CN109827138B - Dynamic lighting control method and system for car lamp and car lamp - Google Patents
Dynamic lighting control method and system for car lamp and car lamp Download PDFInfo
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Abstract
The invention provides a car light dynamic lighting control method and a device thereof, which adopts a car light dynamic lighting control system comprising a light source and a lens, wherein the light source is a plane light source, such as an LED light emitting chip plane light source, the optical axis of the plane light source is aligned with the incident surface of the lens, after the light rays which are approximately lambertian diverged and are emitted by the plane light source are collimated by the lens, the light rays which pass through the lens are transmitted in an approximately parallel manner, a light shape of a high-brightness light beam is formed on a front screen, the plane light source is arranged in front of or behind the focal point of the lens, namely, lens defocusing quantity of the plane light source is regulated to realize the change of the light shape of the front screen, namely dynamic lighting, so that different lighting light shapes are set according to different car speeds and road conditions. Therefore, the purposes of improving the light efficiency, driving safety and reducing the cost are achieved.
Description
Technical Field
The invention relates to a car lamp, in particular to a dynamic illumination control method and a device thereof and a car lamp, wherein the dynamic illumination control method and the device thereof and the car lamp have a high beam illumination light shape adjusting function and a low beam illumination light shape adjusting function at the same time, and more particularly, the dynamic illumination adjusting can switch light shapes between different positions preset corresponding to different lens defocus amounts and can also continuously change the light shapes so as to achieve the purposes of forming different illumination light shapes according to different car speeds and different road conditions, improving illumination effects, ensuring driving safety and reducing cost.
Background
Currently, laser light sources are widely used for car lights.
For example, publication number CN107314324a discloses a high beam lamp, which uses the characteristic that the light emitting point of the laser light source is small and the projected light is concentrated, and uses blue laser to excite a yellow fluorescent sheet as a light source, and then uses a laser reflecting cup and an optical lens to project the light to the road surface, so as to achieve the purpose of long irradiation distance.
However, the implementation manner and principle of the high beam lamp are not different from those of the conventional projection type lighting system, namely, by arranging an ellipsoidal-like reflector with two focuses, the light source is arranged at a near focus, approximately lambertian divergent light emitted by the light source is converged to a far focus through the reflector, the far focus is arranged near the focus of the lens, and the divergent light is collimated by the lens and then emitted in a horizontal direction in a nearly parallel manner. An inherent disadvantage of conventional projection lighting systems is that the reflectivity of the ellipsoidal reflector is generally not more than 85%, thereby resulting in a reduction in the overall light efficiency of the implementation of the high beam.
On the other hand, an important problem of the use of laser light sources for lamp illumination is: the light energy is too concentrated, and the light energy is often required to be scattered by a fluorescent sheet to be used as a light source. At this time, once the laser is accidentally irradiated to the road surface, for example, the fluorescent powder layer is broken down, and the laser is accidentally irradiated to the smooth surface with higher reflectivity in the lamp; or the car lamp is impacted accidentally, so that under extreme conditions such as displacement or inclination of the laser light source, the road surface is subjected to unpredictable strong light hazard. Therefore, a set of strict safety protection system is needed to ensure that detection and judgment can be made under extreme conditions, and the laser power supply is turned off in time so as to ensure the safety of pedestrians. However, the presence of the safety protection system provided for this purpose results in a considerable increase in technical difficulty and in the overall cost of application.
Furthermore, as the safety problem of vehicles driving at night is increasingly prominent, the existing AFS function only changes the shape of the dipped beam so as to meet different lighting requirements under different environments and road conditions and improve the driving safety. Whereas the high beam illumination cannot be converted.
In addition, the existing high beam car lamp system is in a static mode, and different illumination light shapes are difficult to set according to different car speeds and different road conditions.
