CN118190367A - Dipped headlight cut-off line position standard test method, device and medium - Google Patents
Dipped headlight cut-off line position standard test method, device and medium Download PDFInfo
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Abstract
The application discloses a method, equipment and medium for testing the light and shade cut-off line position of a near light, relating to the technical field of vehicle testing, wherein the method comprises the following steps: the method comprises the steps that a tested vehicle is driven to rotate a first preset angle relative to a display module by a testing turntable, and a data acquisition module is started to move at a first preset speed to obtain a first data set; determining a first maximum gradient inflection point position according to the first illuminance value and the first included angle; when the difference between the new first included angle and the first angle is in a first preset difference range, the data acquisition module is moved to a preset reference line, and the tested vehicle is driven to rotate in the first preset angle range by the testing turntable, so that a second data set is obtained; when the difference between the second included angle corresponding to the second maximum gradient inflection point position and the second angle exceeds a second preset difference range, adjusting the lamp equipment by using the dimming equipment, and when the new difference between the second included angle and the second angle is in the second preset difference range, completing the standard test operation; high precision and wide application range.
Description
Technical Field
The application relates to the technical field of vehicle testing, in particular to a dipped headlight cut-off line position standard test method, device and medium.
Background
In the lighting index of the automobile light, the cut-off line of the dipped headlight is a cut-off line of the dipped headlight which is projected on the road surface and visually perceived as a light and shade change significantly, plays a crucial role in the safety of driving at night, and the initial standard position of the cut-off line of the dipped headlight is one of important indexes of the dipped headlight design. An excessively high cut-off line may cause glare to a road user compared to the initial aiming position, and an excessively low cut-off line may affect the light irradiation distance, thereby affecting traffic safety. Different types of vehicles and different low beam mounting heights, and the initial cut-off line standard position has clear design requirements in the national standard. When the host computer factory detects that the vehicle is off line or the user is in the annual inspection process of the vehicle, the initial standard position of the cut-off line can be adjusted through the light adjusting device, so that the cut-off line meets the safety use requirement.
Conventional alight test methods require that the cutoff line be at an angle of 15 ° or 45 ° to the horizontal. However, the intelligent headlamps such as the emerging matrix headlamps, the pixel headlamps and the like do not prescribe the included angle any more, and if the intelligent headlamps continue to be tested according to the traditional method, deviation is easy to occur.
Disclosure of Invention
In view of the above-mentioned drawbacks or shortcomings in the prior art, it is desirable to provide a low beam cutoff position calibration test method, apparatus and medium that improves calibration accuracy and has a wide application range.
In a first aspect, the present application provides a dipped headlight cutoff line position calibration test method, implemented based on a dipped headlight cutoff line position calibration test device, the device at least comprising: the testing turntable and the display module; the test turntable is provided with a tested vehicle; when the detected vehicle is in an initial state, the running direction of the detected vehicle is perpendicular to the length direction of the display module; the vehicle to be tested is provided with a lamp device and a dimming device, wherein light emitted by the lamp device is projected on the display module, and the dimming device is used for adjusting the position of the lamp device; the display module is provided with a data acquisition module, and the data acquisition module moves along the height direction of the display module;
The method comprises the following steps:
Acquiring an initial standard position of a cut-off line of the tested vehicle;
Determining a first angle of the cutoff line along the height direction of the display module and a second angle along the length direction of the display module according to the initial collimation position;
The tested vehicle is driven to rotate a first preset angle relative to the display module by the test turntable, and the data acquisition module is started to move along the height direction of the display module at a first preset speed to obtain a first data set; the first data set comprises a plurality of first illumination values and corresponding first included angles;
Determining a first maximum gradient inflection point position according to a first illuminance value and a first included angle in the first data set;
When the difference between a first included angle corresponding to the first maximum gradient inflection point position and the first angle exceeds a first preset difference range, adjusting the relative position of the lamp equipment along the height direction of the display module by using the dimming equipment, and acquiring a new first maximum gradient inflection point position again;
When the difference between the first included angle corresponding to the new first maximum gradient inflection point position and the first angle is in a first preset difference range, a preset reference line is obtained;
the data acquisition module is moved to the preset reference line, and the tested vehicle is driven to rotate in a first preset angle range relative to the display module at a second preset speed by utilizing the test turntable, so that a second data set is obtained; the second data set comprises a plurality of second illumination values and corresponding second included angles;
Determining a second maximum gradient inflection point position according to a second illuminance value and a second included angle in the second data set;
when the difference between a second included angle corresponding to the second maximum gradient inflection point position and the second angle exceeds a second preset difference range, adjusting the relative position of the lamp equipment along the length direction of the display module by using the dimming equipment, and acquiring a new second maximum gradient inflection point position again;
And when the difference between the second included angle corresponding to the new second maximum gradient inflection point position and the second angle is in a second preset difference range, finishing the standard test operation.
