Vehicle lamp control method, vehicle lamp control device and vehicle lamp

Abstract

The invention provides a car lamp control method. The car lamp control method comprises the following steps that the environment temperature of the environment where a car lamp is located, and the circuit board temperature, the buck-boost chip junction temperature and the lamp panel temperature of the car lamp are collected; according to the environment temperature, the circuit board temperature, the buck-boost chip junction temperature and the lamp panel temperature, first expected power, second expected power, third expected power and fourth expected power corresponding to the environment temperature, the circuit board temperature, the buck-boost chip junction temperature and the lamp panel temperature are determined; and the minimum value in the power is selected as ideal output power, and the vehicle lamp is controlled to work at the ideal output power. The invention further provides a vehicle lamp control and a vehicle lamp applying the vehicle lamp control method.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a vehicle light control method, a vehicle light control device and a vehicle light. Background Art

[0002] With the technological advancement in the automotive field, the functionality of car headlights has been significantly enhanced, providing drivers with a rich technological experience. However, the increase in functionality has also brought about an increase in the complexity of the headlight system, and the requirements for performance have become more stringent, especially the requirements for reliability. The basic function of the headlight system is to provide lighting, but with the continuous introduction of new functions, its internal structure has become more complex, and the complexity of the software has also increased. In this context, temperature management and intelligent control inside the headlight have become key technical problems that need to be solved urgently.

[0003] At present, the temperature management method commonly used in the industry is relatively simple, mainly through the acquisition of thermistor signals on the lamp board to achieve segmented derating control, or adopt a two-stage control strategy, that is, when the temperature is below a certain threshold, the headlights run at full power, and when the temperature exceeds the threshold, the headlights are turned off. Although these traditional methods can deal with temperature problems to a certain extent, they still have great safety risks in improving the service life of headlights and system reliability.

[0004] Therefore, how to more effectively manage the temperature inside the car headlights and ensure that the headlight system can operate stably and reliably under various environmental conditions, thereby improving the service life and safety of the headlights, is an urgent problem to be solved. Summary of the invention

[0005] The purpose of the present invention is to address the corresponding deficiencies of the prior art and provide a headlight control method, a headlight control device and a headlight. By collecting various temperatures inside and outside the headlight as reference indicators and making comprehensive considerations, a more ideal output power is determined, thereby effectively improving the life of the headlight and its control module and reducing the failure rate.

[0006] The objective of the present invention is achieved by adopting the following scheme:

[0007] A first aspect of the present invention provides a vehicle light control method, comprising the following steps:

[0008] S1, collecting the ambient temperature of the environment where the headlight is located, as well as the circuit board temperature of the headlight, the junction temperature of the buck-boost chip, and the lamp board temperature;

[0009] S2, determining a first expected power, a second expected power, a third expected power, and a fourth expected power corresponding to the ambient temperature, the circuit board temperature, the buck-boost chip junction temperature, and the lamp board temperature, respectively, according to the ambient temperature, the circuit board temperature, the buck-boost chip junction temperature, and the lamp board temperature;

[0010] S3, selecting a minimum value among the first expected power, the second expected power, the third expected power, and the fourth expected power as an ideal output power, and controlling the vehicle light to operate at the ideal output power.

[0011] Preferably, the determining the first expected power corresponding to the ambient temperature comprises the following operations:

[0012] When the ambient temperature is not higher than a preset first temperature threshold, determining the first expected power as the maximum output power of the vehicle lamp;

[0013] When the ambient temperature is between the first temperature threshold and a preset second temperature threshold higher than the first temperature threshold, it is determined that the first expected power is between the maximum output power of the vehicle lamp and the preset first power threshold, and the relationship between the first expected power and the ambient temperature is P=k 1 t 1+ b 1 , where P is the first expected power, k 1 is the preset first proportional coefficient, t 1 is the ambient temperature, b 1 is a preset first power correction constant;

[0014] When the ambient temperature rises from the second temperature threshold to a preset third temperature threshold higher than the second temperature threshold, determining that the first expected power is 0, and when the ambient temperature decreases from the third temperature threshold to the second temperature threshold, determining that the first expected power is restored to the first power threshold;

[0015] When the ambient temperature is higher than a preset third temperature threshold, the first expected power is determined to be 0.