Disclosure of Invention
In order to solve the problems, the invention provides a dynamic lighting control method and a device thereof and a car lamp, wherein the dynamic lighting control method and the device thereof and the car lamp have a high beam lighting shape adjusting function and a low beam lighting shape adjusting function at the same time, and particularly, under the condition of vehicle night driving, the dynamic lighting control method and the device thereof not only aim at the low beam lighting shape, but also can dynamically change the high beam lighting shape in order to meet different lighting requirements under different environments and road conditions and improve driving safety.
In addition, the existing high beam car lamp system is in a static mode, and different illumination light shapes are difficult to set according to different car speeds and different road conditions.
More specifically, the dynamic illumination adjustment can perform jump type light shape switching between different preset light shape positions corresponding to different lens defocus amounts, and can also perform continuous light shape conversion so as to form different illumination light shapes according to different vehicle speeds and different road conditions. For example, low-speed traveling is suitable for a light shape with a large defocus amount, and as shown in fig. 16, the illumination range is large but the distance is short. The high-speed running is suitable for the light shape shown in fig. 11, the illumination distance is long, but the illumination range is small, so that the purposes of improving the light efficiency, running safety and reducing the cost are ensured.
The technical scheme of the dynamic illumination control system is as follows:
a dynamic lighting control method for car lamp, which adopts a car lamp dynamic lighting control system comprising a light source and a lens, is characterized in that,
the light source is an LED light-emitting chip area light source,
the optical axis of the surface light source is aligned with the incident surface of the lens,
after the light rays which are approximately lambertian and are emitted by the surface light source are collimated by the lens, the light rays which are transmitted by the lens are transmitted in an approximately parallel mode, the light shape of the highlight light beam is formed on the front screen,
the surface light source is arranged in front of or behind the focal point of the lens to form lens defocusing, and the relative position of the surface light source relative to the focal point of the lens, namely the lens defocusing amount, is adjusted to realize the change of the light shape of the front screen, namely dynamic illumination.
The larger the lens defocus causes the larger the spread of the illumination light shape, the smaller the Emax value, but the larger the illumination range, and therefore the illumination light shape can be changed by adjusting the relative position of the light source with respect to the lens focus, i.e., the lens defocus amount, the larger the light spot, and the smaller the Emax value. Dynamic illumination can be achieved according to the amount of lens defocus adjustment while at the same time high beam maximum (Emax value) can be achieved.
The invention relates to a dynamic lighting control method for a car lamp, which is characterized in that,
the light source is a rectangular or square LED light-emitting chip area light source, the lens defocus amount is 0-5mm in front of or behind the lens focus,
the light-emitting characteristic of the surface light source is similar to lambertian divergence, and the light-emitting angle is half of 0 to 90 DEG
Sphere range. The light emission characteristics are shown in fig. 2.
The invention relates to a dynamic lighting control method for a car lamp, which is characterized in that,
the dynamic illumination light shapes can be switched among a plurality of different positions preset corresponding to different lens defocus amounts, and the corresponding dynamic illumination light shapes are in jump type conversion so as to set different illumination light shapes according to different vehicle speeds and road conditions.
For example, a jump switch is made in different lighting modes, such as a switch between urban road mode and highway mode. And the fine adjustment of continuous conversion can be performed according to the vehicle speed under the same illumination mode.
That is, according to the present invention, a plurality of lens defocus amounts can be preset, and jump position switching is performed between different lens defocus amounts, and the corresponding light shapes are also jump-type transitions (switching between 6 light shapes as shown in fig. 11 to 16).
The invention relates to a dynamic lighting control method for a car lamp, which is characterized in that,
the dynamic illumination light shape can be continuously transformed between different positions preset corresponding to different lens defocus amounts, and the corresponding dynamic illumination light shape is also continuously transformed, namely, the defocus amount is continuously transformed, and the light shape is correspondingly and continuously transformed.
That is, the lens defocus amount is dynamically continuously changed, and the corresponding light shape is also continuously changed, so as to avoid discomfort of human eyes caused by suddenly changed illumination light shape.
