CN111595562A - Dynamic test system for illumination performance of vehicle headlamp - Google Patents
Dynamic test system for illumination performance of vehicle headlamp Download PDFInfo
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Abstract
The invention relates to the technical field of vehicle testing, and particularly discloses a dynamic testing system for the lighting performance of a vehicle headlamp, which comprises: the motion information acquisition subsystem is used for acquiring GPS time, position information and a pitch angle of the vehicle; the illumination data acquisition subsystem is used for acquiring illumination data of a vehicle headlamp on a preset illumination data measuring point and GPS time; the data analysis subsystem is used for calculating the spacing distance between the front end of the vehicle and the coordinate origin in the test process according to the preset coordinate origin and the position information of the vehicle, and recording the GPS time; the illumination control system is also used for correcting the reference data according to the pitch angle, the spacing distance and the height difference data to obtain corrected illumination data; and the system is also used for carrying out synchronous processing on the corrected illumination data and the spacing distance of the vehicle by taking the GPS time as a reference so as to generate a curve of illumination changing along with the 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 system for the lighting performance of a vehicle headlamp.
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 headlights are used as the eyes of the automobile, and the good headlights can improve the driving safety at night, so that a driver can drive more easily and comfortably at night, and therefore, strict requirements are put forward on the lighting performance of the headlights of the automobile.
The existing national standard only restricts the illumination requirement of a headlamp from the light distribution angle, which is a technical requirement at the level of 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. Especially, 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 existing light distribution standard cannot meet the test requirement of the illumination performance of the real vehicle.
Therefore, a whole-vehicle-level dynamic test system capable of improving the test accuracy of the illumination performance is needed.
Disclosure of Invention
The invention provides a dynamic test system for the lighting performance of a vehicle headlamp, 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 system for vehicle headlamp illumination performance, comprising:
the motion information acquisition subsystem is used for acquiring coordinate information of a preset lane line in a test lane and height difference data relative to a preset coordinate origin, and is also used for acquiring GPS time, position information of a vehicle and a pitch angle;
the illumination data acquisition subsystem is used for acquiring illumination data of a vehicle headlamp on a preset illumination data measuring point and GPS time;
the data analysis subsystem is used for calculating the spacing distance between the front end of the vehicle and the coordinate origin in the test process according to the preset coordinate origin and the position information of the vehicle, and recording the GPS time; the illumination control system is also used for correcting the reference data according to the pitch angle, the spacing distance and the height difference data to obtain corrected illumination data; and the system is also used for carrying out synchronous processing on the corrected illumination data and the spacing distance of the vehicle by taking the GPS time as a reference so as to generate a curve of illumination changing along with the 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.
Furthermore, the motion information acquisition subsystem comprises a GPS differential positioning module, a lane data acquisition module, a motion information acquisition module and a first GPS signal receiving module, wherein the motion information acquisition module and the first GPS signal receiving module are arranged on the vehicle;
the GPS differential positioning module is used for receiving GPS satellite signals, calculating distance correction numbers from a reference station to a satellite according to preset precise coordinates of the reference station, and sending the distance correction numbers to the first GPS signal receiving module in real time;
the first GPS signal receiving module is used for receiving GPS satellite signals and distance correction numbers sent by a reference station, acquiring GPS time based on the GPS satellite signals and correcting positioning results of the GPS time to obtain position information of a vehicle and sending the position information to the motion information acquisition module;
the lane data acquisition module is used for acquiring coordinate information of lane lines in the test lane and height difference data relative to the origin of coordinates and sending the coordinate information and the height difference data to the motion information acquisition module;
the motion information acquisition module is also used for acquiring the pitch angle of the vehicle.
The positioning result is corrected, so that the positioning precision of the vehicle can be improved, and the subsequent measurement is facilitated.
