A two-color fog lamp system based on asymmetric light pattern

Abstract

The application discloses an asymmetric light type dual-color fog lamp system, and belongs to the technical field of automobile lighting. The system comprises a lamp plate, a white light LED group and a yellow light LED group arranged on the lamp plate, a composite lens arranged in front of the LED group, and an integrated control module. The composite lens has at least one asymmetric optical surface, which comprises a first light distribution area corresponding to the white light LED group and a second light distribution area corresponding to the yellow light LED group; by optimizing the design of the optical surface of the two light distribution areas, the white light and the yellow light form asymmetric light types in conformity with the ECE-R149 regulation, and the two are highly consistent in the vertical direction, and the light type switching deviation is less than 0.5 degrees. The application solves the technical problems of the lack of regulation adaptation of the existing dual-color fog lamp and the large light shape switching deviation of the dual color, and improves the driving safety.

Description

Technical Field

[0001] This invention relates to the technical field of automotive lighting, and in particular to a dual-color fog light system based on asymmetric light patterns. Background Technology

[0002] Fog lights are an important safety lighting device for vehicles driving in low visibility conditions. Traditional fog lights are mostly single yellow light sources, which mainly take advantage of the longer wavelength of yellow light and its better penetration in rain and fog. However, on rainy nights when lighting conditions are poor but not foggy, the overall brightness and road surface color rendering of yellow fog lights are insufficient, affecting the driver's judgment of road details.

[0003] Therefore, the concept of dual-color fog lights has emerged in existing technologies. For example, Chinese utility model patent CN208332131U discloses a dual-color fog light that arranges white LED groups and yellow LED groups side by side on the light panel, allowing manual switching to adapt to different weather conditions. While this technical solution provides a dual-color option, it has significant shortcomings: First, its design only focuses on the physical arrangement of the LEDs, such as vertical installation and fine spacing, to reduce visual jumps in light spots during switching, without addressing the core optical system design. This results in unoptimized emitted light patterns, failing to ensure compliance with stringent regulations for OEM automotive lighting, such as ECE-R149, regarding light pattern distribution, cut-off lines, and glare limits. Second, the simple LED arrangement cannot fundamentally eliminate the light pattern differences caused by two light sources with different color temperatures and luminous characteristics, potentially leading to visual deviations during switching and affecting driving safety. Finally, its switching relies entirely on manual operation and cannot be integrated with the vehicle's environmental perception system, resulting in low levels of intelligence.

[0004] In the field of automotive lighting optical design, aspherical or freeform lenses are widely used to achieve precise light distribution control. For example, existing technologies also disclose methods for shaping laser light sources using aspherical lenses. These methods involve establishing a light source model, solving for the initial surface shape using a mesh mapping method, and optimizing the result to ultimately achieve the desired far-field light spot. However, existing technologies mostly focus on achieving a single light source and a single light pattern, failing to address the challenge of achieving both regulatory compliance and highly consistent light patterns for dual-color light sources within a shared optical system. The differences in wavelength and emission point position between dual-color light sources result in different refraction paths after passing through the same lens, thus producing different far-field light patterns. Designing a fixed lens that can perfectly adapt to both light sources simultaneously presents a significant optical design challenge.

[0005] Therefore, there is an urgent need in this field for an innovative dual-color fog light system that not only provides dual-color lighting but also ensures that the light pattern under each color strictly complies with safety regulations, and that the light pattern is highly consistent when switching colors. At the same time, it can also intelligently and automatically select the optimal lighting mode according to environmental conditions. Summary of the Invention

[0006] Therefore, it is necessary to address the technical problems of existing dual-color fog light technology, such as lack of regulatory compatibility, large deviation in dual-color light pattern, and low level of intelligence, and to provide an asymmetric dual-color fog light system and its control method that has precise and controllable light pattern, complies with regulations, and intelligently switches.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides an asymmetric light pattern dual-color fog light system, which includes a lamp panel, an LED group, a composite lens, and an integrated control module.

[0009] The LED group is arranged on the lamp panel and includes a first LED group as a white light source and a second LED group as a yellow light source.

[0010] The composite lens is positioned in front of the LED group and has at least one asymmetric optical surface, which is divided into two functional regions: a first light distribution region corresponding to the white LED group and a second light distribution region corresponding to the yellow LED group. These two regions are not simply physically separated, but are defined by precisely calculated optical surface shape functions.

