CN111595563A - Headlamp illumination performance dynamic test method based on whole vehicle - Google Patents
Headlamp illumination performance dynamic test method based on whole vehicle Download PDFInfo
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Abstract
The invention relates to the technical field of vehicle testing, and particularly discloses a dynamic testing method for the lighting performance of a headlamp based on a whole vehicle, which comprises the following steps: s1, establishing a coordinate system of the test system; s2, collecting lane line data; s3, setting illumination data measuring points on two sides of the origin of coordinates; s4, collecting the motion data of the vehicle and collecting the data of the change of the illuminance of the headlight of the vehicle along with the time on the illuminance data measuring point; s5, calculating the transverse deviation between the vehicle and the lane line based on the motion data and the lane line coordinates, and verifying whether the transverse deviation is within a preset deviation range; s6, correcting the illumination data by using the spacing distance, the motion data and the lane line data to obtain corrected illumination data; s7, the interval distance and the corrected illuminance data are synchronized with time to obtain an illuminance data curve varying with the interval distance. By adopting the technical scheme of the invention, the accuracy of the illumination performance test can be improved.
Description
Technical Field
The invention relates to the technical field of vehicle testing, in particular to a dynamic testing method for the lighting performance of a headlamp based on a whole vehicle.
Background
At present, automobiles increasingly consider the safety of protecting passengers and pedestrians, and particularly at night or under the condition of poor light, the road condition is more difficult to know, so that the automobile is tested by a driver, and certain risks also exist for the pedestrians. The headlamp is used as the 'eye' of the automobile, the good headlamp can improve the driving safety at night, and a driver can drive more easily and comfortably at night, so that strict requirements are provided for the lighting performance of the headlamp of the automobile.
The existing national standard only restricts the illumination requirement of the headlamp from the light distribution angle, which is a technical requirement at the level of the vehicle lamp parts. After the vehicle lamp meeting the standard is installed on the whole vehicle, the deviation of the lighting effect is caused by factors such as the installation position and the dimming precision. Particularly, in the actual use process of the headlamp, the vehicle is in a moving state, and due to the influence of the road surface, weather and vehicle posture, the difference between the dynamic performance and the static illumination performance is large, so that the test requirement of the illumination performance of the real vehicle cannot be met by the regulation light distribution standard.
Therefore, a whole-vehicle-level dynamic testing method capable of improving the testing accuracy of the lighting performance is needed.
Disclosure of Invention
The invention provides a dynamic test method for the lighting performance of a headlamp based on a whole vehicle, which can improve the accuracy of the lighting performance test.
In order to solve the technical problem, the present application provides the following technical solutions:
a dynamic test method for the lighting performance of a headlamp based on a whole vehicle comprises the following steps;
s1, determining a tested lane, marking a lane line at the center of the lane, recording coordinates of the lane line, and establishing a coordinate system of the test system by taking a point which is a first preset length away from a vehicle along the lane line as an origin of coordinates;
s2, acquiring the height difference of the position of the lane line relative to the origin of coordinates and the coordinate value of the position in the coordinate system of the test system at intervals of a second preset length along the lane direction, and storing the height difference and the coordinate value as lane line data;
s3, setting illumination data measuring points on two sides of the origin of coordinates;
s4, enabling the vehicle to run along the lane line, collecting the motion data of the vehicle, and collecting the data of the change of the illuminance of the headlight of the vehicle along with the time on the illuminance data measuring point;
s5, calculating the transverse deviation between the vehicle and the lane line based on the motion data and the lane line coordinates, and verifying whether the transverse deviation is within a preset deviation range or not, wherein the test is effective within the preset deviation range; if the deviation exceeds the preset deviation range, the test is invalid, and the step of S4 is carried out again;
s6, calculating the spacing distance between the front end of the vehicle and the origin of coordinates by using the motion data to obtain data of the variation of the spacing distance along with time; correcting the illumination data by using the interval distance, the motion data and the lane line data to obtain the illumination data which changes along with time after correction;
s7, the interval distance and the corrected illuminance data are synchronized with time to obtain an illuminance data curve varying with the interval distance.
The basic scheme principle and the beneficial effects are as follows:
the scheme tests the lighting performance of the vehicle headlamp from the whole vehicle level, includes the difference influences of installation, aiming and dimming and the like, and is more consistent with the use condition of the actual headlamp compared with the light distribution verification of the part level; and the scheme can directly test the illumination performance of the vehicle in the actual running process, and is more objective and accurate compared with static test.
