Headlamp light and shade cut-off line heating droop detection method and device and medium

Abstract

The invention discloses a headlight cut-off line heated droop detection method and device and a medium, and relates to the technical field of automobile headlight test.The headlight cut-off line heated droop detection method comprises the steps that a support is connected with a fixing frame, and an adjusting mechanism is controlled to drive a lamplight module to move to a measuring position; lightening a light module and starting timing to obtain illumination time; moving the illuminometer until the illuminance value of the illuminometer is a preset illuminance value; the angle measuring instrument is set to be zero, and the transparent sealing cover is arranged on the base in a covering mode; and when the illumination time is respectively 3 minutes and the preset time, the adjusting mechanism is controlled to adjust the position of the light module until the illumination value of the illuminometer is the preset illumination value, and the measurement value of the angle measuring instrument is obtained. The numerical value is directly obtained through the angle measuring instrument, so that measurement errors easily caused by manual measurement are avoided, the measurement accuracy is improved, the measurement frequency is reduced, and the measurement time and manpower are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive headlight testing, and particularly relates to a method, device and medium for detecting the heat-induced sag of the cut-off line of a headlight Background Art

[0002] According to regulatory requirements, under the influence of heat, the change in the vertical position of the cut-off line of the low beam should meet the regulatory requirements. That is, after the low beam is lit for a period of time, the optical axis of the low beam is heated, causing deformation of the internal structure of the lamp, and the module sags under the action of gravity. Therefore, it is necessary to test the heat-induced sag of the cut-off line of the low beam to ensure that it meets the regulatory requirements

[0003] In the existing test method, a whole lamp is used for testing. The position of the cut-off line is adjusted on a standard rotary table, and the low beam is projected onto a screen 10 m away, making the cut-off line horizontal. The heights h3 min and h60 min of the cut-off line on the screen at 3 minutes and 60 minutes are measured with a ruler. The height difference is determined through multiple repeated measurements, and then the corresponding sag angle Δα = arctan(h 3min / 10) - arctan(h 60min / 10) is calculated. Whether it meets the regulatory requirements is judged based on Δα. In this test method, the measured Δα is often not accurate enough, and it may occur that the Δα obtained during the test of a low beam that meets the regulatory requirements does not meet the regulatory requirements. Therefore, it is necessary to increase the number of measurements to ensure the reliability of the measurement results. However, each measurement requires waiting for 60 minutes, resulting in time-consuming and laborious Summary of the Invention

[0004] The main object of the present invention is to propose a method, device and medium for detecting the heat-induced sag of the cut-off line of a headlight, aiming to solve the technical problem of time-consuming and laborious of the existing test method for the change in the vertical position of the cut-off line of a low beam

[0005] To achieve the above object, the method for detecting the heat-induced sag of the cut-off line of a headlight proposed by the present invention is implemented based on a headlight test fixture. The headlight test fixture includes a base, an adjustment mechanism, a fixing frame, a bracket, an angle measuring instrument, a transparent sealing cover, a screen and an illuminance meter. The headlight test fixture further includes a screen and an illuminance meter arranged on the screen, and the illuminance meter is arranged facing the light-emitting side of the lighting module; the fixing frame is arranged on the top of the base; the bracket is used to connect with the lighting module, and the bracket is detachably connected to the fixing frame; the angle measuring instrument is arranged on the base and is used to measure the angle between the base and the horizontal plane; the transparent sealing cover covers the base, and the transparent sealing cover and the base enclose a closed cavity. The method for detecting the heat-induced sag of the cut-off line of a headlight includes the following steps

[0006] Connect the bracket to the fixing frame, and control the adjusting mechanism to drive the lighting module to move to the measurement position;

[0007] Light up the lighting module and start timing to obtain the lighting time;

[0008] Move the illuminometer until the illuminance value of the illuminometer is the preset illuminance value;

[0009] Zero the angle measuring instrument, and cover the transparent sealing cover on the base;

[0010] Judge whether the lighting time reaches 3 minutes;

[0011] If the lighting time reaches 3 minutes, control the adjusting mechanism to adjust the position of the lighting module until the illuminance value of the illuminometer is the preset illuminance value, and obtain the first measurement value of the angle measuring instrument;

[0012] Judge whether the lighting time reaches the preset time;

[0013] If the lighting time reaches the preset time, control the adjusting mechanism to adjust the position of the lighting module until the illuminance value of the illuminometer is the preset illuminance value, and obtain the second measurement value of the angle measuring instrument;

[0014] Obtain the test difference according to the first measurement value and the second measurement value.

[0015] In one embodiment, the step of controlling the adjusting mechanism to drive the lighting module to move to the measurement position includes:

[0016] Control the adjusting mechanism to drive the base to move until the top surface of the base is horizontal.

[0017] In one embodiment, a center point is provided on the screen; after the step of controlling the adjusting mechanism to drive the base to move until the top surface of the base is horizontal, the following steps are included:

[0018] Control the adjusting mechanism to drive the base to move until the inflection point of the light and dark cut-off line of the lighting module moves to the center point;

[0019] Control the adjusting mechanism to drive the base to rotate around the vertical direction until the distance from the inflection point of the light and dark cut-off line of the lighting module to the center point is the preset distance.