[0011] The design goal of the aforementioned asymmetric optical surface is: after white light passes through the first region, it forms an asymmetric light pattern that conforms to the ECE-R149 regulations, i.e., it has a clear cutoff line with lower left and higher right; after yellow light passes through the second region, it forms an asymmetric light pattern that is highly consistent with the aforementioned white light pattern in the vertical direction.

[0012] In other words, when drivers switch between using yellow light in foggy weather and white light in rainy nights, the height of the main lighting area and the position of the cutoff line will not change significantly, avoiding visual discomfort and safety hazards caused by light pattern jumps.

[0013] To achieve the aforementioned design goal of consistent light patterns, this invention employs a special correlation design for the surface profile of the compound lens. In a preferred embodiment, the surface profile functions of the two light distribution regions are mathematically correlated, ensuring their coordination at key light emission angles. This is achieved by constraining the parametric relationships between the two surface profile functions, such as the correlation equations for curvature and aspherical coefficients, or by ensuring they satisfy certain continuity conditions, such as C1 continuity, at the boundaries of the optical zones.

[0014] Secondly, this invention provides a dual-color fog light control method applied to the aforementioned asymmetric dual-color fog light system. This method uses an environmental perception unit, such as a camera, millimeter-wave radar, or humidity sensor, to monitor visibility and weather conditions ahead of the vehicle in real time, including rain, fog, and snow. The control logic unit incorporates an intelligent algorithm that compares the sensor data with preset thresholds.

[0015] For example, when visibility is extremely low, such as below 50 meters, the system automatically switches to a strong-penetrating yellow fog light mode; when visibility is acceptable but in heavy rain, it automatically switches to a bright white light enhancement mode with good color rendering. This method transforms the process from people searching for functions to functions finding people, improving both safety and convenience.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. Enhanced Regulatory Compliance and Anti-Glare Safety: Through precise optical design of the composite lens, the light patterns in both white and yellow light modes meet stringent regulations for pre-installed automotive lighting, such as ECE-R149. The core of this design lies in the adoption and strict control of an asymmetrical light pattern, characterized by a clearly defined cutoff line for light and dark areas on one side. This design not only meets the basic regulatory requirements for light pattern but, more importantly, fundamentally solves the technical problem of unexpected reflected light spots and glare caused by differences in the geometry of the front bumper or housing when adapting fog light assemblies to different vehicle models. The asymmetrical light pattern ensures that the vast majority of light energy is precisely directed to the road surface and the useful area to the side and front, while strictly suppressing upward and oncoming scattering of light, thus improving product compliance and road safety from the source of optical design.

[0018] 2. Eliminates visual deviation caused by switching between different colored lights: The zone-linked optical design ensures that the dual-color light patterns are consistent in height in the vertical direction, and the position of the light spot is stable when switching, avoiding the interference to the driver's vision caused by the jumping of light patterns in the existing technology, making the driving experience more comfortable and safer.

[0019] 3. Intelligent and Adaptive: The integrated environmental perception and control module can automatically select the optimal lighting mode according to the actual road conditions, eliminating the need for manual judgment and operation by the driver. This not only improves safety but also provides a direction for the development of intelligent automotive lighting.

[0020] 4. Simplified structure and high reliability: Dual-color precise light distribution is achieved through a fixed compound lens, eliminating the need for complex mechanical adjustment mechanisms such as movable lenses or reflectors. The system structure is simpler, the cost is lower, and the reliability is higher. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the exploded structure of Embodiment 1 provided by the present invention;

[0023] Figure 3 This is a schematic diagram of the packaging structure of another aspect of Embodiment 1 provided by the present invention;

[0024] Figure 4 The ray tracing simulation results of Embodiment 1 provided by the present invention;

[0025] Figure 5 The luminous flux distribution simulation analysis diagram of Embodiment 1 provided by the present invention;

[0026] Figure 6 This is a measured effect diagram of the light pattern distribution in Embodiment 1 provided by the present invention;

[0027] Figure 7 This is a simulation analysis diagram of the luminous flux distribution of the left and right lamps combined in Embodiment 1 of the present invention;