By adopting the scheme, the illumination performance of the vehicle headlamp can be tested more truly, the accuracy of the illumination performance test is improved, the enterprise can be effectively helped to improve products, the technical development of the vehicle lamp is promoted, and the night driving safety of the vehicle is greatly improved.
Further, in step S1, when the test lane is determined, two adjacent straight lanes are used as the test lane or a curve of a single lane is used as the test lane.
Two different road types, straight and curved, can be tested.
Further, the motion data comprises data of the change of the driving track, the pitch angle and the position information along with time.
The separation distance between the front end of the vehicle and the origin of coordinates is calculated by using the motion data.
Further, in S5, acquiring driving information, determining whether the vehicle is a human driver or a robot driver based on the driving information, and if the vehicle is a human driver, setting a preset offset range to ± 30 cm; and if the robot is driven, setting the preset offset range to +/-10 cm.
Because the people are difficult to control the precision as the same as a robot, different preset deviation ranges are set, and the robot is more in line with the actual situation.
Further, in S5, the lateral deviation between the vehicle and the lane line is calculated based on the travel track and the lane line coordinates.
The accuracy is higher than using the position information to calculate the lateral deviation.
Further, in S6, calculating a distance between the front end of the vehicle and the origin of coordinates based on the vehicle position information, and obtaining data indicating a change in the distance with time; and correcting the reference data by using the spacing distance, the pitch angle and the height difference of the position of the lane line relative to the origin of coordinates to obtain corrected illumination data.
The influence of uneven road surface on the illumination data can be eliminated, and the accuracy of the illumination data can be improved.
Further, the illuminance data measuring points comprise a visibility reference measuring point and a glare reference measuring point; the visibility reference measuring point is positioned on the boundary line of the lane; the transverse distance between the glare reference measuring point and the lane line is 3.2-3.5 cm;
2 actual visibility measuring points are arranged at each visibility reference measuring point, and connecting lines of the 2 actual visibility measuring points pass through the visibility reference measuring points and are perpendicular to the ground; and 2 actual glare measuring points are arranged at the reference glare measuring points, and the connecting line of the 2 actual glare measuring points passes through the reference glare measuring points and is perpendicular to the bottom surface.
The measurement of visibility and glare is convenient to be respectively carried out; 2 visibility actual measurement points are arranged, 2 glare actual measurement points can be corrected conveniently, and measurement accuracy is improved.
Further, in S6, when the correction is performed on the reference data:
the formula for correcting the illumination data based on the visibility reference measuring point is shown as the following formula:
the formula for correcting the illuminance data based on the reference measurement point of glare is shown as follows:
in the formula, EcFor the corrected illumination data, htThe target height is 25cm or 110 cm; theta is a pitch angle, h is a height difference of the position of the lane line relative to the origin of coordinates, d is a spacing distance between the front end of the vehicle and the origin of coordinates, and h1And h2The heights of connecting lines of the 2 actual visibility measuring points vertical to the ground are respectively; e1And E 22, the data of the illuminance of the headlights of the vehicles at the actual visibility measuring points; h is3And h4The heights of connecting lines of the 2 actual measurement points of the glare perpendicular to the ground are respectively; e3And E4And 2, the illuminance data of the vehicle headlights at the actual measurement points of the glare.
Through the formula in the optimal scheme, illumination errors caused by uneven road surfaces and pitching postures of vehicle motion can be eliminated, and the accuracy of illumination data is improved.
Further, in S4, the vehicle is driven at a constant speed along the lane line.
Compared with variable-speed running, the obtained data of the change of the interval distance along with the time is more accurate.
Further, in the S6, h is not less than 10cm1，h2Not more than 40cm, and h1>h2；90≤h3，h4Less than or equal to 120cm, and h3>h4。
h1>h2，h3>h4Can avoid h1And h2Or h3And h4And the values are repeated, namely the heights of 2 actual measurement points with visibility are different, and the heights of 2 actual measurement points with glare are different.
