CN111688570A - Vehicle headlamp and control method for vehicle headlamp - Google Patents
Vehicle headlamp and control method for vehicle headlamp Download PDFInfo
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- CN111688570A CN111688570A CN202010169380.7A CN202010169380A CN111688570A CN 111688570 A CN111688570 A CN 111688570A CN 202010169380 A CN202010169380 A CN 202010169380A CN 111688570 A CN111688570 A CN 111688570A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
- B60Q1/1415—Dimming circuits
- B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
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- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Provided are a vehicle headlamp and a control method for the vehicle headlamp, wherein glare to pedestrians and vehicles ahead can be reduced without providing a special detection means for detecting pedestrians, and forward visibility can be ensured. A vehicle headlamp is provided with: the vehicle-mounted display device includes a low-beam irradiation unit for irradiating light only to a lower irradiation region (61, 71) below a cutoff line, an additional high-beam irradiation unit for irradiating light to a far irradiation region above a selected irradiation region, and a control unit for controlling the low-beam irradiation unit, the ADB irradiation unit, and the additional high-beam irradiation unit to emit light, based on position information indicating a position of a vehicle traveling ahead and traveling speed information indicating a vehicle speed of the vehicle, wherein an upper end of the selected irradiation region (72) is in a range of 0.7 to 1.5 degrees upward from a horizontal direction.
Description
Technical Field
The present invention relates to a vehicle headlamp provided in a front surface of a vehicle body and a method of controlling the vehicle headlamp, and more particularly to a vehicle headlamp using a light distribution variable high beam technique and a method of controlling the vehicle headlamp.
Background
Heretofore, the following vehicle headlamps have been proposed: a light emitting element array including a plurality of semiconductor light emitting elements is provided, and a light distribution variable high Beam (ADB) technique is used, which can irradiate a plurality of irradiation regions divided in the left-right direction above a horizontal line (for example, see patent document 1). In the vehicle headlamp using the ADB technology, the light emitting element array is controlled so as not to irradiate the region corresponding to the position of the front vehicle, by detecting the front vehicle such as the preceding vehicle or the oncoming vehicle, thereby preventing glare from being given to the driver of the front vehicle.
In the headlamps using the ADB technique, the front of the vehicle is photographed by an image pickup device, the headlamps and the rear lamps of the front vehicle are identified by an image, and the area corresponding to the front vehicle is not irradiated with light from the light emitting element array. In addition, the driver of the vehicle can easily visually recognize the pedestrian by selectively irradiating the area where the vehicle ahead is not present with the high beam. In this way, the ADB technique improves the forward visibility during night driving without giving glare to the driver of the preceding vehicle.
Fig. 8 is a diagram schematically showing irradiation of light using the conventional ADB technique. Low beam and high beam 2 are emitted forward from a headlight 1a of the vehicle 1. In fig. 8, the irradiation range of the low beam is not shown. The pedestrians 3a to 3g shown in the figure are present at equal intervals, for example, at an interval of about 10m from the vehicle 1.
As shown in fig. 8, in the conventional ADB technique, the high beam 2 is irradiated to a position about 4.0 to 8.0 degrees above the horizontal, and thus the light can be irradiated to a high position from the vicinity of the vehicle 1 to the far side. On the other hand, pedestrians 3a to 3g located in front of the vehicle 1 are all irradiated with the high beam 2 to the height of the face. In particular, since pedestrians 3a to 3c located 10 to 30m ahead of the vehicle 1 are located near the vehicle 1, the light irradiated from the high beam 2 to the height of the upper body and the face is strong, and strong glare is given to the pedestrians 3a to 3c located near the vehicle 1.
However, even if it is intended to prevent dazzling of the pedestrians 3a to 3g in the same manner as in the preceding vehicle, since the pedestrians 3a to 3g do not emit light by themselves and the visibility greatly changes due to clothing and the surrounding environment, it is difficult to perform detection by image recognition in the same manner as in the preceding vehicle. For example, a method of irradiating infrared rays to the front of the vehicle 1 and capturing an infrared image is conceivable for detecting the pedestrians 3a to 3g, but it is difficult to reliably recognize only the pedestrians 3a to 3g from various surrounding environments. In addition, since the recognition of the preceding vehicle requires the use of an infrared irradiation device and an infrared camera separately, the number of components and the weight of the vehicle increase.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2013-168434
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a vehicle headlamp and a control method of the vehicle headlamp, which can reduce glare on pedestrians and front vehicles without providing a special detection mechanism for detecting pedestrians, and can ensure front visibility.
