Composite light distribution LED lamp and control method

Abstract

The application discloses a composite light distribution LED lamp and a control method, and relates to the field of LED lamps, and aims to provide a composite light distribution LED lamp and a control method, which can eliminate the illumination depression at the junction of the spotlight and the floodlight spot, can maintain the total driving power basically constant and the total light output stable, and can effectively solve the problems of the blind area of a curve, the illumination deviation of a slope, and the dark area of a spot transition.

Description

Technical Field

[0001] This invention relates to the field of lighting fixtures, specifically to a composite light distribution LED luminaire and its control method. Background Technology

[0002] With the increasing demand for intelligent lighting from off-road vehicles, construction machinery, and special lighting scenarios, the fixed light distribution structure of traditional LED lamps is no longer able to meet the lighting requirements under complex dynamic working conditions.

[0003] Currently, most existing LED luminaires use a single reflector or a simple combination of reflective structures. Focusing and diffusing light are typically achieved by independent luminaires or simply assembled optical modules, leading to illuminance dips or dark areas in the transition zone between the focused and diffused light spots, resulting in poor lighting continuity. Meanwhile, mainstream adaptive headlight systems (AFS) mostly employ a single-system overall rotation or a purely electronic matrix dimming scheme. The former only changes the direction of illumination while maintaining the beam pattern during turns, leaving blind spots on the inside of curves; the latter, while adjusting the beam pattern, cannot compensate for the illumination offset caused by the fixed physical orientation of the luminaire.

[0004] Therefore, under complex operating conditions such as vehicle turning, driving on slopes, and sudden changes in ambient light, existing solutions generally suffer from insufficient lighting adaptability, specifically manifested as defects such as lighting blind spots, dark areas in light spot transitions, and deviations in illumination direction, making it difficult to meet the usage requirements of high-end intelligent lighting scenarios. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a composite light distribution LED lamp to solve the technical problems of blind spots on curves, irradiation deviation on slopes, and dark transition areas in existing lighting fixtures.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a composite light distribution LED luminaire, comprising: Heat dissipation housing; An optical path structure includes a focusing component and a projection component, both of which are installed inside the heat dissipation housing. The focusing component is used to form a focusing optical path, and the projection components are placed on both sides of the focusing component to form a diffused optical path. A rotating mechanism, the movable end of which is connected to the heat dissipation housing, drives the heat dissipation housing to rotate; An environmental detection unit is used to acquire environmental detection signals; and The control unit is electrically connected to the focusing component, the projection component, the rotating mechanism, and the environmental detection unit. It is used to synchronously adjust the brightness ratio of the focusing light path and the diffused light path according to the environmental detection signal and drive the rotation angle of the rotating mechanism so that the illuminance of the diffused light path on the same side as the horizontal rotation direction of the rotating mechanism increases with the increase of the rotation angle, and the illuminance of the focusing light path decreases accordingly.

[0007] In some embodiments, the focusing component includes a plurality of spotlight cups and a plurality of spotlight beads, the spotlight beads being installed one-to-one inside the spotlight cups to project a circular light spot; the projection component includes a middle component, spotlight cups and spotlight beads, the plurality of spotlight cups being placed on both sides of the middle component, the spotlight beads being installed on both sides of the middle component and arranged one-to-one with the spotlight cups to project an elliptical light spot, and the light spots projected by two projection components and the focusing component forming a batwing-shaped composite light spot.

[0008] In some embodiments, a main lamp board is further included, wherein the main lamp board is provided with an extension lamp board extending vertically to the inner side of the intermediate member, the main lamp board is installed in the heat dissipation housing, the spotlight lamp bead is installed on the main lamp board, the floodlight lamp bead is installed on the extension lamp board, and each intermediate member corresponds to two extension lamp boards, a notch is formed between the two corresponding extension lamp boards, and the heat dissipation housing is provided with a heat dissipation block embedded in the notch for fitting the extension lamp board and forming an integral heat dissipation structure with the heat dissipation housing.

[0009] In some embodiments, the focusing optical path is configured to converge and emit light at a first illumination angle α to form the circular light spot at a preset distance; the diffuse optical path is configured to diffuse and emit light at a second illumination angle β to form the elliptical light spot at the preset distance; the first illumination angle α is 5°-15°, and the second illumination angle β is 40°-80°.

[0010] In some embodiments, the circular light spot is elliptical, with a major axis to minor axis ratio of 1:1-1.2:1, and the central illuminance is more than 10 times the edge illuminance; the aspect ratio of the elliptical light spot is 2:1-4:1, and the illuminance uniformity is ≥70%; the major axis of the circular light spot is arranged parallel to the major axis of the elliptical light spot, and two elliptical light spots extend from the waist towards the middle and overlap with the circular light spot, with the circular light spot placed at the center of the overlapping area; the waist area of ​​the elliptical light spot covers the transition attenuation area of ​​the circular light spot, so that the illuminance of the elliptical light spot in the overlapping area is 10%-30% of the central illuminance of the circular light spot, and not lower than the edge illuminance of the circular light spot, in order to fill the illuminance depression.

[0011] In some embodiments, a feedback detection unit is further included, comprising a light feedback sensing module and a temperature sensing module. The light feedback sensing module is disposed at the light outlet of the heat dissipation housing and is used to detect the actual light output intensity emitted through the light path structure. The temperature sensing module is installed inside the heat dissipation housing and is used to detect the temperature of the lamp and / or the temperature of the lamp panel. The control unit is also electrically connected to the feedback detection unit and is used to correct the brightness ratio according to the deviation between the actual light output intensity and the target light output intensity, and to correct the driving parameters of the focusing component and the projection component according to the lamp temperature.

