Vehicle and its low beam optical system, low beam module and control method

Abstract

This invention discloses a vehicle and its low beam lighting optical system, low beam module, and control method. The low beam lighting optical system includes: a laser source for emitting excitation light; a semi-transparent mirror disposed in the light output path of the laser source, the semi-transparent mirror having a blue light filter to filter harmful blue light from the excitation light; a light distribution lens disposed in the reflected light path of the semi-transparent mirror to shape the light transmitted through the semi-transparent mirror into a low beam pattern; and a blue light detection device disposed in the transmitted light path of the semi-transparent mirror to detect the intensity of harmful blue light transmitted through the semi-transparent mirror. This invention can proactively monitor the safety status of the main illumination beam, and can trigger subsequent protective actions when the detected transmitted blue light intensity exceeds a threshold.

Description

Technical Field

[0001] This invention relates to the field of vehicle lighting technology, and in particular to a vehicle low beam headlight module, a vehicle, and a control method. Background Technology

[0002] With the rapid development of automotive lighting technology, laser low beam headlights have gradually become the mainstream solution for automotive lighting due to their advantages such as high brightness, low energy consumption, and long illumination distance. However, conventional laser light sources often contain a large amount of high-energy blue light. Excessive blue light transmittance can easily cause light pollution and irreversible visual damage to the human eye, posing a driving safety hazard. Currently, most vehicle lighting systems use independent sensors to monitor the main lighting path, which introduces additional light loss or interference with the light pattern; some solutions only monitor the original blue light at the light source end, failing to reflect the actual light output safety status. In addition, existing vehicle lighting control systems directly cut off the light source after detecting excessive blue light, which can easily lead to secondary accidents caused by poor lighting effects at high speeds. Summary of the Invention

[0003] Therefore, this invention proposes a vehicle low beam lamp optical system, low beam lamp module, and control method that can provide efficient lighting, real-time non-destructive monitoring of harmful blue light, and intelligent safety control.

[0004] To address the aforementioned technical problems, the present invention provides the following technical solution: A vehicle low beam optical system includes: a laser source for emitting excitation light; a semi-transparent mirror disposed in the light output path of the laser source, wherein a blue light filter is disposed on the semi-transparent mirror for filtering harmful blue light in the excitation light; a light distribution lens disposed in the reflected light path of the semi-transparent mirror for shaping the light transmitted through the semi-transparent mirror into a low beam pattern; and a blue light detection device disposed in the transmitted light path of the semi-transparent mirror for detecting the intensity of harmful blue light transmitted through the semi-transparent mirror.

[0005] In some embodiments of the present invention, the optical axis of the laser source is arranged vertically upward, the curved surface of the semi-transparent lens is configured to convert the incident light emitted by the laser source into outgoing light extending in the horizontal direction, and the optical axis of the light distribution lens is arranged horizontally.

[0006] In some embodiments of the present invention, the blue light detection device includes a photoelectric sensor and a bandpass filter, wherein the center wavelength of the bandpass filter is 420nm±10nm.

[0007] This invention also provides a vehicle low beam headlight module, comprising: The vehicle low beam optical system and controller described in any of the above embodiments control the power of the laser light source and the alarm signal based on the detection signal from the blue light detection device and the vehicle speed.

[0008] The present invention also provides a vehicle low beam lamp module, characterized in that it further includes a mounting assembly for the low beam lamp optical system. The mounting assembly includes a light source support, a semi-transparent mirror support, a light distribution lens support, and a blue light detection support. The light source support, the semi-transparent mirror support, and the blue light detection support are connected to form a first mounting assembly. The light distribution lens support and the first mounting assembly are each mounted on the vehicle lamp mounting bracket by fastening assemblies.

[0009] In some embodiments of the present invention, the light source support is constructed as a shell structure with an open top. The upper surface of the base plate of the light source support has a mounting protrusion matching the shape of the laser light source, and the laser light source is connected to the mounting protrusion via a fastening assembly. The semi-transparent lens support is connected to the front region of the light source support, extends upward in a curved shape, and has a formed insertion groove. The semi-transparent lens has a curved surface region and a flat surface region. The curved surface region of the semi-transparent lens is inserted into the insertion groove of the semi-transparent lens support, and the flat surface region of the semi-transparent lens is mounted on the upper surface of the semi-transparent lens support. The blue light detection support is constructed as a shell structure with a semi-enclosed front side, which is connected to the upper side of the semi-transparent lens support and surrounds and covers the semi-transparent lens inside. The blue light detection device is installed on the inner side of the top wall of the blue light detection support.

[0010] In some embodiments of the present invention, the lens support is constructed as a housing structure with a mounting cavity on the rear side, and the front side of the lens support is provided with a snap-fit ​​groove suitable for connecting the lens; the first mounting assembly is located inside the mounting cavity of the lens support, and the mirror surface area of ​​the lens covers the light-emitting surface of the reflector.

[0011] In some embodiments of the present invention, a heat dissipation assembly for dissipating heat from the laser light source is further included. The heat dissipation assembly includes a heat conduction component and a heat convection component. The heat conduction component is a light source support member, and the heat convection component is a cooling fan installed on the lower side of the support member.

[0012] In some embodiments of the present invention, the mounting protrusion is located in the front region of the light source support member, and the light source support member is provided with heat dissipation fins around the mounting protrusion; the rear region of the light source support member is provided with a plurality of heat dissipation holes arranged in a matrix, and heat dissipation fins are provided on the lower side between adjacent rows of heat dissipation holes, and the cooling fan is mounted in the lower region of the heat dissipation fins.