Means for solving the problems
In order to solve the above problem, a vehicle headlamp according to the present invention includes: a low beam irradiation unit that irradiates light to a lower irradiation region below the cutoff line; an ADB irradiation unit that selectively irradiates light to a selective irradiation region above the cutoff line; an additional high beam irradiation unit for irradiating a far irradiation region above the selected irradiation region with light; and a control unit that controls the light emission of the low beam irradiation unit, the ADB irradiation unit, and the additional high beam irradiation unit based on position information indicating a position of a preceding vehicle that is traveling ahead and traveling speed information indicating a vehicle speed of the vehicle, wherein an upper end of the selective irradiation area is in a range of 0.7 to 1.5 degrees upward from a horizontal direction.
In the vehicle headlamp of the present invention, since the upper end of the light emitted from the ADB illuminating unit is in the range of 0.7 to 1.5 degrees upward from the horizontal direction, the light from the ADB illuminating unit is not emitted to the head of the pedestrian in the vicinity of the vehicle, and the glare on the pedestrian and the front vehicle can be reduced without providing a special detecting means for detecting the pedestrian, and the front visibility can be ensured.
In one aspect of the present invention, the control unit controls the additional high beam irradiation unit to be turned off and the ADB irradiation unit to be turned on when the traveling speed information is equal to or higher than a first speed and is less than a second speed, and controls the additional high beam irradiation unit to be turned on when the traveling speed information is equal to or higher than the second speed and the position information does not include a preceding vehicle.
In one aspect of the present invention, the control unit turns off the additional high beam irradiation unit when the traveling speed information is equal to or higher than the second speed and the position information includes a preceding vehicle.
In one aspect of the present invention, the control unit turns on the low beam irradiation unit regardless of the presence or absence of the front vehicle and the traveling speed information in the position information.
In one aspect of the present invention, the ADB irradiation unit includes a left ADB unit that irradiates light to the left side from the center of the vehicle and a right ADB unit that irradiates light to the right side, and one of the left ADB unit and the right ADB unit on a side close to the opposite lane has a wider irradiation range of light than the other.
In order to solve the above problem, a method for controlling a vehicle headlamp according to the present invention includes: a low beam irradiation unit that irradiates light to a lower irradiation region below the cutoff line; an ADB irradiation unit that selectively irradiates light to a selective irradiation region above the cutoff line; and an additional high beam irradiation unit that irradiates light above the selective irradiation region, wherein an upper end of the selective irradiation region is in a range of 0.7 to 1.5 degrees upward from a horizontal direction, and the method for controlling the vehicle headlamp includes: a position information acquisition step of acquiring position information indicating a position of a preceding vehicle existing ahead while traveling; a speed measurement step of measuring traveling speed information of the vehicle; and a determination step of determining light emission of the low beam irradiation unit, the ADB irradiation unit, and the additional high beam irradiation unit based on the position information and the traveling speed information, wherein in the determination step, when the traveling speed information is a first speed or more and less than a second speed, the ADB irradiation unit is turned on while the additional high beam irradiation unit is turned off.
Effects of the invention
In the present invention, it is possible to provide a vehicle headlamp and a control method of a vehicle headlamp that can reduce glare on pedestrians and vehicles ahead without providing a special detection mechanism for detecting pedestrians and can ensure forward visibility.
Drawings
Fig. 1 is a block diagram schematically showing a configuration of a vehicle headlamp 100 according to a first embodiment.
Fig. 2 is a diagram schematically showing the lighting control of the low beam irradiation units 41, 51, the ADB irradiation units 42, 52, and the additional high beam irradiation units 43, 53 in the first embodiment.
Fig. 3 (a) to (d) are diagrams schematically showing light distribution in each case shown in fig. 2 (a) to (d).