[0020] In one embodiment, the headlight test fixture further includes a first level gauge and a second level gauge. Both the first level gauge and the second level gauge are disposed on the top surface of the base. The first level gauge extends along a first direction, and the second level gauge extends along a second direction. The first direction and the second direction are perpendicularly arranged. The step of controlling the adjusting mechanism to drive the base to move until the top surface of the base is level includes:

[0021] Controlling the adjusting mechanism to drive the base to rotate around the second direction until the first level gauge indicates level;

[0022] Controlling the adjusting mechanism to drive the base to rotate around the first direction until the second level gauge indicates level.

[0023] In one embodiment, the step of, if the lighting time reaches 3 minutes, controlling the adjusting mechanism to adjust the position of the lighting module until the illuminance value of the illuminometer is a preset illuminance value and obtaining a first measurement value of the angle gauge includes:

[0024] If the lighting time reaches 3 minutes, controlling the adjusting mechanism to adjust the position of the lighting module until the illuminance value of the illuminometer is a preset illuminance value;

[0025] Zeroing the angle gauge and obtaining a first measurement value of the angle gauge.

[0026] In one embodiment, the headlight test fixture further includes a heating module. The headlight test fixture further includes a heating module group. The heating module group is disposed in the sealed cavity and is used to adjust the temperature of the sealed cavity. After the step of, if the lighting time reaches 3 minutes, controlling the adjusting mechanism to adjust the position of the lighting module until the illuminance value of the illuminometer is a preset illuminance value and obtaining a first measurement value of the angle gauge and before the step of determining whether the lighting time reaches a preset time, it includes:

[0027] Turning on the heating module group.

[0028] In one embodiment, the step of turning on the heating module group includes:

[0029] Obtaining the heating power of the heating module group;

[0030] Adjusting the heating module group to the heating power and turning on the heating module group.

[0031] In one embodiment, after the step of obtaining a test difference according to the first measurement value and the second measurement value includes:

[0032] Determine whether the test difference is qualified;

[0033] If the test difference is unqualified, repair the mold of the bracket.

[0034] The present invention also provides an electronic device, which includes: a memory, a processor, and a computer program stored on the memory and executable on the processor. The computer program is configured to implement the steps of the method for detecting the thermal sag of the cut-off line of the headlight in the above embodiment.

[0035] The present invention also provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, it implements the steps of the method for detecting the thermal sag of the cut-off line of the headlight in the above embodiment.

[0036] The technical solution of the present invention directly obtains the deflection angles of the base relative to the measurement position at 3 minutes and 60 minutes by using an angle measuring instrument, and can obtain Δα by obtaining the difference between these two angle values, avoiding the measurement errors that are likely to occur in manual measurement, thereby improving the measurement accuracy, reducing the number of measurements, and saving measurement time and manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0038] Figure 1 It is a schematic exploded view of an embodiment of the headlight test fixture provided by the present invention;

[0039] Figure 2 It is a schematic structural view of an embodiment of the headlight test fixture provided by the present invention;

[0040] Figure 3 It is a schematic structural view of another embodiment of the headlight test fixture provided by the present invention;

[0041] Figure 4 It is a schematic top view of an embodiment of the light module of the headlight test fixture provided by the present invention in the measurement position;

[0042] Figure 5 It is a schematic front view of an embodiment of the light module of the headlight test fixture provided by the present invention in the measurement position;

[0043] Figure 6Front view structural schematic diagram of an embodiment when the lighting module of the headlight test fixture provided by the present invention operates for 3 minutes;

[0044] Figure 7 Front view structural schematic diagram of an embodiment when the lighting module of the headlight test fixture provided by the present invention operates for a preset time;

[0045] Figure 8 Flow schematic diagram of the first embodiment of the method for detecting the thermal sag of the cut-off line of the headlight provided by the present invention;

[0046] Figure 9 Flow schematic diagram of the second embodiment of the method for detecting the thermal sag of the cut-off line of the headlight provided by the present invention;

[0047] Figure 10 Flow schematic diagram of the third embodiment of the method for detecting the thermal sag of the cut-off line of the headlight provided by the present invention;

[0048] Figure 11 Flow schematic diagram of the fourth embodiment of the method for detecting the thermal sag of the cut-off line of the headlight provided by the present invention;

[0049] Figure 12 Structural schematic diagram of an embodiment of the electronic device provided by the present invention.

[0050] Explanation of the reference numerals in the drawings:

[0051] 100, headlight test fixture; 1, base; 2, fixing frame; 21, first column; 22, second column; 23, fixing plate; 231, avoidance hole; 232, positioning hole; 3, bracket; 31, threaded fastener; 32, nut; 4, angle measuring instrument; 5, transparent sealing cover; 51, sealed cavity; 61, first level measuring instrument; 62, second level measuring instrument; 7, heating module; 8, adjusting mechanism; 9, screen; 10, illuminometer;

[0052] 200, lighting module;

[0053] 300, electronic device; 301, processing device; 302, ROM; 303, RAM; 304, bus; 305, I / O interface; 306, input device; 307, output device; 308, storage device; 309, communication device.

[0054] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0055] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0056] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0057] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0058] According to regulatory requirements, under the influence of heat, the change in the vertical position of the cut-off line of the low beam should meet the regulatory requirements. That is, after the low beam is lit for a period of time, the optical axis of the low beam is heated, causing the internal structure of the lamp to deform, and the module sags under the action of gravity. Therefore, it is necessary to test the sag of the cut-off line of the low beam under heat to ensure that it meets the regulatory requirements.