Further, the illumination data acquisition subsystem comprises an illumination measurement module, an illumination data acquisition module and a second GPS signal receiving module;
the illumination measurement module is used for measuring illumination data of a vehicle headlamp on a preset illumination data measurement point and sending the illumination data to the illumination data acquisition module;
the second GPS signal receiving module is used for receiving GPS time in the GPS satellite signals and sending the GPS time to the illumination data acquisition module;
the illumination data acquisition module is used for acquiring illumination data of a vehicle headlamp on a preset illumination data measuring point in the test process and acquiring GPS time from the second GPS signal receiving module.
The illumination data acquisition module acquires illumination data and GPS time information at the same time, so that basic data can be provided for subsequent processing.
Further, the data analysis subsystem comprises an illumination data correction module, a vehicle distance calculation module and a data synchronous processing module;
the vehicle distance calculation module is used for acquiring position information from the motion information acquisition module and calculating the spacing distance between the front end of the vehicle and the coordinate origin in the test process according to a preset coordinate origin and the position information of the vehicle;
the illumination data correction module is used for acquiring pitch angle from the motion information acquisition module, acquiring spacing distance from the vehicle distance calculation module and height difference data from the lane line data acquisition module, and correcting the illumination data to obtain corrected illumination data;
and the data synchronization processing module is used for performing synchronization processing on the corrected illumination data and the spacing distance of the vehicle by taking the GPS time as a reference so as to generate a curve of illumination changing along with the distance.
Because the influence of the change of the vehicle motion pitch angle and the unevenness of the road surface can cause the measurement error of the illumination data, the two errors need to be eliminated, and the measurement accuracy is improved.
Further, the motion information acquisition module is also used for acquiring the running track of the vehicle;
the data analysis subsystem further comprises an effectiveness judgment module, the effectiveness judgment module is used for acquiring the coordinate information of the lane line from the lane data acquisition module and acquiring the driving track from the motion information acquisition module, and the transverse deviation of the vehicle is calculated based on the coordinate information of the lane line and the driving track; verifying whether the transverse deviation is within a preset deviation range, and if so, generating test effective information; and if the deviation exceeds the preset deviation range, generating test invalid information.
The lateral deviation of the vehicle can influence the accuracy of measurement, and test invalid information is generated within a preset deviation range; the data collected when the lateral deviation is too large can be avoided being adopted.
Further, the effectiveness judging module is also used for acquiring driving information; the driving information includes human driving or robot driving; if the driver drives the vehicle, the effectiveness judging module is also used for setting the preset offset range to be +/-30 cm; the validity determination module is further configured to set the preset offset range to ± 10cm in case of robot driving.
Because the same control precision of a robot is difficult to achieve by human beings, different preset offset ranges are set, and the method is more suitable for actual conditions.
Further, the illuminance data measuring points comprise visibility reference measuring points and 2 visibility actual measuring points; the visibility reference measuring point is positioned on the boundary line of the lane; the connecting line of the 2 visibility actual measuring points passes through the visibility reference measuring point and is vertical to the ground.
Set up 2 visibility actual measurement points and can be convenient for rectify, improve measurement accuracy.
Further, the illuminance data measurement points comprise a glare reference measurement point and 2 glare actual measurement points; the transverse distance between the glare reference measuring point and the lane line is 3.2-3.5 cm; the connecting line of the 2 actual measurement points of the glare passes through the reference measurement point of the glare and is vertical to the bottom surface.
The 2 actual measurement points of the glare can be conveniently corrected, and the measurement precision is improved.
Further, the illumination data correction module corrects the illumination data;
the formula for correcting the illumination data based on the visibility reference measuring point is shown as the following formula:
in the formula, EcFor the corrected illumination data, htThe height of a visibility reference measurement point; 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, and h is1And h2The heights of connecting lines of the 2 actual visibility measuring points vertical to the ground are respectively; e1And E2The illuminance data of the headlights of the vehicles at 2 actual visibility measurement points are obtained.
By the formula, 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, the illumination data correction module corrects the illumination data;
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, htHeight of the reference measurement point for glare; 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, and h is3And h4The heights of connecting lines of the 2 actual measurement points of the glare perpendicular to the ground are respectively; e3And E4Illuminance data of the vehicle headlights at 2 actual measurement points for glare.