According to the technical scheme provided by the application, the method for acquiring the initial standard position of the cut-off line of the tested vehicle comprises the following steps:
The center of the test turntable is taken as a first origin, an extension line which passes through the first origin and is perpendicular to the length direction of the display module and is perpendicular to the height direction of the display module is taken as an X axis, an extension line which passes through the first origin and is parallel to the length direction of the display module is taken as a Y axis, and an extension line which passes through the first origin and is parallel to the height direction of the display module is taken as a Z axis, so that a three-dimensional coordinate system is constructed;
Acquiring an optical center coordinate of the lamp equipment in the three-dimensional coordinate system;
acquiring initial downward inclination of the lamp equipment;
And determining the initial collimation position of the cut-off line according to the initial downward inclination and the optical center coordinates.
According to the technical scheme provided by the application, the preset datum line is determined according to the following steps:
The center of the display module is taken as a second origin, an extension line which passes through the second origin and is parallel to the height direction of the display module is taken as a V axis, and an extension line which passes through the second origin and is parallel to the length direction of the display module is taken as an H axis, so that a first datum line group is constructed;
Calculating the vertical angle between the preset datum line and the H axis;
And determining the preset reference line according to the vertical angle.
According to the technical scheme provided by the application, the vertical angles of the preset datum line and the H axis are calculated according to the following formula:
；
wherein D is the vertical angle of the preset datum line and the H axis, and c is the initial downward inclination.
According to the technical scheme provided by the application, the first angle is calculated according to the following formula:
；
Wherein, At a first angle, c is the initial downward inclination.
According to the technical scheme provided by the application, the second angle is calculated according to the following formula:
；
Wherein, And a is the included angle between the cut-off line and the H axis, D is the vertical angle between the preset datum line and the H axis, and c is the initial downward inclination.
According to the technical scheme provided by the application, the position of the first maximum gradient inflection point is determined according to the following steps:
According to each first illumination value and a corresponding first included angle in the first data set, calculating a logarithmic difference to obtain a logarithmic difference set; the set of log differences includes a plurality of log differences;
and determining the position of the first maximum gradient inflection point according to the maximum logarithmic difference in the logarithmic difference set.
According to the technical scheme provided by the application, the logarithmic difference is calculated according to the following formula:
；
wherein M is logarithmic difference, E is the first illumination value; beta is the first included angle.
In a second aspect, the present application provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the low beam cut-off line position calibration test method as described above when executing the computer program.
In a third aspect, the present application provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the low beam cutoff position calibration test method as described above.