[0013] The present invention also provides a vehicle, including a vehicle body and a low beam lighting optical system as described in any of the above embodiments, or a low beam lamp module as described in any of the above embodiments, mounted on the front of the vehicle body.

[0014] The present invention also provides a control method for the vehicle low-beam light module according to any one of the above embodiments, including the following steps: Obtain the intensity B of harmful blue light transmitted through the half lens and the driving speed v of the vehicle in real time; Judge whether the intensity B of harmful blue light exceeds a preset safety threshold B safe ; When B exceeds B safe , perform the following operations according to the driving speed v and the speed change trend of the vehicle: If v≥V1, send an alarm signal and control the emission power of the laser light source to remain unchanged; If V2≤v<V1, send an alarm signal and control the emission power of the laser light source to be reduced to 50% - 80% of the rated power; If v<V2 and the vehicle is in a decelerating process, send an alarm signal and control the emission power of the laser light source to be reduced to 20% - 50% of the rated power; [[ID=**19**]]If v<V2 and the vehicle is in an accelerating process, send an alarm signal and cut off the laser light source; Wherein, V1 and V2 are preset speed thresholds, and V2<V1.

[0015] In some embodiments of the present invention, if v<V2 and the vehicle is in an accelerating process, the method further includes: controlling the auxiliary lighting device on the same side as the turned-on and -off low-beam light module, and the auxiliary lighting device includes a front fog lamp or a corner lamp.

[0016] In some embodiments of the present invention, when v≥V1 and the duration of B exceeding B safe exceeds a preset time threshold T hold , control the emission power of the laser light source to be reduced to 50% - 80% of the rated power.

[0017] In some embodiments of the present invention, it further includes a self-check start step: when the low-beam light module is powered on and started or woken up from the sleep state each time, first light the laser light source at 10% of the rated power for 0.5 seconds, and detect the intensity B of harmful blue light at this time self ; If B self ≤B normal , where B normal is the preset upper limit of normal blue light intensity and B normal <B safe , switch to the normal working mode; [[ID=4**9**]] If B normal <B self <B safe , then control the emission power of the laser light source to be 30% of the rated power and send an alarm signal; Note: There seems to be some inconsistent or incorrect tags in the original text, such as the repeated use of some tags in a way that might be an error in the source format. I've translated it as accurately as possible while maintaining the integrity of the provided text structure. Also, I've corrected the spelling of "auxiliary" in one place in the translation for better readability.If B self ≥B safe If the laser light source is not activated, an alarm signal will be issued.

[0018] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory, characterized in that the processor executes the computer program to implement the steps of the control method for the vehicle low beam lamp module described in any of the above embodiments.

[0019] The technical solution of the present invention has the following technical effects compared with the prior art: The vehicle low beam lighting optical system, low beam module, and control method provided by this invention achieve real-time online monitoring of harmful blue light leakage by setting a blue light detection device on the transmission side of the semi-transparent mirror. This allows for real-time monitoring of the safety status of the main illumination beam, and when the intensity of transmitted blue light exceeds a threshold, subsequent protective actions can be triggered to ensure that the laser low beam system meets photobiological safety standards throughout its entire lifecycle.

[0020] The vehicle low beam headlight module control method provided by this invention dynamically correlates the blue light safety response with vehicle speed and its changing trend, achieving dynamic hierarchical control. This realizes control logic of maintaining illumination at high speeds, moderately reducing power at medium speeds, reducing power at low speeds, and cutting off power upon starting. This not only meets the basic requirements for human eye safety protection but also minimizes the adverse effects of faulty lighting on driving safety. Simultaneously, continuous alarms alert the driver, ensuring timely detection and handling of faults. Attached Figure Description

[0021] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein: Figure 1 This is a schematic diagram of the vehicle low beam optical system provided in Embodiment 1 of the present invention; Figure 2 A control system configuration diagram of a vehicle low beam headlight module is provided for Embodiment 2 of the present invention; Figure 3 A structural diagram of the installation components for a vehicle low beam headlight module is provided for Embodiment 2 of the present invention; Figure 4 A structural diagram of the first mounting component of the vehicle low beam lamp module is provided for Embodiment 2 of the present invention; Figure 5 Another structural diagram of the mounting assembly for the vehicle low beam headlight module is provided for Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the structure of the light source support and heat dissipation component of the vehicle low beam lamp module provided in Embodiment 2 of the present invention. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Example 1 like Figure 1 The image shown is a vehicle low beam optical system provided in this embodiment 1, which includes a laser light source 100, a semi-transparent mirror 200, a lens 300, and a blue light detection device 400.

[0027] The laser source 100 is used to generate a high-brightness white light illumination beam. The laser source unit includes at least one semiconductor laser diode and a corresponding fluorescence conversion element. The semiconductor laser diode emits blue excitation light of a specific wavelength (typically 440 nm to 460 nm), which illuminates the surface of the fluorescence conversion element with high energy density. The fluorescence conversion element contains a yellow or yellow-green fluorescent material. After the blue excitation light is absorbed by the fluorescent material, a Stokes shift occurs, emitting yellow fluorescence with a peak wavelength of approximately 550 nm to 570 nm. The unabsorbed remaining blue light mixes with the yellow light emitted by the fluorescent material in an appropriate proportion to form a white light output with a suitable color temperature. The output port of the laser source 100 may be equipped with a collimating lens to compress its divergence angle to a smaller range (e.g., less than 5°), forming an approximately parallel excitation beam, which is then incident on the semi-transparent mirror 200.