[0016] Preferably, the determining of the second expected power corresponding to the circuit board temperature comprises the following operations:

[0017] When the temperature of the circuit board is not higher than a preset fourth temperature threshold, determining the second expected power as the maximum output power of the vehicle lamp;

[0018] When the circuit board temperature is between the fourth temperature threshold and a preset fifth temperature threshold higher than the fourth temperature threshold, it is determined that the second expected power is between the maximum output power of the vehicle lamp and the preset first power threshold, and the relationship between the second expected power and the circuit board temperature is P=k 2 t 2+ b 2 , where P is the second expected power, k 2 is the preset second proportional coefficient, t 2 is the circuit board temperature, b 2 is a preset second power correction constant;

[0019] When the temperature of the circuit board rises from the fifth temperature threshold to a preset sixth temperature threshold higher than the fifth temperature threshold, the second expected power is determined to be 0; when the temperature of the circuit board decreases from the sixth temperature threshold to the fifth temperature threshold, the second expected power is determined to be restored to the first power threshold;

[0020] When the temperature of the circuit board is higher than a preset sixth temperature threshold, the second expected power is determined to be 0.

[0021] Preferably, the determining of the third expected power corresponding to the junction temperature of the buck-boost chip comprises the following operations:

[0022] When the junction temperature of the buck-boost chip is not higher than a preset seventh temperature threshold, determining the third expected power as the maximum output power of the vehicle lamp;

[0023] When the junction temperature of the buck-boost chip is between the seventh temperature threshold and a preset eighth temperature threshold higher than the seventh temperature threshold, it is determined that the third expected power is between the maximum output power of the vehicle lamp and the preset first power threshold, and the relationship between the third expected power and the buck-boost chip junction temperature is: Where P is the third expected power, t 3 is the junction temperature of the buck-boost chip, σ and μ are the preset first calibration coefficient and second calibration coefficient respectively;

[0024] When the junction temperature of the buck-boost chip rises from the eighth temperature threshold to a ninth temperature threshold preset higher than the eighth temperature threshold, the third expected power is determined to be 0; and when the circuit board temperature decreases from the ninth temperature threshold to the eighth temperature threshold, the third expected power is determined to be restored to the first power threshold;

[0025] When the junction temperature of the buck-boost chip is higher than a preset ninth temperature threshold, the third expected power is determined to be 0.

[0026] Preferably, the determining the fourth expected power corresponding to the temperature of the lamp board comprises the following operations:

[0027] When the temperature of the lamp board is not higher than a preset tenth temperature threshold, determining that the fourth expected power is at a preset first power threshold;

[0028] When the lamp board temperature is between the tenth temperature threshold and a preset eleventh temperature threshold higher than the tenth temperature threshold, it is determined that the fourth expected power is between the preset first power threshold and the maximum output power of the vehicle lamp, and the relationship between the fourth expected power and the lamp board temperature is Where P is the fourth expected power, t 4 is the lamp board temperature, α and β are the preset third calibration coefficient and fourth calibration coefficient respectively;

[0029] When the temperature of the lamp board is between the eleventh temperature threshold and a twelfth temperature threshold that is preset and higher than the eleventh temperature threshold, determining the fourth expected power as the maximum output power of the vehicle lamp;

[0030] When the lamp board temperature is between the twelfth temperature threshold and a preset thirteenth temperature threshold higher than the twelfth temperature threshold, it is determined that the fourth expected power is between the maximum output power of the vehicle lamp and the preset second power threshold, and the relationship between the fourth expected power and the lamp board temperature is Where P is the fourth expected power, t 4 is the lamp board temperature, δ and ε are the preset fifth and sixth calibration coefficients respectively;

[0031] When the temperature of the lamp board rises from the thirteenth temperature threshold to the fourteenth temperature threshold that is preset and higher than the thirteenth temperature threshold, the fourth expected power is determined to be 0, and when the temperature of the circuit board decreases from the fourteenth temperature threshold to the thirteenth temperature threshold, the fourth expected power is determined to be restored to the second power threshold;

[0032] When the temperature of the lamp board is higher than a preset fourteenth temperature threshold, the fourth expected power is determined to be 0.

