Real-time intelligent temperature control system for high-power bullet train headlamp

Abstract

The invention relates to the technical field of vehicle lamps, in particular to a real-time intelligent temperature control system for a high-power bullet train headlamp. According to the high-power bullet train headlamp real-time intelligent temperature control system, the temperature detection module monitors the temperature of the double lamp sets in real time and feeds back the temperature to the decision module. Based on a control strategy generated by real-time data, the main lamp group can be dynamically switched according to a temperature threshold value, for example, the first lamp group is switched to the second lamp group when the temperature is high, and the first lamp group and the second lamp group alternately work to balance heat dissipation; meanwhile, the decision-making module adopts a progressive brightness control strategy, and brightness sudden change during threshold triggering in a traditional scheme is avoided through staged linear adjustment of the brightness of the lamp set.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle lamps, and in particular to a real-time intelligent temperature control system for high-power motor vehicle headlights. Background Art

[0002] With the rapid development of the rail transit industry, high-power LED headlights have become the mainstream configuration for train lighting systems due to their high brightness and long lifespan. However, continuous high-power operation of LED light sources generates a large amount of heat. Improper heat dissipation management can lead to increased light decay, shortened lifespan, and even device failure, seriously impacting driving safety and maintenance costs.

[0003] Currently, temperature control systems for high-power EMU headlights generally utilize a fixed-threshold control strategy. This involves presetting a single temperature threshold (e.g., 80°C) and initiating cooling or power reduction measures when the lamp temperature reaches that threshold. However, fixed thresholds are difficult to adapt to complex operating conditions. EMU operating environments vary widely (e.g., low temperatures in cold regions, high temperatures in tropical regions), and fixed thresholds cannot dynamically respond to environmental changes. For example, in high-temperature environments, a fixed threshold may cause delayed activation of temperature control measures, exacerbating heat accumulation in the lamps. Conversely, in low-temperature environments, threshold-triggered power reduction operations can actually reduce lighting efficiency.

[0004] In summary, the traditional fixed threshold control strategy lacks dynamic adaptability and is unable to meet the temperature control requirements of high-power train headlights under complex working conditions. A temperature control solution based on real-time monitoring and intelligent decision-making is urgently needed. Summary of the Invention

[0005] To solve the above problems, the present invention discloses a real-time intelligent temperature control system for high-power motor vehicle headlights, comprising: A temperature detection module, configured to monitor the temperature information of the first lamp group and the second lamp group respectively, and feed the temperature information back to the decision module; A decision module is used to generate a lamp group control strategy based on the detection data fed back by the temperature detection module. The lamp group control strategy includes a switching frequency of the lamp group and a corresponding brightness control strategy. The brightness control strategy includes gradually increasing or decreasing the brightness of the first lamp group and / or the second lamp group.

[0006] In one possible implementation, the system further includes: A fault detection module, configured to monitor the working status of the first lamp group and the second lamp group; a first control module, configured to control the first light group and / or the second light group respectively according to control information from the decision module; a second control module, configured to control the first light group and / or the second light group respectively according to control information from the decision module; The decision module is further configured to switch the corresponding lamp group to the corresponding control module according to the fault information fed back by the fault detection module.

[0007] Among them, a switching unit is provided between the first control module and the second control module, and the switching unit includes a solid-state relay module. The solid-state relay module is used to receive the switching instruction of the decision module, perform electrical isolation through the isolation element, and establish or cut off the control signal path between the first control module, the second control module and the first lamp group, the second lamp group.

[0008] The decision module transmits control information to the first control module and the second control module through a communication protocol in a standard CAN data frame format. The standard CAN data frame format divides the control information according to function to form multiple different data segments, and each data segment is responsible for carrying the corresponding type of control information.

[0009] In the above scheme, the decision module includes a frequency dynamic adjustment unit, which is used to generate a non-fixed period lamp group switching interval so that the switching frequency fluctuates within a preset range of the basic period; the fluctuation range is associated with the energy storage element parameters in the driving units of the first lamp group and the second lamp group. The decision module also includes a resonant frequency detection unit, which is used to calculate the inherent resonant frequency of the driving circuit in real time and dynamically adjust the random fluctuation range according to the inherent resonant frequency.