Fig. 4 is a schematic diagram illustrating light irradiation and glare prevention from the ADB irradiation parts 42 and 52 to the selected irradiation region 72.
Fig. 5 is a diagram schematically showing an example of arrangement of the ADB irradiation units 42 and 52 and the additional high beam irradiation units 43 and 53 in the second embodiment.
Fig. 6 is a diagram schematically showing the light distribution by the left-side high beam unit LH and the right-side high beam unit RH in the second embodiment.
Fig. 7 is a graph showing an example of the horizontal direction angle of light emitted from each light emitting diode of the ADB irradiation units 42 and 52 in the second embodiment, in which fig. 7 (a) shows a left selective irradiation region 72L, and fig. 7 (b) shows a right selective irradiation region 72R.
Fig. 8 is a diagram schematically showing irradiation of light using the conventional ADB technique.
Description of the reference numerals
1 … vehicle
1a … headlamp
2 … high beam
3 a-3 g … pedestrian
100 … vehicle headlight
10 … camera
20 … speedometer
30 … control part
40 … left side head lamp
50 … Right side head lamp
41. 51 … low beam irradiation part
42. 52 … ADB irradiation part
43. 53 … additional high beam irradiation part
61 … road surface
62 … pedestrian
63 … front vehicle
71 … lower irradiation region
72 … selecting an irradiation region
72L … left side selection illumination area
72R … right side selection irradiation area
73 … remote irradiation area
Detailed Description
(first embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent constituent elements, members, and processes shown in the respective drawings are denoted by the same reference numerals, and overlapping descriptions are appropriately omitted. Fig. 1 is a block diagram schematically showing the configuration of a vehicle headlamp 100 according to the present embodiment. The vehicle headlamp 100 includes a control unit 30, a left headlamp 40, and a right headlamp 50. The camera 10 and the speedometer 20 are connected to the control unit 30, and signals can be communicated between the camera 10 and the speedometer 20. The left headlamp 40 and the right headlamp 50 are provided with low beam irradiation portions 41 and 51, ADB irradiation portions 42 and 52, and additional high beam irradiation portions 43 and 53, respectively.
The camera 10 is a device that is attached to the front of the vehicle and captures a front image of the front of the vehicle. The structure of the camera 10 is not limited, and a known structure such as a general CCD (Charge Coupled Device) or cmos (complementary mos) can be used. The image captured by the camera 10 may be a color image or a monochrome image. The camera 10 is connected to the control unit 30 so as to be capable of communicating information, and transmits a front image captured by the camera 10 to the control unit 30. The connection between the camera 10 and the control unit 30 may be a wired connection or a wireless connection. Here, the camera 10 is shown as a mechanism for acquiring information in front of the vehicle, but a laser radar, a millimeter wave radar, a lidar (light Detection and ranging), or the like may be used.
The speedometer 20 is a device that measures travel speed information of the vehicle. The specific configuration of the speedometer 20 is not limited, and may be used in combination with a device provided in the vehicle in advance, or may be used separately from a dedicated device. The speedometer 20 is connected to the control unit 30 in an information-communicating manner, and transmits the traveling speed information measured by the speedometer 20 to the control unit 30. The connection between the speedometer 20 and the control unit 30 may be a wired connection or a wireless connection.
The control unit 30 is an information processing means that is connected to the camera 10 and the speedometer 20 so as to be able to communicate information, and is electrically connected to the left headlamp 40 and the right headlamp 50. The control unit 30 acquires position information of a preceding vehicle such as a preceding vehicle and an oncoming vehicle from a front image from the camera 10 by image recognition, and performs lighting control of each part of the left headlamp 40 and each part of the right headlamp 50 based on the position information and traveling speed information of the preceding vehicle, thereby executing a control method of the vehicle headlamp. The method of recognizing the position information of the preceding vehicle from the preceding image is not limited, and a known technique such as a method of extracting light from a tail lamp of the preceding vehicle or a headlight of the oncoming vehicle can be used. The specific configuration of the control unit 30 is not limited, and a cpu (central processing unit), an ic (integrated circuit), an soc (system on chip), or the like can be used. In addition, a known configuration such as an external storage device or a program may be provided.