[0012] In some embodiments, the control unit includes: The light pattern-rotation coordinated control module is used to synchronously calculate the brightness ratio adjustment amount of the focusing light path and the diffused light path, as well as the target rotation angle of the rotating mechanism, based on the steering angle and vehicle speed in the environmental detection signal. The thermal management module is used to reduce the drive current or switch to a low-power mode when the temperature exceeds a threshold, based on the lamp temperature signal.

[0013] In some embodiments, the rotating mechanism includes a horizontal rotation drive component, a pitch rotation drive component, and an angle feedback component. The horizontal rotation drive component is used to drive the heat sink housing to rotate horizontally about a vertical axis, the pitch rotation drive component is used to drive the heat sink housing to rotate in pitch about a horizontal axis, and the angle feedback component is used to provide real-time feedback of the current rotation angle to the control unit.

[0014] In some embodiments, the environmental detection signal includes one or more of ambient illuminance, vehicle speed, steering angle, and vehicle attitude.

[0015] Secondly, the present invention also provides a control method, which is executed by the control unit described above and applied to the composite light distribution LED lamp described in any of the above embodiments, comprising the following steps: S1. Acquire environmental detection signals; S2. Based on the environmental detection signal, calculate the brightness ratio adjustment amount of the focusing optical path and the diffused optical path, as well as the target rotation angle of the rotating mechanism; S3. Adjust the driving parameters of each optical path according to the brightness ratio adjustment amount, so that the illuminance of the diffuse optical path on the same side as the horizontal rotation direction of the rotating mechanism increases with the increase of the rotation angle, and the illuminance of the focusing optical path decreases accordingly. S4. Based on the target rotation angle, control the rotation mechanism to dynamically adjust the orientation of the heat dissipation housing; S5. Real-time acquisition of the actual light output intensity and lamp temperature of the focusing light path and the diffused light path; correction of the brightness ratio based on the deviation between the actual light output intensity and the target light output intensity; correction of the driving parameters based on the lamp temperature; and return to step S1.

[0016] Compared with existing technologies, the composite light distribution LED lamp provided by this invention integrates the focusing component and the projection components placed on both sides into the same housing, forming a composite light path structure with central focusing and side diffused light. This allows the diffused light path to cover the edge transition area of ​​the focused light spot, effectively eliminating the illuminance dip at the junction of the focused and diffused light spots and solving the problem of dark transition areas. The control unit synchronously adjusts the brightness ratio of the focusing and diffused light paths according to the environmental detection signal and drives the rotating mechanism to rotate the housing. When the vehicle turns, the rotating mechanism can actively deflect the illumination direction to compensate for the blind spot on the inside of the curve, and can also enhance the side illumination range by increasing the brightness ratio of the diffused light path on the turning side. At the same time, by reducing the brightness of the focusing light path, the total driving power is kept basically constant, and the total light output remains relatively stable after feedback closed-loop correction, avoiding visual discomfort caused by sudden brightness changes. Furthermore, the rotating mechanism can also perform pitch compensation according to the vehicle posture, effectively suppressing the illumination offset when driving on slopes, and effectively improving the lighting adaptability and continuity under complex working conditions. Attached Figure Description

[0017] Figure 1 This is a three-dimensional view of the composite light distribution LED lamp provided in the embodiment of the present invention; Figure 2 This is a front view of the composite light distribution LED lamp provided in an embodiment of the present invention; Figure 3 This is a side sectional view of the composite light distribution LED lamp provided in the embodiment of the present invention; Figure 4 This is an exploded view of the composite light distribution LED lamp provided in the embodiment of the present invention; Figure 5 This is a schematic diagram of the elliptical light spot of the composite light distribution LED lamp provided in the embodiment of the present invention; Figure 6 This is a schematic diagram of the circular light spot of the composite light distribution LED lamp provided in the embodiment of the present invention; Figure 7 This is a control block diagram of the composite light distribution LED lamp provided in the embodiments of the present invention; Figure 8 This is a flowchart of the control method provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the composite light spot of the composite light distribution LED lamp provided in the embodiment of the present invention; Figure 10This is a schematic diagram of the structure of a composite light distribution LED lamp provided in a feasible embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of a composite light distribution LED lamp provided in another feasible embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 10. LED lighting fixtures; 1. Heat dissipation housing; 11. Light outlet; 12. Receiving cavity; 13. Heat sink; 14. Face frame; 15. Light-transmitting plate; 16. Sealing ring; 17. Scrolling light; 2. Optical path structure; 21. Focusing component; 211. Focusing lamp cup; 212. Focusing lamp bead; 213. Circular light spot; 22. Flooding component; 221. Intermediate component; 222. Flooding lamp cup; 223. Flooding lamp bead; 224. Elliptical light spot; 23. Main lamp board; 231. Extension lamp board; 232. Notch; 3. Rotation mechanism; 31. Horizontal rotation drive assembly; 32. Pitch rotation drive assembly; 33. Angle feedback assembly; 4. Environmental monitoring unit; 5. Control unit; 51. Optical pattern-rotation coordinated control module; 52. Thermal management module; 6. Feedback detection unit; 61. Optical feedback sensing module; 62. Temperature sensing module. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] To address the technical problems of blind spots on curves, irradiation deviation on slopes, and dark areas in light spot transitions in existing lighting fixtures, this invention provides a composite light distribution LED lamp. By integrating a focusing component and a projection component placed on both sides of it into the same heat dissipation housing, a composite light path structure with central focusing and side diffusion is formed. With the coordinated linkage control of light pattern and rotation, dynamic adaptive reconstruction of the lighting light pattern and illumination direction is achieved.

[0021] It should be noted that the LED lights described in this invention are used in, but not limited to, off-road vehicle headlights, construction machinery work lights, and special vehicle searchlights. For ease of explanation, this invention only uses the application of LED lights in off-road vehicle headlights as an example. The principle of applying LED lights to other types of equipment is essentially the same as that applied to off-road vehicle headlights, and will not be elaborated here.

