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Not long ago, at the Geneva Motor Show, the third generation Audi TTuupue introduced LED headlamps to officially meet with the media. The exquisite LED headlights replaced the original xenon lamp assembly and became a highlight of the auto show.
The year-old flowers are similar, and the years-old cars are different. The development of automotive industry technology is changing with each passing day, and new technologies are constantly replacing old technologies. The direction of the development of the automotive industry is slowly moving towards smart and green. This is also the case with the development of automotive light source technology. In the auto show in recent years, we can see that some models are equipped with a variety of colorful LED lights, which attract the attention of consumers.
LED lighting to create green lighting safety and energy saving is an eternal topic in the development of the automotive industry, and is also the core of modern automotive technology development.
The light signal is the language of the car, and the timely and sensitive light signal is an indispensable guarantee for safe driving. However, due to poor line of sight at night driving, the driver's judgment on the front of the vehicle will decrease, and the lack of light or excessive light will easily cause a traffic accident. According to the statistics of the National Highway Traffic Safety Bureau, although the night driving time only accounts for 1/4 of the total driving time, the proportion of deaths caused by traffic accidents accounts for 1/2. In addition, the statistics of world automobile safety accidents It shows that the number of car traffic accidents in the world is more than 10 million per year, including about 500,000 deaths. The traffic accidents that occur at night are three times that of the daytime, and the accident rate when lighting conditions are poor is three times that of good lighting. Because the LED lights are fast, they can reflect the condition of the car and the road in real time, leaving the driver with a longer judgment time. According to the measured speed of 100 kilometers, the rear car can shorten the braking distance by 7.5 meters. Effective prevention of rear-end collisions and reduction of vehicle safety accidents are of positive significance for improving the active safety of automobiles. Industry experts said. In addition, LEDs are controllable, such as light type, illumination range, and brightness, which can be linearly adjusted, while conventional xenon lamps are not. In recent years, LED technology has been continuously developed, technical shortcomings have been overcome, and LED lights have become more and more intelligent. For example, some models of LED headlights are equipped with a contra-directional vehicle detection radar and a control computer. Even if the driver turns on the high beam, the opposite vehicle will automatically light down the light and even reduce the brightness.
Energy saving and environmental protection is another significant advantage of LED lights. According to the Ministry of Industry and Information Technology, as of the end of 2015, automotive lighting needs to meet the carbon dioxide emission reduction targets. Since the LED lamp is a cold light source, it has the advantages of low power consumption and long life, and consumes only 1/10 of the power of the conventional lamp, which can save fuel consumption. It is reported that if the daily energy-saving lamps are used, the energy-saving lamps can save energy by 4/5 compared with incandescent lamps, and the LEDs can save energy by 1/4. In the cars, the same daytime running lights, the energy consumption of LED components Only 1/20 of the halogen lamp.
In addition, LED lights have high brightness, high temperature resistance, small size, high stability, no radiation and other advantages, is recognized as green lighting. In the future, LEDs will be favored by more auto manufacturers, and will be more widely used in automotive applications. The LED automotive lighting market is promising.
The complete replacement of the LED lighting market is also divided into internal lighting applications and external lighting applications. In automotive interior light applications, due to the rich color of LEDs, it is currently widely used, such as instrument panels. At present, there are very few cars with small light bulbs on the dashboard. In the next few years, all the vehicle dashboards should use LEDs. A technician from the product dimension lights said that in addition to the instrument panel, common LED interior lights include ceiling lights, instrument lights, door lights, reading lights, Step lights, etc.
Common external lights include headlights, brake lights, fog lights, backup lights, turn signals and daytime running lights. At present, brake lights, tail lights, turn signals, reversing lights, high-position brake lights, etc. have already applied LEDs. For headlamps, because of the important role of safe driving, the requirements for light distribution are relatively high, plus Cost constraints and heat dissipation issues, LED as the main source of illumination for the front of the car is still immature. China's auto industry has few independent brands, most of which are medium and low-end cars. There are not many LED lights. At present, only high-position brake lights and side turn signals use LED light sources. In addition, because of the problem of illumination distance and brightness, LEDs are rarely used for heads. Lighting. The technician told reporters that the current configuration of LED headlights is mainly concentrated on a few high-end models, such as Audi R8 and A8, Mercedes-Benz CLS, BMW X6M and the new BMW 7 Series. Affected by high costs, LEDs will not be able to completely replace halogen and xenon lamps in the next three to five years. Looking back on the history of the past, the halogen lamp has matured for nearly 20 years. From the advantages of LED lights, the future LED lights will inevitably become the trend of the development of lights, but it will take a period of transition. Ni Wei, regional manager of Philips (China) Investment Co., Ltd., said that with the continuous decline in LED costs and the simultaneous improvement of technology, the trend of application of external lights has also increased in recent years.