[0010] The frequency dynamic adjustment unit generates a switching interval sequence through a chaotic sequence generation module, and the chaotic sequence generation module makes the switching interval present a random distribution through a nonlinear iterative algorithm; The energy storage element of the driving unit includes an inductor and a capacitor, the natural resonant frequency is dynamically calculated and obtained according to the inductor value and the capacitor value, and the frequency dynamic adjustment unit adjusts the fluctuation range of the switching frequency according to the natural resonant frequency.

[0011] In one embodiment, the system further includes an annular substrate, one side of the annular substrate is recessed inward to form a plurality of first mounting positions arranged in an annular shape, and the spacing areas on the annular substrate corresponding to the first mounting positions form a plurality of second mounting positions arranged in an annular shape, and the first lamp group and the second lamp group are respectively installed in the first mounting position and the second mounting position, so that the first lamp group and the second lamp group form a staggered arrangement.

[0012] Wherein, two light-emitting units are installed at each installation position of the first installation position and the second installation position.

[0013] The control information includes synchronous start and independent start of two light emitting units in each installation position, and synchronous start of light emitting units in adjacent positions in the first lamp group and the second lamp group.

[0014] This application's real-time intelligent temperature control system for high-power train headlights uses a temperature detection module to monitor the temperature of two lamp groups in real time and provide feedback to the decision-making module. A control strategy generated based on real-time data dynamically switches the primary lamp group based on temperature thresholds. For example, when the first lamp group reaches a high temperature, it switches to the second lamp group, alternating between them to balance heat dissipation. The decision-making module also employs a progressive brightness control strategy, linearly adjusting the brightness of the lamp groups in stages to avoid the sudden brightness changes encountered in traditional solutions when thresholds are triggered. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an architectural diagram of a real-time intelligent temperature control system for high-power motor vehicle headlights in an embodiment of the present application; Figure 2 This is an architecture diagram of another high-power motor vehicle headlight real-time intelligent temperature control system in an embodiment of the present application; Figure 3 This is a schematic diagram of the structure of the decision-making module in the embodiment of the present application; Figure 4 This is a schematic structural diagram of the annular substrate in an embodiment of the present application; Figure 5 for Figure 4 side view. DETAILED DESCRIPTION

[0016] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The principles and features of the present invention are described below in conjunction with the drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0017] The terms "including" and other expressions with similar meanings in the specification or claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions, such as a process, method or system, or apparatus comprising a series of steps or units is not limited to the listed steps or units.

[0018] Example 1: A real-time intelligent temperature control system for high-power motor vehicle headlights, such as Figure 1-3 As shown, it specifically includes: a temperature detection module 100, a first lamp group 101, a second lamp group 102 and a decision module 200; The temperature detection module is used to monitor the temperature information of the first lamp group and the second lamp group respectively, and feed the temperature information back to the decision module; In this embodiment, the first and second lamp groups are independent groups, each comprising multiple independent lighting units for illumination, each of which includes LED light-emitting components. The temperature detection module independently monitors real-time temperature information (e.g., LED junction temperature, housing surface temperature, etc.) of the first and second lamp groups, and then collects data using sensors (e.g., thermocouples or infrared temperature measurement). This real-time temperature data is fed back to the decision-making module to inform the control strategy.

[0019] A decision module is used to generate a lamp group control strategy based on the detection data fed back by the temperature detection module. The lamp group control strategy includes a switching frequency of the lamp group and a corresponding brightness control strategy. The brightness control strategy includes gradually increasing or decreasing the brightness of the first lamp group and / or the second lamp group.

[0020] In one embodiment, the decision module generates a light group control strategy based on the temperature data, including: Lamp group switching frequency: Dynamically switch the main lamp group according to the temperature threshold (for example, when the first lamp group is at high temperature, switch to the second lamp group, and work alternately to balance heat dissipation).

