figure 4 shows scene information as seen from the front camera. The steering angle is close to 0 degrees, and the vehicle is driving facing forward, and the location that is a distance away according to the vehicle speed (the area enclosed by the dashed line in the figure) is the predicted vehicle position A where the vehicle is expected to reach after the predetermined time.

[0023] Here, the predetermined time is the time required for the light control unit 12 to be changed by the light blocking adjustment means 31. It is the time required for the information processing by the ECU, the transmission via the communication interface, and the information reaching the light control unit 12 to specifically deform the light control unit 12 and change the transmittance. For example, when the time lag from the execution of the vehicle position prediction means 35 to the final adjustment of the light control unit 12 corresponding thereto is 0.8 seconds, it is desirable to secure a longer predetermined time of about 1.0 seconds for this predetermined time. A default value for this predetermined time is recorded in an on-board storage device (not shown) according to the vehicle model and the characteristics of the light control unit 12, and it is desirable to use this value.

[0024] In addition, depending on the hardware characteristics of the light control unit 12, the time required for processing may differ between switching from light blocking to light transmission and switching from light transmission to light blocking. In such a case, it is desirable to set the above-mentioned predetermined time based on the time required for processing. If the response times are too different, such as the time required for processing between switching from light blocking to light transmission and switching from light transmission to light blocking being more than twice as long, the above-mentioned predetermined time may be set differently depending on whether the light control unit 12 is currently in light transmission or light blocking mode.

[0025] The automatic anti-glare device 21 has a sunshine prediction determination means 36 that determines the sunlight irradiation conditions from the road surface shade information included in the scene information at the predicted vehicle position A. Specifically, the sunshine prediction determination means 36 obtains the shade information of the road surface at the predicted vehicle position A from the scene information. Here, the shade information needs to include information that allows the brightness in the visible light range to be determined at least. From the brightness, the sunshine prediction determination means 36 determines the irradiation conditions, which are whether or not sunlight is irradiating, that is, whether it is in the sunshine or in the shade. More specifically, if sunlight is irradiating somewhere at the predicted vehicle position A, the sunshine prediction determination means 36 determines that it is in the sunshine, and if sunlight is not irradiating anywhere at the predicted vehicle position A, the sunshine prediction determination means 36 determines that it is in the shade.

[0026] The location that is away in the direction indicated by the steering angle by the distance multiplied by the vehicle speed for the specified time as described above is the vehicle predicted position A. More specifically, it is preferable to determine the vehicle predicted position A based on the shade information of the range of a specified angle of view toward the vehicle predicted position A among the view information of the entire view captured by the front camera 15. The vehicle predicted position A used for the determination by the sunshine prediction determination means 36 may be specified as a point where the passenger D is predicted to be present after a specified time, but it is practically preferable to specify the range where the vehicle 10 is predicted to be present. If even a part of the vehicle predicted position A specified as a range is bright enough to be determined as sunny, it is preferable to determine it as sunny. For example, if the light blocking object B is a tree or the like that has a hole and sunlight shines through the trees, the passenger D will feel dazzled even with a small amount of light. Also, if the vehicle passes through a place with a lot of sunlight, the number of times switching between sunny and shade will be enormous, making processing difficult.

[0027] When the sunshine prediction determination means 36 determines that the illumination condition of the sunlight at the vehicle predicted position A is in the sun, the shading adjustment means 31 adjusts the transmittance of the corresponding portion of the light control unit 12 of the window glass to be lower than a predetermined value. On the other hand, when the vehicle is determined to be in the shade, the shading adjustment means 31 adjusts the transmittance of the corresponding portion of the light control unit 12 of the window glass to be higher than a predetermined value. That is, the transmittance is lowered if the vehicle is in the sun, and higher if the vehicle is in the shade. It takes a little time for such an adjustment to be reflected in the actual transmittance, but since the adjustment is made by referring to the illumination information of the vehicle predicted position A where the vehicle 10 will arrive a predetermined time in the future that is longer than that time, anti-glare can be performed without a time lag. As a specific value of the predetermined value, for example, if the transmittance is set to 20% or less if the vehicle is determined to be in the sun, and the transmittance is set to 40% or more if the vehicle is determined to be in the shade, practical anti-glare can be achieved in a general environment. This value may be set by default, or may be set by the occupant D individually via an in-vehicle interface such as a touch panel to a storage device (not shown) of the vehicle ECU.