Drawings
FIG. 1 is a flow chart of a first embodiment of a dynamic headlamp illumination performance testing method based on a whole vehicle;
FIG. 2 is a lane schematic diagram of a first embodiment of a dynamic headlamp illumination performance testing method based on a whole vehicle;
FIG. 3 is a schematic diagram of an illuminance data measurement point in an embodiment of a dynamic headlamp illumination performance testing method based on a whole vehicle;
FIG. 4 is a lane schematic diagram of a second embodiment of a dynamic headlamp illumination performance testing method based on a whole vehicle;
fig. 5 is a schematic diagram of two illumination data measurement points in an embodiment of a dynamic headlamp illumination performance testing method based on a whole vehicle.
Detailed Description
The following is further detailed by way of specific embodiments:
example one
As shown in fig. 1, the method for dynamically testing the illumination performance of the vehicle-based headlamp of the present embodiment includes the following steps:
s1, as shown in FIG. 2, determining a tested lane, in this embodiment, two adjacent straight lanes with a length of 200-250m and a width of 3.5-3.75m are used as the tested lane; in this embodiment, two straight lanes with a length of 250m and a width of 3.5m are specifically used as test lanes; marking a lane line at the center of a lane where a vehicle is located, recording coordinates of the lane line, taking a point which is away from the vehicle by a first preset length along the lane line as a driving terminal of the vehicle, setting the driving terminal as a coordinate origin, and establishing a coordinate system of a test system; in this embodiment, the first preset length is 250m, and in other embodiments, the first preset length is determined by the length of a lane, for example, a lane 200m long, and the first preset length is 200 m. In this embodiment, the lane line refers to a dividing line at the center of the lane.
S2, acquiring the height difference of the position of the lane line relative to the origin of coordinates at intervals of a second preset length along the lane direction of the vehicle as a h value, recording the coordinate value of the position in the coordinate system of the test system, and storing the coordinate value as lane line data; in other words, the lane line data includes the h value of the position and the x-axis coordinate value and the y-axis coordinate value in the test system coordinate system. The second preset length is 5-10m, specifically 5m in this embodiment.
S3, as shown in fig. 3, setting illuminance data measurement points on both sides of the origin of coordinates; the illuminance data measuring points include a visibility reference measuring point and a glare reference measuring point.
In the embodiment, the visibility reference measuring point is positioned on the boundary line of the two lanes, and the vertical height of the visibility reference measuring point and the ground is 25 cm; the transverse distance between the glare reference measuring point and the lane line is 3.2-3.5cm, and the vertical height of the glare reference measuring point and the ground is 110 cm; and the X-axis coordinates of the projection points of the visibility reference measuring point and the glare reference measuring point on the ground are both 0. In the present embodiment, the boundary line refers to the outermost drawn lines of the two lanes. In the embodiment, the number of visibility reference measuring points is 2, and each visibility reference measuring point corresponds to 2 visibility actual measuring points; the 2 visibility reference measuring points are respectively positioned on two boundary lines of the lane, the connecting lines of the 2 visibility actual measuring points pass through the visibility reference measuring points and are vertical to the ground, and the heights from the ground are h1And h2。
2 actual measurement points of glare are arranged at the reference measurement point of glare, and 2 actual measurement points of glareThe connecting line passes through the glare reference measuring point and is vertical to the bottom surface, and the height from the ground is h3And h4. Wherein h is more than or equal to 10cm1，h2Not more than 40cm, and h1>h2；90≤h3，h4Less than or equal to 120cm, and h3>h4。
S4, enabling the vehicle to run at a constant speed along the lane line and gradually approach the origin of coordinates; collecting motion data of a vehicle, wherein the motion data comprises data of a driving track, a pitch angle theta and position information changing along with time in the embodiment; and meanwhile, data of the change of the illuminance of the headlights of the vehicle along with time on the illuminance data measuring point are collected.
Wherein, the actual measuring point h of visibility1And h2On the headlamp of the last vehicle, the illumination data are respectively recorded as E1And E2. Actual measurement point h for glare3And h4On the headlamp of the last vehicle, the illumination data are respectively recorded as E3And E4. And the acquired time is recorded, in the embodiment, the time is GPS time, and the GPS time (namely atomic time) is higher than the UTC time (namely universal time), so that the accuracy is higher.
S5, calculating the transverse deviation (namely the deviation in the Y-axis direction) between the vehicle and the lane line based on the vehicle running track and the lane line coordinate, verifying whether the deviation is within a preset deviation range, and if the deviation is within the preset deviation range, the test is valid; if the deviation exceeds the preset deviation range, the test is invalid, and the step of S4 needs to be carried out again; in the embodiment, driving information is also acquired, whether the robot drives or the human drive is judged based on the driving information, and if the robot drives, the preset offset range is set to be +/-30 cm; and if the robot is driven, setting the preset offset range to +/-10 cm.