[0059] In the existing test method, a whole lamp is used for testing. The position of the cut-off line is adjusted on a standard rotary table, and the low beam is projected onto a screen 10 m away, and the cut-off line is placed in a horizontal position. The heights h3 min 、h60 min of the cut-off line on the screen at 3 minutes and 60 minutes are measured with a ruler. The height difference is determined by repeated measurements multiple times, and then the corresponding sag angle Δα = arctan(h 3min / 10) - arctan(h 60min / 10), it is determined whether it meets the regulatory requirements according to Δα; in this test method, the measured Δα is often not accurate enough, and it may occur that the Δα obtained during the test of a low beam lamp that meets the regulatory requirements cannot meet the regulatory requirements. Therefore, it is necessary to increase the number of measurements to ensure the reliability of the measurement results. However, each measurement requires waiting for 60 minutes, resulting in time-consuming and laborious work.

[0060] Through research by the inventor, it is found that since the existing test method relies on manual measurement of the position change amount of the cut-off line between light and dark, that is, h3 min , h60 min , this measurement method requires the operator to repeatedly measure the position change of the cut-off line between light and dark, resulting in waste of working hours. In addition, since this measurement relies on the operator to visually read the value, visual deviation is likely to occur, resulting in low measurement accuracy. Moreover, the measured value needs to be calculated to know the angle change amount at 3 minutes and 60 minutes, and human calculation errors are likely to occur during this calculation process, resulting in inaccurate final measurement data obtained.

[0061] The present invention provides a method for detecting the heat-induced sag of the cut-off line of a headlamp, aiming to solve the technical problem of the time-consuming and laborious test method for the change in the vertical position of the cut-off line of the existing low beam lamp.

[0062] Please refer to Figures 1 to 3 , in an embodiment of the present invention, the method for detecting the heat-induced sag of the cut-off line of the headlamp is implemented based on the headlamp test fixture 100. The headlamp test fixture 100 includes a base 1, an adjustment mechanism 8, a fixing frame 2, a bracket 3, an angle measuring instrument 4, a transparent sealing cover 5, a screen 9, and an illuminance meter 10. The headlamp test fixture 100 further includes a screen 9 and an illuminance meter 10 disposed on the screen 9, and the illuminance meter 10 is disposed toward the light-emitting side of the light module 200; the fixing frame 2 is disposed on the top of the base 1; the bracket 3 is used to connect with the light module 200, and the bracket 3 is detachably connected to the fixing frame 2; the angle measuring instrument 4 is disposed on the base 1 and is used to measure the angle between the base 1 and the horizontal plane; the transparent sealing cover 5 covers the base 1, and the transparent sealing cover 5 and the base 1 enclose a sealed cavity 51.

[0063] Please refer to Figure 2, the bracket 3 is disposed around the periphery of the lighting module 200. The fixing bracket 2 includes a first upright post 21, a second upright post 22, and a fixing plate 23. The first upright post 21 and the second upright post 22 are spaced apart. Two ends of the fixing plate 23 are respectively connected to the first upright post 21 and the second upright post 22. The fixing plate 23 is provided with an avoidance hole 231 for avoiding the lighting module 200, and the bracket 3 is detachably connected to the fixing plate 23. By providing the avoidance hole 231 for avoiding the lighting module 200 on the fixing plate 23, the light-emitting side of the lighting module 200 can pass through smoothly. Compared with fixing the lighting module 200 on one side of the fixing plate 23, the design of allowing the lighting module 200 to pass through the avoidance hole 231 occupies less space.

[0064] Please refer to Figure 1 and Figure 2 , the bracket 3 is provided with a threaded fastener 31. The fixing plate 23 is provided with a positioning hole 232 for the threaded fastener 31 to pass through. After the threaded fastener 31 passes through the positioning hole 232, it can be threadedly connected to a nut 32. The threaded fastener 31 can be a bolt or a ball head screw, which is not limited herein. By passing the threaded fastener 31 through the positioning hole 232 and then threadedly connecting it to the nut 32, the detachable connection between the bracket 3 and the fixing plate 23 is realized, which is convenient for replacing the lighting module 200. That is, after a lighting module 200 is tested, the lighting module 200 together with the bracket 3 is disassembled, and another lighting module 200 and the bracket 3 connected thereto are replaced for testing. The spiral cooperation of the threaded fastener 31 and the nut 32 is convenient for replacement and disassembly. The number of the threaded fasteners 31 is multiple, and the number of the positioning holes 232 is the same as that of the threaded fasteners 31 and they are arranged in one-to-one correspondence. By providing multiple threaded fasteners 31, a positioning hole 232 is provided on the fixing plate 23 corresponding to each threaded fastener 31, and each threaded fastener 31 is correspondingly provided with a nut 32, thereby effectively improving the connection strength and reliability between the bracket 3 and the fixing plate 23.

[0065] Please refer to Figure 1 and Figure 2 , the headlight test fixture 100 further includes a first level gauge 61 and a second level gauge 62. The first level gauge 61 and the second level gauge 62 are both disposed on the base 1. The first level gauge 61 extends along a first direction, and the second level gauge 62 extends along a second direction. The first direction and the second direction are perpendicularly arranged. By providing the first level gauge and the second level gauge to observe whether the adjusting mechanism 8 adjusts the base 1 to a horizontal state, so as to facilitate the subsequent test of the lighting module 200, and at the same time ensure the accuracy of the test data. The first direction is the x-axis direction, and the second direction is the y-axis direction.