[0028] The anti-glare adjustment by the automatic anti-glare device 21 is constantly adjusted in response to the changing scene information while driving. When the transmittance of the light control unit 12 is being adjusted, a judgment is made based on the scene information at the next point in time, and by continuing to make adjustments as needed, continuous anti-glare while driving can be achieved.

[0029] In addition, in the automatic anti-glare device 21, if the vehicle predicted position A determined by the sunshine prediction determination means 36 is set to a corrected predicted position Aa that is shifted to the opposite side of the sun based on the passenger's eye height h and the solar altitude θ calculated from the vehicle position information and the current date and time information, an even more accurate anti-glare can be achieved. A situation in which this position correction is effective will be described with reference to FIG. 5. Depending on the type of vehicle 10, the eye height h of the passenger D is about 1 meter above the road surface, and even if the road surface on which the vehicle is located is in the shade due to being in the shadow of a light blocking object B, the area around the face of the passenger D, which is located higher than that, may be in the sun. Of course, the opposite may also be true. Correspondingly, when the vehicle 10 reaches the vehicle predicted position A, the position of the road surface on which the sunlight passing through the eyes of the passenger D hits will be shifted to the opposite side of the sun from the vehicle predicted position A by a correction distance r = eye height h / tan θ (θ: solar altitude). This positional relationship is shown in FIG. 6. Therefore, if the position where the judgment is made as to whether it is in the sun or in the shade is corrected to this shifted position, anti-glare with even higher accuracy can be realized. In the situation shown in Fig. 4, the predicted vehicle position A is in the shade, but the corrected predicted position Aa corrected by the correction distance r is in the sun, so that it is predicted that the face of the passenger D will be in the sun after a predetermined time. Therefore, the shading adjustment means 31 of the automatic anti-glare device 21 adjusts the transmittance to a low level so as to shade the light control unit 12. The solar altitude θ and the direction of the sun can be calculated from the latitude, longitude and direction of the vehicle obtained by the vehicle position information acquisition means 34 and the date and time information obtained by the clock means 38.

[0030] The eye level h may be set as a default value according to the type of vehicle 10 being driven, or may be a value that the occupant D can individually specify via an in-vehicle interface such as a touch panel to a memory device (not shown) possessed by the vehicle's ECU.

[0031] The correction to the corrected predicted position Aa may be performed at the stage when the vehicle position prediction means 35 outputs the signal, or at the stage when the sunshine prediction determination means 36 uses the signal, or by executing a program separately from these. However, since the adjustment is performed at any time, it is desirable to reduce the load and perform the process together with other processes.

[0032] In addition, it is preferable that the automatic anti-glare device 21 has a shade / shadow determination means 39 that analyzes the scene information and determines whether the shade / shadow information on the road surface corresponds to an oncoming vehicle C or a preceding vehicle. Some current ECUs have an image recognition function that distinguishes a moving vehicle from scene information for an automatic brake function or the like. This image recognition function is expanded to enable image recognition of whether a shade is moving with a vehicle. In addition, even if the sunlight irradiation situation at the vehicle predicted position A (corrected predicted position Aa) is a shade, if it is determined that the shade is due to the shadow of an oncoming vehicle or a preceding vehicle, the shading adjustment means 31 is executed as a sunny spot. This is because even if the vehicle predicted position A (corrected predicted position Aa) is a shade, if the shade is due to an oncoming vehicle or a preceding vehicle, the oncoming vehicle C or the preceding vehicle will be in the sun the next moment it moves. However, this is premised on the fact that the area around the vehicle's shadow is in the sun. By executing the shading adjustment means 31 in this way, it is possible to avoid malfunctions due to the shadow of an oncoming vehicle or a preceding vehicle. For example, the shadow K of the oncoming vehicle C in Figures 3 and 4 falls on the lane in which the vehicle is traveling. However, since this shadow K passes by together with the oncoming vehicle C, even if the shadow of the oncoming vehicle C is judged to be a shade, it is better to judge it to be a shade if the surrounding area is sunny.