According to the technical scheme, the application has at least the following beneficial effects:
The application provides a dipped headlight cut-off line position standard test method, which comprises the steps of obtaining an initial standard position of a cut-off line of a tested vehicle; determining a first angle of the cutoff line along the height direction of the display module and a second angle of the cutoff line along the length direction of the display module according to the initial alignment position; the method comprises the steps that a tested vehicle is driven to rotate a first preset angle relative to a display module by a testing turntable, then a data acquisition module is started to move along the height direction of the display module at a first preset speed, and a first data set is obtained, wherein the first data set comprises a plurality of first illuminance values and corresponding first included angles; determining a first maximum gradient inflection point position according to a first illuminance value and a first included angle in a first data set; judging whether the difference value between the first included angle and the first angle corresponding to the position of the first maximum gradient inflection point is within a first preset difference value range, when the difference value between the first included angle and the first angle exceeds the first preset difference value range, adjusting the relative position of the lamp equipment along the height direction of the display module by using dimming equipment, and acquiring a new position of the first maximum gradient inflection point again for re-judging; when the difference between the first included angle corresponding to the new first maximum gradient inflection point position and the first angle is in a first preset difference range, acquiring a preset reference line; then the data acquisition module is moved to a preset reference line, and the tested vehicle is driven to rotate in a first preset angle range relative to the display module at a second preset speed by utilizing the test turntable, so that a second data set is obtained, wherein the second data set comprises a plurality of second illuminance values and corresponding second included angles; judging whether the difference value between the second included angle and the second angle corresponding to the second maximum gradient inflection point position is within a second preset difference value range, when the difference value between the second included angle and the second angle exceeds the second preset difference value range, adjusting the relative position of the lamp equipment along the length direction of the display module by using the dimming equipment, and acquiring a new second maximum gradient inflection point position again; and then judging that the difference between the second included angle corresponding to the new second maximum gradient inflection point position and the second angle is in a second preset difference range, and completing the standard test operation.
The method keeps the cut-off line within a reasonable deviation range through the steps, and reduces hidden trouble of traffic lighting installation caused by the deviation of the cut-off line. Compared with the traditional standard test method, the angle between the cut-off line and the horizontal line is required to be 15 degrees or 45 degrees, the test process and the test effect of the application are not affected by the angle between the cut-off line and the horizontal line, the cut-off lines at different angles can be positioned more accurately, the standard precision is prevented from being affected by angle errors, and the application range is wider.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings.
Fig. 1 is a schematic diagram of a device for calibrating the cut-off line position of a dipped headlight.
Fig. 2 is a flow chart of a dipped headlight cut-off line position calibration test method.
Fig. 3 is a flow chart of the process of acquiring an initial alignment position.
Fig. 4 is an exemplary diagram of adjustment of the cutoff line.
Fig. 5 is a schematic structural diagram of an electronic device.
Reference numerals in the drawings: 1. testing a rotary table; 2. a vehicle to be tested; 3. a display module; 4. a data acquisition module; 5. a shielding baffle;
500. an electronic device; 501. a CPU; 502. a ROM; 503. a RAM; 504. a bus; 505. an I/O interface; 506. an input section; 507. an output section; 508. a storage section; 509. a communication section; 510. a driver; 511. removable media.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Different types of vehicles and different low beam mounting heights, and the initial alignment position of the cut-off line has clear design requirements in the national standard. Because there are errors and relevant problem influences such as whole car size chain when lamps and lanterns are actually installed, the lamps and lanterns module that the vehicle was installed at the production line can deviate from former design position, lead to the light and shade line position to deviate from the design position, so the host computer factory can adjust the light and shade line of lamps and lanterns, make its position fall in the error allowance scope, but when the vehicle arrives in the user's hand, because the influence such as human factor, mechanical debugging factor, actual environment factor also can let the light and shade line deviate from, consequently, the position of light and shade line need constantly take care of the test, traditional care test method is limited to the angle that light and shade line formed, but most headlamps that use at present are not at prescribed contained angle, if use traditional mode test, the deviation appears easily, there is traffic safety hidden danger.
The overall dimensional chain generally refers to a closed dimensional system arranged in a certain order, which determines the dimensions of the mutual positions of the geometric elements (points, lines, faces), generally linked to each other, during the machining of the vehicle parts or the assembly of the machine.
In view of the above, the present application provides a dipped headlight cutoff line position calibration test method, which includes: based on the initial standard position of the cut-off line of the lamp equipment, a first angle of the cut-off line along the height direction of the display module and a second angle along the length direction of the display module are obtained, the first angle is used as a judging standard of the cut-off line along the height direction of the display module, the second angle is used as a judging standard of the cut-off line along the length direction of the display module, then a test along the height direction of the display module is carried out, a tested vehicle rotates relative to the display module by a first preset angle, then the data acquisition module moves along the height direction of the display module at a first preset rate, a first data set is obtained, whether the current position of the cut-off line along the height direction of the display module meets the requirements is judged based on the first data set and the first angle, when the requirements are met, then the test along the length direction of the display module is carried out, the data acquisition module is moved onto the preset standard line, the tested vehicle rotates within a first preset angle range relative to the display module at a second preset rate, a second data set is obtained, and then whether the current cut-off line meets the length direction of the display module meets the requirements is judged based on the second data set and the second angle, and when the current cut-off line meets the requirements are met, the standard operation is completed.