As shown in fig. 11, the light shape of the rectangular light emitting chip with 1mm x 5mm is set at the focal point of the lens, which is suitable for high-speed driving, and is characterized by large Emax value, long illumination distance and smaller illumination range. If 1mm is 5mm rectangle luminescence chip sets up the light form in 5mm department from lens focus, is fit for urban road conditions, and the characteristics lie in that the illumination scope is big, but Emax is not high, namely the illumination distance is not far away.
The invention relates to a dynamic lighting control method for a car lamp, which is characterized in that,
the light emitting chip is arranged at the focal point of the lens, and the light shape at the focal point of the lens is suitable for high-speed running.
The technical scheme is characterized in that the Emax value is large, the illumination distance is long, and the illumination range is small.
The invention relates to a dynamic lighting control method for a car lamp, which is characterized in that,
the light-emitting chip is arranged at the position 5mm away from the focal point of the lens so as to be suitable for the illumination of urban road conditions.
The invention relates to a dynamic lighting control method for a car lamp, which is characterized in that,
the rectangular light-emitting chip is selected from rectangular light-emitting chips with the length of 1mm being 1-5mm, and the square light-emitting chip is selected from square light-emitting chips with the length of 1-5mm being 1-5 mm.
The invention relates to a dynamic lighting control method for a car lamp, which is characterized in that,
the rectangular light emitting chip is selected from rectangular light emitting chips with the size of 1mm and 5 mm.
The invention relates to a dynamic lighting control method for a car lamp, which is characterized in that,
a light shielding plate is disposed near the surface light source, which is disposed at the focal point of the lens, and the surface light source is disposed behind the light shielding plate to form a low beam illumination having a cutoff line or a part of the low beam illumination.
According to the method for controlling dynamic illumination of the vehicle lamp, the lens is a convex lens, and the convex lens is selected from a plano-convex lens, a hyperboloid lens, a Fresnel lens and a lens group.
According to the invention, a dynamic lighting control system comprises a light source and a lens, and is characterized in that,
the light source is an LED light-emitting chip area light source,
the optical axis of the surface light source is aligned with the incidence surface of the lens, the light emitting angle is in the hemispherical range of 0 to 90 degrees,
after the light rays which are approximately lambertian and are emitted by the surface light source are collimated by the lens, the light rays which are transmitted by the lens are transmitted in an approximately parallel mode, the light shape of the highlight light beam is formed on the front screen,
the surface light source is arranged in front of or behind the focal point of the lens to form lens defocusing, and the relative position of the surface light source relative to the focal point of the lens, namely the lens defocusing amount, is adjusted to realize the change of the light shape of the front screen, namely dynamic illumination.
The lens defocus causes the diffusion of the illumination light shape to be large, the Emax value is reduced, but the illumination range is also enlarged, so that the illumination light shape can be changed by adjusting the relative position of the light source relative to the focal point of the lens, namely the lens defocus amount, and the larger the lens defocus amount is, the larger the light spot is, the smaller the Emax value is, and the Emax corresponding to the light shape is different from the different defocus amounts. Dynamic illumination can be achieved based on adjusting the amount of lens defocus.
The dynamic lighting control system for the car lamp is characterized in that,
the surface light source is arranged at the position 0-5mm in front of or behind the focal point of the lens,
the dynamic illumination light shapes can be switched among a plurality of different positions preset corresponding to different lens defocus amounts, and the corresponding dynamic illumination light shapes are in jump type conversion so as to set different illumination light shapes according to different vehicle speeds and road conditions.
If the lens defocus amount is larger during low-speed running, the maximum value of the high beam is lower, but the illumination range is larger. The high-speed driving adopts smaller lens defocus amount or no lens defocus amount to realize higher high beam maximum value so as to realize the purpose of farther illumination.
