The vehicle's taillight system includes a variety of signal lights, such as turn signals, backup lights, brake lights, high-position brake lights, rear fog lights, etc., which provide very important information about driving behavior while the vehicle is driving. In order to increase the safety of the car on the road, whether in the day or night, the function signal of the taillight should be clearly identified, and glare should be avoided. Many studies have shown that taillights are more prone to glare at close range, such as when the vehicle is waiting for a red light or when the road is congested, so it is of great significance to study how the adaptive taillights are adjusted for light intensity.
Many advantages of LEDs make it widely used in automotive taillights, such as fast response (<1ms), high safety performance, long service life (greater than vehicle life), improved lighting system reliability, low power, small size It can reduce the size of the taillights of the vehicle and realize free optical design. The objects studied in this paper are LED taillights and adaptive taillights. Looking at the European standard regulations, we were able to find information about the range of luminous intensity allowed by the taillights, but we can't understand how the taillights are related to other signal lights, nor can we find provisions on the influence of other factors on the taillights, such as mentioned above. The effect of the distance on the taillight glare. At present, the basic direction of the research on adaptive taillights is to measure the current visibility conditions by sensors and adjust the intensity of the taillight signal function. In addition to the technical requirements, the most important is the perception of visual visibility. However, the current research lacks a unified and effective photometric standard for evaluating visibility. Therefore, this paper has conducted experimental research. In the distance between the two cars that are stationary on the outdoor test track, the subjects in the rear vehicle evaluated the light intensity of the front vehicle taillights by 1-9 points. The experiment set two variables: one is the light intensity of the front taillights, we set a total of five light intensity (3%, 11%, 28%, 57%, 100% of 173cd); the second is the distance between the two cars, We set 4 distances (5m, 20m, 50m, 100m).
A total of 22 subjects (5 males and 17 females) were shown in the experiment. The figure shows the scores of the subjects under different taillights. The lines of different colors indicate different vehicle spacing. The experiment found that the score of the tail light is not only related to the tail light, but also related to the distance between the vehicles.
A score of 5 in the rating scale indicates the most ideal light intensity, and 4 points and 6 points indicate a better light intensity. The figure shows the relationship between the actual tail light intensity and the vehicle distance when the tail light is in the optimal light intensity range at different distances. The minimum light intensity specified by the European standard is 60 cd. As can be seen from the table, especially when the distance in the car is small, the ideal tail light is strong within 60 cd.
From the above results, it can be concluded that an adaptive taillight system that automatically adjusts according to environmental conditions is very necessary. In the case of a small distance, such as a red light or a traffic jam, the luminous intensity of the taillight can be reduced to the minimum luminous intensity of 60 cd allowed by the regulations, thus ensuring the safety of the vehicle in the road and enabling the rear vehicle to clearly identify The signal of the taillights; at the same time, it ensures the visual comfort of the driver of the rear vehicle, and does not cause glare to affect normal driving. In addition, due to the reduction in light intensity, the energy consumption can be correspondingly reduced, and the calculation can reduce the light intensity by about 66%. This shows the significance and importance of this research. In further research, we hope to make a more accurate evaluation of the light intensity when both cars are in motion, and consider the actual weather and road conditions. Since the adaptive taillights hope to ensure the accurate transmission of the signal, and the increase of the light intensity is generally considered to be the reduction of the distance, it is a very far-reaching way to consider changing the function signal of the taillights such as the light intensity transmission brake. Practical application value.
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