[0033] Preferably, collecting the temperature of the circuit board includes the following operations:

[0034] A circuit board thermistor is arranged on the circuit board, and the temperature of the circuit board is collected through the circuit board thermistor.

[0035] Preferably, collecting the junction temperature of the buck-boost chip includes the following operations:

[0036] A plurality of buck-boost chips are arranged on the lamp board, and junction temperature collection values ​​of the plurality of buck-boost chips are respectively obtained, and the highest value among the junction temperature collection values ​​is used as the junction temperature of the buck-boost chip.

[0037] Preferably, collecting the temperature of the lamp panel includes the following operations:

[0038] A lamp board thermistor is arranged on the lamp board, and a first lamp board temperature collection value is obtained through the lamp board thermistor;

[0039] A matrix management chip is arranged on the lamp board, and a temperature collection value of the second lamp board is acquired through the matrix management chip;

[0040] The higher value between the first lamp board temperature collection value and the second lamp board temperature collection value is used as the lamp board temperature.

[0041] A second aspect of the present invention provides a vehicle light control device, comprising:

[0042] A temperature acquisition module is used to collect the lamp board temperature, circuit board temperature, buck-boost chip junction temperature, and ambient temperature of the environment in which the lamp is located;

[0043] A control module is used to determine a first expected power, a second expected power, a third expected power, and a fourth expected power corresponding to the ambient temperature, the circuit board temperature, the buck-boost chip junction temperature, and the lamp board temperature, respectively, according to the ambient temperature, the circuit board temperature, the buck-boost chip junction temperature, and the lamp board temperature, and select a minimum value among the first expected power, the second expected power, the third expected power, and the fourth expected power as an ideal output power to control the vehicle lamp to operate at the ideal output power.

[0044] A third aspect of the present invention provides a vehicle lamp, comprising the above-mentioned vehicle lamp control device.

[0045] The above-mentioned embodiment of the present invention collects four temperatures of the outside and inside of the car lamp, namely, the ambient temperature, the circuit board temperature, the junction temperature of the buck-boost chip, and the lamp board temperature as reference indicators for determining the power of the car lamp, and establishes corresponding ideal power output curves according to the temperatures of each aspect, and determines the expected power of the car lamp according to four ways respectively, and then selects the minimum value from the expected powers determined by the four ways as the ideal output power of the car lamp to control the car lamp. In this way, it is ensured as much as possible that the requirements of different reference indicators for output power are met at the same time, while also taking into account the needs of energy saving, which helps to extend the service life of the car lamp and reduce the failure rate of the car lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a flow chart of a vehicle light control method according to an embodiment of the present invention;

[0047] Figure 2 is a functional relationship diagram for determining the first expected power according to the ambient temperature in the vehicle light control method according to an embodiment of the present invention;

[0048] Figure 3 is a functional relationship diagram for determining the second expected power according to the circuit board temperature in the vehicle light control method according to an embodiment of the present invention;

[0049] Figure 4 is a functional relationship diagram for determining the third expected power according to the junction temperature of the buck-boost chip in the vehicle light control method according to an embodiment of the present invention;

[0050] Figure 5 is a functional relationship diagram of determining the fourth expected power according to the temperature of the lamp board in the vehicle lamp control method according to the embodiment of the present invention;

[0051] Figure 6 FIG. 4 is a structural block diagram of a vehicle light control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The embodiment of the first aspect of the present invention provides a vehicle light control method, which can be applied to various vehicles such as cars, trucks, and engineering machinery, and is specifically used to control the headlights of these vehicles, such as high beams and low beams.