The left headlamp 40 is a device that is disposed on the left front side of the vehicle and irradiates light to the front of the vehicle, and includes a low beam irradiation unit 41, an ADB irradiation unit 42, and an additional high beam irradiation unit 43. The right headlamp 50 is a device that is disposed on the right front side of the vehicle and irradiates light to the front of the vehicle, and includes a low beam irradiation portion 51, an ADB irradiation portion 52, and an additional high beam irradiation portion 53. In a country where the vehicle is traveling on the left side of the lane, the right side of the vehicle is an oncoming traffic passing region and the left side is a pedestrian passing region, so the left headlamp 40 is a pedestrian-side headlamp and the right headlamp 50 is an oncoming side headlamp. In a country where the vehicle is traveling on the right side of the lane, the left headlamp 40 is an oncoming side headlamp, and the right headlamp 50 is a pedestrian side headlamp.
The low beam irradiation portions 41 and 51 are each an illumination device that irradiates light only in a lower irradiation region below the cutoff line. The low beam irradiation portions 41 and 51 irradiate light with a light distribution such that the upper ends thereof are at about 0.57 degrees downward from the horizontal direction, and the light is blocked by a known cutoff line. The specific configuration of the low beam irradiation portions 41 and 51 is not limited, and may be a combined unit integrated with another lighting device or may be an independent low beam unit. As the Light source, a known Light source can be used, and a Light Emitting Diode (LED) may be a halogen lamp, a discharge lamp, or the like.
The ADB irradiation units 42 and 52 are illumination devices that irradiate light above the cutoff line and selectively irradiate a selective irradiation region divided into a plurality of ranges in the left-right direction. Specific configurations of the ADB irradiation units 42 and 52 are not limited, and examples thereof include a configuration in which a plurality of LEDs are arranged in an array and the LEDs are selectively turned on. The light distribution of the light irradiated by the ADB irradiation parts 42 and 52 is in a range of 0.7 to 1.5 degrees above the horizontal direction at the upper ends thereof. Here, the upper end of the light distribution indicates the upper end of the region to which a predetermined light intensity is irradiated, and is, for example, the upper end of the region to which 625 candela is irradiated.
The additional high beam irradiation units 43 and 53 are illumination devices that irradiate light also in a distant irradiation region above the selected irradiation region irradiated with light by the ADB irradiation units 42 and 52. The specific configuration of the additional high beam irradiation units 43 and 53 is not limited, and for example, the additional high beam irradiation units may be configured as high beam units that use LEDs as light sources and are integrated with the ADB irradiation units 42 and 52. The light emitted from the additional high beam emitters 43 and 53 has a light distribution such that the upper ends thereof are in the range of 2.5 to 8.0 degrees upward from the horizontal direction, and emits light in a range more than or equal to that of the conventional ADB technique and high beam.
Next, a method of controlling the vehicle headlamp according to the present embodiment will be described. First, the control unit 30 executes an imaging step of receiving a forward image captured by the camera 10 and a speed measurement step of measuring travel speed information using the speedometer 20. Next, the control unit 30 executes a position information acquisition step of acquiring position information including the presence or absence and the position of the front vehicle from the front image acquired in the imaging step by image recognition. Next, the control unit 30 executes a determination step of determining the light emission of the low beam irradiation units 41, 51, the ADB irradiation units 42, 52, and the additional high beam irradiation units 43, 53 based on the position information about the preceding vehicle obtained in the position information acquisition step and the traveling speed information obtained in the speed measurement step. Next, the control unit 30 controls the lighting of each unit based on the result of the determination step.
Fig. 2 is a diagram schematically showing the lighting control of the low beam irradiation units 41, 51, the ADB irradiation units 42, 52, and the additional high beam irradiation units 43, 53 in the present embodiment. Fig. 3 (a) to (d) are diagrams schematically showing light distribution in each case shown in fig. 2 (a) to (d).