[0021] Brightness control strategy: Use gradual adjustment (for example, linear brightness change from 0% to 100%) to avoid current surges and temperature rises caused by sudden brightness changes. Specifically, the following are included: Single lamp group is adjusted independently. For example, when the first lamp group is at high temperature, it switches to the second lamp group. During the switching process, the brightness of the first lamp group is gradually reduced, and the brightness of the second lamp group is gradually increased. In one embodiment, the method includes: after detecting that the temperature of the first lamp group exceeds a limit, generating a brightness decreasing instruction for the first lamp group and a brightness increasing instruction for the second lamp group; The brightness decreasing / increasing instruction controls the successive on / off or power adjustment of the light-emitting unit according to a preset gradient, so that the brightness change curves of the two lamp groups are complementary.

[0022] Among them, the brightness of the first lamp group gradually decreases, and its light-emitting units are gradually turned off according to a preset gradient (for example, the brightness is reduced by 10% every 100ms) (for example, if there are two light-emitting units in a single installation position, one of them is turned off independently first, and then the other, or the PWM duty cycle is gradually reduced) to avoid lighting blind spots caused by sudden drops in brightness.

[0023] The brightness of the second lamp group gradually increases, and its light-emitting units are gradually turned on according to a preset gradient (such as increasing the brightness by 10% every 100ms) (first turn on a single unit independently, then turn on the two units synchronously, or gradually increase according to the PWM duty cycle) to ensure a smooth transition of the overall lighting brightness during the switching process.

[0024] The brightness change curves of the two lamp groups are "complementary and gradual" (for example, when the brightness of the first lamp group drops from 100% to 0%, the brightness of the second lamp group increases from 0% to 100%), maintaining the stability of the total luminous flux and avoiding visual discomfort to the driver due to sudden changes in brightness.

[0025] Example 2: Figure 4-5 As shown, the system further includes an annular substrate 500; One side of the annular substrate is recessed inward to form a plurality of first mounting positions arranged in a ring shape, and the spacing areas between the corresponding first mounting positions on the annular substrate form a plurality of second mounting positions arranged in a ring shape. The first lamp group and the second lamp group are respectively installed in the first mounting position and the second mounting position, so that the first lamp group and the second lamp group form a staggered arrangement. Due to the staggered distribution of the first lamp group and the second lamp group, the light-emitting units of the two are "lit up in intervals" in space, and the switching is done through the gradual alternation of light and dark between adjacent units; for example, the units of the first lamp group are extinguished one by one, and the units of the second lamp group are lit one by one. By achieving a smooth transition of the lighting area at the physical level, sudden changes in light spots caused by the concentrated opening and closing of the lamp groups are avoided. In addition, the staggered arrangement can also increase the physical distance between the lamp groups, improve the air convection efficiency, and reduce the thermal coupling effect of adjacent lamp groups.

[0026] Wherein, two light-emitting units are installed at each installation position of the first installation position and the second installation position.

[0027] The control information includes synchronous start and independent start of two light emitting units in each installation position, and synchronous start of light emitting units in adjacent positions in the first lamp group and the second lamp group.

[0028] Specifically, taking a certain installation position of the first lamp group as an example, the control logic at high temperature is as follows: Initial state: dual light-emitting units are turned on synchronously; Temperature warning: shut down one of the units; Temperature exceeds the limit: triggers the light group switching, and the brightness of the remaining unit is gradually reduced to 0% according to the gradient. At the same time, the corresponding installation position of the second light group is brightened in a step-by-step manner from "single unit to double unit".

[0029] Progressive coordination of adjacent synchronous activations: During the switching process, the adjacent light-emitting units of the first and second light groups adopt "alternating transition between light and dark" (for example, when unit A of the first light group gradually turns off, the adjacent unit B of the second light group gradually turns on), ensuring that there is no dark area at the junction of the light spots and improving the uniformity of lighting.

[0030] In one embodiment, the decision module can dynamically generate bidirectional progressive control instructions based on the real-time data of the temperature detection module (e.g., every 5°C increase in the average temperature of the first lamp group triggers a one-level brightness reduction: dual unit → single unit → half-power single unit → off) and the temperature of the second lamp group (e.g., full power is allowed when it is below a threshold).