By the formula, illumination errors caused by uneven road surfaces and pitching postures of vehicle motion can be eliminated, and the accuracy of illumination data is improved.
Drawings
FIG. 1 is a logic block diagram of a dynamic test system for the illumination performance of a vehicle headlamp according to an embodiment;
FIG. 2 is a flowchart of a dynamic testing method for the illumination performance of a headlamp of a vehicle according to an embodiment;
FIG. 3 is a schematic lane view illustrating a dynamic testing method for the illumination performance of a headlamp of a vehicle according to an embodiment;
FIG. 4 is a schematic diagram of illumination data measuring points of a dynamic test method for the illumination performance of a headlamp of a vehicle according to an embodiment;
FIG. 5 is a schematic lane view illustrating a dynamic testing method for the illumination performance of a headlamp of a vehicle according to a second embodiment of the present invention;
fig. 6 is a schematic diagram of illumination data measuring points of a dynamic test method for the illumination performance of a headlamp of a vehicle according to a second embodiment.
Detailed Description
The following is further detailed by way of specific embodiments:
example one
As shown in fig. 1, the dynamic testing system for the lighting performance of the vehicle headlamp of the present embodiment includes a motion information collecting subsystem, an illumination data collecting subsystem, and a data analyzing subsystem.
The motion information acquisition subsystem comprises a GPS differential positioning module, a lane data acquisition module, a motion information acquisition module and a first GPS signal receiving module which are arranged on the vehicle,
the illumination data acquisition subsystem comprises an illumination measurement module, an illumination data acquisition module and a second GPS signal receiving module.
The data analysis subsystem comprises an effectiveness judgment module, an illumination data correction module, a vehicle distance calculation module and a data synchronization processing module.
The GPS differential positioning module is used for receiving GPS satellite signals, calculating distance correction numbers from a reference station to a satellite according to preset precise coordinates of the reference station, and transmitting the distance correction numbers to the first GPS signal receiving module in real time;
the first GPS signal receiving module is used for receiving GPS satellite signals and distance correction numbers sent by a reference station, correcting positioning results of the distance correction numbers, acquiring GPS time based on the GPS satellite signals, obtaining position information of a vehicle and sending the position information to the motion information acquisition module;
the lane data acquisition module is used for acquiring coordinate information of a lane line in the test lane and height difference data relative to a preset coordinate origin and sending the coordinate information and the height difference data to the motion information acquisition module;
the motion information acquisition module is also used for acquiring the speed, the pitch angle and the running track of the vehicle.
The illumination measurement module is used for measuring illumination data of a vehicle headlamp on an illumination data measurement point and sending the illumination data to the illumination data acquisition module;
and the second GPS signal receiving module is used for receiving the GPS satellite signal and sending the GPS satellite signal to the illumination data acquisition module. Specifically, the method is used for receiving GPS time in a GPS signal;
and the illumination data acquisition module is used for acquiring illumination data of the vehicle headlights at the preset illumination data measuring point in the test process and acquiring the GPS time from the second GPS signal receiving module.
The illuminance data measuring points comprise visibility reference measuring points and 2 corresponding visibility actual measuring points; the visibility reference measuring point is positioned on the boundary line of the lane; the connecting line of the 2 visibility actual measuring points passes through the visibility reference measuring point and is vertical to the ground. In this embodiment, the number of visibility reference measuring points is 2, and 1 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 device also comprises a glare reference measuring point and 2 glare actual measuring points; the transverse distance between the glare reference measuring point and the lane line is 3.2-3.5 cm; the connecting line of the 2 actual measurement points of the glare passes through the reference measurement point of the glare and is vertical to the bottom surface.
The effectiveness judging module is used for acquiring the coordinate information of the lane line from the lane data acquisition module and acquiring the driving track from the motion information acquisition module, judging the transverse deviation of the vehicle based on the coordinate information of the lane line and the driving track, verifying whether the transverse deviation is within a preset deviation range, and generating test effective information if the transverse deviation is within the preset deviation range; and if the deviation exceeds the preset deviation range, generating test invalid information.
