A pixel headlamp dynamic thermal management method and an automobile light control system

Abstract

The application discloses a pixel large lamp dynamic thermal management method and an automobile light control system, and belongs to the technical field of light control. Through strategy one, auxiliary area power reduction; strategy two, auxiliary area shutdown; strategy three, frame insertion power reduction; and strategy four, overall power reduction, the pixel large lamp dynamic thermal management method adopts the partition power reduction or frame insertion power reduction mode to reduce heat generation, and guarantees the definition and brightness of an overall picture.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of light control, in particular to a pixel headlight dynamic thermal management method and an automobile light control system. BACKGROUND

[0002] The lighting light source on the traditional automobile generally adopts halogen lamp and xenon headlight. The halogen lamp and xenon headlight are gradually replaced by LED headlight because of low brightness, short service life, large radiation energy, light pollution and general use safety. In addition, the traditional headlight cannot meet the needs of night driving and complex road driving projection canvas indication in functionality, so the pixel headlight is widely used as a light source in the current automobile. The pixel headlight is composed of a matrix of LED lamp beads, each of which can be controlled individually to realize the projection of complex images. However, the LED lamp beads generate a large amount of heat during long-term use, and the constant projection of fixed images is easy to cause thermal runaway and reduce the clarity and brightness of the projected image. Therefore, it is necessary to perform thermal management on the pixel headlight to meet the clarity and brightness requirements of the projected image.

[0003] The patent application with the publication number CN115843137A discloses a PCBA board for intelligent vehicle light control, which includes MCU1, LED control system, power control system, VBAT and car system. The MCU is controlled by the car system. The LED control system includes multiple groups of LED driving modules, LEDs and LED lighting detection modules. The power control system includes a power manager, a voltage detection module, a current detection module and a bus switch. The PCBA board for intelligent vehicle light control improves the heat dissipation capacity by reducing the number of lamp beads, but cannot meet the needs of clear and bright projected images. SUMMARY

[0004] One of the purposes of the present application is to provide a pixel headlight dynamic thermal management method, which solves the problem that the existing pixel headlight cannot guarantee the clarity and brightness of the projected image under long-term illumination.

[0005] To achieve the above-mentioned purposes, the technical solutions adopted by the present application are as follows:

[0006] A pixel headlight dynamic thermal management method, comprising the following steps:

[0007] S1, the pixel headlight controller is initialized, and the pixel units on the pixel headlight are divided into two types of key areas and auxiliary areas. Each key area and auxiliary area is configured with a separate temperature sensor;

[0008] S2, after the pixel headlight receives the image data information, the key areas and auxiliary areas are lit for image projection;

[0009] S3, the temperature of the pixel headlight T n >T标准 Whether it is true or not, where T n T represents the real-time temperature of the corresponding key and auxiliary areas. 标准 The set standard temperature is used. If it is true, proceed to S4; otherwise, repeat S3.

[0010] S4. The corresponding key areas and auxiliary areas begin to reduce their limits, entering S5;

[0011] S5, Determine K 辅助 ≤K fast If the condition is met, then the auxiliary area will be reduced in amount, where K... 辅助 K represents the temperature change rate of the auxiliary region adjacent to the key area of ​​overheating. fast If the set temperature change rate is met, the auxiliary area adjacent to the overheating key area will be derated and proceed to S6; otherwise, proceed to S7.

[0012] S6, Determine T n ≤T 回滞 Whether it is true or not, T 回滞 Return the temperature value for the region. If the condition is met, return to S2; otherwise, return to S4.

[0013] S7, Determine K 辅助 ≤K mid If true, the auxiliary region is closed and the process returns to S6; otherwise, K is checked. 重点 ≤K slow If the condition is met, perform frame interpolation and de-rating; otherwise, perform overall de-rating and return to S6, where K... 重点 K represents the rate of temperature change in the key area. mid and K slow To reduce heat generation by using partition derating or frame interpolation derating to set the temperature change rate, the overall image clarity and brightness are maintained.

[0014] Furthermore, in S2, the image data information includes a frame header, a data segment, and a frame tail. The frame header contains file format, file size, resolution, and module area calibration information. The data segment contains pixel information of the projected image, and the frame tail contains CRC check data.

[0015]

[0016] Where K represents the temperature change rate corresponding to the key area and the auxiliary area, and T J Δt is the junction temperature parameter of the pixel unit, Δt is the derating interval time, ΔT is the derating temperature difference, and λ is the derating trend factor. The temperature changes of each zone are judged comprehensively to ensure the accuracy of temperature control.