[0031] Through the linkage relationship between the hardware structure (dual light-emitting units, staggered layout) and the control strategy of this embodiment, the lighting performance of the lamp group during the switching control process is further optimized.

[0032] Example 3: Figure 2 As shown, in a possible implementation, the system further includes: a fault detection module 300, a first control module 401 and a second control module 402; A fault detection module, configured to monitor the working status of the first lamp group and the second lamp group; a first control module, configured to control the first light group and / or the second light group respectively according to control information from the decision module; a second control module, configured to control the first light group and / or the second light group respectively according to control information from the decision module; The decision module is further configured to switch the corresponding lamp group to the corresponding control module according to the fault information fed back by the fault detection module.

[0033] In one embodiment, the fault detection module collects parameters such as current, voltage, brightness, temperature (combined with the temperature detection module data of Example 1) of the first / second lamp group in real time through sensors; Based on preset thresholds (such as current fluctuation exceeding ±10%, brightness drop exceeding 30%, and temperature exceeding critical value) or machine learning algorithms, it is determined whether the lamp group has problems such as short circuit, open circuit, light source failure, and drive circuit failure.

[0034] Feedback the fault type code to the decision module, for example, 0x01 indicates a short circuit in the first lamp group, 0x02 indicates a communication interruption in the second control module; fault location (specific lamp group and installation position), severity level (emergency / warning / minor).

[0035] The first control module and the second control module are both equipped with a complete driving module, which may include a PWM dimming module and a switch control unit, and can independently control all light-emitting units of the first / second lamp group; During normal operation, the two control modules can share control tasks according to preset strategies; for example, the first control module controls the first light group, and the second control module controls the second light group, or they are in a "one in use and one in standby" state, and the standby module synchronizes the control parameters of the main module in real time.

[0036] Receive the control instruction package of the decision module, which includes brightness value, light unit on / off combination, switching timing, etc., and output control signals such as voltage / current regulation signals and switching value signals through independent driving circuits.

[0037] When the fault detection module reports a lamp group-level fault (e.g., a lamp group detects overcurrent three times in a row) or a control module-level fault (e.g., the communication with the first control module is interrupted for more than 50ms), the switching logic is triggered; The decision module sends an instruction to the switching unit to cut off the signal path between the fault control module and the lamp group through the solid-state relay (such as disconnecting the first control module from the first lamp group); Establish a path between the normal control module and the target light group (e.g., connect the second control module to the first light group), and synchronize the current control parameters (e.g., brightness, light unit status); Meanwhile, referring to the progressive adjustment logic of Example 1, the control signal is gradually transitioned during the switching process (eg, the control transfer is completed within 500ms) to avoid current surge or lighting flicker.

[0038] In this embodiment, a switching unit is provided between the first and second control modules. The switching unit includes a solid-state relay module. The solid-state relay module is configured to receive switching instructions from the decision module, electrically isolate the modules via an isolation element, and establish or disconnect control signal pathways between the first and second control modules and the first and second light groups. Compared to traditional electromagnetic relays, the solid-state relay module has a response time of less than 10 μs, enabling nanosecond-level switching of control signal pathways, meeting the real-time requirements of high-speed train operation. Isolation elements can use optocouplers or magnetic isolators to isolate the control module from the power / signal circuit of the lamp group, suppress common-mode interference (such as electromagnetic noise generated by the motor of the train), and prevent faults from spreading between modules (for example, when the power supply of a control module is short-circuited, the isolation element cuts off the energy transfer path).

[0039] Among them, control information is transmitted between the decision module and the first control module and the second control module through a communication protocol in the standard CAN data frame format. The standard CAN data frame format divides the control information according to function to form multiple different data segments, and each data segment is responsible for carrying the corresponding type of control information.