[0053] like Figure 1 As shown, the vehicle light control method may include the following steps:

[0054] S1, collects the ambient temperature of the environment where the headlight is located, as well as the circuit board temperature of the headlight, the junction temperature of the buck-boost chip, and the lamp board temperature.

[0055] Specifically, the ambient temperature may be acquired by an ambient temperature sensor (ATS).

[0056] The circuit board temperature may be acquired by setting a circuit board thermistor (NTC) on the circuit board and acquiring the circuit board temperature through the circuit board thermistor.

[0057] The junction temperature of the buck-boost chip can be obtained by setting multiple buck-boost chips (commonly referred to as BUCK chips in the industry) on the lamp board of the vehicle lamp, respectively obtaining the junction temperature collection values ​​of the multiple buck-boost chips, taking the highest value of the junction temperature collection values ​​as the junction temperature of the buck-boost chip, and calculating the derating power according to the temperature of the BUCK chip with the highest junction temperature to ensure that the output currents of the lamp boards corresponding to the position lights are the same, that is, the brightness is consistent.

[0058] The lamp board temperature can be obtained by setting a lamp board thermistor on the lamp board and obtaining a first lamp board temperature acquisition value through the lamp board thermistor, or setting a matrix management chip (LMM) on the lamp board and obtaining a second lamp board temperature acquisition value through the matrix management chip LMM, and taking the higher value of the first lamp board temperature acquisition value and the second lamp board temperature acquisition value as the lamp board temperature. If one of the temperatures fails, it does not affect the temperature acquisition of the headlight lamp board. The two temperatures are compared and the larger value is taken for control, which can better protect the lamp and increase the life of the lamp.

[0059] S2, according to the ambient temperature, circuit board temperature, buck-boost chip junction temperature, and lamp board temperature, determine the first expected power, the second expected power, the third expected power, and the fourth expected power corresponding to the ambient temperature, the circuit board temperature, the buck-boost chip junction temperature, and the lamp board temperature respectively.

[0060] Specifically, a specific method for determining the first expected power according to the ambient temperature T1 is as follows: Figure 2 shown.

[0061] When the ambient temperature T1 is not higher than the preset first temperature threshold Ta, the first expected power P is determined to be 100% of the maximum output power of the vehicle lamp.

[0062] When the ambient temperature T1 is between the first temperature threshold Ta and a preset second temperature threshold Tb1 higher than the first temperature threshold, the corresponding lamp board is controlled to output at a reduced rate, and the first expected power P is determined to be between the maximum output power of the lamp and the preset first power threshold P11, and the relationship between the first expected power and the ambient temperature is P=k 1 t 1 +b 1 , where P is the first expected power, k 1 is the preset first proportional coefficient, t 1 is the ambient temperature, b 1 is the preset first power correction constant.

[0063] When the ambient temperature T1 rises from the second temperature threshold Tb to the preset third temperature threshold Tb1 higher than the second temperature threshold, the first expected power is determined to be 0, and when the ambient temperature decreases from the third temperature threshold Tb1 to the second temperature threshold Tb, the first expected power is determined to be restored to the first power threshold P11. The second temperature threshold Tb to the third temperature threshold Tb1 is a hysteresis control interval, which effectively avoids the flickering problem of the headlight when the headlight or the control module is in a critical temperature jump.

[0064] When the ambient temperature T1 is higher than the preset third temperature threshold Tb1, the first expected power is determined to be 0, all turned-on light panels are turned off, and a fault signal is sent to the instrument to prompt the driver.

[0065] Specifically, a specific method for determining the second expected power according to the circuit board temperature T2 is as follows: Figure 3 shown.

[0066] When the circuit board temperature T2 is not higher than the preset fourth temperature threshold Tc, the second expected power is determined to be 100% of the maximum output power of the vehicle lamp.