[0022] Firstly, please refer to Figure 1-4The present invention provides a composite light distribution LED lamp 10, including a heat dissipation housing 1, an optical path structure 2, a rotating mechanism 3, an environmental detection unit 4, and a control unit 5.

[0023] In this embodiment, the heat dissipation housing 1 is a die-cast aluminum housing with heat dissipation fins, and an internal receiving cavity 12 with a light outlet 11 at one end is formed. The bottom of the heat dissipation housing 1 is provided with a connecting seat for connecting to the movable end of the rotating mechanism 3. The outer surface of the heat dissipation housing 1 is provided with a finned heat dissipation structure to quickly dissipate the heat generated by the optical path structure 2 into the outside air.

[0024] Furthermore, the optical path structure 2 is installed within the receiving cavity 12, including a focusing component 21 and a projection component 22. The focusing component 21 is installed in the middle of the heat dissipation housing 1 to form a focusing optical path; the projection components 22 are distributed on both sides of the focusing component 21, such as... Figure 1 As shown, there are two light-projecting components 22, located above and below the light-concentrating component 21, respectively, for forming a diffused light path. The light-concentrating and diffused light paths work together to form a batwing-shaped composite light spot, which includes a central illumination area provided by the light-concentrating light path and two wing-shaped illumination areas provided by the diffused light path.

[0025] Understandably, the focusing component 21 and the projection component 22 are physically independent of each other, each with its own independent light source driving circuit, enabling the control unit 5 to independently adjust the brightness ratio of the two light paths. This physically separated dual-light path structure provides an optical basis for subsequent beam pattern-rotation coordinated control.

[0026] Furthermore, the movable end of the rotating mechanism 3 is connected to the heat sink housing 1 to drive the heat sink housing 1 to rotate. The environmental detection unit 4 is used to acquire environmental detection signals. The control unit 5 is electrically connected to the focusing assembly 21, the projection assembly 22, the rotating mechanism 3, and the environmental detection unit 4, and is used to adjust the brightness ratio of the focusing light path and the diffused light path and the rotation angle of the rotating mechanism 3 according to the environmental detection signals, so that the illuminance of the diffused light path increases with the increase of the horizontal rotation angle of the rotating mechanism 3, and the illuminance of the focusing light path decreases accordingly. The brightness ratio refers to the ratio of the driving power of the focusing light path and the diffused light path, or the ratio of the luminous flux of the two paths. By synchronously adjusting the brightness ratio of the focusing light path and the diffused light path through the control unit 5, and driving the rotating mechanism 3 to rotate the heat sink housing 1, when the vehicle turns, the rotation mechanism 3 can actively deflect the illumination direction to compensate for the blind spot on the inside of the curve, and can also enhance the side illumination range by increasing the brightness ratio of the diffused light path. At the same time, by reducing the brightness of the focusing light path, the total luminous flux is kept basically constant, avoiding visual discomfort caused by sudden brightness changes. This achieves dynamic adaptive reconstruction of the lighting pattern and illumination direction, effectively solving the problems of blind spot and illumination offset caused by the fixed light pattern of existing lamps.

[0027] Understandably, control unit 5 can be an in-vehicle embedded controller, an explosion-proof PLC, or an ARM industrial control board. The specific choice depends on the computing requirements and the electromagnetic compatibility requirements of the vehicle.

[0028] It should be noted that, in the statement that the illuminance of the diffused light path on the same side of the horizontal rotation direction of the rotating mechanism increases with the increase of the rotation angle, "same side" refers to the side of the illumination spot relative to the vehicle's direction of travel. For example, when the vehicle turns left, the brightness of the left elliptical light spot projected by the upper projection component is increased.

[0029] In one embodiment, please refer to Figure 1-4 The focusing assembly 21 includes several focusing lamp cups 211 and several focusing lamp beads 212. The focusing lamp cups 211 are arranged in a horizontal row, and the focusing lamp beads 212 are installed one-to-one inside the focusing lamp cups 211. The focusing lamp cups 211 are visible from the front of the light outlet 11 of the heat dissipation housing 1. The light emitted by the focusing lamp beads 212 is focused by the focusing lamp cups 211 and then emitted forward, forming a circular light spot 213 at a preset distance.

[0030] Furthermore, the projection assembly 22 includes a middle component 221, projection lamp cups 222, and projection lamp beads 223. Multiple projection lamp cups 222 are positioned on both sides of the middle component 221, arranged in a horizontal row. One row is arranged on the upper side and the lower side of the middle component 221. Projection lamp beads 223 are installed on both sides of the middle component 221 and are arranged correspondingly to the projection lamp cups 222. The middle component 221 obscures the projection lamp beads 223 and projection lamp cups 222, making them invisible from the front of the light outlet 11. After being distributed by the projection lamp cups 222, the light is emitted forward from the upper and lower sides of the middle component 221. The light spots projected by the two sets of projection lamps on the upper and lower sides combine in space to form an elliptical light spot 224. The two projection assemblies 22, together with the circular light spot 213 projected by the focusing assembly 21, form a batwing-shaped composite light spot.

[0031] Understandably, the spotlight cup 211, floodlight cup 222, and intermediate component 221 can be integrally injection molded from high-temperature resistant plastic (PC / PBT) to ensure the relative positional accuracy between the optical components and reduce the impact of assembly errors on the consistency of light distribution. The integral molding structure can also simplify the assembly process and improve production efficiency.