In this embodiment, the effectiveness determination module is further configured to obtain driving information; the driving information includes human driving or robot driving; if the driver drives the vehicle, the effectiveness judging module is also used for setting the preset offset range to be +/-30 cm; the validity determination module is further configured to set the preset offset range to ± 10cm in case of robot driving.
And the vehicle distance calculation module is used for acquiring the position information from the motion information acquisition module and calculating the spacing distance between the front end of the vehicle and the origin of coordinates in the test process according to the preset origin of coordinates and the position information of the vehicle.
And the illumination data correction module is used for obtaining the altitude difference data from the lane line data acquisition module according to the pitch angle obtained from the motion information acquisition module and the spacing distance obtained from the vehicle distance calculation module, and correcting the illumination data to obtain the corrected illumination data. Because the illumination data measurement error may be caused by the change of the vehicle motion pitch angle and the influence of the uneven road surface, the two errors need to be eliminated to obtain the corrected illumination 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 height of the visibility reference measuring point or the glare reference measuring point is 25cm in an illumination data correction formula based on the visibility reference measuring point, and the height of the glare reference measuring point is 110cm in an illumination data correction formula based on the glare reference measuring point; 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 E2The method comprises the following steps of obtaining illumination data of headlights of vehicles at 2 actual visibility measurement points; h is3And h4The heights of connecting lines of the 2 actual measurement points of the glare perpendicular to the ground are respectively; e3And E4Illuminance data of the vehicle headlights at 2 actual measurement points for glare. 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.
And the data synchronization processing module is used for performing synchronization processing on the corrected illumination data and the spacing distance of the vehicle by taking the GPS time as a reference so as to generate a curve of illumination changing along with the distance. Namely, the lighting performance curve of the vehicle headlamp is obtained. Specifically, a curve of visibility illuminance changing with distance and a curve of glare illuminance changing with distance can be obtained.
As shown in fig. 2, based on a dynamic test system for the illumination performance of the vehicle headlamp, the present embodiment further provides a dynamic test method for the illumination performance of the vehicle headlamp, including the following steps:
s1, as shown in FIG. 3, 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 coordinate information 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 height difference data of the position of the lane line relative to the origin of coordinates at intervals of a second preset length along the direction of the lane where the vehicle is located by the lane data acquisition module as an h value, recording coordinate values of the position in a coordinate system of the test system, and storing the coordinate values 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. 4, 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 number of the visibility reference measuring points is 2, the visibility reference measuring points are respectively positioned on the boundary lines of the two lanes, and the vertical height of the visibility reference measuring points to 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.
2 actual visibility measuring points are arranged at each visibility reference measuring point, connecting 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。
S4, enabling the vehicle to run at a constant speed along the lane line and gradually approach the origin of coordinates; the method comprises the steps that motion data of a vehicle are collected through a motion information collection module, wherein the motion data comprise data of speed, a running 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 vehicle headlamp on the illuminance data measuring point along with the time are acquired through the illuminance data acquisition module.
Wherein, the actual measuring point h of visibility1And h2The data of the change of the illuminance of the headlamp of the last vehicle along with the time are respectively recorded as E1And E2. Actual measurement point h for glare3And h4The data of the change of the illuminance of the headlamp of the last vehicle along with the time are respectively recorded as E3And E4. In this embodiment, the time is GPS time, and the GPS time (i.e., atomic time) is higher in accuracy than the UTC time (i.e., universal time).