[0028] Figure 8 This is a measured effect diagram of the light pattern distribution of the left and right lamps combined in Embodiment 1 of the present invention;

[0029] Figure 9 This is a system structure block diagram of Embodiment 1 provided by the present invention;

[0030] Figure 10 The control logic flowchart of Embodiment 1 provided by the present invention is shown. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] The system configuration, optical design principle, optical pattern verification method, and control logic of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Embodiment 1 illustrates a core implementation scheme based on continuous asymmetric optical surfaces, while Embodiment 2 provides an alternative scheme based on microlens arrays. Example 1

[0038] As attached Figure 1 and appendix Figure 2As shown, the asymmetric dual-color fog light system provided in Embodiment 1 mainly includes a mechanical structure, an optical component, and an electronic control component. The mechanical component includes a lamp housing 2 and a lamp plate 1 for mounting LEDs. The optical component is the core, including an LED group 3 and a composite lens 4. The electronic control component is an integrated control module 5.

[0039] The LED group 3 consists of a first LED group 301 and a second LED group 302. The first LED group 301 emits white light with a color temperature of 6000K and a luminous flux of 100lm per LED. The second LED group 302 emits yellow light with a dominant wavelength of 590nm and a luminous flux of 85lm per LED. Each group can consist of a single LED chip or multiple LED chips. For example, each group can consist of three LED chips packaged in series, with a total power of 3W. In this case, the two groups of LEDs are arranged vertically with a center-to-center distance d of 0.015mm, and the light-emitting surfaces are located on the same plane.

[0040] Specifically, the first LED group 301 and the second LED group 302 can be arranged parallel to each other in the vertical direction. Optical simulation analysis revealed that when the center distance d between the two LED groups satisfies 0.01mm ≤ d ≤ 0.02mm, the light pattern deviation during dual-color switching can be minimized. If the distance is too large, such as >0.02mm, the incident points of the two light sources on the lens will differ significantly, resulting in different refraction paths; if the distance is too small, such as <0.01mm, reliability may be affected by difficulties in achieving manufacturing precision or heat dissipation issues. In other words, the aforementioned distance range is the optimized range that minimizes the dual-color light pattern deviation. Therefore, in this embodiment 1, d=0.015mm is selected as the preferred value, ensuring performance while also considering manufacturing feasibility.

[0041] Specifically, the aforementioned asymmetric dual-color fog light system can be installed on the left and right sides of the vehicle respectively.

[0042] As attached Figure 3 As shown, the composite lens 4 is made of optical-grade polymethyl methacrylate or polycarbonate. Both materials possess excellent optical transparency, weather resistance, and processing performance. Its inner surface near the LED is planar, while its outer surface is an asymmetric optical surface. This outer surface is optically divided into two virtual light distribution areas: facing the LED... Figure 3 The light distribution area Z1, located slightly to the left of the center, is primarily responsible for shaping the light emitted from the white LED group 301; the light distribution area Z2, located slightly to the right of the center, is primarily responsible for shaping the light emitted from the yellow LED group 302. The two areas are physically continuous without any steps, but their surface features are specially designed.

[0043] Furthermore, to improve optical efficiency and protect the lens surface, an anti-reflection coating is provided on the outer surface of the composite lens 4. This coating can reduce the reflection loss of light on the lens surface and improve the light energy utilization rate. At the same time, a hardening coating can also be provided to improve the wear resistance and scratch resistance of the lens surface and extend its service life.

[0044] 1. Optical design of compound lens 4:

[0045] In this embodiment 1, the asymmetric optical surface of the outer surface of the composite lens 4 is described by using the extended aspherical equation in polar coordinates combined with the azimuth modulation term to partition the surface, so as to adapt to white light and yellow light respectively.

[0046] For the first light distribution region Z1:

[0047]

[0048] For the second light distribution region Z2:

[0049]

[0050] In the formula:

[0051] r is the radial distance, in mm;

[0052] θ is the azimuth angle, in degrees;

[0053] For surface curvature, unit: ;

[0054] It is the conic constant;

[0055] The radial aspheric coefficient;

[0056] This refers to the azimuth modulation coefficient;

[0057] This is the azimuth modulation function used to form an asymmetric optical pattern.

[0058] Where θ is relative to the optical axis.