[0032] In one embodiment, please refer to Figure 1-4The lighting fixture also includes a main lamp plate 23, on which an extension lamp plate 231 extends vertically to the inside of the intermediate member 221. The main lamp plate 23 is installed inside the heat dissipation housing 1, a spotlight bulb 212 is installed on the main lamp plate 23, and a floodlight bulb 223 is installed on the extension lamp plate 231. One intermediate member 221 corresponds to two extension lamp plates 231, and a notch 232 is formed between the two corresponding extension lamp plates 231. The heat dissipation housing 1 is provided with a heat dissipation block 13 embedded in the notch 232, and the two sides of the heat dissipation block 13 are respectively attached to the two sides of the extension lamp plate 231 and integrally formed with the heat dissipation housing 1 to form an integrated heat dissipation structure.

[0033] Understandably, the main lamp board 23 and the extended lamp board 231 are made of aluminum or copper substrates, which have good thermal conductivity. The heat generated by the spotlight bead 212 during operation is transferred to the heat sink 1 via the main lamp board 23; the heat generated by the floodlight bead 223 during operation is transferred to the heat sink 13 via the extended lamp board 231, and then from the heat sink 13 to the overall fin structure of the heat sink 1. The interlocking fit between the notch 232 and the heat sink 13 allows the heat from the floodlight assembly 22 to be directly and efficiently conducted to the heat sink 1, avoiding the increased thermal resistance caused by air gaps between the lamp board and the housing in traditional structures. This effectively improves heat dissipation efficiency, making it particularly suitable for continuous operation scenarios of high-power LED lighting fixtures.

[0034] It should be noted that the heat dissipation housing 1 of the composite light distribution LED luminaire is not limited to round or square shapes. Please refer to [link / reference]. Figure 10 and Figure 11 The heat dissipation shell 1 can be circular or square, as long as it has a focusing component 21 in the middle and projection components 22 arranged on both sides of the focusing component 21 to form a composite light spot. There is no unique limitation on the number, row and column of lamp cups and lamp beads of the projection component 22; similarly, there is no unique limitation on the number, row and column of lamp cups and lamp beads of the focusing component 21.

[0035] In one embodiment, please refer to Figure 5 , Figure 6 and Figure 9The focusing light path is configured to converge and emit light at a first illumination angle α, forming a circular light spot 213 at a preset distance; the diffused light path is configured to diffuse and emit light at a second illumination angle β, forming an elliptical light spot 224 at a preset distance. The preset distance is 10m or 25m, which can be determined according to the standard test distance for vehicle lighting. The first illumination angle α is 5°-15°, and the second illumination angle β is 40°-80°. The projection components 22 are placed on the upper and lower sides of the focusing component 21. The upper projection component 22 guides the light to the left side through the light distribution design of its projection cup 222, forming a left elliptical light spot 224 at a preset distance; the lower projection component 22 guides the light to the right side through the light distribution design of its projection cup 222, forming a right elliptical light spot 224 at a preset distance. The two elliptical light spots 224 are symmetrically distributed on the left and right sides of the circular light spot 213, together forming a batwing-shaped composite light spot. In the upper projection component 22, the light-emitting axis of the projection lamp cup 222 is tilted towards the left front; in the lower projection component 22, the light-emitting axis of the projection lamp cup 222 is tilted towards the right front, so that the two sets of projection components arranged above and below form elliptical light spots on the left and right sides of the road surface, respectively.

[0036] Among them, the circular light spot 213 is elliptical with a major-to-minor axis ratio of 1:1-1.2:1, nearly circular, and its central illuminance is more than 10 times that of the edge illuminance, forming a distinct central high-brightness area, suitable for long-distance lighting. The elliptical light spot 224 has an aspect ratio of 2:1-4:1 and an illuminance uniformity ≥70%, suitable for close-range, large-area lighting. The above illuminance parameters can be measured at a test distance of 25m using a lux meter according to CIE 70 standards.

[0037] In this embodiment, to address the problem that simple superposition of focused and diffused light spots can easily lead to dark areas or abrupt changes in illuminance in the transition region, the major axis of the circular light spot 213 is arranged parallel to the major axis of the elliptical light spot 224. Two projection components 22 are positioned on either side of the focusing component 21, and the two elliptical light spots 224 extend from their waists towards the center, overlapping with the circular light spot 213. The circular light spot 213 is positioned at the center of the overlapping region. This arrangement ensures that the waist region of the elliptical light spot 224 covers the transition attenuation region of the circular light spot 213, rather than simply being concentrically superimposed or edge-to-edge. Simultaneously, the illuminance of the elliptical light spot 224 in the overlapping region C is 10%-30% of the central illuminance of the circular light spot 213 and not lower than the edge illuminance of the circular light spot 213, thus filling the illuminance depression at the edge of the circular light spot 213 and connecting with the edge illuminance of the focused light spot, avoiding transitional dark areas.

[0038] Understandably, the major axis of the circular light spot 213 is arranged parallel to the major axis of the elliptical light spot 224, with the two elliptical light spots 224 symmetrically positioned on either side of the circular light spot 213. The middle section of the major axis of the elliptical light spot 224 extends towards the center of the circular light spot 213. Since the illuminance uniformity of the elliptical light spot 224 is ≥70%, its waist region maintains relatively uniform and sufficiently high illuminance within the overlapping area, precisely filling the low-illuminance area formed by the sharp attenuation at the edge of the circular light spot 213, thereby avoiding the generation of transitional dark areas.

[0039] Understandably, by limiting the specific geometric parameters of circular and elliptical light spots and their arrangement with parallel major axes and overlapping waists, the technical problem of illuminance depression or dark areas in the transition region when the focusing and diffused light spots of existing combined light cups are simply superimposed can be solved, thus realizing a continuous composite light field without dark areas and effectively improving the continuity of illumination.