As shown in fig. 2, in the determination step, the lighting control of the low beam irradiation units 41, 51, the ADB irradiation units 42, 52, and the additional high beam irradiation units 43, 53 is switched according to the presence or absence of the front vehicle in the position information and the speed range of the traveling speed information of the vehicle. As shown in fig. 2, a case where the speed is slower than the first speed is a low speed region, a case where the speed is equal to or higher than the first speed and is less than the second speed is a medium speed region, and a case where the speed is equal to or higher than the second speed is a high speed region. The first speed is, for example, in the range of 10-20 km/h, and the second speed is, for example, in the range of 60-70 km/h.
In the case where there is no front vehicle in the high speed region shown in fig. 2 (a), all of the near light irradiation units 41 and 51, the ADB irradiation units 42 and 52, and the additional high beam irradiation units 43 and 53 are turned on. The light distribution from the left headlamp 40 and the right headlamp 50 to the road surface 61, the pedestrian 62, and the preceding vehicle 63 in this case is shown in fig. 3 (a). In fig. 3, the range in which the near light irradiation units 41 and 51 irradiate light is indicated by a lower irradiation region 71, the range in which the ADB irradiation units 42 and 52 irradiate light is indicated by a selective irradiation region 72, and the range in which the additional high light irradiation units 43 and 53 irradiate light is indicated by a far irradiation region 73.
When a vehicle travels in a high-speed area, visibility in a distant area is important in a state where a field of view can be secured relatively far away, such as in a suburban area or an expressway. Therefore, by irradiating the lower irradiation region 71, the selected irradiation region 72, and the distant irradiation region 73 with light, a wide-range visibility can be ensured in the vicinity of about 30m from the vehicle or at a distance of 30m or more. Further, since there is no preceding vehicle, there is no possibility of glare even if light is irradiated to the selective irradiation region 72 and the distant irradiation region 73. The light irradiation to the selective irradiation region 72 is performed with light in the middle between the low beam and the high beam, and is also referred to as a center beam.
When there is no front vehicle in the middle speed region shown in fig. 2 (b), the near light irradiation units 41 and 51 are turned on, and all the selective irradiation regions of the ADB irradiation units 42 and 52 are turned on. At this time, the additional high beam irradiation parts 43 and 53 are turned off. The light distribution in this case is shown in fig. 3 (b).
When a vehicle travels in a medium speed region, it is important to ensure visibility at a short distance and prevent dazzling of pedestrians and vehicles ahead, assuming an environment where traffic is large, such as a city street. Therefore, by irradiating the lower irradiation region 71 and the selected irradiation region 72 with light, visibility in the vicinity of the vehicle can be ensured. In addition, in light irradiation to the selective irradiation region 72 using the ADB irradiation parts 42 and 52 as described later, it is possible to prevent glare to pedestrians at a short distance and to irradiate pedestrians at a long distance, and therefore, it is possible to reliably ensure the brightness with which pedestrians can be visually confirmed.
When there is a preceding vehicle in the high speed region or the middle speed region shown in fig. 2 (c), the near light irradiation units 41 and 51 are turned on, and of the selective irradiation regions of the ADB irradiation units 42 and 52, a region in which the preceding vehicle is present is turned off, and the other regions are turned on. At this time, the additional high beam irradiation parts 43 and 53 are turned off. The light distribution in this case is shown in fig. 3 (c).
In the case where there is a front vehicle in front of the vehicle, and the vehicle is traveling in a medium speed area or a high speed area, it is important to prevent glare to the front vehicle. Therefore, the control is performed to irradiate the light to the lower irradiation region 71 and to turn off the region corresponding to the front vehicle in the selected irradiation region 72. This prevents glare by irradiating only the lower irradiation region 71 with light in a direction in which a vehicle ahead is present. Further, in the direction in which there is no preceding vehicle, the light can be irradiated to the lower irradiation region 71 and the selective irradiation region 72 to prevent dazzling of pedestrians at a short distance, and light can be irradiated to pedestrians at a long distance, so that the brightness of pedestrians that can be visually confirmed can be reliably ensured.
In the case of the low speed region shown in fig. 2 (d), only the near light irradiation units 41 and 51 are turned on and the ADB irradiation units 42 and 52 and the additional high beam irradiation units 43 and 53 are turned off regardless of the presence or absence of the front vehicle. The light distribution in this case is shown in fig. 3 (d).
