阅读说明：本技术 一种车辆前大灯照明性能的动态测试系统 (Dynamic test system for illumination performance of vehicle headlamp ) 是由 陈媛媛 张强 李朝斌 陈涛 邢春鸿 李林 张云飞 于 2020-06-10 设计创作，主要内容包括：本发明涉及车辆测试技术领域,具体公开了一种车辆前大灯照明性能的动态测试系统,包括：运动信息采集子系统,用于采集GPS时间、车辆的位置信息和俯仰角；照度数据采集子系统,用于采集预设照度数据测量点上车辆前大灯的照度数据,以及GPS时间；数据分析子系统,用于根据预设的坐标原点以及车辆的位置信息,计算测试过程中车辆前端与坐标原点之间的间隔距离,并记录GPS时间；还用于根据俯仰角、间隔距离和高度差数据,对照度数据进行修正,得到修正后的照度数据；还用于以GPS时间为基准,将修正后的照度数据与车辆的间隔距离进行同步处理,生成照度随距离变化的曲线。采用本发明的技术方案能够提高照明性能测试的准确性。(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.)

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, E_cFor the corrected illumination data, h_tThe 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, E_cFor the corrected illumination data, h_tHeight 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.

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, E_cFor the corrected illumination data, h_tThe 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, E_cFor the corrected illumination data, h_tHeight 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: