CN109969070B - Method for measuring and calculating traffic safety glare threshold of vehicle headlamp - Google Patents
Method for measuring and calculating traffic safety glare threshold of vehicle headlamp Download PDFInfo
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- CN109969070B CN109969070B CN201910166440.7A CN201910166440A CN109969070B CN 109969070 B CN109969070 B CN 109969070B CN 201910166440 A CN201910166440 A CN 201910166440A CN 109969070 B CN109969070 B CN 109969070B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
- B60W40/08—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to drivers or passengers
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Abstract
The invention discloses a method for measuring and calculating a traffic safety glare threshold value of a vehicle headlamp, which is characterized in that the influence degree of the headlamp glare on the safety vision of a driver is represented by the vertical illuminance generated by a light source of the vehicle headlamp at the eye position of the driver; the method comprises the following steps: 1) setting a background environment; 2) measuring headlamp light source characteristic data; 3) setting the relative position of the headlamp and the sight of a driver; 4) setting a safe visual perception glare grade scale; 5) the driver target object visually recognizes and measures the vertical illumination at the eye position of the driver; 6) resetting the relative position and angle of the headlamp and the sight line of the driver, and repeating the step 5); 7) and giving out a glare threshold value according to the obtained data processing result and the traffic safety glare three-dimensional influence area. The method provided by the invention is used for calculating the traffic safety glare of the vehicle headlamp on a road without illumination at night, and the light source characteristics, background environment factors, relative position factors and the safety visual recognition requirements of a driver of the vehicle headlamp are considered, so that a good basis is provided for the road anti-glare facility.
Description
Technical Field
The invention relates to the technical field of road glare, in particular to a method for measuring and calculating a traffic safety glare threshold of a headlamp of a non-illuminated road during night driving.
Background
The anti-dazzle facilities on the highway are unreasonable in height, and the safety and comfort of driving at night are directly influenced. The height of the anti-dazzle facility is too high, and although the anti-dazzle facility has a good anti-dazzle effect, the transverse visual field is insufficient, the space oppression sense is strong, and the economy is not achieved; if the set height is insufficient, when the light of the head lamp of the opposite vehicle enters the eyes of a driver with certain intensity, the vision of the driver is reduced, even the visibility is lost in a short time, or traffic accidents are caused by tension. In the prior anti-dazzle technology, simple design is only carried out on the aspects of the visual recognition height, the lamp height, the lane width and the like of a straight line section by a driver.
At present, few researches on traffic safety glare of vehicle headlamps are conducted at home and abroad, most of the researches are based on achievements in the field of road lighting glare, and researches on headlamp light source characteristics and driver safety visual recognition requirements are not involved. The influence factors for establishing the glare threshold value are not considered, and no measurement method related to the three-dimensional influence area of the glare and the glare threshold value is provided.
Disclosure of Invention
The invention aims to solve the defects of the existing anti-dazzle facility setting technology, provides a method for measuring and calculating a traffic safety glare threshold value of a vehicle headlamp on a non-lighting road at night, which is reliable in basis and simple and convenient to operate, relates to light source characteristics, relative positions of the headlamp and the sight of a driver and background environment factors, and establishes a glare threshold value measuring and calculating system by representing the influence degree of the glare of the headlamp by the vertical illumination of the eyes of the driver according to the safety visual recognition requirements of the driver.
The invention provides a method for measuring and calculating a traffic safety glare threshold of a vehicle headlamp, which comprises the following steps of:
the method comprises the following steps: and configuring a background environment.
Step two: measuring light source characteristic data of a vehicle headlamp;
the headlamp light source characteristic data comprises a color temperature curve, a maximum light intensity curve and an equal illumination curve.
Step three: setting relative positions of the headlamp and the sight of a driver;
adjusting the relative position of the headlamp and a driver, obtaining the running conditions of the vehicle on various linear road sections such as a concave vertical curve, a convex vertical curve, a flat curve, a straight line, a flat longitudinal combined line and the like, and analyzing the influence of relative position and angle factors on glare;
the relative position of the headlamp and the driver comprises the angle, the longitudinal distance, the transverse distance and the vertical distance of the headlamp and the sight line of the driver.