[0066] Please refer to Figure 3, the headlight test fixture 100 further includes a heating module 7 disposed within the sealed cavity 51 for adjusting the temperature of the sealed cavity 51. By adding the heating module 7, the testing process can be accelerated, enabling quick acquisition of test results similar to standard tests.

[0067] Based on the above device, the detection of the heat-induced sag of the headlight cut-off line is realized.

[0068] To make the technical solution of this application clearer and easier to understand, the following introduces the method for detecting the heat-induced sag of the headlight cut-off line provided in the embodiments of this application with reference to the accompanying drawings. Please refer to Figure 8 , Figure 8 is a schematic flowchart of the first embodiment of the method for detecting the heat-induced sag of the headlight cut-off line provided by the present invention. The method for detecting the heat-induced sag of the headlight cut-off line includes the following steps:

[0069] S100, connect the bracket to the fixing frame, and control the adjusting mechanism to drive the lighting module to move to the measurement position;

[0070] It can be achieved by setting screws on the bracket and positioning holes on the fixing frame, and then threading the screws through the positioning holes and connecting them with nuts to realize the connection between the bracket and the fixing frame; it can also be that the bracket is snap-fitted with the card slot on the fixing frame to realize the connection between the bracket and the fixing frame; the adjusting mechanism can drive the lighting module to move and rotate in space, that is, the adjusting mechanism can drive the base to move along the x-axis, y-axis, and z-axis, and can also drive the base to rotate along the x-axis, y-axis, and z-axis, so that the lighting module can quickly reach the measurement position, facilitating the subsequent measurement. Among them, the adjusting mechanism can be a three-axis displacement platform or a manipulator.

[0071] S200, turn on the lighting module and start timing to obtain the lighting time;

[0072] Turn on the lighting module so that the light emitted by the lighting module exits to the screen, and at the same time record the lighting time of the lighting module for subsequent recording of the values of the angle measuring instrument within a specified time.

[0073] S300, move the illuminometer until the illuminance value of the illuminometer is the preset illuminance value;

[0074] By moving the illuminometer, the illuminance value of the lighting module covering the illuminometer will also change. To control the variables of the test and ensure the accuracy of the test, it is necessary to move the illuminometer to the position of the preset illuminance value.

[0075] S400, zero the angle measuring instrument, and cover the transparent sealing cover on the base;

[0076] Zero the angle measuring instrument to facilitate subsequent reading of the angle change of the base at 3 minutes more conveniently; cover the transparent sealing cover on the base, so as to simulate the measurement environment of the lighting module 200 arranged in the lamp housing.

[0077] S500, determine whether the lighting time reaches 3 minutes;

[0078] According to the regulatory requirements, it is necessary to record the offset of the light and dark cut-off line at 3 minutes of lighting time. Therefore, it is necessary to determine whether the time reaches 3 minutes.

[0079] S510, if the lighting time reaches 3 minutes, control the adjusting mechanism to adjust the position of the lighting module until the illuminance value of the illuminometer is the preset illuminance value, and obtain the first measurement value of the angle measuring instrument;

[0080] If the lighting time reaches three minutes, since the bracket will deform under the influence of the heat generated by the lighting module, the light emitted from the lighting module to the illuminometer will shift upward or downward. After the shift, the value of the illuminometer will also change. If the light shifts upward, it is necessary to control the adjusting mechanism to drive the base to tilt downward. The downward tilt of the base will cause a change in the angle between the base and the horizontal plane, and its specific change amount can be directly seen through the angle measuring instrument; due to the downward tilt of the base, the light emitted from the lighting module covering the screen will move downward as a whole until the illuminance value on the illuminometer returns to the preset illuminance value. At this time, the angle change of the base is the angle change amount of the light and dark cut-off line of the lighting module caused by the deformation of the bracket. Since the reading of this value does not rely on the operator to visually read the value on the ruler, it avoids the generation of visual errors and provides a guarantee for the accuracy of the measurement result. At this time, the value displayed by the angle measuring instrument is the first measurement value. In addition, if the lighting time does not reach 3 minutes, repeat the steps of S500.

[0081] S600, determine whether the lighting time reaches the preset time;

[0082] According to the regulatory requirements, the preset time is 60 minutes, that is, it is necessary to obtain the angle change amount of the light and dark cut-off line again at 60 minutes; according to the regulatory requirements, read the value again after reaching 60 minutes, so as to obtain experimental data that meets the regulatory requirements.