S6, calculating the spacing distance d between the front end of the vehicle and the origin of coordinates based on the vehicle position information to obtain data of the variation of the spacing distance d along with time; and correcting the illuminance data by using the spacing distance d, the pitch angle theta of the vehicle and the h value of the lane line, eliminating illuminance errors caused by uneven road surfaces and the pitch angle of vehicle motion, and obtaining corrected illuminance data.
The formula for correcting the illumination data based on the visibility reference measuring point is shown as the following formula:
the formula for correcting the illuminance data based on the reference measurement point of glare is shown as follows:
in the formula, EcFor the corrected illumination data, htThe target height is specifically the height of the visibility reference measuring point or the glare reference measuring point in the embodiment; the illuminance data correction formula based on the visibility reference measurement point is 25cm, and the illuminance data correction formula based on the glare reference measurement point is 110 cm. In other words, in this embodiment, the same illuminance data correction formula is used for the data collected at the actual visibility measurement points corresponding to the 2 visibility reference measurement points. The 2 visibility reference measuring points can respectively obtain corresponding corrected illumination data, namely two groups of corrected illumination data.
If h1And htCoincidence or h3And htIf they coincide, the above formula can be simplified as:
or
And S7, synchronously processing the interval distance and the corrected illumination data by using the GPS time to obtain an illumination data curve which changes along with the distance, namely a vehicle headlamp illumination performance curve.
Example two
The difference between the present embodiment and the first embodiment is that, when the dynamic test method for curve illumination performance of the vehicle-based headlamp in the present embodiment is applied to the curve test, a curve of a single lane with a length of 100-; in this embodiment, the length is specifically 120m, and the width is specifically 3.5 m;
in step S3, as shown in fig. 4, the visibility reference measurement point is located on the boundary line of the lane, and the vertical distance from the visibility reference measurement point to the ground is 25 cm; the transverse distance between the glare reference measuring point and a lane line of a lane where the vehicle is located is 3.2-3.5cm, and the distance between the glare reference measuring point and the lane line is 110cm from the ground; and the X-axis coordinates of the projection points of the visibility reference measuring point and the glare reference measuring point on the ground are both 0. In the present embodiment, the boundary line refers to the outermost line of the single lane.
As shown in fig. 5, 2 actual visibility measuring points are provided at each visibility reference measuring point, the connection lines of the 2 actual visibility measuring points pass through the visibility reference measuring points and are perpendicular to the ground, and the heights from the ground are h1And h2。
2 actual measurement points of glare are arranged at the reference measurement points of glare, the connecting lines of the 2 actual measurement points of glare pass through the reference measurement points of glare and are vertical to the bottom surface, and the heights from the ground are h3And h4. Wherein h is more than or equal to 10cm1，h2Not more than 40cm, and h1>h2；90≤h3，h4Less than or equal to 120cm, and h3>h4。
Other testing steps are the same as those in the first embodiment, and are not described herein again.
The above are merely examples of the present invention, and the present invention is not limited to the field related to this embodiment, and the common general knowledge of the known specific structures and characteristics in the schemes is not described herein too much, and those skilled in the art can know all the common technical knowledge in the technical field before the application date or the priority date, can know all the prior art in this field, and have the ability to apply the conventional experimental means before this date, and those skilled in the art can combine their own ability to perfect and implement the scheme, and some typical known structures or known methods should not become barriers to the implementation of the present invention by those skilled in the art in light of the teaching provided in the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. A dynamic test method for the lighting performance of a headlamp based on a whole vehicle is characterized by comprising the following steps:
s1, determining a tested lane, marking a lane line at the center of the lane, recording coordinates of the lane line, and establishing a coordinate system of the test system by taking a point which is a first preset length away from a vehicle along the lane line as an origin of coordinates;
s2, acquiring the height difference of the position of the lane line relative to the origin of coordinates and the coordinate value of the position in the coordinate system of the test system at intervals of a second preset length along the lane direction, and storing the height difference and the coordinate value as lane line data;
s3, setting illumination data measuring points on two sides of the origin of coordinates;
s4, enabling the vehicle to run along the lane line, collecting the motion data of the vehicle, and collecting the data of the change of the illuminance of the headlight of the vehicle along with the time on the illuminance data measuring point;
s5, calculating the transverse deviation between the vehicle and the lane line based on the motion data and the lane line coordinates, and verifying whether the transverse deviation is within a preset deviation range or not, wherein the test is effective within the preset deviation range; if the deviation exceeds the preset deviation range, the test is invalid, and the step of S4 is carried out again;
s6, calculating the spacing distance between the front end of the vehicle and the origin of coordinates by using the motion data to obtain data of the variation of the spacing distance along with time; correcting the illumination data by using the interval distance, the motion data and the lane line data to obtain the illumination data which changes along with time after correction;
s7, the interval distance and the corrected illuminance data are synchronized with time to obtain an illuminance data curve varying with the interval distance.
