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 lights create "green lighting"
Safety and energy conservation are eternal topics in the development of the automotive industry and 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 the world's automobile safety accidents show that the number of car accidents per year in the world is more than 10 million, of which about 500,000 are dead. 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 LED lights are fast, they can reflect the condition of the car and the road conditions in real time, leaving the driver with a longer judgment time. According to the measured speed of 100 km, the rear car can shorten the braking distance by 7.5 m. Effectively prevent rear-end collision and reduce the car. Safety accidents have positive significance for improving the active safety of automobiles," said industry experts. 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 for analogy, the energy-saving lamps can save 4/5 more energy than the incandescent lamps, and the LEDs can save 1/4 more energy-saving lamps. In the car, the same daytime running lights, LED components consume 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.
Complete replacement also requires a transition period
The LED headlight market is divided into interior light applications and external light 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 that use small light bulbs in the dashboard. In the next few years, all the dashboards of the vehicles should use LEDs.†A technician of the product line said that in addition to the instrument panel, the common LED interior car The lamp also has a ceiling light, an instrument light, a door light, a reading light, a step light, and the like.
Common external lights include headlights, brake lights, fog lights, backup lights, turn signals and daytime running lights. At present, LEDs have been applied to brake lights, tail lights, turn signals, reversing lights, and high-position brake lights. For headlamps, because of the important role of safe driving, the requirements of light distribution are relatively high, coupled with cost constraints and heat dissipation, LED as the main lighting source of the front 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-level 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. Headlights are illuminated.†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. "Because of the high cost, LEDs will not be able to completely replace halogen and xenon lamps in the next 3 to 5 years. Looking back on the history of the development of lamps, halogen lamps have matured for nearly 20 years. From LED lights In terms of advantages, the future LED lights will inevitably become the trend of car lights development, but it will take some time to transition.†Ni Wei, regional manager of Philips (China) Investment Co., Ltd., said that as LED costs continue to decline and technology improves simultaneously, in recent years The trend in the application of external lights has also improved.
LED lights are the new favorite of future lights
In February 2011, the EU required all new models of cars and minivans 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 origins 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 the second generation of lights - halogen 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 raised, 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, English abbreviation is HID (High Intensity Dis-charge Lamp), 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, and consumes only 2/3 of its energy, and has a lifetime that is 10 times that of a normal 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. LEDs are short for Light Emitting Diodes, which were 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.
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