[0067] When the circuit board temperature T2 is between the fourth temperature threshold Tc and a preset fifth temperature threshold Td higher than the fourth temperature threshold, the corresponding lamp board is controlled to output at a reduced rate, and the second expected power is determined to be between the maximum output power of the lamp and the preset first power threshold P21, and the relationship between the second expected power and the circuit board temperature is P=k 2 t 2 +b 2 , where P is the second expected power, k 2 is the preset second proportional coefficient, t 2 is the circuit board temperature, b 2is the preset second power correction constant.

[0068] When the circuit board temperature T2 rises from the fifth temperature threshold Td to the preset sixth temperature threshold Td1 higher than the fifth temperature threshold, the second expected power is determined to be 0, and when the circuit board temperature decreases from the sixth temperature threshold Td1 to the fifth temperature threshold Td, the second expected power is determined to be restored to the first power threshold P21. The fifth temperature threshold Td to the sixth temperature threshold Td1 is a hysteresis control interval, which effectively avoids the flickering problem of the headlight when the headlight or the control module is in a critical temperature jump.

[0069] When the circuit board temperature T2 is higher than the preset sixth temperature threshold Td1, the second expected power is determined to be 0. All turned-on light boards are turned off, and a fault signal is sent to the instrument to prompt the driver.

[0070] Specifically, a specific method for determining the third expected power according to the buck-boost chip junction temperature T3 is as follows: Figure 4 shown.

[0071] When the buck-boost chip junction temperature T3 is not higher than a preset seventh temperature threshold T30, the third expected power is determined to be 100% of the maximum output power of the vehicle lamp.

[0072] When the junction temperature T3 of the buck-boost chip is between the seventh temperature threshold T30 and the eighth temperature threshold T31 which is preset and higher than the seventh temperature threshold, the light output starts to be derated, and the third expected power is determined to be between the maximum output power of the vehicle light and the preset first power threshold P2, and the relationship between the third expected power and the junction temperature of the buck-boost chip is: Where P is the third expected power, t 3 To increase or decrease the junction temperature of the chip, σ and μ are the preset first calibration coefficient and the second calibration coefficient respectively.

[0073] When the junction temperature T3 of the buck-boost chip rises from the eighth temperature threshold T32 to the ninth temperature threshold T33 which is preset and higher than the eighth temperature threshold, the third expected power is determined to be 0, and when the circuit board temperature decreases from the ninth temperature threshold T33 to the eighth temperature threshold T32, the third expected power is determined to be restored to the first power threshold P2. The eighth temperature threshold T32 to the ninth temperature threshold T33 is a hysteresis control interval, which effectively avoids the flickering problem of the headlight when the headlight or the control module is in a critical temperature jump.

[0074] When the buck-boost chip junction temperature T3 is higher than a preset ninth temperature threshold T33, the third expected power is determined to be 0.

[0075] Specifically, a specific method for determining the fourth expected power according to the lamp board temperature T4 is as follows: Figure 5 shown.

[0076] The lamp board temperature T4 and the fourth desired power control curve are divided into 5 sections, namely, low temperature constant power curve section, low temperature derating curve section, full power output curve section, high temperature derating curve section and hysteresis curve section.

[0077] When the lamp board temperature T4 is not higher than the preset tenth temperature threshold T40, it is a low temperature constant power curve segment. At this time, the temperature is very low. Considering the impact of temperature on the LED, a certain derating is performed to determine that the fourth expected power is at the preset first power threshold P41.

[0078] When the lamp board temperature T4 is between the tenth temperature threshold T40 and the preset eleventh temperature threshold T41 which is higher than the tenth temperature threshold, it is a low temperature derating curve segment, and the fourth expected power is determined to be between the preset first power threshold P21 and the maximum output power of the vehicle lamp, and the relationship between the fourth expected power and the lamp board temperature is Where P is the fourth expected power, t 4 is the lamp board temperature, α and β are the preset third calibration coefficient and fourth calibration coefficient respectively. In this temperature range, as the lamp board temperature increases, the output power also increases continuously until full power output.