When a vehicle travels in a low speed region, it is necessary to improve attention to the vicinity of the vehicle, and it is important to ensure visibility at a short distance. Therefore, only the lower irradiation region 71 is irradiated with light, and the selective irradiation region 72 and the distant irradiation region 73 are turned off. This causes the vehicle to emit light from only the road surface at a sub-near distance, thereby promoting attention at a near distance.
In the above-described (a) and (b), all the ADB irradiation units 42 and 52 are turned on, but in the normal ADB control, all the ADB irradiation units 42 and 52 are instructed to be turned on when there is no front vehicle, so that the ADB control is always performed in the middle speed region and the high speed region.
Fig. 4 is a schematic diagram illustrating light irradiation and glare prevention for the selected irradiation region 72 from the ADB irradiation parts 42 and 52. Fig. 4 shows a case where the selective irradiation region 72 is irradiated with light from the vehicle headlamp 100 of the vehicle 1, and the pedestrians 3a to 3g positioned in front of the vehicle 1 are irradiated with light. The case where the pedestrians 3a to 3g are present at equal intervals of about 10m intervals from the vehicle 1 is shown.
As described above, the light distribution of the light emitted from the ADB emitters 42 and 52 is in the range of 0.7 to 1.5 degrees upward from the horizontal direction at the upper end. Therefore, as shown in fig. 3, pedestrians 3a to 3c who are present at a short distance of about 30m from the vehicle 1 are irradiated with light to the chest of the upper body, but the vicinity of the face is not irradiated. This can prevent dazzling of pedestrians 3a to 3c located at a short distance from the vehicle 1. Further, since the pedestrians 3a to 3c are irradiated with light to their chest, the pedestrians 3a to 3c located at a short distance from the vehicle 1 can be more visible.
In addition, pedestrians 3d to 3g who are located at a distance of 30m or more from the vehicle 1 can illuminate the whole body with light irradiation to the selected irradiation region 72. This can improve the visibility of pedestrians 3d to 3g located at a long distance from the vehicle 1. At this time, although the faces of the pedestrians 3d to 3g are irradiated with light, the distance from the vehicle 1 is large, so that the illuminance is low and the influence of glare is reduced compared to the short distance.
As described above, in the vehicle headlamp 100 and the control method of the vehicle headlamp 100 according to the present embodiment, the pedestrians 3a to 3g can be appropriately irradiated with light from a short distance to a long distance of the vehicle 1, and visibility of the pedestrians 3a to 3g can be improved. In addition, dazzling of pedestrians 3a to 3c located near the vehicle 1 can be prevented. Therefore, the pedestrians 3d to 3g at a long distance can be positively irradiated with light, and the field of view in front of the vehicle 1 can be ensured.
In addition, the upper end of the selective irradiation region 72 of the present embodiment is 0.7 to 1.5 degrees, which is lower than the upper end of the conventional high beam, i.e., 4.0 to 8.0 degrees, and therefore, the driver hardly feels the switching between the on and off of the selective irradiation region 72. This is because, in the conventional high beam, the upper end position is high, and therefore, the field of view irradiated to the driver is in a high range.
In the conventional high beam illumination, when the high beam is turned off, the upper part in front of the field of view of the driver becomes dark at a time, and the change in brightness due to the turning off of the high beam is sensitively sensed. In contrast, in the center beam irradiation to the selective irradiation region 72 of the present embodiment, even when it is off, the region in which the brightness in the field height direction changes is small. This makes it difficult for the driver to feel the change in brightness caused by the extinction of the center light beam that has once been irradiated to the selected irradiation region 72. Therefore, the driver is less likely to feel the discomfort of switching between on and off of the center light flux in the selective irradiation region 72, and the driver can drive comfortably.
(second embodiment)
Next, a second embodiment of the present invention will be described with reference to fig. 5 to 7. Description of the overlapping contents with the first embodiment will be omitted. Fig. 5 is a diagram schematically showing an example of arrangement of the ADB irradiation units 42 and 52 and the additional high beam irradiation units 43 and 53 in the present embodiment.