S5, calculating the transverse deviation (namely the deviation in the Y-axis direction) between the vehicle and the lane line through the effectiveness judging module based on the vehicle running track and the lane line coordinate information, verifying whether the transverse deviation is within a preset deviation range, and testing to be effective if the transverse deviation is within the preset deviation range; 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 vehicle is driven by a human or a robot is judged based on the driving information, and if the vehicle is driven by a human, 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, the vehicle distance calculation module calculates the spacing distance d between the front end of the vehicle and the origin of coordinates based on the position information of the vehicle, and data of the spacing distance d changing along with the GPS time is obtained; the illuminance data modification module modifies the illuminance data by using the spacing distance d, the pitch angle theta of the vehicle and the h value of the lane line, eliminates illuminance errors caused by uneven road surfaces and the pitch angle of vehicle motion, and obtains the illuminance data which changes along with the GPS time after modification.
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 height of the visibility reference measuring point or the glare reference measuring point; 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.
If h1And htCoincidence or h3And htIf they coincide, the above formula can be simplified as:
or
And S7, the data synchronization processing module performs synchronization processing on 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. Specifically, a visibility illuminance curve varying with distance and a glare illuminance curve varying with distance are obtained.
Example two
The difference between the present embodiment and the first embodiment is that, when the dynamic testing method for the lighting performance of the vehicle 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. 5, 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. 6, 2 visibility actual measurement points are provided at each visibility reference measurement point, and the connecting lines of the 2 visibility actual measurement points pass through the visibility reference measurement points and are perpendicular to the ground, and the heights from the ground are h1 and h2, respectively.
And 2 actual glare measuring points are arranged at the reference glare measuring point, connecting lines of the 2 actual glare measuring points pass through the reference glare measuring points and are perpendicular to the bottom surface, and the heights from the ground are h3 and h4 respectively. Wherein h1 is more than or equal to 10cm, h2 is more than or equal to 40cm, and h1 is more than or equal to h 2; h3 is more than or equal to 90, h4 is more than or equal to 120cm, and h3 is more than or equal to h 4.
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 system for vehicle headlamp illumination performance, comprising:
the motion information acquisition subsystem is used for acquiring coordinate information of a preset lane line in a test lane and height difference data relative to a preset coordinate origin, and is also used for acquiring GPS time, position information of a vehicle and a pitch angle;
the illumination data acquisition subsystem is used for acquiring illumination data of a vehicle headlamp on a preset illumination data measuring point and GPS time;
the data analysis subsystem is used for calculating the spacing distance between the front end of the vehicle and the coordinate origin in the test process according to the preset coordinate origin and the position information of the vehicle, and recording the GPS time; the illumination control system is also used for correcting the reference data according to the pitch angle, the spacing distance and the height difference data to obtain corrected illumination data; and the system is also used for carrying out synchronous processing on the corrected illumination data and the spacing distance of the vehicle by taking the GPS time as a reference so as to generate a curve of illumination changing along with the distance.
2. The system for dynamically testing the illumination performance of a vehicle headlamp according to claim 1, characterized in that: the motion information acquisition subsystem comprises a GPS differential positioning module, a lane data acquisition module, a motion information acquisition module and a first GPS signal receiving module, wherein the motion information acquisition module and the first GPS signal receiving module are arranged on a vehicle;
the GPS differential positioning module is used for receiving GPS satellite signals, calculating distance correction numbers from a reference station to a satellite according to preset precise coordinates of the reference station, and sending the distance correction numbers to the first GPS signal receiving module in real time;
the first GPS signal receiving module is used for receiving GPS satellite signals and distance correction numbers sent by a reference station, acquiring GPS time based on the GPS satellite signals and correcting positioning results of the GPS time to obtain position information of a vehicle and sending the position information to the motion information acquisition module;
the lane data acquisition module is used for acquiring coordinate information of lane lines in the test lane and height difference data relative to the origin of coordinates and sending the coordinate information and the height difference data to the motion information acquisition module;
the motion information acquisition module is also used for acquiring the pitch angle of the vehicle.
3. The system for dynamically testing the illumination performance of a vehicle headlamp according to claim 2, characterized in that: the illumination data acquisition subsystem comprises an illumination measurement module, an illumination data acquisition module and a second GPS signal receiving module;
the illumination measurement module is used for measuring illumination data of a vehicle headlamp on a preset illumination data measurement point and sending the illumination data to the illumination data acquisition module;
the second GPS signal receiving module is used for receiving GPS time in the GPS satellite signals and sending the GPS time to the illumination data acquisition module;
the illumination data acquisition module is used for acquiring illumination data of a vehicle headlamp on a preset illumination data measuring point in the test process and acquiring GPS time from the second GPS signal receiving module.