[0079] When the lamp board temperature T4 is between the eleventh temperature threshold T41 and a preset twelfth temperature threshold T42 which is higher than the eleventh temperature threshold, the fourth expected power is determined to be 100% of the maximum output power of the vehicle lamp for the full power output curve segment.

[0080] When the lamp board temperature T4 is between the twelfth temperature threshold T42 and the preset thirteenth temperature threshold T43 which is higher than the twelfth temperature threshold, it is a high temperature derating curve segment, and it is determined that the fourth expected power is between the maximum output power of the lamp and the preset second power threshold P42, and the relationship between the fourth expected power and the lamp board temperature is Where P is the fourth expected power, t 4 is the lamp board temperature, δ and ε are the preset fifth and sixth calibration coefficients respectively. As the lamp board temperature continues to rise, the headlight control module begins to derate the lamp board continuously to ensure the working life of the LED and the safety of the headlight, and controls the fan to work to increase the heat dissipation of the headlight.

[0081] When the lamp board temperature T4 rises from the thirteenth temperature threshold T43 to the preset fourteenth temperature threshold T44 which is higher than the thirteenth temperature threshold, the fourth expected power is determined to be 0, and when the circuit board temperature decreases from the fourteenth temperature threshold T44 to the thirteenth temperature threshold T43, it is a hysteresis curve segment, and the fourth expected power is determined to be restored to the second power threshold P42. The thirteenth temperature threshold T43 to the fourteenth temperature threshold T44 is a hysteresis control interval, which effectively avoids the flickering problem of the headlight when the headlight or the control module is in a critical temperature jump.

[0082] When the lamp board temperature T4 is higher than a preset fourteenth temperature threshold T44, the fourth expected power is determined to be 0.

[0083] S3, selecting a minimum value among the first expected power, the second expected power, the third expected power, and the fourth expected power as an ideal output power, and controlling the vehicle light to operate at the ideal output power.

[0084] like Figure 6 As shown, an embodiment of another aspect of the present invention provides a vehicle light control device, which may include a temperature acquisition module 100 and a control module 200 .

[0085] The temperature acquisition module 100 is used to acquire temperature, and the control module 200 is used to control the power of the vehicle lamp according to the acquired temperature.

[0086] According to an embodiment of the present invention, the temperature acquisition module 100 is specifically used to collect the lamp board temperature, circuit board temperature, buck-boost chip junction temperature, and ambient temperature of the environment in which the lamp is located. The control module 200 is specifically used to determine the first expected power, the second expected power, the third expected power, and the fourth expected power corresponding to the ambient temperature, the circuit board temperature, the buck-boost chip junction temperature, and the lamp board temperature, respectively, according to the ambient temperature, the circuit board temperature, the buck-boost chip junction temperature, and the lamp board temperature, and select the minimum value of the first expected power, the second expected power, the third expected power, and the fourth expected power as the ideal output power, and control the lamp to work at the ideal output power. Comprehensive consideration is taken to formulate an ideal output power for each temperature, effectively prolonging the life of the headlight and the control module, and reducing its failure rate.

[0087] According to another aspect of the present invention, there is provided a vehicle lamp, comprising the vehicle lamp control device as described above.

[0088] In the vehicle light control method, vehicle light control device and vehicle light provided by the present invention, the power output of the vehicle light is comprehensively evaluated and determined by monitoring four key temperatures outside and inside the vehicle light, namely, the ambient temperature, the circuit board temperature, the junction temperature of the buck-boost chip and the lamp board temperature. For these four temperatures, corresponding ideal power output curves are constructed respectively, and the expected power of the vehicle light is calculated based on these curves. Subsequently, the minimum value among the expected powers obtained from these four ways is selected as the ideal output power of the vehicle light for control. This approach is intended to ensure that the output power of the vehicle light can meet the requirements of multiple reference indicators at the same time, while also fully considering the need for energy saving, helping to extend the service life of the vehicle light and effectively reducing the failure rate of the vehicle light.