[0083] S610, if the lighting time reaches the preset time, control the adjusting mechanism to adjust the position of the lighting module until the illuminance value of the illuminometer is the preset illuminance value, and obtain the second measurement value of the angle measuring instrument;

[0084] If the lighting time of the lighting module reaches the preset time, it is determined whether to drive the base to tilt downward or upward by the adjustment mechanism according to whether the cut-off line of light and shade shifts upward or downward. If the cut-off line of light and shade shifts upward, it is necessary to control the adjustment mechanism to drive the base to tilt downward. The downward tilt of the base will cause a change in the angle between the base and the horizontal plane, and the specific change amount can be directly seen through an angle measuring instrument. Since the base tilts downward, the light rays projected by the lighting module onto the screen will move downward as a whole until the illuminance value on the illuminometer returns to the preset illuminance value. At this time, the angle change of the base is the angle change amount of the cut-off line of light and shade of the lighting module caused by the deformation of the bracket. Since the reading of this value does not rely on the operator to visually read the value on the ruler, the generation of visual errors is avoided, which provides a guarantee for the accuracy of the measurement result. At this time, the value displayed by the angle measuring instrument is the second measurement value. Among them, the angle measuring instrument can adopt an electronic digital display angle measuring instrument, which is convenient for the operator to read the data. In addition, if the lighting time does not reach the preset time, the steps of S600 are repeated.

[0085] S700. Obtain a test difference according to the first measurement value and the second measurement value.

[0086] The test difference can be obtained by subtracting the second measurement value from the first measurement value and then taking the absolute value of the result, or by subtracting the first measurement value from the second measurement value and then taking the absolute value of the result. This measurement difference is Δα.

[0087] Please refer to Figures 5 to 7, the technical solution of the present invention is to set a base, and a fixing frame for connecting with the bracket is set on the base, and the bracket is connected with the lighting module. After the lighting module is lit and generates heat, the angle change of the light and dark cut-off line of the lighting module caused by the deformation of the bracket can be directly obtained by the angle measuring instrument. The angle measuring instrument itself cannot directly measure the angle change of the light, because the installation of the angle measuring instrument needs to rely on the entity structure itself, while the light does not have an entity structure. In this embodiment, the angle measuring instrument is set on the base, and the illuminometer is relied on to make the light of a specified illuminance shine on the illuminometer. When the lighting module starts to light, move the position of the illuminometer up and down to make the illuminometer stay at the position of the preset illuminance value. Taking the preset illuminance value of 5 lux as an example, at this time, the light with an illuminance of 5 lux shines on the illuminometer; after the lighting module works for 3 minutes, the bracket is deformed due to the heat emitted by the lighting module, resulting in the overall deviation of the light emitted by the lighting module, that is, an included angle is formed between the light emitted by the lighting module at 3 minutes and the light emitted when the lighting module is just lit. The overall deviation of the light emitted by the lighting module may be upward or downward. Taking the upward deviation as an example, the light with an illuminance of 5 lux was originally shining on the illuminometer, but due to the influence of the bracket deformation, the light with an illuminance of 5 lux deviates upward. Since all the lights deviate synchronously, this deviation amount can be regarded as the deviation amount of the light and dark cut-off line; due to the influence of the bracket deformation, an included angle is generated between the light with an illuminance of 5 lux originally and the light with an illuminance of 5 lux after 3 minutes. Denote this included angle as α1, and this included angle is the position change amount of the light and dark cut-off line; in this application, the adjusting mechanism drives the base to move, thereby driving the light emitted by the lighting module to move downward until the light with an illuminance of 5 lux shines on the illuminometer again. Since the lighting module is set on the base, the angle at which the base rotates relative to the horizontal plane driven by the adjusting mechanism is equal to α1. The angle measuring instrument is set on the base. Since the angle measuring instrument has been zeroed before the lighting time reaches 3 minutes, the value displayed by the angle measuring instrument at 3 minutes is α1, and α1 is the first measurement value; similarly, at 60 minutes, rely on the adjusting mechanism to adjust the position of the base to make the light with an illuminance of 5 lux shine on the illuminometer again. At this time, the value on the angle measuring instrument is α2, and α2 is the second measurement value. By obtaining the difference between these two angle values, Δα can be obtained, avoiding the measurement error that is likely to occur in manual measurement, thereby improving the measurement accuracy, reducing the number of measurements, and saving the measurement time and manpower.

[0088] The inventors also found through research that since the lighting module is generally a standard part, when the low beam is in the design stage, the lamp housing and the lamp cover have not been molded yet. Since the existing tests are carried out on the whole lamp, the test data will also be affected by the lamp housing and the lamp cover. As a result, when using the existing lamp housing and lamp cover, even if the drooping angle of the cut-off line of the low beam is made to meet the regulatory requirements by modifying the bracket, due to the influence of the lamp housing and the lamp cover on the measurement results, the strength of the modified bracket may still not meet the requirements. After the lamp housing and the lamp cover are molded, if their shapes change, it will lead to a deviation between the measurement results after the lamp housing and the lamp cover are molded and then the whole lamp is tested and the previous measurement results. If the drooping angle of the cut-off line of the low beam does not meet the regulatory requirements when measured with the molded lamp housing and lamp cover, it will cause the influence of the bracket to be unable to be corrected in time and quickly before the lamp housing and the lamp cover are molded, and the bracket needs to be modified again, thus increasing the number of modifications and the modification cost, and consuming time and effort.

[0089] The technical solution of the present invention directly connects the bracket with the fixing frame to fix the lighting module connected to the bracket. Relying on the transparent sealing cover covering the base and forming a closed cavity for accommodating the lighting module with the base, it is possible to simulate the measurement environment of the lighting module arranged in the lamp housing. Since the lamp housing and the lamp cover are omitted, it is possible to separately determine the influence of the bracket on the measurement of the lighting module, eliminate the influence of the lamp housing and the lamp cover on the measurement, and thus the bracket can be modified more accurately according to the measurement data, ensuring the strength of the bracket in advance and reducing the number of modifications and the modification cost of the bracket.