In order to make the technical solution of the present application clearer and easier to understand, the following describes a device for calibrating and testing the position of the cut-off line of a dipped headlight according to an embodiment of the present application, as shown in fig. 1, the device is a schematic structural diagram of the device for calibrating and testing the position of the cut-off line of the dipped headlight according to the embodiment of the present application, and the device includes:
The testing turntable 1 and the display module 3 are arranged in a testing environment through a rotating shaft, the rotating shaft is positioned at the center of the testing turntable 1, the testing turntable 1 is connected with a driving shaft of a driving mechanism, and the driving mechanism is used for driving the testing turntable 1 to rotate around the rotating shaft; here, the driving mechanism is, for example, a driving motor. The tested vehicle 2 is arranged on the testing turntable 1, the tested vehicle 2 is provided with a lamp device and a dimming device, light emitted by the lamp device can be projected on the display module 3, the dimming device is used for adjusting the position of the lamp device, the dimming device is a bolt hole position, and the automobile engine cover can be found by opening the automobile engine cover. In addition, when the vehicle 2 under test is in an initial state, i.e., before the test is performed, the head of the vehicle 2 under test faces the display module 3, and the traveling direction of the vehicle 2 under test is perpendicular to the longitudinal direction of the display module 3.
Further, the display module 3 is, for example, an optical display screen. The display module 3 is provided with a data acquisition module 4, and the data acquisition module 4 can move along the height direction of the display module 3; the data acquisition module 4 can be installed on the linear shaft of the display module 3, the axis of the linear shaft and the height direction of the display module are arranged in parallel, the data acquisition module 4 is installed on the linear shaft, and the data acquisition module 4 is further connected with a driving shaft of a driving cylinder and used for driving the data acquisition module 4 to move along the axis of the linear shaft. Here, the data acquisition module 4 is, for example, a linear illuminometer, and is configured to acquire relevant data of the luminaire device. Wherein the linear distance between the test turntable 1 and the display module 3 is for example 10 meters or 25 meters. A shielding baffle plate 5 is further arranged between the test turntable 1 and the display module 3, and the shielding baffle plate 5 is used for shielding stray light, so that a clear cut-off line can be displayed on the display module 3; and the number of shielding baffles 5 may be set according to actual needs. An imaging type brightness meter is also arranged on the shielding baffle plate 5 relatively close to the test turntable 1 and used for measuring the brightness of light, and the measured brightness of light can be used for determining the compliance of a specified test angle and area or evaluating the overall optical performance.
The alight test is performed based on the device.
In order to make the technical solution of the present application clearer and easier to understand, the following describes a method for calibrating and testing the position of the cut-off line of a dipped headlight according to an embodiment of the present application, as shown in fig. 2, the fig. is a flowchart of the method for calibrating and testing the position of the cut-off line of the dipped headlight according to the embodiment of the present application, the method includes the following steps:
S100, acquiring an initial standard position of a cut-off line of the tested vehicle.
As shown in fig. 4, f in the drawing is a cutoff line.
Specifically, as shown in fig. 3, acquiring an initial standard position of a cutoff line of a vehicle under test includes:
S1001, taking the center of a test turntable as a first origin, taking an extension line which passes through the first origin and is perpendicular to the length direction of the display module and is perpendicular to the height direction of the display module as an X axis, taking an extension line which passes through the first origin and is parallel to the length direction of the display module as a Y axis, and taking an extension line which passes through the first origin and is parallel to the height direction of the display module as a Z axis, so as to construct a three-dimensional coordinate system.
S1002, acquiring an optical center coordinate of the lamp equipment in a three-dimensional coordinate system.