Claims

1. A vehicle light control method, characterized in that: The following steps are involved: S1, collecting the ambient temperature of the environment where the headlight is located, as well as the circuit board temperature of the headlight, the junction temperature of the buck-boost chip, and the lamp board temperature; S2, determining a first expected power, a second expected power, a third expected power, and a fourth expected power corresponding to the ambient temperature, the circuit board temperature, the buck-boost chip junction temperature, and the lamp board temperature, respectively, according to the ambient temperature, the circuit board temperature, the buck-boost chip junction temperature, and the lamp board temperature; S3, selecting a minimum value among the first expected power, the second expected power, the third expected power, and the fourth expected power as an ideal output power, and controlling the vehicle light to operate at the ideal output power.

2. The vehicle light control method according to claim 1, characterized in that: The determining of the first expected power corresponding to the ambient temperature comprises the following operations: When the ambient temperature is not higher than a preset first temperature threshold, determining the first expected power as the maximum output power of the vehicle lamp; When the ambient temperature is between the first temperature threshold and a preset second temperature threshold higher than the first temperature threshold, it is determined that the first expected power is between the maximum output power of the vehicle lamp and the preset first power threshold, and the relationship between the first expected power and the ambient temperature is P=k1t 1+ b1, where P is the first expected power, k1 is the preset first proportional coefficient, t1 is the ambient temperature, and b1 is the preset first power correction constant; When the ambient temperature rises from the second temperature threshold to a preset third temperature threshold higher than the second temperature threshold, determining that the first expected power is 0, and when the ambient temperature decreases from the third temperature threshold to the second temperature threshold, determining that the first expected power is restored to the first power threshold; When the ambient temperature is higher than a preset third temperature threshold, the first expected power is determined to be 0.

3. The vehicle light control method according to claim 1, characterized in that: The determining of the second expected power corresponding to the circuit board temperature comprises the following operations: When the temperature of the circuit board is not higher than a preset fourth temperature threshold, determining the second expected power as the maximum output power of the vehicle lamp; When the circuit board temperature is between the fourth temperature threshold and a preset fifth temperature threshold higher than the fourth temperature threshold, it is determined that the second expected power is between the maximum output power of the vehicle lamp and the preset first power threshold, and the relationship between the second expected power and the circuit board temperature is P=k2t 2+ b2, where P is the second expected power, k2 is the preset second proportional coefficient, t2 is the circuit board temperature, and b2 is the preset second power correction constant; When the temperature of the circuit board rises from the fifth temperature threshold to a preset sixth temperature threshold higher than the fifth temperature threshold, the second expected power is determined to be 0; when the temperature of the circuit board decreases from the sixth temperature threshold to the fifth temperature threshold, the second expected power is determined to be restored to the first power threshold; When the temperature of the circuit board is higher than a preset sixth temperature threshold, the second expected power is determined to be 0.

4. The vehicle light control method according to claim 1, characterized in that: The determining of the third expected power corresponding to the junction temperature of the buck-boost chip comprises the following operations: When the junction temperature of the buck-boost chip is not higher than a preset seventh temperature threshold, determining the third expected power as the maximum output power of the vehicle lamp; When the junction temperature of the buck-boost chip is between the seventh temperature threshold and a preset eighth temperature threshold higher than the seventh temperature threshold, it is determined that the third expected power is between the maximum output power of the vehicle lamp and the preset first power threshold, and the relationship between the third expected power and the buck-boost chip junction temperature is: Wherein P is the third desired power, t3 is the junction temperature of the buck-boost chip, σ and μ are the preset first calibration coefficient and second calibration coefficient respectively; When the junction temperature of the buck-boost chip rises from the eighth temperature threshold to a ninth temperature threshold preset higher than the eighth temperature threshold, the third expected power is determined to be 0; and when the circuit board temperature decreases from the ninth temperature threshold to the eighth temperature threshold, the third expected power is determined to be restored to the first power threshold; When the junction temperature of the buck-boost chip is higher than a preset ninth temperature threshold, the third expected power is determined to be 0.

