BMW i8 laser headlight system
The biggest point: the illumination reaches 170 lumens per watt, the length is only 10 microns, and the illumination distance is twice that of traditional LED.
The headlights of the i8 seem to be no different from the LED headlights, but in fact it uses an advanced laser headlight.
The headlight design of the BMW i8 is a highlight of the whole car. Not only is the slender shape very special, but more importantly, the technology behind it. This set of headlights is no longer the popular all-LED headlights, and it has already used more advanced laser headlights. As long as it is permitted by the laws of the country where it is allowed, the i8 can be equipped with this set of laser headlights. The vehicle uses a laser headlight).
The laser is brighter than the LED and the illumination distance is farther, but the size is smaller
From the appearance point of view, the i8's laser headlights seem to be not much different from the currently used full LED headlights, but technically, there is a huge performance gap between the two. Compared to LED technology, the biggest improvement of laser technology lies in its integration. It only has one-fifth of the LED volume, but it has 1000 times its brightness. The laser light of the BMW i8 is 170 lumens per watt, which is 70% brighter than conventional LEDs with 100 lumens per watt. The illumination distance is twice that of conventional LEDs. In terms of size, the laser's LED length is only 10 microns, which is one hundred times shorter than current small LEDs. This means that cars that use laser headlights don't have to leave a large area of ​​headlights like traditional cars, so designers can play more freely, so we see that the i8 has a more fascinating "double". The square design also echoes BMW's latest angel eye shape.
Comparison of the illumination distances of Xenon headlights, LED headlights and laser headlights from left to right
In addition to its extremely compact size and extremely high brightness, the laser source is also highly efficient and stable, requiring only half the energy consumption of today's LEDs, and this saves fuel consumption. The small headlights, lower energy consumption, and brighter features complement the energy-efficient i8 sports car.
No harm to the human eye, and in line with human visual habits
The performance of laser headlights is indeed very advantageous, but it is well known that lasers have great energy damage to the human eye due to their energy accumulation characteristics, but BMW's laser headlights do not have to worry about this. The reason is that BMW's laser headlights are not directly emitted by the laser beam toward the front of the vehicle. Instead, they are directed to a group of reflective lenses with three laser beams. After reflection, the laser energy will accumulate in a piece of yellow phosphorus (yellowphosphorus). In the lens, when the yellow phosphorus is excited by the laser, it will emit a strong white light. The white light will then shine on a reflector and finally emit a bright white light in front of the vehicle. The white light does not cause irritation or damage to the eyes of humans and animals, and the brightness and color temperature of the laser headlights have been studied, and the illumination effect conforms to the visual habits of the human eye. Finally, it should be pointed out that the laser headlights currently installed on the BMW i8 are not completely laser-based, because its low beam is still based on LEDs, only the high beam is laser. Light source foundation.
Laser headlight internal components
Of course, BMW's laser headlights are definitely not developed specifically for the i8 hybrid sports car. As early as 2011, BMW began to invest in the application of laser lights on civilian vehicles. The advantages of laser headlamps are very attractive. The energy-saving, small-sized, brighter light features soon have environmental and safety advantages, and designers can design headlamps compared to current headlamp designs. As for the front face design of today's vehicles, there can be a greater breakthrough. I believe that this laser headlight on the i8 is just the beginning. BMW will deploy this technology in other models in the future, and the BMW of the next heavy-duty laser headlight will be the new 7 series.
Mercedes-Benz new generation S-class intelligent LED headlights
The biggest point: composed of 56 LEDs, with active steering lighting, cornering auxiliary lighting, country roads, highways and dense fog mode
Each headlight assembly contains 56 LEDs that can be individually lit, extinguished, or adjusted for brightness.
Mercedes-Benz's new S-Class is equipped with intelligent LED headlights, which is a new enhanced adaptive high-beam headlight system. It has active steering lighting, cornering auxiliary lighting, country roads, highways and dense fog modes, and unique shading. The function can erase the light camouflage of the opposite or co-directional vehicle. The system will start automatically when the speed is more than 30 kilometers per hour and there is no street light on the road. The new S-class headlights use full LED headlights, and it also has more LEDs than the Audi A8 and BMW i8. Each headlight assembly contains up to 56 LEDs that can be illuminated separately. Turn off or adjust the brightness.
Light can automatically avoid the body of the opposite or the same direction
Unique shading to protect other drivers from light disturbances
In this headlight system, the front radar and stereo camera still play an important role. The LEDs in the headlights are illuminated, extinguished or adjusted according to their data to achieve the function of automatically adjusting the illumination range, even fine. To the outline. When an object appears in front of it, the light-shielding function of the S-class headlights can avoid the object in front, avoiding the dazzling effect on the other vehicle while ensuring their own line of sight. As can be seen from the official schematic, the S-Class can automatically avoid the other car when it encounters the opposite car, and the same action can be completed if the vehicle is traveling in the same direction, even before the car is bypassed. The vehicle profile can simultaneously illuminate the area to the left and right of the vehicle ahead. Therefore, driving at night, the S-class can always turn on the high beam, and the driving safety will be greatly improved. Not only that, but the system also detects reflective markers on the road to avoid glare to the driver of the vehicle.