[0040] Furthermore, the reflective surface of the spotlight cup 211 has its origin at the vertex of the parabola, with the z-axis along the light emission direction of the cup, and the x and y axes perpendicular to the z-axis. Its sag is defined by the following formula:

[0041] Among them, the first item The equation for the sag of a standard paraboloid of revolution is given.

[0042] The corresponding point light source is located at the focal point. When reflected light is emitted in parallel, it is the classic reference surface shape of a focusing reflector. (Second item) As an aberration correction term, since LED light sources are not ideal point light sources but rather extended light sources with a certain extended area, the standard parabolic surface will produce aberrations, leading to a decrease in the parallelism of the emitted light. Therefore, an aberration correction term is introduced to compensate for this.

[0043] Defined by XY polynomials or Zernike polynomials. The general form of an XY polynomial is: ,in The coefficients are polynomials, optimized using optical tracing software (LightTools, TracePro) to ensure that the parallelism error of the light rays reflected from the reflective surface is ≤0.5°. This aberration correction term is suitable for precision machining of metal substrates or high-precision injection molding processes. Focal length The value range is 8mm-20mm, which is suitable for the focusing design of small and medium power LED beads and can achieve narrow-angle focusing of 5°-15° within a limited space depth.

[0044] Understandably, aberration correction improves focusing accuracy. The standard parabolic ray irradiation assumes the light source is an ideal point source, while actual LEDs are extended light sources, leading to diffused reflected light and blurred beam edges. Introducing XY or Zernike polynomial aberration correction terms compensates for the actual size and position of the LED's emitting surface, controlling the parallelism error to ≤0.5°. This results in a clearly defined, centrally concentrated circular beam at 25m, effectively improving long-distance illumination. Furthermore, it enables efficient narrow-angle focusing within a limited space. The focal length f is limited to 8mm-20mm, accommodating the light distribution needs of small and medium-power LEDs while allowing for optical layout within the limited depth of the heat sink housing 1's cavity 12.

[0045] It should be noted that the spotlight cup 211 can be made of metal substrate through precision stamping or CNC machining, with a high reflectivity silver or aluminum film coated on the surface; or it can be made of high temperature resistant plastic injection molding followed by vacuum coating.

[0046] Furthermore, the projection surface of the floodlight cup 222 is characterized by NURBS parametric modeling. When the weight is 1, its standard B-spline surface equation is:

[0047] in, and They are respectively direction and Direction Subsequent The B-spline basis functions are defined by the Cox-deBoor recursive formula; The coordinates of the control points are the core design parameters of the NURBS surface. In this embodiment, all control points have a weight of 1, i.e., a uniformly weighted B-spline surface is used. The NURBS freeform surface can be realized through multi-axis CNC machining or precision injection molding.

[0048] It should be noted that this embodiment is limited to That is, the order of the NURBS surface must be at least 3, which is to ensure that the surface has The fundamental requirement of continuity (curvature continuity). In the design of optical freeform surfaces, Continuity ensures that light is smoothly deflected in the transition area of ​​the curved surface, avoiding abrupt changes in illuminance and glare.

[0049] Understandable, control point coordinates The parameters are not arbitrarily set, but rather obtained through optical reverse tracing. The specific design method is as follows: using the target astigmatism angle β (40°-80°) as the boundary condition, constraints are established on the exit directions of multiple sampled rays emitted from the LED light source after deflection by the projection surface; the coordinates of the control points are iteratively adjusted using a nonlinear optimization algorithm (genetic algorithm, particle swarm optimization, or gradient descent) to minimize the root mean square error between the actual exit angle of all sampled rays and the target astigmatism angle. This design method is maturely applied in the field of freeform surface optics. Those skilled in the art can implement the corresponding projection cup design by following the guidance in this specification and using well-known optical design software.

[0050] By characterizing the projection surface of the floodlight cup using a NURBS freeform surface, asymmetric wide-angle light distribution and high illuminance uniformity can be flexibly achieved. Traditional spherical or cylindrical optical elements can only produce symmetrical light patterns, making it difficult to simultaneously meet the composite requirements of 40°-80° wide-angle astigmatism, 2:1-4:1 elliptical boundaries, and ≥70% illuminance uniformity. The NURBS freeform surface allows for independent adjustment of control point coordinates... , can , By establishing different curvature distributions in two parameter directions, the difference in the diffusion angle of light in the horizontal and vertical directions is precisely controlled, thereby achieving the shaping of an asymmetric elliptical light spot and the maintenance of uniform illumination at the waist in one step. This provides an optical basis for subsequent waist-level overlap with a circular light spot. Continuous curvature avoids abrupt changes in illuminance and glare. Order This ensures that the projected light surface has [properties] at the transition point of the control point grid. Continuity, meaning the curvature of the surface does not change abruptly. For high-brightness point light sources like LEDs, if the curvature of the optical surface is discontinuous, it will cause a sharp deflection of the light direction at a certain angle, forming local illuminance peaks or dark spots. The continuous NURBS / B spline surface shape allows for a smooth transition of light deflection angle, ensuring uniform illuminance distribution at the waist of the elliptical spot 224. It also achieves a stepless connection with the edge of the circular spot 213 in the overlapping area, fundamentally eliminating the risk of transitional dark areas and glare.

[0051] Understandably, the floodlight cup 222 can be integrally injection molded from a light-transmitting material (PC, PMMA). In this case, the light from the floodlight beads 223 undergoes a combination of refraction and total internal reflection on the projection surface before being guided to the light outlet. Alternatively, it can be formed by coating a reflective film on a metal substrate surface, in which case the light is mainly reflected on the projection surface. Regardless of the specific optical mechanism used, the core function of the floodlight cup 222 is to distribute the side-incident light to a preset astigmatism angle range through its free-form surface shape, thereby forming an elliptical light spot with specific geometric boundaries and illuminance distribution.