[0017] Furthermore, in S1, the pixel headlights are controlled by a main control chip, which includes a video input unit, a CAN bus, an MCU, a GPU, a deserializer, a serializer, and flash memory. The video input unit receives image data and inputs it to the deserializer. After the deserializer deserializes the data, it is input to the MCU and GPU for decoding. The decoded image data is input to the serializer for serialization, and then the serialized image data is transmitted to each pixel unit on the pixel headlight to light it up. The CAN bus is used for data transmission, including the conversion and transmission of image data.

[0018] Furthermore, the pixel headlights are controlled by the main control chip and powered by the power management chip. The power management chip includes a buck circuit and a low-dropout regulator circuit. The input electrical energy is fed into each pixel unit after passing through the buck circuit and the low-dropout regulator circuit to power the pixel unit.

[0019] Preferably, in S1, the display image is divided into multiple regions on the light source board composed of pixel units, and data information is calibrated in each region. The key regions are calibrated as 1, and the auxiliary regions are calibrated as 0, which facilitates internal data recognition.

[0020] In S1, the pixel units are controlled by PWM, which provides accurate control and a high refresh rate.

[0021] Preferably, in S7, frame interpolation and de-derating refers to achieving clarity and brightness by inserting a certain amount of de-drated frames between normal frames.

[0022] More preferably, in S1, the temperature sensor is a thermistor, the pixel unit is an LED, and the brightness control is accurate.

[0023] The second objective of this invention is to provide an automotive lighting control system that solves the problem of overheating in existing pixel headlights on automobiles.

[0024] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows:

[0025] An automotive lighting control system is used to implement the aforementioned pixel headlight dynamic thermal management method, thereby ensuring image clarity and brightness.

[0026] The beneficial effects of this invention are as follows:

[0027] (1) In the process of derated after the pixel unit overheats, the pixel unit is divided into key area and auxiliary area. A temperature sensor is set in each area. The brightness of the key area and auxiliary area is dynamically adjusted by the thermal change trend of each area. Under the premise of maintaining the overall temperature, the brightness and clarity of the projected image in the key area remain unchanged.

[0028] (2) The pixel headlight dynamic thermal management method adopts the method of partition derating and frame interpolation derating to dynamically adjust the brightness of the projected image of each partition, so as to ensure that the key areas can project images normally to realize the illumination and indication functions of the pixel headlight. Attached Figure Description

[0029] Figure 1 A system block diagram of a pixel headlight provided by the present invention;

[0030] Figure 2 This is a schematic diagram of the pixel headlight partition provided by the present invention;

[0031] Figure 3 This invention provides a mapping diagram of key and auxiliary areas on a pixel headlight.

[0032] Figure 4 A graph showing the temperature change over time in each zone of the pixel headlight provided by the present invention;

[0033] Figure 5 A flowchart of the pixel headlight dynamic thermal management method provided by the present invention;

[0034] Figure 6 This is a schematic diagram of frame interpolation derating provided by the present invention. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1

[0037] like Figures 1-6 As shown, this embodiment discloses a dynamic thermal management method for pixel headlights, including the following:

[0038] S1. Initialize the pixel headlight controller by dividing the pixel units on the pixel headlight into two categories: key areas and auxiliary areas. Each key area and auxiliary area is equipped with a separate temperature sensor. The temperature sensor detects the temperature and the rate of temperature change of the key area and auxiliary area in real time.

[0039] S2. After receiving image data information, the pixel headlight illuminates the key areas and auxiliary areas to project the image. The key areas and auxiliary areas are illuminated by the real-time refreshed image data to complete the outward projection of the image.

[0040] S3, Determine the pixel headlight T n >T标准 Whether it is true or not, where T n T represents the real-time temperature of the corresponding key and auxiliary areas. 标准 If the set standard temperature is met, proceed to S4; otherwise, repeat S3. Set the standard temperature based on the pixel unit temperature resistance data obtained from the experimental test.

[0041] S4. The corresponding key areas and auxiliary areas begin to reduce their limits, and then enter S5 to prevent the pixel headlight from overheating and failing.

[0042] S5, Determine K 辅助 ≤K fast If the condition is met, then the auxiliary area will be reduced in amount, where K... 辅助 K represents the temperature change rate of the auxiliary region adjacent to the key area of ​​overheating. fast If the set temperature change rate is met, the auxiliary area adjacent to the overheating key area will be derated and proceed to S6; otherwise, proceed to S7.

[0043] S6, Determine T n ≤T 回滞 Whether it is true or not, T 回滞 Return the temperature value for the region. If the condition is met, return to S2; otherwise, return to S4.