The size of the test turntable and the size of the tested vehicle are all known data, and the optical center coordinates of the lamp equipment are determined in a three-dimensional coordinate system based on the known data.
S1003, acquiring initial downward inclination of the lamp equipment.
Wherein, the downward inclination refers to the inclination degree of the lamplight emitted by the lamp device relative to the horizontal plane of the vehicle. The initial downward inclination is marked on the lamp body of the lamp device before leaving the factory, and the engine cover of the tested vehicle is opened for viewing. The initial downward inclination is, for example, 1%.
S1004, determining the initial alignment position of the cut-off line according to the initial downward inclination and the optical center coordinates.
Based on the trigonometric function principle, calculating an initial collimation position of a cut-off line according to the initial downward inclination and the optical center coordinate; the initial alignment position is located on the display module, and two marking lines which are perpendicular to each other and pass through the initial alignment position are drawn on the display module, as shown in fig. 4, A-A represents a marking line which is parallel to the height direction of the display module and passes through the initial alignment position, B-B represents a marking line which is parallel to the length direction of the display module and passes through the initial alignment position, and the intersection point position of A-A and B-B is the initial alignment position.
S101, determining a first angle of the cut-off line along the height direction of the display module and a second angle of the cut-off line along the length direction of the display module according to the initial alignment position.
As shown in fig. 4, the center of the display module is taken as a second origin, an extension line passing through the second origin and parallel to the height direction of the display module is taken as a V-axis, and an extension line passing through the second origin and parallel to the length direction of the display module is taken as an H-axis, so as to construct the first datum line group.
It should be noted that, the first angle is calculated according to the following formula:
；
Wherein, At a first angle, c is the initial downward inclination.
The second angle is calculated according to the following formula:
；
Wherein, And a is the included angle between the cut-off line and the H axis, D is the vertical angle between the preset datum line and the H axis, and c is the initial downward inclination.
In addition, the vertical angle of the preset reference line and the H axis is calculated according to the following formula:
；
wherein D is the vertical angle of the preset datum line and the H axis, and c is the initial downward inclination.
S102, driving a tested vehicle to rotate a first preset angle relative to a display module by using a test turntable, and starting a data acquisition module to move along the height direction of the display module at a first preset speed to obtain a first data set; the first data set includes a plurality of first illumination values and corresponding first angles.
Wherein the first preset angle is for example 2.5 °. The first preset rate is for example 0.01 deg./s. The first included angle is an included angle between the optical center of the lamp device before the test turntable rotates and the connecting line of the data acquisition module and the connecting line of the optical center of the lamp device after the test turntable rotates by a first preset included angle.
S103, determining a first maximum gradient inflection point position according to the first illuminance value and the first included angle in the first data set.
It should be noted that the first maximum gradient inflection point position is determined according to the following steps:
According to each first illumination value and a corresponding first included angle in the first data set, calculating a logarithmic difference to obtain a logarithmic difference set; the log difference set includes a plurality of log differences;
Here, the logarithmic difference is calculated according to the following formula:
；
wherein M is logarithmic difference, E is the first illumination value; beta is the first included angle.
And determining the position of the first maximum gradient inflection point according to the maximum logarithmic difference in the logarithmic difference set.
And S104, when the difference between the first included angle corresponding to the first maximum gradient inflection point position and the first angle exceeds a first preset difference range, adjusting the relative position of the lamp equipment along the height direction of the display module by using the dimming equipment, and acquiring a new first maximum gradient inflection point position again.
The first preset difference range is, for example, ±0.02% of the first angle.
When the difference between the first included angle corresponding to the first maximum gradient inflection point position and the first angle is within the first preset difference range, step S105 is performed. When the difference between the first included angle corresponding to the first maximum gradient inflection point position and the first angle exceeds a first preset difference range, the relative position of the lamp equipment along the height direction of the display module is adjusted by using the dimming equipment, the new standard position of the cut-off line is obtained again, a new first data set is determined according to the new standard position, the new first maximum gradient inflection point position is obtained in the new first data set, the judgment is carried out again until the difference between the first included angle corresponding to the new first maximum gradient inflection point position and the first angle is in the first preset difference range, and the position of the current cut-off line in the height direction of the display module is reasonably represented.