[0040] For example, the multiple data segments may include: an ID segment, a fault code segment, a brightness control segment, and a channel configuration segment; the corresponding CAN frame structure is: [frame ID: 0x123][data segment 1: fault code 0x01][data segment 2: brightness command 0x64][data segment 3: channel configuration 0b1001]; The CAN bus's differential signal transmission method can effectively suppress electromagnetic interference and, combined with the CRC check mechanism, ensure the reliable transmission of control commands in the complex electromagnetic environment of the EMU. The standardized data segment design facilitates subsequent functional upgrades (such as adding new sensors or control strategies) without modifying the underlying communication architecture, simply by defining new data segment functions.

[0041] The dual control modules in this embodiment back up each other. When a single module fails, the control link is reconstructed through the switching unit. The solid-state relay supports multi-channel combinations. Even if a physical line fails, control can still be achieved through other channels (for example, the second control module is connected to the first light group through a backup line).

[0042] Example 4: Figure 3 As shown, the decision module includes a frequency dynamic adjustment unit, which is used to generate a non-fixed period lamp group switching interval so that the switching frequency fluctuates within a preset range of the basic period; the fluctuation range is associated with the energy storage element parameters in the driving units of the first lamp group and the second lamp group. The decision module also includes a resonant frequency detection unit, which is used to calculate the inherent resonant frequency of the driving circuit in real time and dynamically adjust the random fluctuation range according to the inherent resonant frequency.

[0043] The base period is a relatively stable reference time interval, while the fluctuation range is the range within which the base period fluctuates. For example, if the base period is set to 100ms and the fluctuation range is ±20ms, the actual switching interval will randomly fluctuate between 80ms and 120ms.

[0044] The frequency dynamic adjustment unit generates a switching interval sequence through a chaotic sequence generation module, and the chaotic sequence generation module makes the switching interval present a random distribution through a nonlinear iterative algorithm; The energy storage element of the driving unit includes an inductor and a capacitor, the natural resonant frequency is dynamically calculated and obtained according to the inductor value and the capacitor value, and the frequency dynamic adjustment unit adjusts the fluctuation range of the switching frequency according to the natural resonant frequency.

[0045] The fixed cycle of light group switching can, in some cases, make the system susceptible to interference from specific frequencies or cause resonance, leading to system instability. The dynamic frequency adjustment unit generates a non-fixed cycle of light group switching intervals, allowing the switching frequency to fluctuate within a preset range of the basic cycle. This improves the system's anti-interference ability and reduces the probability of resonance.

[0046] In one embodiment, a nominal switching interval (e.g., 500 milliseconds) may be preset as a benchmark for dynamic adjustment. With the nominal switching interval as the center, dynamic adjustment may be performed within a range of the nominal switching interval plus or minus ΔT, where ΔT is determined by the natural resonant frequency of the energy storage element (e.g., ΔT is the ratio of the proportionality coefficient to the natural resonant frequency).

[0047] A randomized time interval sequence is outputted through a chaotic sequence generation module. Each time interval in the sequence falls within a preset fluctuation range, and there is no periodic correlation between adjacent time intervals.

[0048] The chaotic sequence generation module adopts typical nonlinear iterative algorithms such as Logistic mapping, and its iterative relationship is: the next iteration value is equal to the product of the control parameter, the current iteration value, and the complement of the current iteration value.

[0049] The chaotic sequence is mapped to the target time interval through a linear transformation. Specifically, each time interval in the sequence is equal to the minimum time interval plus the product of the current chaotic iteration value and the difference between the maximum time interval and the minimum time interval. The minimum time interval is the nominal switching interval minus ΔT, and the maximum time interval is the nominal switching interval plus ΔT.

[0050] The drive unit's energy storage circuit is an LC filter or resonant circuit. The actual values ​​of the inductance and capacitance are acquired in real time through hardware sensors or a parameter self-identification algorithm (such as the least squares method). When the change in the inductance or capacitance exceeds a set threshold (for example, plus or minus 5%), the natural resonant frequency is recalculated and the switching frequency fluctuation range is updated.

[0051] When the temperature of the lamp group in Example 1 exceeds the warning threshold, the frequency dynamic adjustment unit can temporarily reduce the fluctuation range, give priority to ensuring the stability of the switching frequency, and avoid conflicts between the heat dissipation strategy and the frequency adjustment strategy; When the solid-state relay switching unit of Example 3 performs path reconstruction, the frequency dynamic adjustment unit synchronously suspends chaotic sequence generation, uses a fixed safe frequency to complete switching, and resumes dynamic adjustment after the control link is stable.