Step four: setting a safe visual perception glare grade scale;
the physiological stress reaction generated by different influence degrees of the glare is considered in a safe vision mode in the driving process of a driver, and the glare is divided into two grades: glare rating 1-interference glare, glare rating 2-tolerance glare.
Step five: the target object of the driver visually recognizes and measures the vertical illumination of the eye position of the driver;
placing a small target object on the road surface 110m right ahead of the visual position of the driver, wherein the surface reflection coefficient of the small target object is a gray cube with the side length of 20cm and the reflection coefficient of the gray cube is 0.2;
performing target object visual recognition to obtain a light intensity maximum point, a reference line and an interference-tolerance reference point, wherein the visual recognition step comprises the following steps:
1) adjusting the central line of the headlamp to a horizontal position, and enabling the light beam to naturally fall;
2) the driver was acclimated for 10 minutes in the background environment;
3) selecting a longitudinal section, enabling a driver to directly look at a front sight line to move up and down under the longitudinal section, finding and recording the height with the strongest glare, wherein a horizontal line where the height is located is a datum line;
4) the driver moves right at the height of the datum line, and the moving distance is recorded as the transverse distance; determining a demarcation point of a glare grade 1 and a glare grade 2 according to a safety visual recognition glare grade scale, recording the demarcation point as an interference-tolerance datum point, and measuring and recording the vertical illumination data of the human eye position of the demarcation point;
5) according to the transverse distance of the 'interference-tolerance' reference point, determining an equal illumination curve of the reference point on the longitudinal distance section;
6) the driver determines the positions of all points at the interference-tolerance glare grade near the equal illumination curve, measures and records the vertical illumination data at the positions of the eyes of all points, and connects all points to obtain an interference-tolerance glare grade boundary line;
7) resetting the longitudinal section and repeating the steps from 3) to 6);
8) resetting the relative position and repeating the steps 3) to 7).
Step six: obtaining a glare threshold value;
processing and analyzing the acquired visual recognition data under the interference-tolerance glare grade to obtain an interference-tolerance glare plane influence area of each longitudinal section; obtaining a three-dimensional glare influence area at a relative position by processing data of glare plane influence areas of different longitudinal sections; obtaining three-dimensional influence areas of the glare under different relative positions by using the same data processing method;
and processing and analyzing the illuminance data of the measured interference-allowable glare grade boundary line to obtain glare threshold values of sections of the vehicle headlamp with different longitudinal distances.
In the step one, the background environment is a driving environment of a road without illumination at night.
The angle is the angle between the main optical axis of the headlamp and the sight of a driver; the longitudinal distance (longitudinal distance) is the linear distance between the headlamp and the driver along the direction of the main optical axis, and the cross section where the longitudinal distance is located is a longitudinal distance section; on the same longitudinal section, the distance moving in the horizontal direction from the point of maximum light intensity is the transverse distance (transverse distance); in the same longitudinal section, the distance from the point where the light intensity is maximum to move in the vertical direction is the vertical distance (vertical distance).
In the third step, the angle value between the headlamp and the sight line of the driver is that the headlamp rotates upwards for 2-8 degrees, rotates downwards for 2-8 degrees and rotates leftwards for 3-12 degrees.
The physiological stress response of the driver affected by the glare in the fourth step refers to the ability of the eyes of the driver to reduce or lose the observation target and detail when the driver is affected by the glare.
The maximum light intensity point is the point position of eyes when the influence of glare on a driver on a longitudinal section is strongest;
the "disturbance-tolerance" reference point is the position of the cross-point of the disturbance glare and the tolerance glare rating on the reference line.
And fifthly, the disabling-interference reference point and the interference-tolerance reference point are the visual perception junction points of disabling glare and interference glare and tolerance glare on the reference line.