S105, when the difference between the first included angle corresponding to the new first maximum gradient inflection point position and the first angle is in a first preset difference range, a preset reference line is obtained.
Specifically, the preset reference line is determined according to the following steps:
Calculating the vertical angle between a preset datum line and the H axis;
The vertical angle of the preset reference line and the H axis is calculated according to the following formula:
；
wherein D is the vertical angle of the preset datum line and the H axis, and c is the initial downward inclination.
It should be noted that 0.37 of the above formula refers to a position 0.37 degrees above the theoretical cutoff line, and the position is defined as a preset reference line for horizontal gradient scan calculation.
And determining a preset datum line according to the vertical angle. Here, the preset reference line and the H axis are disposed in parallel, and as shown in fig. 4, d denotes the preset reference line.
S106, the data acquisition module is moved to a preset reference line, and the tested vehicle is driven to rotate in a first preset angle range relative to the display module at a second preset speed by utilizing the test turntable, so that a second data set is obtained; the second data set includes a plurality of second illumination values and corresponding second angles.
The data acquisition module moves to the intersection point position of the preset datum line and the linear axis. The first predetermined angular range is, for example, +2.5° to-2.5 °; setting: before testing, the extension line which passes through the center of the testing turntable and is perpendicular to the length direction of the display module and is perpendicular to the height direction of the display module is 0 degrees, and the testing turntable rotates to the left side to be positive number degrees and rotates to the right side to be negative number degrees. The second preset rate is for example 0.01 deg./s.
The second included angle is an included angle between the connecting line of the optical center of the lamp device and the data acquisition module before the test turntable rotates and the connecting line of the optical center of the lamp device and the data acquisition module in the process that the test turntable rotates within a first preset angle range.
And S107, determining a second maximum gradient inflection point position according to a second illumination value and a second included angle in the second data set.
It should be noted that, the manner of determining the second maximum gradient inflection point position is identical to the manner of determining the first maximum gradient inflection point position described above, and detailed descriptions thereof are omitted herein.
S108, when the difference between the second included angle corresponding to the second maximum gradient inflection point position and the second angle exceeds a second preset difference range, adjusting the relative position of the lamp equipment along the length direction of the display module by using the dimming equipment, and acquiring a new second maximum gradient inflection point position again.
The second preset difference range is, for example, ±0.02% of the second angle.
When the difference between the second included angle corresponding to the second maximum gradient inflection point position and the second angle is within the second preset difference range, step S109 is performed. When the difference between the second included angle corresponding to the second maximum gradient inflection point position and the second angle exceeds a second preset difference range, the dimming equipment is used for adjusting the relative position of the lamp equipment along the height direction of the display module, the new standard position of the cut-off line is obtained again, the new second data set is determined according to the new standard position, the new second maximum gradient inflection point position is obtained in the new second data set, the judgment is carried out again until the difference between the second included angle corresponding to the new second maximum gradient inflection point position and the second angle is in the second preset difference range, and the position of the current cut-off line in the length direction of the display module is reasonably represented.
And S109, completing the standard test operation when the difference between the second included angle corresponding to the new second maximum gradient inflection point position and the second angle is in a second preset difference range.
Through the steps, the cut-off line is kept in a reasonable deviation range, and the hidden trouble of traffic lighting installation caused by the deviation of the cut-off line in the standard is reduced. Compared with the traditional standard test method, the angle between the cut-off line and the horizontal line is required to be 15 degrees or 45 degrees, the test process and the test effect of the application are not affected by the angle between the cut-off line and the horizontal line, the cut-off lines at different angles can be positioned more accurately, the standard precision is prevented from being affected by angle errors, and the application range is wider.
The low beam cutoff position calibration test method in the present application will be described with reference to specific examples for the sake of easy understanding.
The right side of the cut-off line forms an angle of 30 ° with the H-H mark line, and g is a diagonal line passing through a point on the right side of the cut-off line, as shown in fig. 4, and the angle formed by the diagonal line and the H-H mark line is 30 °. The initial downtilt of the luminaire device is 0.01.