[0059] To ensure a smooth transition and high consistency of the two-color light patterns, the surface pattern functions of the first light distribution region Z1 and the second light distribution region Z2 satisfy C1 continuity at the boundary of the partition, such as the radial line with θ=0 degrees, that is, the function values ​​and the first derivative are continuous.

[0060] Furthermore, the design is optimized using optical simulation software such as Zemax or LightTools. The specific steps are as follows:

[0061] a. Establish light source models for white and yellow LEDs, including luminous size, light intensity distribution based on the Lambertian approximation, and spectrum;

[0062] b. Set optimization targets: On a virtual screen at 25 meters, the white light pattern must meet the illuminance requirements for front fog lights in ECE-R149, especially the illuminance values ​​at key test points such as V point and B50L point; the yellow light pattern must have a correlation coefficient greater than 0.95 with the white light pattern in the vertical direction, i.e., the illuminance distribution curve of the Y-axis.

[0063] c. Optimize using the curvature c, cone constant k, aspherical coefficient, and azimuth modulation coefficient in the surface formula as variables;

[0064] d. During the optimization process, the above-mentioned C1 continuity constraint is applied, that is, the constraint condition is applied so that the surface shape function of the first light distribution region Z1 and the second light distribution region Z2 satisfies C1 continuity on the radial line of the partition boundary, such as the continuity of function value and first derivative, to ensure the smooth transition of light spot.

[0065] Two sets of feasible surface parameters were obtained after optimization, as shown below:

[0066] Table 1, Example 1 of optimized surface parameters:

[0067]

[0068] Table 2, Example 2 of optimized surface parameters:

[0069]

[0070] Note: The parameters provided in Tables 1 and 2 above are examples of feasible solutions based on the dual LED light source characteristics and ECE-R149 regulatory light pattern requirements proposed according to this invention. They demonstrate how the design method of this invention, by setting two sets of similar but different parameters, enables the composite lens to simultaneously form a highly consistent asymmetric light pattern for both white and yellow light, in accordance with regulations. The specific values ​​of the parameters can be further optimized and adjusted according to the actual light-emitting characteristics of the selected LEDs, the lens material, and the target light pattern.

[0071] Furthermore, substituting the parameters from Tables 1 and 2 into the surface equation, the following can be calculated at the partition boundary θ = 0 degrees:

[0072]

[0073] This proves that the parameters provided in Tables 1 and 2 meet the C1 continuity requirement, ensuring a smooth transition of the optical surfaces of the two light distribution regions.

[0074] 2. Design goals and verification for beam pattern consistency:

[0075] The core design objective of this embodiment 1 is to achieve the following through precise optical design of the composite lens 4: white light, after passing through the first light distribution area Z1, forms an asymmetric light pattern conforming to ECE-R149 regulations; simultaneously, yellow light, after passing through the second light distribution area Z2, forms a second asymmetric light pattern with the same vertical height as the white light pattern. This means that when switching between yellow light mode in foggy weather and white light mode in rainy nights, the height of the main illumination area and the position of the cutoff line between light and dark remain largely unchanged, thus avoiding visual jumps and improving driving safety.

[0076] To quantitatively verify this design goal, the following comparative analysis is conducted through optical simulation and prototype testing:

[0077] (1) Simulation verification: Based on the above feasible surface parameters, ray tracing was performed in the simulation software, and the results are shown in the appendix. Figure 4 As shown. (Attached) Figure 4 a and c (white light), attached Figure 4 Figures b and d (yellow light) illustrate the light paths of the left and right lamps, respectively, visually reflecting the formation process of the asymmetric light pattern. Further analysis of the illuminance distribution on the 25-meter standard test screen reveals simulation results showing that the vertical illuminance distribution deviation between the first asymmetric light pattern (white light) and the second asymmetric light pattern (yellow light) is less than 8%, meeting the design requirement of a vertical illuminance distribution deviation of less than 10%. Furthermore, the horizontal deviation of the cutoff line position is 0.07 meters, meeting the requirement of a cutoff line position deviation of less than 0.1 meters.