5. The vehicle light control method according to claim 1, characterized in that: The determining the fourth expected power corresponding to the temperature of the lamp panel comprises the following operations: When the temperature of the lamp board is not higher than a preset tenth temperature threshold, determining that the fourth expected power is at a preset first power threshold; When the lamp board temperature is between the tenth temperature threshold and a preset eleventh temperature threshold higher than the tenth temperature threshold, it is determined that the fourth expected power is between the preset first power threshold and the maximum output power of the vehicle lamp, and the relationship between the fourth expected power and the lamp board temperature is Wherein P is the fourth expected power, t4 is the lamp board temperature, α and β are the preset third calibration coefficient and fourth calibration coefficient respectively; When the temperature of the lamp board is between the eleventh temperature threshold and a twelfth temperature threshold that is preset and higher than the eleventh temperature threshold, determining the fourth expected power as the maximum output power of the vehicle lamp; When the lamp board temperature is between the twelfth temperature threshold and a preset thirteenth temperature threshold higher than the twelfth temperature threshold, it is determined that the fourth expected power is between the maximum output power of the vehicle lamp and the preset second power threshold, and the relationship between the fourth expected power and the lamp board temperature is Wherein P is the fourth expected power, t4 is the lamp board temperature, δ and ε are the preset fifth calibration coefficient and sixth calibration coefficient respectively; When the temperature of the lamp board rises from the thirteenth temperature threshold to the fourteenth temperature threshold that is preset and higher than the thirteenth temperature threshold, the fourth expected power is determined to be 0, and when the temperature of the circuit board decreases from the fourteenth temperature threshold to the thirteenth temperature threshold, the fourth expected power is determined to be restored to the second power threshold; When the temperature of the lamp board is higher than a preset fourteenth temperature threshold, the fourth expected power is determined to be 0.

6. The vehicle light control method according to claim 1, characterized in that: The collecting of the circuit board temperature comprises the following operations: A circuit board thermistor is arranged on the circuit board, and the temperature of the circuit board is collected through the circuit board thermistor.

7. The vehicle light control method according to claim 1, characterized in that: The step of collecting the junction temperature of the buck-boost chip comprises the following operations: A plurality of buck-boost chips are arranged on the lamp board, and junction temperature collection values ​​of the plurality of buck-boost chips are respectively obtained, and the highest value among the junction temperature collection values ​​is used as the junction temperature of the buck-boost chip.

8. The vehicle light control method according to claim 1, characterized in that: The collecting of the lamp board temperature comprises the following operations: A lamp board thermistor is arranged on the lamp board, and a first lamp board temperature collection value is obtained through the lamp board thermistor; A matrix management chip is arranged on the lamp board, and a temperature collection value of the second lamp board is acquired through the matrix management chip; The higher value between the first lamp board temperature collection value and the second lamp board temperature collection value is used as the lamp board temperature.

9. A vehicle light control device, characterized in that: include: A temperature acquisition module is used to collect the lamp board temperature, circuit board temperature, buck-boost chip junction temperature, and ambient temperature of the environment in which the lamp is located; A control module is used to determine a first expected power, a second expected power, a third expected power, and a fourth expected power corresponding to the ambient temperature, the circuit board temperature, the buck-boost chip junction temperature, and the lamp board temperature, respectively, according to the ambient temperature, the circuit board temperature, the buck-boost chip junction temperature, and the lamp board temperature, and select a minimum value among the first expected power, the second expected power, the third expected power, and the fourth expected power as an ideal output power to control the vehicle lamp to operate at the ideal output power.

10. A vehicle lamp, characterized in that: It comprises the vehicle light control device as claimed in claim 9.

Images