As shown in FIG. 4, first, a vertical direction standard test is performed to calculate a first angle asAnd rotating the test turntable to the left by 2.5 degrees and keeping the test turntable still, wherein the angle between the e and the V-V mark line is 2.5 degrees in fig. 4, scanning a cut-off line between the e and the V-V mark line along the vertical direction by using the data acquisition module to obtain a first data set, determining a first maximum gradient inflection point position according to a first illuminance value and a first included angle in the first data set, judging whether a difference value between the first included angle and the first angle corresponding to the first maximum gradient inflection point position is within a first preset difference value range, if so, performing a horizontal standard test, if so, adjusting the position of the lamp equipment along the height direction of the display module by using the dimming equipment, re-acquiring the first maximum gradient inflection point position until the corresponding difference value between the first included angle and the first angle is within the first preset difference value range, and performing a horizontal standard test.
Secondly, on the premise of finishing the vertical direction standard test, performing the horizontal direction standard test, and firstly acquiring the position of a preset datum line asThat is, scanning at a position 0.2 ° below the H-H reference line to obtain a second data set, determining a second maximum gradient inflection point position according to a second illuminance value and a second angle in the second data set, and determining whether a difference between the second angle and the second angle corresponding to the second maximum gradient inflection point position is within a second preset difference range, where the second angle/>; If the difference value between the second included angle and the second angle is within a second preset difference value range, adjusting the position of the lamp equipment along the length direction of the display module by using the light adjusting equipment, and then performing a horizontal direction standard test; if within the range, it indicates that the test operation is authorized.
The application provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of a low beam cut-off line position calibration test method according to the above embodiment when executing the computer program.
Therein, as shown in fig. 5, the electronic device 500 includes a CPU501, which can perform various appropriate actions and processes according to a program stored in a ROM502 or a program loaded from a storage section into a RAM 503. In the RAM503, various programs and data required for the system operation are also stored. The CPU501, ROM502, and RAM503 are connected to each other through a bus 504. I/O interface 505 is also connected to bus 504.
The following components are connected to the I/O interface 505: an input section 506 including a keyboard, a mouse, and the like; an output portion 507 including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker, and the like; a storage portion 508 including a hard disk and the like; and a communication section 509 including a network interface card such as a LAN card, a modem, or the like. The communication section 509 performs communication processing via a network such as the internet. The drives are also connected to the I/O interface 505 as needed. A removable medium 511 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 510 as needed so that a computer program read therefrom is mounted into the storage section 508 as needed.
In particular, the process described above with reference to flowchart 2 may be implemented as a computer software program according to an embodiment of the application. For example, the present application includes a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method shown in the flow chart. In such embodiments, the computer program may be downloaded and installed from a network via a communication portion, and/or installed from a removable medium. The above-described functions defined in the system of the present application are performed when the computer program is executed by the CPU 501.
The computer readable medium shown in the present application may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a RAM (random access memory), a ROM (read-only memory), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present application, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units involved in the embodiments of the present application may be implemented by software, or may be implemented by hardware, and the described units may also be provided in a processor. Wherein the names of the units do not constitute a limitation of the units themselves in some cases. The described units or modules may also be provided in a processor.