[0078] (2) Luminous flux distribution analysis: (See attached document) Figure 5 The simulated luminous flux distribution diagram quantifies the lighting performance. (See attached image.) Figure 5 As can be seen from images a and c (left and right white light), the area of ​​high luminous flux is clearly biased to one side of the screen, while the light intensity on the other side decreases rapidly, forming a clear asymmetrical light pattern with one side lower and the other side higher. (See attached comparison image.) Figure 5 The light flux distribution patterns of b and d (left and right yellow light) are highly similar to those of white light, confirming the consistent control capability of the composite lens 4 provided in this embodiment for dual-color light patterns.

[0079] (3) Actual measurement and verification: The prototype was tested in a dark room, and the measured light pattern distribution is shown in the attached figure. Figure 6 As shown. Image processing is used to extract attachments. Figure 6 The cutoff lines for light and dark at points a (right light white) and b (right light yellow) were calculated, and their horizontal positional deviation was found to be 0.07 meters. Further analysis of the vertical illuminance distribution curves showed a correlation coefficient of 0.97. (Attached) Figure 7 With appendix Figure 8 The combined light pattern of the left and right headlights on display demonstrates that the system can create a continuous, uniform, and compliant asymmetrical lighting area in front of the vehicle.

[0080] Tests showed that the angles between the cutoff lines of the first and second asymmetric light patterns and the horizontal direction were consistently within the range of 15 degrees ± 2 degrees, fully complying with the relevant requirements of regulations such as ECE-R149.

[0081] Specifically, the optimized design was analyzed using optical simulation software. On a standard test screen at a distance of 25 meters, the vertical illuminance distribution deviation between the first asymmetric light pattern (white light) and the second asymmetric light pattern (yellow light) was measured to be less than 10%. This means that in the vertical direction, the illumination areas of the two light patterns highly overlap, and the driver will not experience a significant brightness jump when switching light sources. At the same time, the horizontal deviation between the light and dark cutoff lines of the two light patterns is less than 0.1 meters, further ensuring visual continuity during switching.

[0082] Furthermore, under the optical design constraints of this embodiment, the angles between the cut-off lines of the first and second asymmetric light patterns and the horizontal direction are consistently within the range of 15 degrees ± 2 degrees. This angle range not only meets the requirements of ECE-R149 regulations for the cut-off lines of front fog lights but also takes into account minor deviations caused by actual manufacturing tolerances and changes in the usage environment. Through the optimization of the composite lens surface shape, even with processing errors or installation deviations, the cut-off line angle of the light pattern can still be maintained between 13 and 17 degrees, ensuring regulatory compliance.

[0083] 3. Intelligent control logic description:

[0084] The structure of integrated control module 5 is as follows: Figure 9 As shown, its control logic is as follows: Figure 10 As shown, it includes:

[0085] a. Environmental perception unit: Composed of a forward-facing camera, an atmospheric transilluminator, and a rain sensor, used to acquire visibility and weather conditions information of the vehicle's surrounding environment.

[0086] b. Control Logic Unit: Implemented using a microcontroller (MCU) with a built-in intelligent switching algorithm. Based on safety regulations and actual road test data, the algorithm sets two visibility thresholds: a first threshold, for example, 100 meters, and a second threshold, for example, 200 meters, with the first threshold being less than the second threshold. When the environmental perception unit detects visibility below the first threshold, the control logic unit outputs a drive signal to illuminate the second LED group 302, entering the yellow fog light mode; when visibility is above the second threshold and the camera detects continuous heavy rain, it outputs a drive signal to illuminate the first LED group 301, entering the white light enhanced illumination mode.

[0087] c. Driving circuit unit: It contains two independent constant current driving circuits, corresponding to the first LED group and the second LED group respectively, to ensure stable operation of the LEDs.

[0088] 4. Test verification results of Example 1:

[0089] The prototype manufactured based on the above design underwent rigorous testing, and the results are as follows:

[0090] 1. Beam pattern consistency test: In a 25-meter dark room, the correlation coefficient of the vertical illuminance distribution curves of the white light mode and the yellow light mode reached 0.97, the vertical illuminance distribution deviation was less than 8%, and the horizontal light-dark cutoff line position deviation was 0.07 meters, which fully verified the effectiveness of the optical design of this embodiment.

[0091] 2. Regulatory compliance test: Both light patterns passed the ECE-R149 front fog light regulatory test on the first attempt. The illuminance values ​​of key test points, such as V point and B50L point, fully meet the standard requirements, and the angle of the light cutoff line is maintained within 15 degrees ± 2 degrees.