2. The dynamic test method for the lighting performance of the whole vehicle-based headlamp according to claim 1, characterized in that: in S1, when the test lane is determined, two adjacent straight lanes are used as the test lane or a single curved lane is used as the test lane.
3. The dynamic test method for the lighting performance of the whole vehicle-based headlamp according to claim 2, characterized in that: the motion data comprises data of the change of the driving track, the pitch angle and the position information along with time.
4. The dynamic test method for the lighting performance of the whole vehicle-based headlamp according to claim 3, characterized in that: in S5, acquiring driving information, determining whether the vehicle is a human drive or a robot drive based on the driving information, and if the vehicle is a human drive, setting a preset offset range to ± 30 cm; and if the robot is driven, setting the preset offset range to +/-10 cm.
5. The dynamic test method for the lighting performance of the whole vehicle-based headlamp according to claim 4, characterized in that: in S5, the lateral deviation between the vehicle and the lane line is calculated based on the travel track and the lane line coordinates.
6. The dynamic test method for the lighting performance of the whole vehicle-based headlamp according to claim 5, characterized in that: in the step S6, calculating a distance between the front end of the vehicle and the origin of coordinates based on the vehicle position information, to obtain data indicating a change in the distance with time; and correcting the reference data by using the spacing distance, the pitch angle and the height difference of the position of the lane line relative to the origin of coordinates to obtain corrected illumination data.
7. The dynamic test method for the lighting performance of the whole vehicle-based headlamp according to claim 6, characterized in that: the illuminance data measuring points comprise visibility reference measuring points and glare reference measuring points; the visibility reference measuring point is positioned on the boundary line of the lane; the transverse distance between the glare reference measuring point and the lane line is 3.2-3.5 cm;
2 actual visibility measuring points are arranged at each visibility reference measuring point, and connecting lines of the 2 actual visibility measuring points pass through the visibility reference measuring points and are perpendicular to the ground; and 2 actual glare measuring points are arranged at the reference glare measuring points, and the connecting line of the 2 actual glare measuring points passes through the reference glare measuring points and is perpendicular to the bottom surface.
8. The vehicle-based headlamp illumination performance dynamic test method according to claim 7, characterized in that: in S6, when the control data is corrected:
the formula for correcting the illumination data based on the visibility reference measuring point is shown as the following formula:
the formula for correcting the illuminance data based on the reference measurement point of glare is shown as follows:
in the formula, EcFor the corrected illumination data, htThe target height is 25cm or 110 cm; theta is a pitch angle, h is a height difference of the position of the lane line relative to the origin of coordinates, d is a spacing distance between the front end of the vehicle and the origin of coordinates, and h1And h2The heights of connecting lines of the 2 actual visibility measuring points vertical to the ground are respectively; e1And E22, the data of the illuminance of the headlights of the vehicles at the actual visibility measuring points; h is3And h4The heights of connecting lines of the 2 actual measurement points of the glare perpendicular to the ground are respectively; e3And E4And 2, the illuminance data of the vehicle headlights at the actual measurement points of the glare.
9. The vehicle-based headlamp illumination performance dynamic test method according to claim 8, characterized in that: in S4, the vehicle is driven at a constant speed along the lane line.
10. The vehicle-based headlamp illumination performance dynamic test method according to claim 8, characterized in that: in the S6, h is more than or equal to 10cm1，h2Not more than 40cm, and h1>h2；90≤h3，h4Less than or equal to 120cm, and h3>h4。
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Application publication date: 20200828 |