[0028] A semi-transparent mirror 200 is positioned in the output optical path of the laser source 100. The semi-transparent mirror 200 is an optical element with partial transmission and partial reflection characteristics, and its surface is coated with a blue light filter. This blue light filter, through the principle of interference filtering, exhibits high absorption characteristics for harmful blue light in the wavelength range of 400nm–450nm, while exhibiting high transmission characteristics for other visible light bands. The function of the semi-transparent mirror 200 is to split the incident light beam into two paths: one is transmitted light, and the other is reflected light. The reflected light serves as the main illumination beam entering the subsequent optical system; the transmitted light is used for safety monitoring (detection of harmful blue light). It should be noted that the transmission / reflection splitting ratio of the semi-transparent mirror 200 can be optimized according to design requirements. For example, for harmful blue light components, the transmittance can be set to 80%–95%, and the reflectance to 5%–20%. That is, most of the harmful blue light transmits through the semi-transparent mirror 200 into the detection optical path, with only a small portion reflected back to the illumination optical path. For other visible light bands, the transmittance can be set to 5%–15%, and the reflectance to 85%–95%. That is, most of the useful light is reflected to the illumination light path to ensure illumination efficiency, and only a small portion is transmitted into the detection light path.

[0029] The lens 300 is mounted on the reflected light path of the semi-transparent mirror 200, receiving the light reflected by the semi-transparent mirror 200. The lens 300 is used to shape the reflected light into a near-light pattern. The lens 300 is typically injection-molded from transparent optical plastic, and its inner or outer surface has microstructures, including but not limited to prism units, cylindrical lens arrays, and freeform surface regions. These microstructures can redistribute the emitted light beam from the semi-transparent mirror 200, forming a near-light pattern with bright and dark cutoff lines, meeting regulatory requirements for near-light illuminance distribution.

[0030] The blue light detection device 400 is installed in the transmission light path of the semi-transparent mirror 200, specifically on the side of the semi-transparent mirror 200 away from the laser source 100 and in the direction of the transmission beam's emission. Specifically, the blue light detection device 400 is positioned in the transmission light path, with its detection probe facing the light-emitting surface (transmission surface) of the semi-transparent mirror 200 to accurately collect the amount of blue light radiation in the light transmitted through the semi-transparent mirror 200. The blue light detection device 400 is used to detect the intensity of harmful blue light in the transmitted light in real time. Since the intensity of blue light in the transmitted light and the intensity of blue light in the reflected light (i.e., the main illumination beam) follow a fixed spectral ratio, the level of harmful blue light in the main illumination beam can be indirectly and in real time determined by monitoring the intensity of blue light in the transmitted light. When harmful blue light exceeds the standard in the main illumination beam due to blue light filter failure or aging of the fluorescence conversion element, the intensity of blue light in the transmitted light will also increase proportionally, thus being captured by the blue light detection device 400.

[0031] This optical system employs a separate optical path design for reflected illumination and transmitted light monitoring. The main illumination optical path forms a near-beam pattern via a lens 300, ensuring illumination efficiency. The monitoring optical path is independent of the illumination optical path, preventing the blue light detection device 400 from introducing stray light or light loss that could affect the illumination effect. Simultaneously, by monitoring a small amount of blue light component in the transmitted light, the safety status of the main illumination beam can be monitored in real time, achieving non-invasive, highly sensitive blue light safety monitoring. When the intensity of transmitted blue light exceeds a threshold, subsequent protective actions can be triggered, ensuring that the laser near-beam system complies with photobiological safety standards throughout its entire lifecycle.

[0032] Specifically, the optical axis of the laser source 100 is vertically upward. For example, the laser source 100 is fixed to the bottom of the lamp housing, and its light emission direction is vertically upward. The curved surface of the semi-transparent mirror 200 is used to convert the incident light emitted by the laser source 100 into outgoing light extending in a horizontal direction. The semi-transparent mirror 200 not only has a filter membrane, but its base shape is designed as a curved reflective / transmitting surface. This curved surface can be a parabola, an ellipse, or a freeform surface. When the vertically upward laser beam from below is incident on the curved semi-transparent mirror 200, on the one hand, part of the light is transmitted and its direction is changed; on the other hand, the curved surface shape makes the transmitted light become parallel light or converging light in a roughly horizontal direction. The optical axis of the light distribution lens 300 extends horizontally, that is, the incident surface of the light distribution lens 300 faces the reflected light direction of the semi-transparent mirror 200, and it is horizontally arranged in front of the lamp. This vertically upward excitation and horizontally emitted layout greatly saves the longitudinal depth of the lamp in the horizontal direction, which is beneficial to the thin design of automotive lamps. Meanwhile, the laser source 100 is installed vertically, and the heat it generates can be efficiently conducted through the bottom heat sink, avoiding the problem of the heat source being far away from the heat sink substrate when installed horizontally.