[0092] 3. Environmental adaptability test: The integrated control module can correctly and quickly switch lighting modes under different visibility conditions, such as 50 meters to 300 meters, and weather conditions, such as sunny days, heavy rain, and dense fog, with a system response time of less than 0.5 seconds.

[0093] Example 2:

[0094] Unlike Example 1, the two light distribution regions of the composite lens 4 are implemented using a physically slightly separated microlens array structure. The first light distribution region Z1 consists of a series of microlens units optimized for white light, and the second light distribution region Z2 consists of a series of microlens units optimized for yellow light. The two sets of microlens units are arranged alternately, macroscopically merging into a single optical surface. By optimizing the curvature and tilt angle of the two sets of microlens units separately, a dual-color asymmetric and consistent light pattern output can also be achieved; this design offers greater flexibility in manufacturing.

[0095] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A two-color fog lamp system based on asymmetric light pattern, characterized in that, It comprises: a light plate; a first LED group and a second LED group disposed on the light plate, the first LED group being a white light LED group, and the second LED group being a yellow light LED group; a composite lens disposed in front of the first LED group and the second LED group, the composite lens having at least one asymmetric optical surface; and an integrated control module electrically connected with the first LED group and the second LED group; wherein the asymmetric optical surface of the composite lens comprises: a first light distribution area corresponding to the first LED group, configured to form a first asymmetric light pattern with a bright-dark cutoff line for white light; a second light distribution area corresponding to the second LED group, configured to form a second asymmetric light pattern consistent with the first asymmetric light pattern in the vertical direction for yellow light; the first light distribution area and the second light distribution area are optical fusion areas realized by a continuously changing surface function on the same optical surface, and the surface function satisfies the following relationship: a surface type function of the first light distribution region a surface type function of the second light distribution region C1 continuity is satisfied at the partition boundary, i.e. function value and first order derivative are continuous; The asymmetric optical surface of the composite lens is described by the following extended polynomial aspherical surface equation: For the first light distribution region: For the second light distribution region: where r is a radial distance, θ is an azimuth angle, is a curvature, is a conic constant, is a radial aspherical coefficient, is an azimuth angle modulation coefficient, is an azimuth angle modulation function for forming an asymmetric light pattern.

2. The dual color fog lamp system based on asymmetric light pattern according to claim 1, characterized in that: The angles between the bright-dark cutoff lines of the first asymmetric light pattern and the second asymmetric light pattern and the horizontal direction are both 15 degrees ± 2 degrees.

3. The dual color fog lamp system based on asymmetric light pattern according to claim 1, characterized in that: The azimuth modulation function is configured such that the vertical illuminance distribution deviation of the first asymmetric light pattern and the second asymmetric light pattern is less than 10% at a test screen 25 meters away, and the bright-dark cutoff line position deviation in the horizontal direction is less than 0.1 meters.

4. The dual color fog lamp system based on asymmetric light pattern according to claim 1, characterized in that: The center distance d between the first LED group and the second LED group satisfies: 0.01mm≤d≤0.02mm, and both are arranged in parallel along the vertical direction.

5. The dual color fog lamp system based on asymmetric light pattern according to claim 1, characterized in that: The material of the composite lens is optical-grade polymethyl methacrylate or polycarbonate, and the surface is provided with an anti-reflection coating and / or a hardening coating.

6. The dual color fog lamp system based on asymmetric light pattern according to claim 1, characterized in that: The integrated control module comprises: an environment perception unit for acquiring visibility and weather condition information of the vehicle's surrounding environment; a control logic unit connected with the environment perception unit, configured to output a driving signal for controlling switching of the first LED group and the second LED group according to a preset threshold rule; a driving circuit unit connected with the control logic unit and the LED group.

7. The dual color fog lamp system based on asymmetric light pattern according to claim 1, wherein: The control logic unit is configured to: when the environment perception unit detects that the visibility is lower than a first threshold, control the second LED group to be lit, entering a yellow light fog lamp mode; when the environment perception unit detects that the visibility is higher than a second threshold and the weather condition is rainy, control the first LED group to be lit, entering a white light enhanced illumination mode; wherein the first threshold is less than the second threshold.

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