[0052] The technical means disclosed in the solutions of the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A real-time intelligent temperature control system for high-power train headlights, characterized in that: include: A temperature detection module, configured to monitor the temperature information of the first lamp group and the second lamp group respectively, and feed the temperature information back to the decision module; A decision module is used to generate a lamp group control strategy based on the detection data fed back by the temperature detection module. The lamp group control strategy includes a switching frequency of the lamp group and a corresponding brightness control strategy. The brightness control strategy includes gradually increasing or decreasing the brightness of the first lamp group and / or the second lamp group.

2. The real-time intelligent temperature control system for high-power motor vehicle headlights according to claim 1 is characterized in that: Also includes: A fault detection module, configured to monitor the working status of the first lamp group and the second lamp group; a first control module, configured to control the first light group and / or the second light group respectively according to control information from the decision module; a second control module, configured to control the first light group and / or the second light group respectively according to control information from the decision module; The decision module is further configured to switch the corresponding lamp group to the corresponding control module according to the fault information fed back by the fault detection module.

3. The real-time intelligent temperature control system for high-power motor vehicle headlights according to claim 2 is characterized in that: A switching unit is provided between the first control module and the second control module. The switching unit includes a solid-state relay module. The solid-state relay module is used to receive the switching instruction of the decision module, perform electrical isolation through an isolation element, and establish or cut off the control signal path between the first control module, the second control module and the first lamp group, the second lamp group.

4. The real-time intelligent temperature control system for high-power motor vehicle headlights according to claim 2 is characterized in that: The decision module transmits control information to the first control module and the second control module through a communication protocol in a standard CAN data frame format. The standard CAN data frame format divides the control information according to function to form multiple different data segments, and each data segment is responsible for carrying the corresponding type of control information.

5. The real-time intelligent temperature control system for high-power motor vehicle headlights according to any one of claims 1 to 4, characterized in that: The decision module includes a frequency dynamic adjustment unit, which is used to generate a non-fixed period lamp group switching interval so that the switching frequency fluctuates within a preset range of the basic period; the fluctuation range is associated with the energy storage element parameters in the driving units of the first lamp group and the second lamp group. The decision module also includes a resonant frequency detection unit, which is used to calculate the inherent resonant frequency of the driving circuit in real time and dynamically adjust the random fluctuation range according to the inherent resonant frequency.

6. The real-time intelligent temperature control system for high-power motor vehicle headlights according to claim 5 is characterized in that: The frequency dynamic adjustment unit generates a switching interval sequence through a chaotic sequence generation module, and the chaotic sequence generation module makes the switching interval present a random distribution through a nonlinear iterative algorithm; The energy storage element of the driving unit includes an inductor and a capacitor, the natural resonant frequency is dynamically calculated and obtained according to the inductor value and the capacitor value, and the frequency dynamic adjustment unit adjusts the fluctuation range of the switching frequency according to the natural resonant frequency.

7. The real-time intelligent temperature control system for high-power motor vehicle headlights according to any one of claims 1-3, characterized in that: It also includes an annular base plate, one side of the annular base plate is recessed inward to form a plurality of first mounting positions arranged in a ring shape, and the spacing areas between the corresponding first mounting positions on the annular base plate form a plurality of second mounting positions arranged in a ring shape, and the first lamp group and the second lamp group are respectively installed in the first mounting position and the second mounting position, so that the first lamp group and the second lamp group are staggered.

8. The real-time intelligent temperature control system for high-power train headlights according to claim 7 is characterized in that: Two light-emitting units are installed at each installation position of the first installation position and the second installation position.

9. The real-time intelligent temperature control system for high-power motor vehicle headlights according to claim 8, characterized in that: The control information includes synchronous start and independent start of two light emitting units in each installation position, and synchronous start of light emitting units in adjacent positions in the first lamp group and the second lamp group.

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