[0090] In one embodiment, the step of controlling the adjusting mechanism to drive the lighting module to move to the measurement position includes:

[0091] Controlling the adjusting mechanism to drive the base to move until the top surface of the base is horizontal.

[0092] Driving the base to move through the adjusting mechanism to make the top surface of the base horizontal, so as to avoid the influence of the uneven external environment on the test.

[0093] In one embodiment, a center point is set on the screen; after the step of controlling the adjusting mechanism to drive the base to move until the top surface of the base is horizontal, it includes:

[0094] Controlling the adjusting mechanism to drive the base to move until the inflection point of the cut-off line of the lighting module moves to the center point;

[0095] Controlling the adjusting mechanism to drive the base to rotate around the vertical direction until the distance from the inflection point of the cut-off line of the lighting module to the center point is a preset distance.

[0096] Please refer toFigure 4 After the midpoint of the light and dark cut-off line moves to the center point, the adjusting mechanism drives the base to rotate around the z-axis, that is, rotate around the vertical direction, so that the inflection point of the light and dark cut-off line moves a preset distance to the right or left compared with the center point, thereby avoiding the interference of light with the same illuminance at too many different positions in the center of the lighting module. It should be noted that after the inflection point of the light and dark cut-off line moves a preset distance to the right or left compared with the center point, it is in the measurement position. The preset distance is L, and L can be 600 mm.

[0097] In one embodiment, the headlight test fixture further includes a first level gauge and a second level gauge. Both the first level gauge and the second level gauge are arranged on the top surface of the base. The first level gauge extends along a first direction, and the second level gauge extends along a second direction. The first direction and the second direction are perpendicularly arranged; the step of controlling the adjusting mechanism to drive the base to move until the top surface of the base is horizontal includes:

[0098] Controlling the adjusting mechanism to drive the base to rotate around the second direction until the first level gauge shows horizontal;

[0099] Controlling the adjusting mechanism to drive the base to rotate around the first direction until the second level gauge shows horizontal.

[0100] Controlling the adjusting mechanism to drive the base to rotate around the y-axis, so that the air in the first level gauge extending along the x-axis is in the middle position; controlling the adjusting mechanism to drive the base to rotate around the x-axis, so that the air in the second level gauge extending along the y-axis is in the middle position.

[0101] Please refer to Figure 9 , Figure 9 which is a schematic flowchart of the second embodiment of the method for detecting the thermal sag of the light and dark cut-off line of the headlight provided by the present invention; in one embodiment, the steps of S510 include:

[0102] S511, if the lighting time reaches 3 minutes, then controlling the adjusting mechanism to adjust the position of the lighting module until the illuminance value of the illuminometer is the preset illuminance value;

[0103] S512, zeroing the angle measuring instrument and obtaining the first measurement value of the angle measuring instrument.

[0104] At the 3 - minute mark, the position of the base's upward or downward tilt is adjusted through the adjustment mechanism, so that the illuminometer displays the preset illuminance value. At this time, the angle measuring instrument is set to zero, which is equivalent to the first measurement value being 0. When the second measurement value is obtained, since the first measurement value is 0, the second measurement value itself is the measurement difference, saving the work of calculating the difference between the first measurement value and the second measurement value, avoiding the phenomenon of inaccurate measurement data caused by calculation errors, improving the measurement accuracy, reducing the number of measurements, and saving measurement time and manpower.

[0105] Please refer to Figure 10 , Figure 10 is a schematic flowchart of the third embodiment of the method for detecting the heat - induced sag of the cut - off line of the headlight provided by the present invention; in an embodiment, the headlight test fixture further includes a heating module, and the headlight test fixture further includes a heating module group, and the heating module group is arranged in the sealed cavity for adjusting the temperature of the sealed cavity; after the step of S510 and before the step of S600, it includes:

[0106] S520, turn on the heating module group.

[0107] By adding a heating module 7 to accelerate the testing process, test results similar to the standard tests required by regulations can be obtained quickly. For example, given the input power and luminous efficiency of the lighting module 200, the heating power of the lighting module 200 can be calculated. Also, given that the test time of the lighting module 200 is 60 minutes, the total heat generated by the lighting module 200 within these 60 minutes can be calculated as Q1. In practical applications, since traditional testing requires waiting for 57 minutes after recording the angle at 3 minutes to obtain the second measurement value, the total heat generated by the lighting module 200 within these 57 minutes can be calculated as Q2 based on the heating power of the lighting module 200 and the waiting time of 57 minutes. If the waiting time needs to be compressed to 20 minutes, i.e., the preset time is 20 minutes, the heat generated by the lighting module 200 during the reduced heating time of 57 - 20 = 37 minutes is denoted as Q3. In this embodiment, the heating module 7 can generate heat not less than Q3 within 20 minutes, thereby simulating the temperature inside the sealed cavity 51 after the lighting module 200 has been operating for 60 minutes. Subsequently, it is only necessary to wait for another 20 minutes to obtain a numerical result that is very close to the standard measurement, greatly shortening the test time and improving the test efficiency. Since the heat generated by the heating module 7 is not less than Q3, the environmental temperature simulated by the heating module 7 is more severe. If the strength of the bracket 3 can pass the test under this environment, then when using this bracket 3 for a formal test, it can basically pass as well, meeting the test requirements. Therefore, by adding a heating module 7, test results similar to formal tests can be obtained in a shorter time, greatly improving the test efficiency, saving test time, and reducing labor costs.