The area contained within the "interference-tolerance" glare rating borderline in step five 6) is the area of influence of interference glare.
In the step six, the interference-tolerance glare plane influence area adopts 85% accumulated glare influence which can be accepted by a driver at the point as a reference point, and the glare plane influence area of the longitudinal section is found out by taking the reference point as a basis;
the glare three-dimensional influence area is an area where the safety visual recognition requirement of the driver is influenced by the glare of the vehicle headlamp when the sight of the driver is in the three-dimensional area.
Compared with the prior art, the invention has the following obvious advantages and beneficial effects:
the invention relates to a method for measuring and calculating a traffic safety glare threshold value of a vehicle headlamp, which determines main influence factors of the traffic safety glare of the headlamp by analyzing a generation mechanism of the glare of a driver caused by a light source of the vehicle headlamp on an unlighted road at night; based on psychological stress reaction of a driver when the driver is affected by glare, a glare rating scale suitable for safe visual recognition of the head lamps of the opposite vehicle is provided. The influence degree of the glare of the headlamp on the vertical illumination representation of the human eye position of the driver is measured by combining the characteristics of the light source, the relative position of the headlamp and the sight of the driver and background environment factors and utilizing the driving safety visual recognition requirement of the driver. By processing and analyzing a large amount of sample data, the three-dimensional glare influence area and the glare threshold under different relative positions are obtained.
The glare three-dimensional influence area determines the area where the safety visual recognition requirements of the driver are influenced by the glare of the vehicle headlamp, so that the glare threshold value is accurately given, and a good basis is provided for the road anti-glare facility.
Drawings
Further objects, features and advantages of the present invention will become apparent from the following description of embodiments of the invention, with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of a preferred embodiment of a method for measuring glare in head light traffic safety according to the present invention;
FIG. 2 is a schematic diagram of a relative spectral power distribution of a headlamp;
FIG. 3 is a schematic view of an illuminance curve for a headlamp;
FIG. 4 is a schematic view of a small visual target;
FIG. 5 is a schematic view of different longitudinal sections;
FIG. 6 is a schematic view of a longitudinal section
FIG. 7 is a schematic view of a horizontal 10m glare plane affected zone;
FIG. 8 is a schematic view of the upper 4 ° 7m glare plane affected zone;
FIG. 9 is a schematic view of a horizontal angle glare three-dimensional affected zone;
Detailed Description
In order to make the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a flowchart of a preferred embodiment of the method for measuring and calculating the traffic safety glare of the headlamp, which combines the characteristics of the light source of the headlamp, the relative position of the headlamp and the sight line of the driver, and the background environmental factors, utilizes the safety visual recognition requirement of the driver, and represents the degree of influence of the traffic safety glare of the headlamp by the vertical illuminance at the position of the human eye of the driver, and completes the establishment of a glare threshold measuring and calculating system by adopting the following steps:
the method comprises the following steps: and configuring a background environment, wherein the background environment is a driving environment of a road without illumination at night.
When a vehicle runs on a road without illumination at night, a driver only depends on the light beams of the headlamps to observe the road condition and the linear trend in front, and the light sources of the headlamps form extremely strong brightness contrast with the dark environment at night, so that the glare of the headlamps of the vehicle is frequently emitted.
Step two: and measuring light source characteristic data of the vehicle headlamp, wherein the light source characteristic data of the headlamp comprise a color temperature, a maximum light intensity, a luminous flux, a relative spectral power distribution and an equal illumination curve. The characteristics of the light source such as brightness, color temperature and spectrum determine the degree of influence of the glare on human eyes, the generation of the glare is mostly due to the brightness of the light source, the larger the surface area of the light source is, the larger the brightness of the light source is, and the stronger the glare is; the luminous efficiency function of the blue cone cells has a clear linear correlation with the level of discomfort glare, the higher the color temperature, the more the blue light, the more uncomfortable feeling is easily generated for the observer, and the relative spectral power distribution diagram and the isolux curve are shown in fig. 2 and fig. 3.