The dynamic lighting control system for the car lamp is characterized in that,
the area light source is arranged at the position 0-5mm in front of or behind the focal point of the lens, different positions of the light shape are preset corresponding to different lens defocus amounts, the dynamic illumination light shape can be switched among a plurality of different positions preset corresponding to different lens defocus amounts, and the corresponding dynamic illumination light shape is continuously changed so as to set different illumination light shapes according to different vehicle speeds and road conditions.
If the lens defocus amount is larger during low-speed running, the maximum value of the high beam is lower, but the illumination range is larger. The high-speed driving adopts smaller lens defocus amount or no lens defocus amount to realize higher high beam maximum value so as to realize the purpose of farther illumination.
The dynamic lighting control system for the car lamp is characterized in that,
a light shielding plate disposed near the surface light source and at the focal point of the lens, the surface light source being disposed behind the light shielding plate for forming low beam illumination having cut-off line, or a part of the low beam illumination
Thus, a higher 75R test point illuminance value can be achieved with a smaller luminous flux.
According to the dynamic lighting control system for the car lamp, the lens is a convex lens, and the convex lens is selected from a plano-convex lens, a hyperboloid lens, a Fresnel lens and a lens group thereof.
According to the dynamic lighting control system for the car lamp, the dynamic lighting system is used for a head lamp.
The dynamic lighting control system for the car lamp is characterized in that,
the dynamic lighting system is used for daytime running light, position light, brake light, steering light and fog light functions.
The invention has the following advantages and outstanding effects: simple structure just combines the lens through full light source and just can realize higher Eman value, and the dipped beam is then realized on this basis to add the light screen. The technology of the invention is mature, and the existing LED light source and lens can meet the output requirement. The light efficiency is high, and a higher test value of the test point can be realized by smaller output luminous flux.
Drawings
Fig. 1 is a schematic view of the dynamic illumination of the vehicle lamp of the present invention.
Fig. 2 is a schematic diagram of the relationship between the light intensity and the angle of the LED light emitting chip, which illustrates the light emission characteristics of a surface light source, such as the LED light emitting chip, similar to lambertian divergence.
Fig. 3 is a schematic diagram of a simulated light pattern of a light source input at 180 lumen conditions.
Fig. 4 is a schematic illustration of the measured light pattern of a product with a light source input at 180 lumens.
Fig. 5 is a schematic view of the overall screen illuminance of the low beam.
Fig. 6 is a partial schematic view of the overall screen illuminance of the low beam. In the figure, the H at the 75R test point is 1.15 degrees and V is 0.57 degrees.
Fig. 7 is a schematic view of a low beam module with a shade.
Fig. 8 is a schematic view of a low beam module with a shade.
Fig. 9 is a schematic view of the light path of the low beam module with a shade.
Fig. 10 is a schematic diagram of a simulation of the illuminance of a low beam module with a shade according to the present invention.
Fig. 11 is a schematic view of the light pattern at the focal point of a rectangular LED light emitting chip (1 mm×5 mm).
Fig. 12 is a schematic diagram of the light pattern of a rectangular LED light emitting chip (1 mm×5 mm) in 1mm out of focus.
Fig. 13 is a schematic diagram of a light pattern of a rectangular LED light emitting chip (1 mm×5 mm) in 2mm out of focus.
Fig. 14 is a schematic diagram of the light pattern of a rectangular LED light emitting chip (1 mm×5 mm) in 3mm out of focus.
Fig. 15 is a schematic diagram of a light pattern of a rectangular LED light emitting chip (1 mm×5 mm) in a 4mm out-of-focus position.
Fig. 16 is a schematic diagram of a light pattern of a rectangular LED light emitting chip (1 mm×5 mm) in 5mm out of focus.
In the figure, 1 is an LED light source, 2 is a lens, 3 is an LED circuit board, 4 is a light shielding plate, 5 is a light shielding plate cut-off line, and 6 is a 75R test point.