[0033] Specifically, the blue light detection device 400 includes a photoelectric sensor and a bandpass filter. The photoelectric sensor can be a silicon photodiode, phototransistor, or integrated photosensitive IC, with a spectral response range covering 400nm–500nm. The bandpass filter is positioned in front of the photosensitive surface of the photoelectric sensor, with a center wavelength of 420nm ± 10nm and a full width at half maximum (FWHM) of less than 30nm. This bandpass filter only allows harmful blue light with wavelengths in the 410nm–430nm range to pass through, while exhibiting high cutoff characteristics (cutoff depth OD ≥ 3) for other wavelengths of ambient light (such as red, green, and infrared light). The photoelectric sensor array using a narrowband filter can specifically detect harmful blue light (i.e., short-wavelength blue light posing the greatest risk of retinal damage), avoiding false alarms caused by changes in the intensity of other wavelengths of light from broadband sensors.

[0034] The vehicle low beam optical system provided by this invention achieves real-time online monitoring of harmful blue light leakage by setting a blue light detection device 400 on the transmission side of the semi-transparent mirror 200. It can monitor the safety status of the main illumination beam in real time, and trigger subsequent protective actions when the intensity of transmitted blue light exceeds a threshold, ensuring that the laser low beam system meets photobiological safety standards throughout its entire lifecycle.

[0035] Example 2 This embodiment provides a vehicle low beam headlight module, which includes the vehicle low beam optical system described in Embodiment 1, and a controller 500. For example... Figure 2 As shown, the controller 500 is connected to the vehicle speed sensor, blue light detection device, alarm device, and light source driver, and controls the power of the laser light source 100 and the alarm signal based on the detection signal from the blue light detection device 400 and the vehicle speed. The controller 500 can be an independent microcontroller unit (MCU) or a control chip integrated inside the headlight or vehicle BCM. The controller 500 stores preset blue light safety thresholds, vehicle speed thresholds, and graded power control algorithms. When the harmful blue light intensity detected by the blue light detection device 400 exceeds the safety threshold, the controller 500 performs corresponding power derating or cut-off operations based on the current vehicle speed (obtained via the CAN bus), and simultaneously sends an alarm signal (e.g., a text prompt "Laser low beam system malfunction, please check") to the instrument panel via the vehicle bus (CAN / LIN) or hardwired connection. By linking blue light safety monitoring with vehicle speed for power control, a comprehensive balance is achieved between safety, lighting requirements, and vehicle dynamic characteristics, avoiding the risk of secondary accidents caused by indiscriminately cutting off lighting in case of a malfunction.

[0036] Specifically, such as Figures 3-5As shown, the low beam module also includes a mounting assembly 600 for mounting optical components. The mounting assembly 600 includes a light source support 610, a semi-transparent mirror support 620, a lens support 630, and a blue light detection support 640. The light source support 610, semi-transparent mirror support 620, and blue light detection support 640 are connected to form a first mounting assembly A. This first mounting assembly A serves as a pre-assembly unit. First, the laser light source 100, semi-transparent mirror 200, and blue light detection device 400 are fixed to their respective supports using fasteners (such as screws and clips), and their relative positions are adjusted (e.g., the distance between the laser light source 100 and the semi-transparent mirror 200, and the tilt angle of the semi-transparent mirror 200). Then, the first mounting assembly A, equipped with the optical components, is mounted as a first module unit onto the first connecting part of the headlight mounting bracket using fastening screws. Next, the lens 300 is mounted and connected to the lens support 630 to form a second module unit, which is then mounted onto the second connecting part of the headlight mounting bracket using fastening screws.

[0037] By adopting the above modular assembly design, it is easier to debug the optical components of the first module unit and the light distribution lens 300 of the second module unit separately on the production line, reducing the assembly difficulty. The first mounting component A, as an independent sub-assembly, can be precisely aligned on a dedicated tooling before being installed into the lamp as a whole, improving optical consistency and maintainability.

[0038] Specifically, in one alternative implementation, such as Figure 6 As shown, the light source support 610 has an overall shell structure with an open top, such as a rectangular groove injection-molded / die-cast from aluminum alloy or thermally conductive plastic. The upper surface of the base plate of the light source support 610 has a mounting protrusion 611 that matches the shape of the laser light source 100. The mounting protrusion 611 can be, for example, a circular or square platform with a flat and precision-machined surface. The laser light source 100 is connected to the mounting protrusion 611 by fastening components (such as screws or clamps). A thermally conductive interface material is coated between the bottom surface of the laser light source 100 and the mounting protrusion 611 to ensure efficient heat conduction.

[0039] A semi-transparent mirror support 620 is connected to the front region of the light source support 610 (with the horizontal light output direction as the front). The semi-transparent mirror support 620 extends upward in a curved shape and is formed with an insertion groove 621. Specifically, the semi-transparent mirror support 620 can be an approximately L-shaped or arc-shaped bracket, whose bottom is fixed to the front sidewall of the light source support 610 by screws, and whose upper part curves backward to form a structure with an opening groove. The semi-transparent mirror 200 has a curved surface region 201 and a flat surface region 202: the curved surface region 201 is the main optical surface used to deflect the light path, and the flat surface region 202 is the non-optical edge part of the semi-transparent mirror 200. During assembly, the curved surface region 201 of the semi-transparent mirror 200 is inserted into the insertion groove 621 of the semi-transparent mirror support 620, while the flat surface region 202 of the semi-transparent mirror 200 is installed on the upper surface of the semi-transparent mirror support 620 by adhesive or snap-fit, forming a stable three-point or surface contact.