LED lights are the new favorite of future car lights. In February 2011, the EU required all new cars and small trucks to be equipped with daytime running lights. In addition to the EU, other countries have begun to regulate the new cars of all types of vehicles to install daytime running lights. Relevant policies of various countries have been introduced to accelerate the popularization of LED lights. Industry experts say that daytime running lights must maintain brightness while the vehicle is in motion. Because LED light source has the advantages of low energy consumption and long life, considering the trend of driving safety and energy saving demand, it is an inevitable trend for manufacturers to develop LED daytime running lights.
Zhou Lihui, an associate professor in the Department of Automotive Engineering at Tsinghua University, believes that LED components have the huge advantages of small size, compact and easy layout and design, which leaves automakers with a broad space in the design of automobile shapes, breaking the shackles of the past lighting systems. To meet the needs of the appearance of the car, China's own brands have a great interest in this aspect, which also brings business opportunities to the domestic LED lamp industry. Future LED headlight technology will definitely become the trend of future lights.
In the future, the price of LED lights will decline steadily, and it will be more widely used in the automotive field. LED lights will become safer and more intelligent.
The history of the development of car lights The origin of car lights can be traced back to the end of the 19th century. In 1898, the Columbia electric car used electricity for the headlights and taillights, so that the electric lights were born. After more than a century of evolution, the lights have become an integral part of ensuring safe driving.
Looking at the development of the lights, it is not difficult to see that this is a miniature development history of science and technology. The first generation of car lights was incandescent. In 1913, incandescent bulbs came out. The working principle was that electric current passed through the tungsten wire, and the hot tungsten wire produced light radiation, which made the electric lamp emit bright light. Incandescent lamps brought the automotive lighting revolution. In 1925, electrical lighting was widely used in automobiles.
Turning over the page of incandescent lamps, we came to the era of halogen lamps for the second generation of lights. Halogen lights are actually a new generation of incandescent lamps. If the luminous efficiency of the incandescent lamp is to be increased, the temperature of the tungsten wire is increased, but the sublimation of the tungsten is caused, and the glass is condensed on the glass casing to make it black. The incandescent lamp is filled with a halogen element or a halide, and the blackening phenomenon of the bulb of the incandescent lamp can be eliminated by utilizing the principle of the tungsten halogen cycle. This is the reason for the halogen lamp, officially born in 1960. More traditional than incandescent lights, longer life and more energy efficient. Many car headlamps still use halogen lamps.
In 1991, the era of xenon headlights finally arrived. Xenon lamp, the English abbreviation is HID (High Intensity Dis-chargeLamp), that is, high-intensity gas discharge lamp. Xenon lamps are one of the high-efficiency light sources made by the discharge phenomenon of high-pressure, ultra-high pressure inert gas. It emits twice as much light as a normal halogen lamp, while consuming only 2/3 of its energy and 10 times the life of a conventional halogen lamp. Xenon lamps greatly increase the safety and comfort of driving, and help to ease the tension and fatigue of people driving at night.
After several generations of evolution, it has finally reached the LED light source technology that is now leading the trend of car lights. LED is the abbreviation of LightEmittingDiode, which was born in the 1960s. LEDs have many advantages. Because it is not a thermal illumination source, its service life can reach 5~10 years. In addition, it is rich in color, safe and environmentally friendly, resistant to vibration and impact, and has the advantages of small size and strong environmental adaptability. These characteristics are very attractive in the field of automotive lighting systems. It can be said that the LED light source is an ideal light source. Due to the high cost, technology and regulations, LED is still not mature as a car headlight.
After a century of development, the lights on the car have been used for lighting only from the very beginning, and now used in night vision, decoration and other purposes, I believe that in the near future, there will be more and more advantageous technologies to lead the car. The development of lighting.