[0033] Moreover, the automatic anti-glare device 21 has a sun direction determination means 40 that determines whether the sun is located in front based on the vehicle position information and the current date and time information, and it is desirable to execute the shading adjustment means 31 only when the sun is located in front of the vehicle 10, since this avoids unnecessary processing and erroneous operation. When the sun is located behind the vehicle, sunlight is unlikely to enter the eyes of the passenger D through the windshield, and there is no possibility that the passenger D will feel dazzled by the sunlight at night. Here, the front may be a range of 180 degrees in total, spanning 90 degrees to the left and right of the front, but when adjusting the light for the windshield light adjustment unit 12, it may be a more limited range that can be within the angle between the front pillar (A pillar) 13 from the viewpoint of the passenger D sitting in the driver's seat or passenger seat. In this case, it is sufficient to adjust the transmittance only when the sun is located in a range of 160 degrees to 180 degrees forward according to the arrangement of the vehicle.

[0034] A specific procedure for realizing automatic anti-glare in a vehicle 10 equipped with an automatic anti-glare device according to the present invention will be described with reference to a flow example in Fig. 7. This process is repeated from when the vehicle starts traveling until the vehicle stops traveling. First (S101), the vehicle travel information acquisition means 33 is executed to acquire vehicle travel information including vehicle speed and steering angle, the vehicle position information acquisition means 34 is executed to acquire vehicle position information including current position and direction, and the clock means 38 is executed to acquire date and time information (S102).

[0035] Next, the sun direction determination means 40 is executed to determine whether or not the sun is present in the traveling direction (forward) of the vehicle 10 (S103). If there is no sun ahead (S103→No), the light control unit 12 is made transparent (S110). Note that nighttime is also included as a case where there is no sun ahead. On the other hand, if there is the sun ahead (S103→Yes), information is continuously acquired and a determination is made.

[0036] The sun shooting means 32 is executed to obtain forward view information captured by the forward camera 15 (S104). The vehicle position prediction means 35 is executed to specify a predicted vehicle position A after a predetermined time on the road surface captured in this view information from the already obtained vehicle speed and steering angle (S105). Furthermore, as an additional process of the vehicle position prediction means 35, this predicted vehicle position A is corrected to a corrected predicted position Aa obtained by shifting the road surface range used in the subsequent judgment to the opposite side of the sun by a correction distance r = eye height h / tan θ (θ: solar altitude) from the eye height h of the passenger D and the solar altitude θ (S106). Note that the vehicle may deviate from the road surface.

[0037] Then, the sunshine prediction determination means 36 is executed to determine whether the range of the corrected predicted position Aa is a sunny spot where sunlight is irradiated (S107). If the range of the corrected predicted position Aa is a sunny spot (S107→Yes), the shading adjustment means 31 adjusts the transmittance of the windshield light control unit 12 to be low (S109). If the range of the corrected predicted position Aa is in the shade (S107→No), the shade / shadow determination means 39 determines whether the shade is caused by a shadow K of another vehicle such as an oncoming vehicle C (S108). If the shade is caused by the shadow of another vehicle (S108→Yes), it is determined that the area is in the sun, and the shading adjustment means 31 adjusts the transmittance of the windshield light control unit 12 to be low so as to shade the area (S109). If the shadow is not caused by the shadow K of another vehicle (S108→No), it can be determined that the light is not hitting the face of the passenger D, and the shading adjustment means 31 adjusts the transmittance to be high so that the light passes through the windshield light control section 12 (S110). This completes one round of judgment (S111). By continuously carrying out this process while driving, it is possible to automatically and continuously prevent the passenger D from feeling dazzled, and provide a safe driving environment.