[0040] The blue light detection support 640 is constructed as a semi-enclosed shell structure with an opening on the front, resembling an inverted cover. The blue light detection support 640 is connected to the upper side of the semi-transparent lens support 620, and surrounds and covers the semi-transparent lens 200 inside it. The blue light detection device 400 is installed on the inner side of the top wall of the blue light detection support 640, with its photosensitive window facing the light-emitting surface of the semi-transparent lens 200, and a suitable gap (e.g., 2mm to 5mm) is left between it and the semi-transparent lens 200. The semi-enclosed structure of the blue light detection support 640 simultaneously serves to prevent dust and stray light interference, allowing transmitted light to pass through while blocking ambient light from above or the side from directly entering the detector.

[0041] The lens support 630 is constructed as a housing structure with a mounting cavity on the rear side, resembling a cover with openings at both the front and rear ends. The dimensions of this mounting cavity match the overall shape of the first mounting assembly A (light source support 610, semi-transparent mirror support 620, and blue light detection support 640), allowing the first mounting assembly A to be pushed into the mounting cavity from the rear, thus ensuring the distance between the lens 300 and the semi-transparent mirror 200. The front area of ​​the lens support 630 has a locking groove 631 suitable for connecting the lens 300. The edge of the lens 300 is attached to the locking groove 631 by elastic claws or ultrasonic welding. When the first mounting assembly A is installed into the cavity of the lens support 630, the mirror surface of the lens 300 exactly covers the light-emitting surface of the semi-transparent mirror 200, and the optical axis of the lens 300 is coaxial with the output optical axis of the semi-transparent mirror 200. In addition, the front end of the lens support 630 may be provided with a sealing ring groove for installing a waterproof and breathable membrane or a sealing gasket.

[0042] The cavity design of the lens support 630 provides precise guidance and positioning for the first mounting component A, while preventing stray light leakage from the side, thus acting as a light shield. Overall, the nested assembly structure of the lens support 630 and the first mounting component A improves the module's airtightness and vibration resistance.

[0043] Specifically, in one optional embodiment, the low beam module further includes a heat dissipation assembly 700. The heat dissipation assembly 700 includes a heat conduction component 710 and a heat convection component 720. The heat conduction component 710 is the aforementioned light source support 610, meaning the light source support 610 itself is made of a material with high thermal conductivity, serving as the main heat dissipation path. The base plate, mounting protrusion 611, and sidewall of the light source support 610 are integrally formed, rapidly conducting the heat generated by the laser light source 100 from the mounting protrusion 611 to the entire housing. The heat convection component 720 is a cooling fan mounted on the underside of the light source support 610. The cooling fan can be an axial fan or a centrifugal fan, with its outlet facing the lower surface of the base plate or the heat dissipation fins of the sidewall of the light source support 610. When the fan is operating, it forces airflow across the outer surface of the light source support 610, carrying away heat and dissipating it to the outside of the module. Integrating the heat dissipation function into the light source support 610 eliminates the need for an additional heat sink, simplifying the structure and reducing thermal resistance. As an active convection component, the cooling fan can provide powerful cooling when the laser source is operating at high power (100), ensuring that the junction temperature of the laser chip is below the allowable upper limit (e.g., 85°C), thereby maintaining wavelength stability and lifespan.

[0044] Specifically, the mounting protrusion 611 for mounting the laser light source 100 is located in the front region of the light source support 610, bringing the laser light source 100 closer to the semi-transparent mirror 200 to shorten the optical path. Since the heat source is concentrated in the front, the light source support 610 has heat dissipation fins 711 around the mounting protrusion 611. These fins can be thin sheets arranged longitudinally or laterally, integrally formed with the light source support 610, to increase the heat exchange area. The rear region of the light source support 610 has several matrix-arranged heat dissipation holes 712. These holes 712 penetrate the bottom plate of the light source support 610, forming a vertically continuous air channel. Heat dissipation fins 711 are located on the lower side between adjacent rows of heat dissipation holes 712, meaning the bottom heat dissipation fins 711 and heat dissipation holes 712 are arranged alternately. A cooling fan is installed in the lower region of the heat dissipation fins 711. Part of the airflow blown by the fan directly washes over the lower heat dissipation fins 711, while the other part flows upward through the heat dissipation holes 712, carrying away heat from the upper surface of the light source support 610. The matrix of heat dissipation holes 712 and the lower heat dissipation fins 711 form an interlaced grid, greatly increasing the turbulence effect and heat transfer area. The fins around the mounting protrusions 611 concentrate heat dissipation on hot spots, while the heat dissipation hole / fin combination in the rear area controls the temperature rise of the remaining areas. This layout results in a more uniform temperature distribution across the entire light source support 610, preventing localized overheating. The cooling fan is installed at the bottom, enhancing the synergy between natural and forced convection.

[0045] Example 3 This embodiment provides a vehicle, including a vehicle body and a low beam lighting optical system as described in Embodiment 1, or a low beam lamp module as described in Embodiment 2, mounted on the front of the vehicle body. The vehicle can be a conventional gasoline vehicle, a hybrid vehicle, or a pure electric vehicle. The low beam lighting optical system or module is fixed within the lamp assembly via a standard interface (e.g., a three-point mounting bracket, an adjusting screw) and connected to the vehicle's power supply, CAN bus, and lighting switch via a wiring harness. On the vehicle production line, the assembled module needs to undergo low beam pattern calibration to ensure that the cutoff line position meets regulatory requirements.