4. The system for dynamically testing the illumination performance of a vehicle headlamp according to claim 3, characterized in that: the data analysis subsystem comprises an illumination data correction module, a vehicle distance calculation module and a data synchronous processing module;
the vehicle distance calculation module is used for acquiring position information from the motion information acquisition module and calculating the spacing distance between the front end of the vehicle and the coordinate origin in the test process according to a preset coordinate origin and the position information of the vehicle;
the illumination data correction module is used for acquiring pitch angle from the motion information acquisition module, acquiring spacing distance from the vehicle distance calculation module and height difference data from the lane line data acquisition module, and correcting the illumination data to obtain corrected illumination data;
and the data synchronization processing module is used for performing synchronization processing on the corrected illumination data and the spacing distance of the vehicle by taking the GPS time as a reference so as to generate a curve of illumination changing along with the distance.
5. The system for dynamically testing the illumination performance of a vehicle headlamp according to claim 4, characterized in that: the motion information acquisition module is also used for acquiring the running track of the vehicle;
the data analysis subsystem further comprises an effectiveness judgment module, the effectiveness judgment module is used for acquiring the coordinate information of the lane line from the lane data acquisition module and acquiring the driving track from the motion information acquisition module, and the transverse deviation of the vehicle is calculated based on the coordinate information of the lane line and the driving track; verifying whether the transverse deviation is within a preset deviation range, and if so, generating test effective information; and if the deviation exceeds the preset deviation range, generating test invalid information.
6. The system for dynamically testing the illumination performance of a vehicle headlamp according to claim 5, characterized in that: the effectiveness judging module is also used for acquiring driving information; the driving information includes human driving or robot driving; if the driver drives the vehicle, the effectiveness judging module is also used for setting the preset offset range to be +/-30 cm; the validity determination module is further configured to set the preset offset range to ± 10cm in case of robot driving.
7. The system for dynamically testing the illumination performance of a vehicle headlamp according to claim 6, characterized in that: the illuminance data measuring points comprise visibility reference measuring points and 2 visibility actual measuring points; the visibility reference measuring point is positioned on the boundary line of the lane; the connecting line of the 2 visibility actual measuring points passes through the visibility reference measuring point and is vertical to the ground.
8. The system for dynamically testing the illumination performance of a vehicle headlamp according to claim 6, characterized in that: the illuminance data measuring points comprise a glare reference measuring point and 2 glare actual measuring points; the transverse distance between the glare reference measuring point and the lane line is 3.2-3.5 cm; the connecting line of the 2 actual measurement points of the glare passes through the reference measurement point of the glare and is vertical to the bottom surface.
9. The system for dynamically testing the illumination performance of a vehicle headlamp according to claim 7, characterized in that: when the illumination data correction module corrects the illumination data;
the formula for correcting the illumination data based on the visibility reference measuring point is shown as the following formula:
in the formula, EcFor the corrected illumination data, htThe height of a visibility reference measurement point; 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, and h is1And h2The heights of connecting lines of the 2 actual visibility measuring points vertical to the ground are respectively; e1And E2The illuminance data of the headlights of the vehicles at 2 actual visibility measurement points are obtained.
10. The system for dynamically testing the illumination performance of a vehicle headlamp according to claim 8, characterized in that: when the illumination data correction module corrects the illumination data;
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, htHeight of the reference measurement point for glare; theta is a pitch angle, and h is the position of the lane lineHeight difference relative to origin of coordinates, d is spacing distance, h3And h4The heights of connecting lines of the 2 actual measurement points of the glare perpendicular to the ground are respectively; e3And E4Illuminance data of the vehicle headlights at 2 actual measurement points for glare.
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