[0038] The vehicle 10 equipped with the automatic anti-glare device 21 may be an engine vehicle, a hybrid vehicle having an engine, or an electric vehicle. In the case of a hybrid vehicle, the vehicle may be a plug-in hybrid vehicle (PHEV) that can be connected to an external power supply station (external power source) and supply power to the secondary battery, in addition to being charged by the power generated by the engine. The secondary battery may be capable of supplying power to the outside. In other words, the type of vehicle equipped with the automatic anti-glare device 21 is not particularly limited. A general-purpose ECU possessed by these vehicles may take on part of each of the above means, or a dedicated ECU may be used to realize the above means. In addition, the front camera 15 may be used in common with existing vehicle equipment such as a drive recorder. Furthermore, the vehicle identification function used by the shade / shadow determination means 39 may be an identification function for automatic driving or automatic braking.

[0039] The image recognition means used in the sunshine prediction determination means 36 and the shade determination means 39 can be general image recognition means, and may be realized by artificial intelligence such as deep learning, or may be based on other programs as long as they have equivalent or greater discrimination ability, and are not particularly limited. [Explanation of symbols]

[0040] 10 Vehicles 11. Windshield 12 Dimming section 13 Front pillar 15 Front Camera 21 Auto-dimming device 31 Shading adjustment means 32 Means of Shooting Shadows 33 Vehicle driving information acquisition means 34 Vehicle position information acquisition means 35 Vehicle position prediction means 36 Means for determining sunshine forecast 38 Clock Means 39 Shade / Shadow Judgment Means 40 Sun direction determination means A Vehicle predicted position Aa Corrected predicted position B Light shielding object C Oncoming vehicle D. Passenger K shadow h Eye level r Correction distance S sun θ Sun altitude

Claims

1. A light-shielding adjustment means capable of adjusting the transmittance of a window glass provided in a vehicle; A sun-shade photographing means for acquiring information on a view ahead of the vehicle; A vehicle driving information acquisition means for acquiring vehicle driving information including a vehicle speed and a steering angle; a vehicle position prediction means for determining a predicted vehicle position after a predetermined time from the scene information and the vehicle driving information; a sunshine prediction determination means for determining a state of sunlight irradiation from road surface shade information included in the scene information at the predicted vehicle position; having The light blocking adjustment means adjusts the transmittance of the window glass according to the illumination conditions, thereby forming an automatic anti-glare device.

2. 2. The automatic anti-glare device according to claim 1, wherein the shading adjustment means adjusts the transmittance of the window glass to be lower than a predetermined value when the sunshine prediction determination means determines that the sunlight irradiation conditions at the predicted vehicle position are in the sun, and adjusts the transmittance of the window glass to be higher than the predetermined value when the sunshine prediction determination means determines that the sunlight irradiation conditions at the predicted vehicle position are in the shade.

3. a vehicle position information acquisition means for acquiring vehicle position information including a current position and a direction; A clock means for acquiring current date and time information; and 2. The automatic anti-glare device according to claim 1, wherein the predicted vehicle position is a corrected predicted position shifted to the side opposite the sun based on the passenger's eye level and the solar altitude calculated from the vehicle position information and current date and time information.

4. a shade determining means for determining whether or not the shade information on the road surface corresponds to an oncoming vehicle or a preceding vehicle based on the scene information; 2. The automatic anti-glare device according to claim 1, wherein the shading adjustment means adjusts the transmittance of the window glass as if it were in the sun even if the sunlight irradiation condition at the predicted vehicle position is in the shade, when the shade-shade determination means determines that the shade at the predicted vehicle position is due to the shadow of an oncoming vehicle or a preceding vehicle.

5. the window glass comprises a windshield; a sun direction determination means for determining whether the sun is positioned ahead based on the vehicle position information and the current date and time information, 2. The automatic anti-glare device according to claim 1, wherein the shading adjustment means adjusts the transmittance of the window glass when the sun is positioned in front of the vehicle.

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