[0046] Vehicles equipped with the aforementioned optical systems or modules possess the advantages of high brightness and long range of laser light sources. At the same time, blue light monitoring and graded control ensure human eye safety, and the heat dissipation structure ensures long lifespan, thus improving the overall lighting performance and safety of the vehicle.

[0047] Example 4 This embodiment provides a control method based on the vehicle low beam headlight module described in Example 2. The method includes the following steps: Step 1: Obtain the intensity B of harmful blue light transmitted through the semi-transparent lens 200 and the driving speed v of the vehicle in real time. The controller 500 reads the value of B through the blue light detection device 400 at a sampling frequency not lower than 10 Hz, and at the same time obtains the vehicle speed signal v through the CAN bus at the same frequency. To prevent signal glitches, median filtering or first-order low-pass filtering can be performed on B and v respectively.

[0048] Step 2: Determine whether the intensity B of harmful blue light exceeds the preset safety threshold B safe . B safe The value of B safe is referenced from the retinal hazard limit for continuous exposure in the national standard. If B ≤ B safe , it means the filter film is normal, and the system operates according to the conventional low beam control strategy. If B > B safe , the hierarchical power control process is entered.

[0049] Step 3: When B exceeds B safe , perform the following operations according to the driving speed v and the vehicle speed change trend: If v ≥ V1 (V1 is the high-speed threshold, for example, 80 km / h), it is determined as the high-speed driving state. At this time, the controller 500 issues an alarm signal, for example, sending a diagnostic message through the CAN and displaying "Abnormal blue light in the low beam system, drive carefully" on the dashboard, but keeps the emission power of the laser light source 100 unchanged. Because when driving at high speed, the driver's line of sight is mainly concentrated in the distance, and low beam lighting is crucial. Suddenly reducing the brightness may cause the driver to fail to detect obstacles in time; at the same time, at high speed, the relative speed between the vehicle and pedestrians is extremely high, and the single blue light irradiation time is extremely short, so the risk to the human eye is relatively low. However, the alarm signal persists to remind the driver to drive off the highway and repair as soon as possible.

[0050] If V2 ≤ v < V1 (V2 is the low-speed threshold, for example, 30 km / h), it is determined as the medium-speed driving state. The controller 500 issues an alarm signal and controls the emission power of the laser light source 100 to be reduced to 5% - 80% of the rated power. In the medium-speed state, the vehicle speed can still support a certain braking reaction time, but the lighting demand is still relatively high. After reducing the power to 5% - 80%, the intensity of harmful blue light decreases proportionally (usually can be reduced to below B safe or the critical value), and at the same time, the low beam road surface illuminance can still maintain the basic safety requirements (for example, meet the shortest sight distance under the condition of 30 km / h).

[0051] If v < V2 and the vehicle is decelerating (e.g., decelerating from 20 km / h to a stop), it is determined to be in the deceleration preparation for stop state. The controller 500 issues an alarm signal and controls the emission power of the laser light source 100 to be reduced to 20% - 50% of the rated power. During the deceleration process, as the vehicle is about to stop, the dependence on long-distance lighting is significantly reduced. At this time, maintaining low-power lighting is sufficient to meet the needs of short-distance and low-speed movement, while significantly reducing the amount of blue light leakage.

[0052] If v < V2 and the vehicle is accelerating (e.g., accelerating from a standstill to 20 km / h), it is determined to be in the starting driving state. The controller 500 issues an alarm signal and cuts off the laser light source 100 (i.e., controls the power to 0). At the starting stage, the vehicle speed is extremely low, and the driver can completely operate safely through the front fog lights, outline lights or external street lights; at the same time, cutting off the laser can completely eliminate the blue light risk and avoid causing harm during long-term exposure at low speeds (e.g., when the vehicle is moving slowly in a traffic jam and pedestrians pass by the front of the vehicle closely).

[0053] Among them, the discrimination of the speed change trend can be carried out in the following way: calculate the derivative dv / dt of v with respect to time t. When dv / dt < -0.5 m / s² (about -1.8 km / h / s) and lasts for more than 0.3 seconds, it is determined to be in the deceleration process; when dv / dt > +0.5 m / s² and lasts for more than 0.3 seconds, it is determined to be in the acceleration process; if the absolute value of the acceleration is small, the previous determination result is maintained to avoid frequent switching.

[0054] This control method dynamically associates the blue light safety response with the vehicle speed and its change trend, realizing the logic of ensuring lighting at high speeds, moderately reducing at medium speeds, reducing power at low speeds, and being able to cut off at the start. It not only meets the basic requirements of human eye safety protection but also minimizes the adverse impact of faulty lighting on driving safety. At the same time, by continuously alarming to remind the driver, the fault can be promptly detected and processed.

[0055] In an optional implementation, if v < V2 and the vehicle is accelerating, the method further includes: controlling the auxiliary lighting device on the same side as the turned-on and -off low-beam light module, and the auxiliary lighting device includes a front fog light or a corner light. Specifically, when the controller 500 cuts off the laser light source 100 during the low-speed starting stage due to excessive blue light, it immediately sends an instruction to the body controller (BCM) via the CAN bus to request the activation of the corresponding side's front fog light or corner light. If the vehicle is equipped with a corner auxiliary lighting function, its lamps usually have a relatively wide lateral light distribution, which can make up for the short-distance lighting in front of the vehicle head after the low beam is cut off. At the same time, the controller 500 will also display the cut-off state and the auxiliary lighting activation information on the dashboard. After forcibly cutting off the laser light source 100, the existing auxiliary lighting lamps of the vehicle are used to provide basic lighting to improve driving safety.