Pedestrians who find that there may be risks will automatically flash the headlights
S-class smart headlights can automatically flash three times with the headlights identified in the front 160 meters.
The new S-Class Smart Headlight System not only provides the function of lighting, it also has the function of reminding pedestrians to pay attention to safety. With the detection function of the infrared night vision system, the S-class smart headlights can automatically flash the headlights with the headlights identified within 160 meters in front, prompting the other party to pay attention to safety, but not for the animals found to avoid Animals are frightened by the light and pose a potential hazard to the vehicle.
Audi changed A8/S8 matrix LED headlight light source technology
The biggest point: consists of 25 LEDs, each of which can be automatically turned on or off individually.
Since the Audi A8W12 top-level version first adopted LED headlights in 2004, Audi has already popularized many of its models with LED headlights. The A6, A7Sportback, and even the latest generation A3 are equipped with LED light sets. Having a pair of complicated and exquisite headlights has become a very distinctive feature of the Audi car. It is also said that domestic netizens nicknamed Audi as a lighting factory. It can be seen that Audi is a car manufacturer with a very high quality. Now, Audi has taken this technology to the next level and released their new matrix-based LED headlights technology (AudiMatrixLEDheadlights), which has been first introduced to the Audi A8/S8.
The lamp set of the matrix headlight is composed of several high-brightness LED units.
Audi's modified A8/S8 matrix LED headlights consist of 25 LEDs
The so-called matrix LED headlight source technology, it is not difficult to understand from the literal meaning that its lamp group is composed of several high-brightness LED units, and the system is arranged and combined with the lens and mirror in front of the lamp group to make the system Each LED unit can be controlled to adjust the illumination angle and range. In this way, the lamp set can achieve the effect of adjusting the illumination range without the need of a conventional mechanical rotating structure. As a result, engineers can more easily control the number of LEDs in each group, and the stylist's freedom can be made larger, thus designing more beautiful and unique lines and shapes for the group. Therefore, the A8 has a headlight lamp cavity design with artistic and technological effects.
When driving on the highway and the driver switches the headlights in the Automatic mode, the light-sensing automatic headlights and the matrix LED headlights will start at 30 km/h and the urban roads will be at the speed. Start at 60 km and use 25 high-intensity LED lights to give the driver a clear view of the road at night. In order to avoid high-brightness LED lights affecting the opposite car or the front vehicle in the high beam, the matrix LED headlights also work with several optical edge sensors, navigation systems and camera heads. When driving at night, the matrix LED headlights will generally use the high beam to illuminate the front. Once the system light source sensor detects that the emitted light beam hits the opposite or front vehicle, it will automatically adjust or turn off the number in the light group. One LED unit allows the vehicle ahead without being affected by the glare of high-brightness LEDs.
The high beam can automatically avoid the area where the other party is coming, so the high beam status can be maintained at all times.
Pre-illuminate the travel route with GPS
In addition, in order to allow the driver to clearly control the driving route at night, the matrix LED headlights of the A8/S8 are integrated with the satellite navigation system carried on the vehicle. When driving on a curved road, the matrix LED headlights can be navigated according to the navigation. System data, before the driver starts to turn the steering wheel and the vehicle enters the corner, adjust the illumination angle of the light source to illuminate the road surface for a safer and more relaxed night driving experience.
The light group can remind the driving
When a pedestrian in front is detected, several specific LEDs in the light group will automatically align with the pedestrian fast flashing 3 times.
In addition, if the modified A8/S8 is equipped with Night Vision Assist, when the system detects the pedestrian in front, several specific LEDs in the light group will automatically align with the pedestrian flash 3 To remind pedestrians to avoid danger and reduce the possibility of night accidents.
Audi Sportquattro Laserlight Concept concept car replaced high beam with laser headlights
It is worth mentioning that Audi is also developing its own laser headlight technology. The Sportquattro Laserlight Concept concept car, which will be released at CES, will replace the high beam with the same laser headlight as the BMW i8, and the low beam. Matrix LED technology is still used. Compared with the high-beam headlights of LED headlights, Audi's high-beam based on laser technology has the characteristics of longer illumination distance, which can illuminate up to 500 meters away, which is one time farther than the illumination distance of LED high beam. . At the same time, the brightness of the light is three times that of the LED light, which is undoubtedly very large for the further improvement of driving safety.
Summary: It can be found that the current stage of the lamp technology has been comprehensively involved in the upgrade of hardware and software. In terms of hardware, LEDs or lasers have not only become more energy efficient, have higher brightness, have longer illumination distances, and are more avant-garde in shape. On the software side, the light unit is combined with the electronic system to help the vehicle achieve better automation, which makes the driver more convenient and safer to use. In the next stage, automotive lighting technology is gradually becoming more popular in hardware, especially in terms of cost control, so that the latest technology can be applied to more different levels of models, while software will gradually adopt a full electronic system. Control, so that the light group can quickly provide the most suitable lighting at the moment according to the environment and dynamic response of the vehicle.
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