[0044] S7, Determine K 辅助 ≤K mid If true, the auxiliary region is closed and the process returns to S6; otherwise, K is checked. 重点 ≤K slow If the condition is met, perform frame interpolation and de-rating; otherwise, perform overall de-rating and return to S6, where K... 重点 K represents the rate of temperature change in the key area. mid and K slow The set temperature change rate was selected based on experimental data from different pixel units.

[0045] See Figure 6 The pixel unit is dimmed by PWM to control the light intensity. The PWM controls the light intensity according to the thermal trend change of the pixel unit, realizing dynamic adjustment of the light, thereby maintaining the overall brightness while controlling the heat.

[0046] Furthermore, in S2, the image data information includes a frame header, a data segment, and a frame tail. The frame header contains file format, file size, resolution, and module area calibration information. The data segment contains pixel information of the projected image. The frame tail contains CRC check data. The image data information includes the color, size, and brightness information of the projected image, which is used to realize pixel headlights.

[0047] Furthermore,

[0048]

[0049] Where K represents the temperature change rate corresponding to the key area and the auxiliary area, and T J K represents the junction temperature parameter of the pixel unit, Δt is the derating interval time, ΔT is the derating temperature difference, β is the heat dissipation coefficient of the light source, α is the heat dissipation system of the lamp structure, and λ is the derating trend factor. fast K mid and K slow These are the fast derating rate, medium derating rate, and low derating rate, calibrated based on experimental data from pixel headlights.

[0050] Furthermore, in S1, the pixel headlights are controlled by a main control chip, which includes a video input unit, a CAN bus, an MCU, a GPU, a deserializer, a serializer, and flash memory. The video input unit receives image data and inputs it to the deserializer. After the deserializer deserializes the data, it is input to the MCU and GPU for decoding. The decoded image data is input to the serializer for serialization, and then the serialized image data is transmitted to each pixel unit on the pixel headlight to light it up. The CAN bus is used for data transmission.

[0051] Furthermore, the pixel headlights are controlled by the main control chip and powered by the power management chip. The power management chip includes a buck circuit and a low-dropout regulator circuit. The input electrical energy is then input to each pixel unit after passing through the buck circuit and the low-dropout regulator circuit.

[0052] Furthermore, in S1, the display image is divided into multiple regions on the light source board composed of pixel units, and data information is calibrated in each region, with key regions calibrated as 1 and auxiliary regions calibrated as 0.

[0053] Preferably, in S1, the pixel unit is controlled using PWM.

[0054] Preferably, in S7, frame interpolation and de-derating refers to inserting a certain amount of de-drated frames between normal frames.

[0055] Preferably, in S1, the temperature sensor is a thermistor and the pixel unit is an LED.

[0056] The specific strategy of this pixel-based headlight dynamic thermal management method is as follows:

[0057] Strategy 1, Auxiliary Area Reduction: When the vehicle system detects the temperature T in the image pre-projection area... n >T 标准 When a high-temperature devaluation is triggered, if the temperature change rate K of the auxiliary area adjacent to the key area is... 辅助 ≤K fastAt this time, auxiliary area derating is performed, reducing the PWM value of the pixel unit of the projected image in the auxiliary area. By reducing the temperature of the auxiliary area, the temperature of the key area is also reduced, ensuring that the brightness and sharpness of the projected image in the key area remain unchanged. If T 标准 ≤T n ≤T 回滞 If the temperature derating continues, the appropriate derating mode will be selected based on different K values ​​until the temperature T reaches its maximum. n ≤T 回滞 When the auxiliary area's image PWM value returns to normal output, the image is displayed normally, and the system enters normal working state.

[0058] Strategy 2, Auxiliary Region Closure: Based on auxiliary region de-frustrating, the software detects the temperature change rate K in the image pre-projection area. fast <K 辅助 ≤K mid When the auxiliary area is turned off, the projected image in the auxiliary area is not displayed, thereby reducing the temperature and ensuring that the projected image in the key area is displayed normally, achieving the effect of maintaining image brightness and clarity. At this time, if T... 标准 ≤T n ≤T 回滞 If the temperature derating continues, the appropriate derating mode will be selected based on the different values ​​of K, until T... n ≤T 回滞 When the auxiliary area image PWM value returns to normal output, the image is displayed normally, and the system returns to normal working state.

[0059] Strategy 3, Frame Interpolation and Reduction: After the auxiliary region is turned off, if the pre-projection region K... 重点 ≤K slow At that time, perform frame interpolation and de-rating, see [link / reference]. Figure 6 If 30 frames of the projected image need to be projected within one second in the key area, the PWM output of the interval frames will be dynamically adjusted according to the temperature trend to reduce the temperature while ensuring that the brightness of the projected image does not decrease. At this time, if T... 标准 ≤T n ≤T 回滞 If the temperature derating continues, the appropriate derating mode will be selected based on different K values ​​until T... n ≤T 回滞 Once the PWM value of the interval frame returns to the normal frame output, the image is displayed normally, and the system returns to normal operation.