[0056] In one alternative implementation, when v ≥ V1 and B exceeds B safe The duration exceeds the preset time threshold T hold At this time, the emission power of the laser source 100 is reduced to 50%-80% of its rated power. hold The timeout period can be set to 3-5 minutes. This means that while maintaining the original power is permissible temporarily at high speeds, if blue light leakage persists for more than a certain period (e.g., 5 minutes), it indicates that the filter membrane may have suffered irreversible and serious failure, and continuing to wait could lead to an accumulation of safety risks. At this point, the controller 500 will no longer maintain the original power but will actively reduce the power to 50%-80%, while simultaneously issuing a more urgent alarm (such as flashing text and audible alerts). Under this reduced power condition, the vehicle can still maintain basic lighting, but the driver should be advised to exit the highway as soon as possible and have the vehicle repaired.

[0057] Furthermore, in an optional implementation, this embodiment provides a self-test initiation step to assess the health status of the filter membrane upon power-on or wake-up and to adopt an appropriate operating mode.

[0058] Specifically, each time the low beam headlight module is powered on (e.g., when the vehicle is started) or awakened from a dormant state (e.g., after being parked for a period of time), the laser light source 100 is not initially turned on at full power, but rather illuminated at 10% of its rated power for 0.5 seconds. This is a brief, low-power light emission pulse that does not produce significant thermal effects or glare interference. During this pulse, the blue light detection device 400 detects the intensity of harmful blue light, denoted as B. self Then according to B self The numerical range is determined in three levels: Level 1: If B self ≤B _normal B normal The preset upper limit of normal blue light intensity (e.g., 0.1mW / cm²), and B normal safe At this point, it is determined that the laser source 100 and the blue light filter are intact, and the system switches to normal operating mode, which allows it to operate at 100% rated power and work according to the conventional low beam control strategy.

[0059] Level 2: If B normal self safe ​​​If the laser light source 100 or the blue light filter membrane is significantly degraded, but not yet to the point of immediate harm, the controller 500 will not allow full-power startup. Instead, it will control the laser light source 100's emission power to 30% of its rated power for emergency lighting. Simultaneously, a fault code will be sent to the instrument panel via the CAN bus, illuminating the fault indicator light and issuing an alarm signal (a buzzer or text message stating "Low beam system performance degraded, please have it checked as soon as possible"). In this mode, the low beam headlights will still provide some forward illumination, but the brightness will be low; drivers should avoid high-speed night driving.

[0060] Level 3: If B self ≥B safe If the laser light source 100 or the blue light filter is found to be severely faulty, and the transmitted harmful blue light directly exceeds the safety threshold, the controller 500 will prevent the laser light source 100 from starting. This means that the laser light source 100 will not illuminate regardless of how the driver operates the low beam switch. Simultaneously, an emergency alarm signal will be issued (e.g., a continuous high-frequency beep or a red warning on the instrument panel stating "Low beam system malfunction, please replace the low beam headlights").

[0061] The self-test function checks the filter status before each use of the low beam, preventing damage from blindly starting the headlights when they are already faulty. The three-stage grading system ensures safety while retaining some lighting functionality (30% emergency power), reflecting a fault-tolerant design philosophy. The storage and reporting of fault codes facilitates after-sales diagnosis and repair.

[0062] The vehicle low beam headlight module control method provided by this invention dynamically correlates the blue light safety response with vehicle speed and its changing trend, achieving dynamic hierarchical control. This realizes control logic of maintaining illumination at high speeds, moderately reducing power at medium speeds, reducing power at low speeds, and cutting off power upon starting. This not only meets the basic requirements for human eye safety protection but also minimizes the adverse effects of faulty lighting on driving safety. Simultaneously, continuous alarms alert the driver, ensuring timely detection and handling of faults.

[0063] Example 5 This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory. When the processor executes the computer program, it implements the steps of the vehicle low beam headlight module control method described in Embodiment 4 above. This electronic device can be a standalone microcontroller (e.g., an internal MCU for vehicle lights) or a processing unit integrated into the vehicle's BCM or headlight control module. The memory stores firmware code, including parameters such as blue light threshold, vehicle speed threshold, and time threshold. The processor connects to a blue light detection device 400, a laser source 100 driver circuit, a CAN transceiver, and an alarm device via I / O interfaces. When the program runs, the processor executes a process of self-testing, real-time monitoring, and graded power control to implement the above method.

[0064] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A vehicle low beam optical system characterized by comprising: include: Laser light source, used to emit excitation light; A semi-transparent lens is disposed in the light output path of the laser source, and a blue light filter is disposed on the semi-transparent lens to filter out harmful blue light in the excitation light; A light distribution lens is disposed on the reflected light path of the semi-transparent lens to shape the light transmitted through the semi-transparent lens into a near-light pattern. A blue light detection device is installed in the transmission light path of the semi-transparent lens to detect the intensity of harmful blue light after transmission through the semi-transparent lens.