Detailed Description
Examples
The method is characterized in that a rectangular LED light emitting chip (1 mm is 5 mm) is arranged near a focus on the inner side of a convex lens, light rays which are emitted by an LED light source and are approximately lambertian and are scattered are converged into approximately parallel light rays after passing through the convex lens, the light rays are horizontally irradiated to a road surface to form a high beam maximum value (Emax), and by the method, under the condition that the output luminous flux of the LED light source with the luminous area of 0.5 square millimeter is not more than 200lm, the Emax value can exceed 240lx, namely the upper limit of Emax value specified by regulations is exceeded. Fig. 4 shows simulated screen illumination results, and fig. 5 shows actual measurement of the product. And the Emax value determines the distance of the high beam irradiation.
The method can also be used for test points with higher required brightness in the low beam, such as 75R value. On the basis of the invention, a light shielding plate is arranged near the area light source, the light shielding plate is arranged at the focal point of the lens, the area light source is arranged behind the light shielding plate and is used for forming low beam illumination with a cut-off line or part of the low beam illumination, namely, a local low beam illumination light shape near a low beam inflection point, and a complete low beam light shape is realized in combination with an auxiliary low beam unit, so that a higher 75R test point illumination value can be realized through smaller luminous flux.
And then, respectively arranging rectangular LED light emitting chips (1 mm is 5 mm) at positions of 1mm,2mm,3mm,4mm and 5mm away from the focus on the inner side of the convex lens to obtain different light shapes for high beam illumination. At this time, as the defocus amount increases, the high beam maximum value becomes lower, but the illumination range becomes larger. Different vehicle speeds can be adopted correspondingly, for example, smaller lens defocus amount or no lens defocus amount is adopted when the vehicle runs at high speed, and higher high beam maximum is realized, so that the aim of farther illumination is fulfilled.
According to the far-reaching headlamp rule, the maximum value of the far-reaching beam (Emax) needs to be within a certain brightness range, for example, the automotive LED headlamp GB25991 is a lamp lighting function rule about an LED light source, and the requirements of the light distribution performance of the headlamp with the LED as the light source, including the lighting functions of the far-reaching beam, the low-reaching beam and the like, are determined. The maximum value of the high beam (namely Emax value) is required to be between 48lx and 240lx, the 75R test point of the low beam is required to be not lower than 12lx, and the value is generally increased to be more than 20lx when the actual lamp is designed for better illumination effect.
According to the dynamic lighting control method and the device and the car lamp thereof, the device and the car lamp have the functions of adjusting the high beam lighting light shape and adjusting the low beam lighting light shape, and particularly, under the condition of night driving of a car, the car safety is improved in order to meet different lighting requirements under different environments and road conditions, and the high beam lighting light shape can be dynamically changed.
The dynamic illumination adjustment can be used for jumping type light shape switching between different light shape positions preset corresponding to different lens defocus amounts, and can also be used for continuously changing the light shape so as to form different illumination light shapes according to different vehicle speeds and different road conditions.
Claims (10)
1. A dynamic lighting control method for car lamp, which adopts a car lamp dynamic lighting control system comprising a light source and a lens, is characterized in that,
the light source is an LED light-emitting chip area light source,
the optical axis of the surface light source is aligned with the incident surface of the lens,
after the light rays which are approximately lambertian and are emitted by the surface light source are collimated by the lens, the light rays which are transmitted by the lens are transmitted in an approximately parallel mode, the light shape of the highlight light beam is formed on the front screen,
the surface light source is arranged in front of or behind the focal point of the lens to form lens defocusing, the relative position of the surface light source relative to the focal point of the lens, namely the lens defocusing amount is regulated to realize the change of the light shape of the front screen, namely dynamic illumination,
the dynamic illumination light shapes can be switched among a plurality of different positions preset corresponding to different lens defocus amounts, the corresponding dynamic illumination light shapes are in jump type conversion so as to set different illumination light shapes according to different vehicle speeds and road conditions,
the jump switching is performed in different lighting modes, including switching between urban road mode and highway mode,
and the fine adjustment of continuous conversion can be performed according to the vehicle speed under the same illumination mode.