[0108] Please refer to Figure 11 , Figure 11 which is a schematic flowchart of the fourth embodiment of the method for detecting the sag of the cut-off line of the headlight due to heat provided by the present invention; in one embodiment, the steps of S520 include:

[0109] S521, obtaining the heating power of the heating module;

[0110] S522, adjusting the heating module to the heating power and turning on the heating module.

[0111] It is known that the heat generation of the lighting module 200 in the period from 3 minutes to 60 minutes is Q2. If the preset time is 20 minutes and the heat generation power of the lighting module 200 is known, then the heat generation amount during the heat generation time of the lighting module working for 57 - 20 = 37 minutes can be calculated. Denote the heat generation amount of the lighting module 200 in these 37 minutes as Q3. This part of the heat Q3 needs to be generated by the heating module in 20 minutes. Given the heat Q3 and the heating time of 20 minutes, the heating power of the heating module can be calculated. In practical applications, the heating power can be slightly increased to make the test environment more stringent. If the bracket can still meet the test requirements in this stringent environment, then the bracket can basically also meet the strength requirements in the tests required by the regulations, thus providing guarantee for the reliability of the measurement results, reducing the waiting time for each measurement, and reducing the labor consumption.

[0112] In one embodiment, after the step S800, it includes:

[0113] S900, determining whether the test difference is qualified;

[0114] S910, if the test difference is unqualified, then perform die repair on the mold of the bracket.

[0115] Compare the test difference with 2 mrad to determine whether Δα is less than or equal to 2 mrad. If so, it means the test is qualified, and then this test is completed; if Δα is greater than 2 mrad, it means the test is unqualified, and then the mold of the bracket needs to be repaired. After the die repair is completed, the produced bracket needs to be tested again.

[0116] The present invention also proposes an electronic device 300, and the electronic device 300 includes: a memory, a processor, and a computer program stored on the memory and executable on the processor. The computer program is configured to implement the steps of the headlight cut-off line heat sag detection method in the above embodiments.

[0117] It shows a schematic structural diagram of the electronic device 300 suitable for implementing the embodiments of the present application. The electronic device 300 in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions: tablet computers), PMPs (Portable Media Players), in-vehicle terminals (such as in-vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 12The illustrated electronic device 300 is merely an example and should not impose any limitations on the functions and usage scope of the embodiments of the present application.

[0118] The electronic device 300 may include a processing device 301 (such as a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) or a program loaded from a storage device 308 into a random access memory (RAM: Random Access Memory). In the RAM, various programs and data required for the operation of the electronic device 300 are also stored. The processing device 301, the ROM, and the RAM are connected to each other through a bus 304. An input / output (I / O) interface is also connected to the bus 304. Generally, the following systems can be connected to the I / O interface: an input device 306 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 307 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 308 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 309. The communication device 309 can allow the electronic device 300 to communicate with other devices wirelessly or wiredly to exchange data. Although the figure shows an electronic device 300 having various systems, it should be understood that it is not required to implement or have all the shown systems. More or fewer systems can be alternatively implemented or had.

[0119] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for executing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from the network through the communication device 309, or installed from the storage device 308, or installed from the ROM. When the computer program is executed by the processing device 301, the above-mentioned functions defined in the methods of the embodiments disclosed in the present application are executed.

[0120] The electronic device 300 provided in the present application adopts the method for detecting the heat-induced sag of the cut-off line of the low beam headlight in the above-mentioned embodiment, and can solve the technical problem that the existing test method for the change of the vertical position of the cut-off line of the low beam headlight is time-consuming and laborious. Compared with the prior art, the beneficial effects of the electronic device 300 provided in the present application are the same as those of the method for detecting the heat-induced sag of the cut-off line of the low beam headlight provided in the above-mentioned embodiment, and other technical features in the electronic device 300 are the same as those disclosed in the method of the previous embodiment, and will not be elaborated here.

[0121] It should be understood that each part disclosed in this application can be implemented by hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0122] As described above, the above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0123] The present invention also provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned method for detecting the heat-induced sag of the cut-off line of the headlight are implemented.

[0124] The computer-readable storage medium provided in this application can be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM) or flash memory, optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system or device. The program code contained on the computer-readable storage medium can be transmitted by any appropriate medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0125] The above computer-readable storage medium can be included in the electronic device 300; or it can exist separately without being assembled into the electronic device 300.

[0126] Computer program code for performing the operations of this application can be written in one or more programming languages or combinations thereof. The above-mentioned programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (for example, by connecting through the Internet using an Internet service provider).

[0127] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of the code, and this module, program segment, or part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks shown can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0128] The modules described in the embodiments of this application can be implemented in software or in hardware. Among them, the name of the module does not constitute a limitation to the unit itself in some cases.

[0129] The readable storage medium provided by this application is a computer-readable storage medium. The computer-readable storage medium stores computer-readable program instructions (i.e., computer programs) for performing the above-mentioned method for detecting the heat-induced sag of the cut-off line of the headlight, and can solve the technical problem that the existing test method for the vertical position change of the cut-off line of the low beam headlight is time-consuming and laborious. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by this application are the same as those of the method for detecting the heat-induced sag of the cut-off line of the headlight provided by the above embodiments, and will not be elaborated here.