The present application also provides a computer-readable storage medium that may be included in the electronic device described in the above embodiments; or may exist alone without being incorporated into the electronic device. The computer-readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to implement a low beam cutoff position calibration test method as described in the above embodiments.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (10)
1. A dipped headlight cutoff line position calibration test method, characterized in that it is implemented based on a dipped headlight cutoff line position calibration test device, said device at least comprising: the testing turntable and the display module; the test turntable is provided with a tested vehicle; when the detected vehicle is in an initial state, the running direction of the detected vehicle is perpendicular to the length direction of the display module; the vehicle to be tested is provided with a lamp device and a dimming device, wherein light emitted by the lamp device is projected on the display module, and the dimming device is used for adjusting the position of the lamp device; the display module is provided with a data acquisition module, and the data acquisition module moves along the height direction of the display module;
The method comprises the following steps:
Acquiring an initial standard position of a cut-off line of the tested vehicle;
Determining a first angle of the cutoff line along the height direction of the display module and a second angle along the length direction of the display module according to the initial collimation position;
The tested vehicle is driven to rotate a first preset angle relative to the display module by the test turntable, and the data acquisition module is started to move along the height direction of the display module at a first preset speed to obtain a first data set; the first data set comprises a plurality of first illumination values and corresponding first included angles;
Determining a first maximum gradient inflection point position according to a first illuminance value and a first included angle in the first data set;
When the difference between a first included angle corresponding to the first maximum gradient inflection point position and the first angle exceeds a first preset difference range, adjusting the relative position of the lamp equipment along the height direction of the display module by using the dimming equipment, and acquiring a new first maximum gradient inflection point position again;
When the difference between the first included angle corresponding to the new first maximum gradient inflection point position and the first angle is in a first preset difference range, a preset reference line is obtained;
the data acquisition module is moved to the preset reference line, and the tested vehicle is driven to rotate in a first preset angle range relative to the display module at a second preset speed by utilizing the test turntable, so that a second data set is obtained; the second data set comprises a plurality of second illumination values and corresponding second included angles;
Determining a second maximum gradient inflection point position according to a second illuminance value and a second included angle in the second data set;
when the difference between a second included angle corresponding to the second maximum gradient inflection point position and the second angle exceeds a second preset difference range, adjusting the relative position of the lamp equipment along the length direction of the display module by using the dimming equipment, and acquiring a new second maximum gradient inflection point position again;
And when the difference between the second included angle corresponding to the new second maximum gradient inflection point position and the second angle is in a second preset difference range, finishing the standard test operation.
2. The method of claim 1, wherein the obtaining an initial alight position of a cutoff line of the vehicle under test comprises:
The center of the test turntable is taken as a first origin, an extension line which passes through the first origin and is perpendicular to the length direction of the display module and is perpendicular to the height direction of the display module is taken as an X axis, an extension line which passes through the first origin and is parallel to the length direction of the display module is taken as a Y axis, and an extension line which passes through the first origin and is parallel to the height direction of the display module is taken as a Z axis, so that a three-dimensional coordinate system is constructed;
Acquiring an optical center coordinate of the lamp equipment in the three-dimensional coordinate system;
acquiring initial downward inclination of the lamp equipment;
And determining the initial collimation position of the cut-off line according to the initial downward inclination and the optical center coordinates.
3. The method of claim 1, wherein the preset reference line is determined according to the steps of:
The center of the display module is taken as a second origin, an extension line which passes through the second origin and is parallel to the height direction of the display module is taken as a V axis, and an extension line which passes through the second origin and is parallel to the length direction of the display module is taken as an H axis, so that a first datum line group is constructed;
Calculating the vertical angle between the preset datum line and the H axis;
And determining the preset reference line according to the vertical angle.
4. A method according to claim 3, wherein the vertical angle of the preset reference line and the H-axis is calculated according to the following formula:
；
wherein D is the vertical angle of the preset datum line and the H axis, and c is the initial downward inclination.
5. The method of claim 1, wherein the first angle is calculated according to the following formula:
；
Wherein, At a first angle, c is the initial downward inclination.
6. The method of claim 4, wherein the second angle is calculated according to the following formula:
；
Wherein, And a is the included angle between the cut-off line and the H axis, D is the vertical angle between the preset datum line and the H axis, and c is the initial downward inclination.
7. The method of claim 1, wherein the first maximum gradient inflection point location is determined according to the steps of:
According to each first illumination value and a corresponding first included angle in the first data set, calculating a logarithmic difference to obtain a logarithmic difference set; the set of log differences includes a plurality of log differences;
and determining the position of the first maximum gradient inflection point according to the maximum logarithmic difference in the logarithmic difference set.
8. The method of claim 7, wherein the log difference is calculated according to the formula:
；
wherein M is logarithmic difference, E is the first illumination value; beta is the first included angle.
9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the dipped headlight cut-off position calibration test method according to any one of claims 1 to 8 when the computer program is executed.
10. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the low beam cutoff position calibration test method according to any one of claims 1 to 8.
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