As shown in fig. 5, the present embodiment includes a left-side high-beam unit LH and a right-side high-beam unit RH, in which light emitting diodes are arranged. The light emitting diodes a1 to D1 of the four ADB irradiation sections 42 are arranged laterally with the high beam unit LH on the left side, and the light emitting diodes of the two additional high beam irradiation sections 43 are arranged. Similarly, the light emitting diodes a2 to D2 of the four ADB irradiation parts 52 are arranged laterally with the high beam unit RH on the right side, and the light emitting diodes of the two additional high beam irradiation parts 53 are arranged.
Fig. 6 is a diagram schematically showing the light distribution by the left-side high beam unit LH and the right-side high beam unit RH in the present embodiment. As shown in fig. 6, the light beams irradiated from the additional high beam irradiation parts 43 and 53 to the far irradiation region 73 are bilaterally symmetric. On the other hand, the light to the selective irradiation region 72 is divided into a left selective irradiation region 72L to be irradiated to the left side of the vehicle 1 by the ADB irradiation unit 42 and a right selective irradiation region 72R to be irradiated to the right side of the vehicle 1 by the ADB irradiation unit 52. The left selective illumination region 72L is divided into four regions A3 to D3 corresponding to the light emitting diodes a1 to D1, and the right selective illumination region 72R is divided into four regions a4 to D4 corresponding to the light emitting diodes a2 to D2. Therefore, the selective irradiation regions 72 irradiated from the left-side high beam unit LH and the right-side high beam unit RH are divided into eight in total.
Fig. 7 is a graph showing an example of the horizontal direction angle of light emitted from each light emitting diode of the ADB irradiation units 42 and 52 in the present embodiment, in which fig. 7 (a) shows the left selective irradiation region 72L and fig. 7 (b) shows the right selective irradiation region 72R. The horizontal axis in the figure indicates an angle when the central axis of the vehicle 1 is 0 degrees, a negative angle indicates a left direction from the center of the vehicle 1, and a positive angle indicates a right direction toward the center of the vehicle 1. The vertical axis in the figure shows the respective regions A3 to D3 and regions a4 to D4.
As shown in fig. 7 (a) and (B), the light irradiation angles from the light-emitting diodes B1 to D1 and the light irradiation angles from B2 to D2 are substantially bilaterally symmetrical in the left selective irradiation region 72L and the right selective irradiation region 72R. On the other hand, the light irradiation angles of the light emitting diode a1 disposed on the innermost side of the left side high beam unit LH and the light emitting diode a2 disposed on the innermost side of the right side high beam unit RH are asymmetric in the left-side selected illumination region 72L in the region A3 and the right-side selected illumination region 72R in the region a4, and the region a4 of the right-side selected illumination region 72R irradiates the left side of the vehicle 1 more widely.
Here, the light emitting diode a2 of the ADB irradiating portion 52 is a light emitting diode positioned on the leftmost side (pedestrian side) among the right headlamps 50 as headlamps on the opposite vehicle side. The light emitting diode a1 of the ADB irradiating portion 42 is a light emitting diode positioned on the rightmost side (opposite vehicle side) of the left headlamp 40 as a pedestrian side headlamp.
As described above, in the present embodiment, the left and right directions of the vehicle 1 are divided into four in the left selective irradiation region 72L and the right selective irradiation region 72R, and the entire selective irradiation region 72 is divided into eight in total to irradiate light. However, the left and right headlamps 40 and 50 disposed on the left and right of the vehicle 1 have a gap therebetween of approximately the same width as the vehicle, and the front center of the vehicle 1 is irradiated with light by the light-emitting diodes a1 and a2 disposed on the inner side. In this case, in a country where the vehicle 1 is traveling on the left side of the lane, the right headlamp 50 is an oncoming side headlamp, and even if the light distribution angle from the inside light-emitting diode a2 is enlarged toward the pedestrian side, the influence on the oncoming vehicle is small.
Therefore, in the present embodiment, by making the irradiation angle of the light emitting diode a2 of the ADB irradiation part 52 asymmetric so as to be larger than the irradiation angle of the light emitting diode a1 of the ADB irradiation part 42, it is possible to favorably irradiate the front center in the vicinity of the vehicle 1 and to prevent glare on the oncoming vehicle.