[0052] In one embodiment, please refer to Figure 1-4 The rotating mechanism 3 is installed on one side of the heat sink 1, and its movable end is connected to the heat sink 1 to drive the heat sink 1 to rotate. The rotating mechanism 3 includes a horizontal rotation drive assembly 31, a pitch rotation drive assembly 32, and an angle feedback assembly 33.

[0053] The horizontal rotation drive assembly 31 drives the heat sink housing 1 to rotate horizontally around the vertical axis within a range of ±15° to ±45°. The pitch rotation drive assembly 32 drives the heat sink housing 1 to pitch around the horizontal axis within a range of -10° to +15°. The angle feedback assembly 33 provides real-time feedback of the current rotation angle to the control unit 5. The pitch rotation drive assembly 32 is mounted on the movable end of the horizontal rotation drive assembly 31 and rotates horizontally along with the heat sink housing 1. The heat sink housing 1 is rotatably connected to the movable end of the horizontal rotation drive assembly 31 and connected to the movable end of the pitch rotation drive assembly 32, which drives the heat sink housing 1 to pitch.

[0054] Understandably, slip rings or flexible cabling are used for wiring at each rotating joint to ensure that power and signal lines do not become tangled during rotation. The horizontal rotation drive assembly 31 can use a stepper motor or a DC servo motor with a worm gear reducer or a harmonic reducer; the pitch rotation drive assembly 32 can use a stepper motor with a gear set or a planetary reducer; the angle feedback assembly 33 can use a magnetic encoder or a Hall sensor, which are installed one-to-one with the horizontal rotation drive assembly 31 and the pitch rotation drive assembly 32 to detect the horizontal rotation angle and the pitch tilt angle. These are all existing mature devices and will not be described in detail here.

[0055] In one embodiment, please refer to Figure 7 The control unit 5 controls the horizontal rotation drive assembly 31 to align with the steering wheel direction based on the vehicle steering signal, and the rotation angle has a non-linear mapping relationship with the steering wheel angle. Specifically, when the steering wheel is turned at a small angle, the horizontal rotation angle of the lamp has a larger gain relative to the steering wheel angle to improve response sensitivity; when the steering wheel is turned at a large angle, the gain gradually decreases and saturates to avoid excessive lamp rotation leading to light pattern distortion. The control unit 5 also controls the pitch rotation drive assembly 32 to perform real-time compensation based on the vehicle pitch angle signal to maintain the stable illumination direction of the light outlet 11 of the heat sink housing 1 and suppress illumination offset when the vehicle is going uphill or downhill.

[0056] Furthermore, the environmental detection unit 4 includes an ambient light sensor, a temperature sensor module, an inertial measurement module, a vehicle speed interface, and a steering angle interface. Environmental detection signals include one or more of the following: ambient illuminance, vehicle speed, steering angle, and vehicle attitude. The ambient light sensor detects external illuminance (0.1 Lux-100 kLux) to determine day / dusk / night; the temperature sensor module detects the temperature of the lamps or the lamp panel; the inertial measurement module (IMU) detects the pitch / roll angle of the lamps themselves; and the vehicle speed and steering angle interfaces acquire vehicle signals via a CAN bus or LIN bus.

[0057] Furthermore, the feedback detection unit 6 includes a light feedback sensing module 61 and a temperature sensing module 62. The light feedback sensing module 61 is a photoresistor or photodiode, equipped with an ambient light shielding structure and located at the light outlet 11 of the heat sink housing 1. It is equipped with a narrow-band filter or uses a modulation detection method synchronized with the LED driving frequency to suppress ambient light interference, and is used to detect the actual light output intensity emitted through the optical path structure 2. The control unit 5 corrects the brightness ratio according to the deviation between the actual light output intensity and the target light output intensity, forming a photoelectric feedback closed loop.

[0058] Furthermore, the control unit 5 is an embedded controller, electrically connected to the focusing component 21, the projection component 22, the rotating mechanism 3, the environmental detection unit 4, and the feedback detection unit 6. The control unit 5 includes a beam pattern-rotation coordinated control module 51 and a thermal management module 52. These modules are either software functional modules running on the embedded controller or hardware co-processing modules invoked by the embedded controller. Specifically, the beam pattern-rotation coordinated control module 51 is used to simultaneously calculate the brightness ratio adjustment of the focusing and diffused light paths, as well as the target rotation angle of the rotating mechanism 3, based on the steering angle and vehicle speed in the environmental detection signal.

[0059] For example, when the vehicle turns left at a speed of 40 km / h with a steering wheel angle of 20°, the control unit 5 can drive the horizontal rotation drive assembly 31 to rotate 12° to the left. Simultaneously, it increases the brightness ratio of the diffused light path from a baseline of 30% to 55%, and decreases the brightness of the focused light path from a baseline of 70% to 45%, ensuring that the total drive power remains essentially constant and the total light output remains relatively stable after optical feedback closed-loop correction. At this time, the elliptical light spot 224 expands towards the inside of the curve, compensating for the lag of the mechanical rotation; at the same time, the center of the circular light spot 213 shifts to the left and converges moderately, avoiding glare from oncoming lanes.

[0060] Specifically, when the luminaire rotates horizontally, the projection positions of the circular light spot 213 and the elliptical light spot 224 on the ground shift synchronously. If the brightness is adjusted independently without considering the rotation angle, the illuminance ratio of the overlapping area will change, resulting in the destruction of the uniformity of the composite light field. Through a preset positive correlation relationship, as the rotation angle increases, the diffuse light brightness is increased proportionally and the focused light brightness is decreased, so that the illuminance of the overlapping area is always maintained at 10%-30% of the illuminance at the center of the circular light spot and not lower than the illuminance at the edge of the circular light spot, thereby maintaining the continuity of the composite light field.