Step three: and setting relative positions of the headlamp and the sight line of the driver, including the angle, the longitudinal distance, the transverse distance and the vertical distance between the main optical axis of the headlamp and the sight line of the driver. Along with the change of the line shape, the included angle between the sight line of the human eyes and the main optical axis of the glare source is changed; the difference in distance results in a difference in brightness of the light beams entering the human eye; the visual line height of the driver, the installation height of the vehicle lamp and the lane where the vehicle lamp is located also influence the visual recognition of the driver, and the visual recognition is a physical quantity reflecting the relative position of the glare source and the eyes. The closer the light source is to the eyes, the smaller the included angle between the main optical axis and the sight line is, and the stronger the glare is. By changing the relative position, the condition of the vehicle in a special linear road section such as a flat curve, a straight line, a concave vertical curve, a convex vertical curve and a flat-longitudinal combined road section is simulated, and the influence of the relative position and angle factors on the glare is analyzed.
The angle values of the headlamp and the driver sight line are that the headlamp rotates upwards by 2 degrees, 4 degrees, 6 degrees and 8 degrees, rotates downwards by 2 degrees, 4 degrees, 6 degrees and 8 degrees, and rotates leftwards by 3 degrees, 6 degrees, 9 degrees and 12 degrees; the longitudinal distance values are 3m, 5m, 7m, 10m, 12m, 15m, 30m, 50m, 70m, 100m and 120 m.
Step four: setting a safety vision-recognition glare rating scale to avoid glare being a necessary condition for meeting safety vision-recognition driving of a driver, and generating physiological stress reaction when glare is stimulated to reduce or lose the capability of observing targets and details of the driver; the glare is divided into two grades by combining the difference of individuals in the visual recognition experiment and the understanding of the meaning of the glare: glare rating 1-interference glare, glare rating 2-tolerance glare.
A small target object is placed on the road surface 110m right in front of the driver visual recognition position, the visual recognition target object is a gray cube (with low contrast) recommended by the international lighting association, and the gray cube is 20cm by 20cm, the surface reflection coefficient is 0.2, and the color of the visual recognition target object is close to that of the background road surface, as shown in fig. 4.
TABLE 1 Glare rating scale for safety
Step five: the driver target object visually recognizes and measures the vertical illumination at the eye position of the driver. The angle between the headlight and the driver is changed, and the visual recognition is performed on the sections with different longitudinal distances, and the visual recognition longitudinal distance section is shown in fig. 5. And finding the influence area of the interference glare by visual recognition at different transverse distances and vertical distances of the same longitudinal distance section. The area of influence is the area contained within the "interference-tolerant" boundary, which is formed by the demarcation point and the reference point, where the "interference-tolerant" reference point is the point with the largest distance on the boundary and the vertical distance of this point is also the vertical distance of the point with the largest light intensity, and a vertical cross-section is seen as shown in fig. 6 below. The farther the same section is from the main optical axis, the slower the illumination decreases, as can be seen from the equal illumination curve. In order to avoid that the illumination change of the section with a long longitudinal distance is small, so that the influence precision of the overlarge difference of the visual recognition of the driver is caused, after the position of a transverse interference-tolerance reference point and the illumination information are determined, the positions of other points on a boundary line are searched through the vicinity of an equal illumination curve where the reference point is located, and the visual recognition feeling is adjusted and confirmed by the driver at the position.