2. The vehicle low beam optical system according to claim 1, characterized by The optical axis of the laser source is set vertically upward, the curved surface of the semi-transparent lens is used to convert the incident light emitted by the laser source into outgoing light extending horizontally, and the optical axis of the lens is set horizontally.

3. The vehicle low beam optical system of claim 1, wherein The blue light detection device includes a photoelectric sensor and a bandpass filter, wherein the center wavelength of the bandpass filter is 420nm±10nm.

4. A vehicle low beam headlight module, characterized in that, include: The vehicle low beam optical system according to any one of claims 1-3, and the controller, wherein the controller controls the power of the laser light source and the alarm signal according to the detection signal of the blue light detection device and the vehicle speed.

5. The vehicle low beam module of claim 4, wherein, It also includes a mounting assembly for the low beam optical system, the mounting assembly including a light source support, a semi-transparent mirror support, a lens support, and a blue light detection support, wherein the light source support, the semi-transparent mirror support, and the blue light detection support are connected to form a first mounting assembly, and the lens support and the first mounting assembly are each mounted on the vehicle headlight mounting bracket by fastening components.

6. The vehicle low beam module of claim 5, wherein, The light source support is a shell structure with an opening on the top. The upper surface of the base plate of the light source support has a mounting protrusion that matches the shape of the laser light source. The laser light source is connected to the mounting protrusion by a fastening assembly. The semi-transparent mirror support is connected to the front region of the light source support, and extends upward in a curved shape to form an insertion groove. The semi-transparent mirror has a curved surface region and a flat surface region. The curved surface region of the semi-transparent mirror is inserted into the insertion groove of the semi-transparent mirror support, and the flat surface region of the semi-transparent mirror is mounted on the upper surface of the semi-transparent mirror support. The blue light detection support is constructed as a front-side semi-enclosed shell structure, which is connected to the upper side of the semi-transparent mirror support and surrounds and covers the semi-transparent mirror inside it. The blue light detection device is installed on the inner side of the top wall of the blue light detection support.

7. The vehicle low beam module of claim 6, wherein, The lens support is a housing structure with a mounting cavity on the rear side, and the front area of ​​the lens support is provided with a snap-fit ​​groove suitable for connecting the lens; the first mounting component is located inside the mounting cavity of the lens support, and the mirror surface area of ​​the lens covers the light-emitting surface of the reflector.

8. The vehicle low beam module of claim 5, wherein, It also includes a heat dissipation assembly for dissipating heat from the laser light source, the heat dissipation assembly comprising a heat conduction component and a heat convection component; wherein, the heat conduction component is a light source support member, and the heat convection component is a cooling fan installed on the underside of the support member.

9. The vehicle low beam module of claim 8, wherein, The mounting protrusion is located in the front side area of the light source support member, and the light source support member is provided with heat dissipation fins around the mounting protrusion; the rear side area of the light source support member is provided with a plurality of heat dissipation holes arranged in a matrix, and heat dissipation fins are provided on the lower side between adjacent rows of heat dissipation holes, and the heat dissipation fan is installed in the lower side area of the heat dissipation fins.

10. A vehicle, comprising a vehicle body and a low beam optical system as described in any one of claims 1 to 3 mounted on the front part of the vehicle body, or a low beam lamp module as described in any one of claims 4 to 9.

11. A method of controlling a vehicle low beam module according to any one of claims 2 to 9, characterized in that Comprising the following steps: Obtain the intensity B of harmful blue light transmitted through the semi-transparent lens and the driving speed v of the vehicle in real time; Determine whether the intensity B of the harmful blue light exceeds a preset safety threshold B. safe ; When B exceeds B safe the following operation is performed in accordance with the vehicle speed v and the speed change tendency of the vehicle: If v ≥ V1, send an alarm signal and control the emission power of the laser light source to remain unchanged; If V2 ≤ v < V1, send an alarm signal and control the emission power of the laser light source to be reduced to 50% - 80% of the rated power; If v < V2 and the vehicle is in a decelerating process, send an alarm signal and control the emission power of the laser light source to be reduced to 20% - 50% of the rated power; If v < V2 and the vehicle is in an accelerating process, send an alarm signal and cut off the laser light source; Wherein, V1 and V2 are preset speed thresholds, and V2 < V1.

12. The control method according to claim 11, characterized by, If v < V2 and the vehicle is in an accelerating process, the method further comprises: controlling to turn on and off the auxiliary lighting device on the same side as the low beam lamp module turned on and off, and the auxiliary lighting device includes a front fog lamp or a corner lamp.

13. The control method according to claim 11, characterized by, When v > V1 and B exceeds B safe for a duration exceeding a preset time threshold T hold the emission power of the laser light source is controlled to decrease to 50-80% of the rated power.

14. The control method according to claim 11, characterized in that, Also included is a start-up self-checking step: each time the low beam module is powered on or wakes up from a sleep state, first light up the laser light source for 0.5 seconds at 10% of the rated power, detect the harmful blue light intensity B at this time self ; If B self ≤ B normal , wherein B normal is a preset upper limit of normal blue light intensity and B normal <B safe , switch to normal working mode; If B normal <B self <B safe Then the emission power of the laser light source is controlled to be 30% of the rated power, and an alarm signal is sent out. If B self ≥B safe If the laser light source is not activated, an alarm signal will be issued.

15. An electronic device comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the steps of the control method of the vehicle low beam lamp module as described in any one of claims 11 to 14.

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