[0130] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for detecting heat droop of a headlight cut-off line, characterized in that: Based on the implementation of the headlight test fixture, the headlight test fixture includes a base, an adjustment mechanism, a fixing frame, a bracket, an angle measuring instrument, a transparent sealing cover, a screen and an illuminance meter. The headlight test fixture also includes a screen and an illuminance meter arranged on the screen, and the illuminance meter is arranged toward the light-emitting side of the light module; the fixing frame is arranged on the top of the base; the bracket is used to connect with the light module, and the bracket is detachably connected to the fixing frame; the angle measuring instrument is arranged on the base, and is used to measure the angle between the base and the horizontal plane; the transparent sealing cover is arranged on the base, and the transparent sealing cover and the base form a closed cavity; the headlight cut-off line heat droop detection method includes the following steps: Connect the bracket to the fixing bracket, and control the adjusting mechanism to drive the lighting module to move to the measuring position; Lighting up the lighting module and starting timing to obtain the lighting time; Moving the illuminance meter until the illuminance value of the illuminance meter reaches a preset illuminance value; Setting the angle measuring instrument to zero, and placing the transparent sealing cover on the base; Determine whether the lighting time reaches 3 minutes; If the lighting time reaches 3 minutes, the adjusting mechanism is controlled to adjust the position of the light module until the illuminance value of the illuminance meter reaches the preset illuminance value, and the first measurement value of the angle measuring instrument is obtained; Determining whether the lighting time reaches a preset time; If the lighting time reaches the preset time, the adjusting mechanism is controlled to adjust the position of the lighting module until the illuminance value of the illuminance meter reaches the preset illuminance value, and a second measurement value of the angle measuring instrument is obtained; A test difference value is obtained according to the first measurement value and the second measurement value.

2. The method for detecting heat droop of a headlight cut-off line as claimed in claim 1, characterized in that: The step of controlling the adjustment mechanism to drive the light module to move to the measuring position includes: The adjusting mechanism is controlled to drive the base to move until the top surface of the base is horizontal.

3. The method for detecting heat droop of the headlight cut-off line as claimed in claim 2, characterized in that: The screen is provided with a center point; after the step of controlling the adjusting mechanism to drive the base to move until the top surface of the base is horizontal, the method further comprises: Controlling the adjustment mechanism to drive the base to move until the inflection point of the light-dark cutoff line of the lighting module moves to the center point; The adjusting mechanism is controlled to drive the base to rotate in a vertical direction until the distance from the inflection point of the light-dark cut-off line of the lighting module to the center point reaches a preset distance.

4. The method for detecting heat droop of the headlight cut-off line as claimed in claim 2, characterized in that: The headlight test fixture further includes a first level measuring instrument and a second level measuring instrument, both of which are arranged on the top surface of the base, the first level measuring instrument extends along a first direction, the second level measuring instrument extends along a second direction, and the first direction and the second direction are arranged vertically; the step of controlling the adjustment mechanism to drive the base to move until the top surface of the base is horizontal includes: Controlling the adjustment mechanism to drive the base to rotate around the second direction until the first level measuring instrument displays level; The adjusting mechanism is controlled to drive the base to rotate around the first direction until the second level measuring instrument displays level.

5. The method for detecting heat droop of a headlight cut-off line according to any one of claims 1 to 4, characterized in that: If the lighting time reaches 3 minutes, the adjusting mechanism is controlled to adjust the position of the lighting module until the illuminance value of the illuminance meter reaches a preset illuminance value, and the step of obtaining the first measurement value of the angle measuring instrument includes: If the lighting time reaches 3 minutes, the adjusting mechanism is controlled to adjust the position of the light module until the illumination value of the illuminance meter reaches the preset illumination value; The angle measuring instrument is reset to zero, and a first measurement value of the angle measuring instrument is obtained.

6. The method for detecting heat droop of a headlight cut-off line according to any one of claims 1 to 4, characterized in that: The headlight test fixture further includes a heating module, and the headlight test fixture further includes a heating module, and the heating module is arranged in the closed cavity and is used to adjust the temperature of the closed cavity; if the lighting time reaches 3 minutes, the adjustment mechanism is controlled to adjust the position of the light module until the illuminance value of the illuminance meter reaches the preset illuminance value, after the step of obtaining the first measurement value of the angle measuring instrument and before the step of judging whether the lighting time reaches the preset time, it includes: Turn on the heating module.

7. The method for detecting heat droop of the headlight cut-off line as claimed in claim 6, characterized in that: The step of starting the heating module comprises: Obtaining the heating power of the heating module; The heating module is adjusted to the heating power, and the heating module is turned on.

8. The method for detecting heat droop of a headlight cut-off line according to any one of claims 1 to 4, characterized in that: The step of obtaining a test difference value according to the first measurement value and the second measurement value comprises: Determining whether the test difference is qualified; If the test difference is unqualified, the mold of the bracket is repaired.

9. An electronic device, characterized in that: The electronic device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the headlight cut-off line heat droop detection method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the steps of the method for detecting the thermal droop of a headlamp cut-off line as claimed in any one of claims 1 to 8.

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