The step of visually recognizing comprises: 1) adjusting the central line of the headlamp to a horizontal position, and enabling the light beam to naturally fall; 2) the driver was acclimated for 10 minutes in the background environment; 3) selecting a longitudinal section, enabling a driver to directly look at a front sight line to move up and down under the longitudinal section, finding and recording the height with the strongest glare, wherein a horizontal line where the height is located is a datum line; 4) the driver moves right at the height of the datum line, and the moving distance is recorded as the transverse distance; determining a demarcation point of a glare grade 1 and a glare grade 2 according to a safety visual recognition glare grade scale, recording the demarcation point as an interference-tolerance datum point, and measuring and recording the vertical illumination data of the human eye position of the demarcation point; 5) according to the transverse distance of the 'interference-tolerance' reference point, determining an equal illumination curve of the reference point on the longitudinal distance section; 6) the driver determines the positions of all points at the interference-tolerance glare grade near the equal illumination curve, measures and records the vertical illumination data at the positions of the eyes of all points, and connects all points to obtain an interference-tolerance glare grade boundary line; 7) resetting the longitudinal section and repeating the steps from 3) to 6); 8) resetting the relative position and repeating the steps from 3) to 7);
step six: obtaining a glare threshold value; processing and analyzing the collected visual recognition data, taking the glare influence of the point which can be accepted by 85% of accumulated drivers as an 'interference-tolerance' reference point, and obtaining an 'interference-tolerance' glare plane influence area of each longitudinal section by taking the reference point as a basis, as shown in fig. 7 and 8; obtaining a standard interference-allowable glare grade boundary of a 10m longitudinal section by processing data of glare plane influence areas of different longitudinal sections, and calculating a glare boundary of 1m to 120m at a horizontal angle according to the boundary to obtain a glare three-dimensional influence area; obtaining three-dimensional influence areas of the glare under different relative positions by using the same data processing method;
and processing and analyzing the measured illumination data, and obtaining the glare thresholds of the sections with different longitudinal distances according to the square inverse theorem of the illumination and the linear relation with the light intensity at the light source.
TABLE 2 horizontal angle glare threshold
TABLE 3 Glare threshold values for different angles of 5m longitudinal section
By the method of the embodiment, the relationship between the glare influence degree and the relative position, the light source characteristics of the headlamp and the background environment is established, the three-dimensional influence area of the glare and the glare threshold are obtained by processing and analyzing the visual recognition data and the illumination data, and the guiding standard which effectively and reasonably meets the requirements of drivers on safety and comfort visual recognition is provided for the setting method of the anti-glare facilities on the expressway.
Claims (8)
1. A method for measuring and calculating a traffic safety glare threshold of a vehicle headlamp is characterized by comprising the following steps:
the method comprises the following steps: configuring a background environment;
the background environment is a driving environment of a road without illumination at night;
step two: measuring light source characteristic data of a vehicle headlamp;
the characteristic data of the headlamp light source comprises a color temperature curve, a maximum light intensity curve and an equal illumination curve;
step three: setting relative positions of the headlamp and the sight of a driver;
adjusting the relative position of the headlamp and a driver to obtain the running conditions of the vehicle on various linear road sections of a concave vertical curve, a convex vertical curve, a flat curve, a straight line and a flat longitudinal combined line shape, and analyzing the influence of relative position and angle factors on glare;
the relative position of the headlamp and the driver comprises the angle, the longitudinal distance, the transverse distance and the vertical distance between the headlamp and the sight line of the driver;
step four: setting a safe visual perception glare grade scale;
the physiological stress reaction generated by different influence degrees of the glare is considered in a safe vision mode in the driving process of a driver, and the glare is divided into two grades: glare rating 1-interference glare, glare rating 2-allowable glare;
step five: the target object of the driver visually recognizes and measures the vertical illumination of the eye position of the driver;
placing a small target object on a road surface 110m right ahead of the driver visual recognition position, and carrying out visual recognition on the target object to obtain a light intensity maximum point, a reference line and an interference-allowable reference point, wherein the visual recognition step comprises the following steps of:
1) adjusting the central line of the headlamp to a horizontal position, and enabling the light beam to naturally fall;
2) the driver adapts for more than 10 minutes in the background environment;