The present invention is not limited to the above embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention.
Claims (6)
1. A vehicle headlamp is characterized by comprising:
a low beam irradiation unit that irradiates light to a lower irradiation region below the cutoff line;
an ADB irradiation unit that selectively irradiates light to a selective irradiation region above the cutoff line;
an additional high beam irradiation unit for irradiating a far irradiation region above the selected irradiation region with light; and
a control unit that controls the light emission of the low beam irradiation unit, the ADB irradiation unit, and the additional high beam irradiation unit based on position information indicating a position of a preceding vehicle that is traveling ahead and traveling speed information indicating a vehicle speed of the own vehicle,
the upper end of the selective irradiation region is in a range of 0.7 to 1.5 degrees upward from the horizontal direction.
2. The vehicular headlamp according to claim 1,
the control unit controls the additional high beam irradiation unit to be turned off and the ADB irradiation unit to be turned on when the traveling speed information is equal to or higher than a first speed and is lower than a second speed,
and a controller configured to control the driving speed information to be equal to or higher than the second speed, and to turn on the additional high beam irradiation unit when the position information does not include the front vehicle.
3. The vehicular headlamp according to claim 2,
when the traveling speed information is equal to or higher than the second speed and the position information includes a preceding vehicle, the control unit turns off the additional high beam irradiation unit.
4. The vehicular headlamp according to claim 2 or 3,
the control unit turns on the low beam irradiation unit regardless of the presence or absence of the front vehicle and the traveling speed information in the position information.
5. The vehicular headlamp according to any one of claims 1 to 4,
the ADB irradiation part comprises a left side ADB part irradiating light from the center of the vehicle to the left side and a right side ADB part irradiating light to the right side,
one of the left ADB part and the right ADB part on a side closer to the opposite lane has a wider light irradiation range than the other.
6. A method for controlling a vehicle headlamp, characterized in that,
the vehicle headlamp comprises:
a low beam irradiation unit that irradiates light to a lower irradiation region below the cutoff line;
an ADB irradiation unit that selectively irradiates light to a selective irradiation region above the cutoff line; and
an additional high beam irradiation part for irradiating light above the selected irradiation region,
the upper end of the selected irradiation region is in a range of 0.7 to 1.5 degrees upward from the horizontal direction, and the control method of the vehicle headlamp comprises the following steps:
a position information acquisition step of acquiring position information indicating a position of a preceding vehicle existing ahead while traveling;
a speed measurement step of measuring traveling speed information of the vehicle; and
a determination step of determining light emission of the low beam irradiation unit, the ADB irradiation unit, and the additional high beam irradiation unit based on the position information and the traveling speed information,
in the determining step, when the traveling speed information is equal to or higher than a first speed and is lower than a second speed, the ADB irradiating unit is turned on while the additional high beam irradiating unit is turned off.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-046920 | 2019-03-14 | ||
| JP2019046920A JP6923583B2 (en) | 2019-03-14 | 2019-03-14 | Vehicle headlights and vehicle headlight control methods |
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| Publication Number | Publication Date |
|---|---|
| CN111688570A true CN111688570A (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010169380.7A Pending CN111688570A (en) | 2019-03-14 | 2020-03-12 | Vehicle headlamp and control method for vehicle headlamp |
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| Country | Link |
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| JP (1) | JP6923583B2 (en) |
| CN (1) | CN111688570A (en) |
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| CN113525224A (en) * | 2021-08-03 | 2021-10-22 | 湖南省峰度照明科技有限公司 | Intelligent car lamp capable of positioning and measuring speed through GPRS |
| CN114179712A (en) * | 2021-12-29 | 2022-03-15 | 东风汽车有限公司东风日产乘用车公司 | Vehicle headlamp control method, electronic device, and storage medium |
| CN114454807A (en) * | 2020-11-10 | 2022-05-10 | 丰田自动车株式会社 | Headlamp control device |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2020147183A (en) | 2020-09-17 |
| JP6923583B2 (en) | 2021-08-18 |
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