[0060] Strategy 4, Overall De-rating: After the frame interpolation de-rating strategy is implemented, if the temperature change rate K of the lamp panel... 重点 >K slow Then, an overall throttling is performed, reducing the frame rate of the pre-projected key areas of the projected image, such as reducing the output from 30 frames per second to 15 frames per second, in order to reduce the temperature of the lamp panel. At this time, if T...标准 ≤T n ≤T 回滞 Then, temperature derating continues, selecting the appropriate derating mode based on different K values, until T... n ≤T 回滞 The projected image PWM value returns to normal output, the image is displayed normally, and it returns to normal working state, preventing overheating damage to the pixel headlights.

[0061] Example 2

[0062] This embodiment also discloses an automotive lighting control system for implementing a dynamic thermal management method for pixel headlights. By partitioning and frame interpolation, the system reduces the heat generation of automotive lights, ensuring the brightness and clarity of the illumination.

[0063] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and any modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A dynamic thermal management method for pixel headlights, characterized in that, Includes the following steps: S1. Initialize the pixel headlight controller, divide the pixel units on the pixel headlight into two categories: key areas and auxiliary areas, and configure a separate temperature sensor for each key area and auxiliary area; S2. After receiving image data information, the pixel headlights illuminate the key and auxiliary areas to project the image. S3, Determine the pixel headlight Whether it is valid, among which This refers to the real-time temperature of the corresponding key and auxiliary areas. The set standard temperature is used. If it is true, proceed to S4; otherwise, repeat S3. S4. The corresponding key areas and auxiliary areas begin to reduce their limits, entering S5; S5, Judgment If the condition is met, then the auxiliary area will be reduced in amount. The temperature change rate of the auxiliary area adjacent to the key area of ​​overheating. If the set temperature change rate is met, the auxiliary area adjacent to the overheating key area will be derated and proceed to S6; otherwise, proceed to S7. S6, Judgment Whether it is valid, Return the temperature value for the region. If the condition is met, return to S2; otherwise, return to S4. S7, Judgment If the condition is met, the auxiliary region is closed and the process returns to S6; otherwise, the condition is checked. If the condition is met, perform frame interpolation and de-rating; otherwise, perform overall de-rating and return to S6. For the temperature change rate of key areas, The set temperature change rate.

2. The pixel headlight dynamic thermal management method according to claim 1, characterized in that: In S2, the image data information includes a frame header, a data segment, and a frame tail. The frame header contains the file format, file size, resolution, and module area calibration information. The data segment contains the pixel information of the projected image, and the frame tail contains CRC check data.

3. The pixel headlight dynamic thermal management method according to claim 2, characterized in that: Where K represents the temperature change rate corresponding to the key area and the auxiliary area. These are the junction temperature parameters for the pixel unit. This refers to the interval between rate reductions. To reduce the temperature difference, The heat dissipation coefficient of the light source. The heat dissipation coefficient of the lighting structure, This is a factor indicating a decreasing trend.

4. The pixel headlight dynamic thermal management method according to claim 3, characterized in that: In S1, the pixel headlights are controlled by the main control chip, which includes a video input unit, a CAN bus, an MCU, a GPU, a deserializer, a serializer, and flash memory. The video input unit receives the image data and inputs it to the deserializer. After the deserializer deserializes the data, it is input to the MCU and GPU for decoding. The decoded image data is input to the serializer for serialization, and then the serialized image data is transmitted to each pixel unit on the pixel headlight to light it up. The CAN bus is used for data transmission.

5. The pixel headlight dynamic thermal management method according to claim 4, characterized in that: The pixel headlights are controlled by the main control chip and powered by the power management chip. The power management chip includes a buck circuit and a low-dropout regulator circuit. The input power is fed into each pixel unit after passing through the buck circuit and the low-dropout regulator circuit.

6. The pixel headlight dynamic thermal management method according to claim 5, characterized in that: In S1, the display image is divided into multiple regions on the light source board composed of pixel units. Data information is calibrated in each region, with key regions calibrated as 1 and auxiliary regions calibrated as 0.

7. The pixel headlight dynamic thermal management method according to claim 6, characterized in that: In S1, the pixel unit is controlled using PWM.

8. The pixel headlight dynamic thermal management method according to claim 7, characterized in that: In S7, frame interpolation de-derating refers to inserting a certain number of de-drated frames between normal frames.

9. The pixel headlight dynamic thermal management method according to claim 1, characterized in that: In S1, the temperature sensor is a thermistor, and the pixel unit is an LED.

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