3) selecting a longitudinal section, enabling a driver to directly look at a front sight line to move up and down under the longitudinal section, finding and recording the height with the strongest glare, wherein a horizontal line where the height is located is a datum line;
4) the driver moves right at the height of the datum line, and the moving distance is recorded as the transverse distance; determining a demarcation point of a glare grade 1 and a glare grade 2 according to a safety visual recognition glare grade scale, recording the demarcation point as an interference-allowable reference point, and measuring and recording vertical illumination data at the position of the human eye at the interference-allowable reference point;
5) according to the transverse distance of the interference-allowable reference point, determining an equal illumination curve of the reference point on the longitudinal section;
6) the method comprises the following steps that a driver determines the positions of various points with interference-allowable glare grades in a range of 0-30 cm near the various points on an equal illumination curve, measures and records vertical illumination data of the positions of human eyes of the various points, and connects the various points to obtain an interference-allowable glare grade boundary line;
7) resetting the longitudinal section and repeating the steps from 3) to 6);
8) resetting the relative position and repeating the steps from 3) to 7);
step six: obtaining a glare threshold value;
processing and analyzing the acquired visual recognition data under the interference-allowable glare grade to obtain the interference-allowable glare plane influence area of each longitudinal section; obtaining a three-dimensional glare influence area at a relative position by processing data of glare plane influence areas of different longitudinal sections; obtaining three-dimensional influence areas of the glare under different relative positions by using the same data processing method;
and processing and analyzing the illuminance data of the interference-allowable glare grade boundary line obtained by measurement to obtain glare thresholds of sections of the vehicle headlamp with different longitudinal distances.
2. The method for calculating the traffic safety glare threshold of the vehicle headlamp according to claim 1, wherein the method comprises the following steps:
the angle is the angle between the main optical axis of the headlamp and the sight of a driver; the longitudinal distance is a straight line distance between the headlamp and a driver along the direction of a main optical axis, and the cross section where the longitudinal distance is located is a longitudinal distance cross section; the distance of the same longitudinal section moving along the horizontal direction from the point with the maximum light intensity is the transverse distance; and the distance of the same longitudinal distance section moving from the maximum light intensity point along the vertical direction is the vertical distance.
3. The method for calculating the traffic safety glare threshold of the vehicle headlamp according to claim 1, wherein the method comprises the following steps:
in the third step, the angle value between the headlamp and the sight line of the driver is that the headlamp rotates upwards for 2-8 degrees, rotates downwards for 2-8 degrees and rotates leftwards for 3-12 degrees.
4. The method for calculating the traffic safety glare threshold of the vehicle headlamp according to claim 1, wherein the method comprises the following steps:
the physiological stress response of the driver affected by the glare in the fourth step refers to the ability of the eyes of the driver to reduce or lose the observation target and detail when the driver is affected by the glare.
5. The method for calculating the traffic safety glare threshold of the vehicle headlamp according to claim 1, wherein the method comprises the following steps:
and fifthly, the small target is a gray cube with the surface reflection coefficient of 0.2 and the side length of 20 cm.
6. The method for calculating the traffic safety glare threshold of the vehicle headlamp according to claim 1, wherein the method comprises the following steps:
the maximum light intensity point is the point position of eyes when the influence of glare on a driver on a longitudinal section is strongest;
the disturbance-allowable reference point is a position of a boundary point between disturbance glare and allowable glare levels on a reference line.
7. The method for calculating the traffic safety glare threshold of the vehicle headlamp according to claim 1, wherein the method comprises the following steps:
the area contained within the interference-allowed glare rating boundary in step five 6) is the area of influence of interference glare.
8. The method for calculating the traffic safety glare threshold of the vehicle headlamp according to claim 1, wherein the method comprises the following steps:
in the sixth step, the interference-allowable glare plane influence area adopts 85% accumulated points which can be influenced by glare of a driver as reference points, and the glare plane influence area corresponding to the longitudinal section is found out by taking the reference points as the basis;
the glare three-dimensional influence area refers to an area where a driver's safety visual recognition requirement is influenced by glare of a vehicle headlamp when the driver's sight is within the three-dimensional area.
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