2. The method for controlling dynamic illumination of a vehicle lamp according to claim 1, wherein the light source is a rectangular or square LED light emitting chip area light source, the lens defocus amount is 0-5mm in front of or behind the lens focus,
the light emission characteristic of the surface light source is similar to lambertian divergence, and the light emission angle is in a hemispherical range of 0 to 90 degrees.
3. The method for controlling dynamic illumination of a vehicle lamp according to claim 2, wherein a rectangular or square LED light emitting chip area light source is provided at a lens focal point, and a light shape at the lens focal point is suitable for high-speed running.
4. The method for controlling dynamic illumination of a vehicle lamp according to claim 2, wherein a rectangular or square light emitting chip area light source is arranged at a position 5mm away from the focal point of the lens, so as to be suitable for road condition illumination of urban roads.
5. The method for controlling dynamic illumination of a vehicle lamp according to any one of claims 2 to 4, wherein the rectangular light emitting chip surface light source is selected from rectangular light emitting chips of 1mm by 1mm to 5mm, and the square light emitting chip surface light source is selected from square light emitting chips of 1mm by 1mm to 5 mm.
6. The method of claim 5, wherein the rectangular light emitting chip surface light source is selected from the group consisting of 1mm by 5mm rectangular light emitting chips.
7. The dynamic lighting control method for a vehicle lamp according to claim 1, wherein a shade is provided in the vicinity of a surface light source, the shade being provided at a lens focus, the surface light source being provided behind the shade for forming a low beam light having a cutoff line or a part of the low beam light.
8. A dynamic lighting control system of a car lamp comprises a light source and a lens, and is characterized in that the light source is an LED light emitting chip area light source,
the optical axis of the surface light source is aligned with the incidence surface of the lens, the light emitting angle is in the hemispherical range of 0 to 90 degrees,
after the light rays which are approximately lambertian and are emitted by the surface light source are collimated by the lens, the light rays which are transmitted by the lens are transmitted in an approximately parallel mode, the light shape of the highlight light beam is formed on the front screen,
the surface light source is arranged in front of or behind the focal point of the lens to form lens defocusing, the relative position of the surface light source relative to the focal point of the lens, namely the lens defocusing amount is regulated to realize the change of the light shape of the front screen, namely dynamic illumination,
different positions of the preset light shapes corresponding to different lens defocus amounts can be switched between a plurality of different positions corresponding to different lens defocus amounts, the corresponding dynamic illumination light shapes are in jump type conversion so as to set different illumination light shapes according to different vehicle speeds and road conditions,
the jump switching is performed in different lighting modes, including switching between urban road mode and highway mode,
and the fine adjustment of continuous conversion can be performed according to the vehicle speed under the same illumination mode.
9. The dynamic lighting control system for a vehicle lamp according to claim 8, wherein the surface light source is disposed at 0 to 5mm in front of or behind the focal point of the lens.
10. The dynamic lighting control system for a vehicle lamp according to claim 8, wherein a shade is provided near the surface light source, the shade being provided at the focal point of the lens, the surface light source being provided behind the shade for forming a low beam light or a part of the low beam light having a cutoff line.
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| CN201810775459.7A CN109827138B (en) | 2018-07-13 | 2018-07-13 | Dynamic lighting control method and system for car lamp and car lamp |
| PCT/CN2019/088522 WO2020010932A1 (en) | 2018-07-13 | 2019-05-27 | Vehicle light dynamic control method, system thereof, and vehicle light |
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| TWI753446B (en) * | 2020-06-01 | 2022-01-21 | 財團法人車輛研究測試中心 | Headlight optical system and its application lamps |
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