[0061] Furthermore, the thermal management module 52 is used to reduce the drive current or switch to a low-power mode when the temperature exceeds a threshold, based on the signal from the temperature sensing module 62, in order to protect the LED light source and electronic components.

[0062] Secondly, the present invention also provides a control method, please refer to [link to relevant documentation]. Figure 8 The control method is executed by the control unit in the above embodiments and is applied to the composite light distribution LED lamps described in any of the above embodiments. The control method acquires environmental detection signals, simultaneously calculates the brightness ratio of the focusing light path and the diffused light path, and the target rotation angle of the rotating mechanism. This causes the brightness of the diffused light path on the turning direction side to increase with the increase of the rotation angle, while the brightness of the focusing light path decreases accordingly. Furthermore, it collects light output intensity and temperature in real time for feedback correction, achieving dynamic adaptive reconstruction of the lighting pattern and illumination direction. The method includes the following steps.

[0063] S1. Acquire environmental detection signals, including one or more of ambient illuminance, vehicle speed, steering angle, and vehicle attitude.

[0064] S2. Based on the environmental detection signal, calculate the brightness ratio adjustment of the focusing optical path and the diffused optical path, as well as the target rotation angle of the rotating mechanism.

[0065] Specifically, control unit 5 has a pre-stored scene-parameter lookup table, which includes at least the following: High-speed scenario: vehicle speed > 60km / h, the brightness ratio of the focused light path ≥ 80%, and the rotating mechanism remains at zero position; Low-speed / steering scenarios: vehicle speed <30km / h or steering angle >15°, the brightness of the diffused light path ≥70%, and the horizontal rotation angle and steering angle have a non-linear mapping relationship; In oncoming traffic scenarios: When an oncoming light source is detected, reduce the brightness ratio of the focusing light path to avoid oncoming glare.

[0066] S3. Adjust the driving parameters of each optical path according to the brightness ratio adjustment amount, so that the illuminance of the diffuse optical path increases with the increase of the horizontal rotation angle of the rotating mechanism, and the illuminance of the focusing optical path decreases accordingly.

[0067] Specifically, control unit 5 outputs a PWM dimming signal (frequency ≥200Hz to avoid flicker) or a constant current dimming signal to independently control the drive current of spotlight bulb 212 and floodlight bulb 223. While increasing the brightness ratio of the diffused light path, it reduces the brightness of the spotlight path, keeping the total drive power of the batwing-shaped composite light spot basically constant. After feedback closed-loop correction, the total light output remains relatively stable, avoiding sudden changes in total brightness that could cause visual discomfort to the driver.

[0068] S4. Control the rotation mechanism to dynamically adjust the orientation of the heat sink housing according to the target rotation angle.

[0069] S5. Real-time acquisition of the actual light output intensity and lamp temperature of the focusing and diffused light paths; correction of the brightness ratio based on the deviation between the actual and target light output intensities; correction of the driving parameters based on the lamp temperature; and return to step S1. The correction amount for the brightness ratio is subject to a limiting threshold and low-pass filtering. The corrected brightness ratio still satisfies the linkage relationship where the diffused light path increases with increasing rotation angle, while the focusing light path decreases accordingly, to avoid control oscillations with the environmental signal calculation results.

[0070] Understandably, the light feedback correction in step S5 employs a proportional-integral-derivative (PID) control algorithm. The target light output intensity is used as the setpoint, and the actual light output intensity detected by the light feedback sensor module 61 is used as the feedback value. After calculating the deviation, the PWM duty cycle is adjusted to ensure the actual light output quickly tracks the target value without overshoot. Temperature correction uses a lookup table method, pre-storing the maximum allowable drive current values ​​for different temperature ranges. When the temperature exceeds the threshold, the current is gradually reduced to the upper limit of the corresponding range. The drive parameters of the spotlight and floodlight beads are adjusted according to the lamp temperature.

[0071] It should be noted that the steps in the above control method do not necessarily have to be executed in strict order. For example, steps S3 and S4 can be executed simultaneously or partially overlapped, that is, brightness adjustment and rotation can be performed at the same time to shorten the response time. The operation cycle of control unit 5 is ≤50ms, ensuring that the dynamic response of the lighting system can keep up with changes in operating conditions when the vehicle is traveling at high speed.

[0072] Compared with existing technologies, the composite light distribution LED lamp provided by this invention integrates the spotlight cup and the floodlight cups placed on both sides of the middle part into the same heat dissipation housing, forming a composite light path structure with central focusing and side diffused light. This allows the elliptical light spot to cover the edge transition area of ​​the circular light spot, effectively eliminating the illuminance depression at the junction of the focused and diffused light spots and solving the problem of dark transition areas. The control unit synchronously adjusts the brightness ratio of the focused light path and the diffused light path according to the environmental detection signal and drives the rotating mechanism to rotate the heat dissipation housing. When the vehicle turns, the rotating mechanism can actively deflect the illumination direction to compensate for the blind spot on the inside of the curve, and can also enhance the side illumination range by increasing the brightness ratio of the diffused light path. At the same time, by reducing the brightness of the focused light path and keeping the total driving power basically constant, the total light output remains relatively stable after feedback closed-loop correction, avoiding visual discomfort caused by sudden brightness changes. Furthermore, the rotating mechanism can also perform pitch compensation according to the vehicle body posture, effectively suppressing the illumination deviation when driving on slopes, and effectively improving the lighting adaptability and continuity under complex working conditions.

[0073] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A composite light distribution LED luminaire, characterized in that, include: Heat dissipation housing; An optical path structure includes a focusing component and a projection component, both of which are installed inside the heat dissipation housing. The focusing component is used to form a focusing optical path, and the projection components are placed on both sides of the focusing component to form a diffused optical path. A rotating mechanism, the movable end of which is connected to the heat dissipation housing, drives the heat dissipation housing to rotate; An environmental detection unit is used to acquire environmental detection signals; as well as The control unit is electrically connected to the focusing component, the projection component, the rotating mechanism, and the environmental detection unit. It is used to synchronously adjust the brightness ratio of the focusing light path and the diffused light path according to the environmental detection signal and drive the rotation angle of the rotating mechanism so that the illuminance of the diffused light path on the same side as the horizontal rotation direction of the rotating mechanism increases with the increase of the rotation angle, and the illuminance of the focusing light path decreases accordingly. The focusing component includes several spotlight cups and several spotlight beads. The spotlight beads are installed one-to-one inside the spotlight cups to project a circular light spot. The projection component includes a middle component, spotlight cups, and spotlight beads. The spotlight cups are placed on both sides of the middle component, and the spotlight beads are installed on both sides of the middle component and arranged one-to-one with the spotlight cups to project an elliptical light spot. The light spots projected by two projection components and the focusing component form a batwing-shaped composite light spot.

2. The composite light distribution LED luminaire according to claim 1, characterized in that, It also includes a main lamp board, which has an extension lamp board extending vertically to the inside of the intermediate component. The main lamp board is installed inside the heat dissipation housing. The spotlight lamp is installed on the main lamp board, and the floodlight lamp is installed on the extension lamp board. Each intermediate component corresponds to two extension lamp boards, and a notch is formed between the two corresponding extension lamp boards. The heat dissipation housing has a heat dissipation block embedded in the notch, which is used to fit the extension lamp board and form an integral heat dissipation structure with the heat dissipation housing.

3. The composite light distribution LED luminaire according to claim 1, characterized in that, The focusing optical path is configured to converge and emit light at a first illumination angle α, forming the circular light spot at a preset distance; the diffuser optical path is configured to diffuse and emit light at a second illumination angle β, forming the elliptical light spot at the preset distance; the first illumination angle α is 5°-15°, and the second illumination angle β is 40°-80°.

4. The composite light distribution LED luminaire according to claim 3, characterized in that, The circular light spot is elliptical, with a major axis to minor axis ratio of 1:1-1.2:1, and the central illuminance is more than 10 times the edge illuminance; the aspect ratio of the elliptical light spot is 2:1-4:1, and the illuminance uniformity is ≥70%; the major axis of the circular light spot is parallel to the major axis of the elliptical light spot, and two elliptical light spots extend from the waist towards the middle and overlap with the circular light spot, with the circular light spot placed at the center of the overlapping area; the waist area of ​​the elliptical light spot covers the transition attenuation area of ​​the circular light spot, so that the illuminance of the elliptical light spot in the overlapping area is 10%-30% of the central illuminance of the circular light spot, and not lower than the edge illuminance of the circular light spot, in order to fill the illuminance depression.

5. The composite light distribution LED luminaire according to claim 2, characterized in that, It also includes a feedback detection unit, which comprises a light feedback sensing module and a temperature sensing module. The light feedback sensing module is disposed at the light outlet of the heat dissipation housing and is used to detect the actual light output intensity emitted through the light path structure. The temperature sensing module is installed inside the heat dissipation housing and is used to detect the temperature of the lamp and / or the temperature of the lamp panel. The control unit is also electrically connected to the feedback detection unit and is used to correct the brightness ratio according to the deviation between the actual light output intensity and the target light output intensity, and to correct the driving parameters of the focusing component and the projection component according to the lamp temperature.

6. The composite light distribution LED luminaire according to claim 5, characterized in that, The control unit includes: The light pattern-rotation coordinated control module is used to synchronously calculate the brightness ratio adjustment amount of the focusing light path and the diffused light path, as well as the target rotation angle of the rotating mechanism, based on the steering angle and vehicle speed in the environmental detection signal. The thermal management module is used to reduce the drive current or switch to a low-power mode when the temperature exceeds a threshold, based on the lamp temperature signal.

7. The composite light distribution LED luminaire according to claim 1, characterized in that, The rotating mechanism includes a horizontal rotation drive component, a pitch rotation drive component, and an angle feedback component. The horizontal rotation drive component is used to drive the heat sink housing to rotate horizontally around a vertical axis. The pitch rotation drive component is used to drive the heat sink housing to rotate in pitch around a horizontal axis. The angle feedback component is used to provide real-time feedback of the current rotation angle to the control unit.

8. The composite light distribution LED luminaire according to claim 1, characterized in that, The environmental detection signals include one or more of the following: ambient illuminance, vehicle speed, steering angle, and vehicle posture.

9. The composite light distribution LED luminaire according to claim 1, characterized in that, The control unit includes an on-board embedded controller, an explosion-proof PLC, or an ARM industrial control board.

10. A control method, characterized in that, The application of the composite light distribution LED luminaire as described in any one of claims 1-9 includes the following steps: S1. Acquire environmental detection signals; S2. Based on the environmental detection signal, calculate the brightness ratio adjustment amount of the focusing optical path and the diffused optical path, as well as the target rotation angle of the rotating mechanism; S3. Adjust the driving parameters of each optical path according to the brightness ratio adjustment amount, so that the illuminance of the diffuse optical path on the same side as the horizontal rotation direction of the rotating mechanism increases with the increase of the rotation angle, and the illuminance of the focusing optical path decreases accordingly. S4. Based on the target rotation angle, control the rotation mechanism to dynamically adjust the orientation of the heat dissipation housing; S5. Real-time acquisition of the actual light output intensity and lamp temperature of the focusing light path and the diffused light path; correction of the brightness ratio based on the deviation between the actual light output intensity and the target light output intensity; correction of the driving parameters based on the lamp temperature; and return to step S1.

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