In the middle of the night, you must definitely drive to car headlights. From a height, it must be a beautiful scenic line. But it's basically for the sake of car safety. After all, we have poor eyesight at night. And car headlights, where riders can see riders. Do friends know how to adjust the led high beam of a car? Today, let's briefly introduce our friends.
How to adjust the automobile led high beam: Description of led headlight spotlight adjustment
The traditional halogen & has good light concentration because the tungsten filament lights up and the light comes from a central point, which we call & Ldquo point light source & Through the refraction of the lamp bowl, the point light sources converge to shine forward and spread evenly on the road surface, which ensures that we have enough forward-looking brightness.
however, many led headlamps have serious astigmatism, non-focusing and other problems due to their own design reasons or various factors during modification. Many people have heard that led headlights are out of focus, and the first idea is to add a lens, because the lens has strong focusing ability. But in fact, lens LED headlights are not the requirement for vehicles to meet objective conditions. On the one hand, not all models basically have enough spare rooms to install lenses, especially if there is no lens in the optional configuration of the original car, which is very troublesome to install. In addition, disassembling the lampshade and bumper to install the lens will make the sealing performance of headlights worse, and it is difficult to prevent problems such as water ingress and fogging in rainy days.
I believe that many friends have basically tried to adjust the lighting through the adjustment knob behind the headlights, but it sounds very simple, and the actual operation has been tossing for a long time, and it is very likely that the effect is not as good as before. But here, in order to satisfy some hands-on friends, here are the instructions for adjusting the angle of the headlights:
First, park the car 7.6 meters away from the wall, then turn on the lights, and then we will adjust the position of the lights according to the position of the lights on the wall. Headlight height adjustment knob is integrated in single-point vehicle. If your car has this function, you should set the headlight height adjustment knob to&; ldquo& Rdquo a little
In order to set these standard lines on the wall, we need to measure three distances from the position of car headlights in advance. Distance A is the distance from the low beam center to the central axis of the car; B is the distance from the center of the high beam to the central axis of the car; Distance c is the distance from the center of the low beam to the ground.
adjusting the light position is achieved by adjusting the adjusting knob at the corresponding position behind the headlight. Depending on the specific model, the position to be adjusted and the tools used by different models are also different. Before adjustment, hit the lamp on the wall first, and then observe whether the lamp is offset, too high or too low.
If you think it is so difficult, a fairly simple way to judge is to let a person with a height of 18cm stand 7.6m in front of the car, and then the near light contact should not be higher than the person's hips. If it is too high, turn the adjusting knob to adjust.
it's a little difficult to adjust the lights yourself. Friends can tell the mechanic to adjust and test the lights during the car maintenance.
how to adjust the LED high beam: advantages and disadvantages of led car lights
advantages
1. energy saving: LEDs directly convert electric energy into light energy. Compared with ordinary automobile light bulbs, the power consumption is only 1/1 of that of traditional lamps, which can better save oil consumption and ensure that automobile circuits will not be burned out by excessive load current.
second, environmental protection: there are no ultraviolet rays and infrared rays in the spectrum, with low calorific value, no radiation, small glare, recyclable waste, no pollution, no mercury element and safe touch. It is a typical green led light source.
third, long service life: there are no lifting parts in the lamp body, and there are no defects such as easy burning, thermal deposition and light decay of the filament. Under proper current and voltage, the service life can reach 8,-1, hours, which is more than 1 times longer than that of traditional light sources. (It has the characteristics of one-time replacement and lifetime use)
Fourth, it has high brightness and high temperature resistance. (Electric energy can be directly converted into light energy, with low calorific value, so it can be touched by hand without worrying about safety)
Fifth, it is small in size. Designers can change the lighting mode at will, so as to diversify the car shape. Automobile manufacturers favor LED, which is completely determined by the advantages of LED itself.
6. the led has good stability and strong seismic performance: it is encapsulated by resin, which is not easy to crack and is convenient for storage and transportation.
VII. High luminous purity, clear and bright color, no need for lampshade filtering, and light wave error within 1nm.
8. The reaction speed is fast, and it can emit light in a few microseconds without hot start time, while the traditional glass bulb has a delay of .3 seconds, which can avoid rear-end collision and ensure safe driving.
Disadvantages
First of all, LED lamps are more expensive than ordinary lamps. (Now, with the continuous application of LED in the whole country, the price will further drop.)
Second, car headlights is difficult in the whole country, with poor heat dissipation and poor heat dissipation treatment, and it is easy to lose light, which is related to the service life of lamps.
thirdly, there is no industry standard, and the product quality is uneven. There is a phenomenon that the production price of different LEDs of the same product is 1-2 times different.
application obstacles
1. Compared with incandescent bulbs, the cost of using light-emitting diodes is very high. Depending on the quantity and quality of LEDs used, the price is mostly several to ten times that of similar incandescent bulbs. Although high-power LED has existed for a long time, its cost is also proportional to its power. The reduction of global automobile LED production cost will be one of the key factors related to the large-scale application of automobile LED in the future.
2. because the end consumers have higher and higher requirements for the appearance of the car lamp, and with the increasing number of LEDs used in the car lamp, the probability of LED being suspected is increasing, so the performance reliability of LED products is also higher and higher. At the same time, vehicle manufacturers have higher and higher requirements for LED suppliers.
3. With the increasing scale of automobile LED market, more and more new suppliers are bound to join, and the competition is becoming more and more fierce. However, the uneven quality of suppliers' products will inevitably affect the market reputation, and then affect the final consumer demand. As long as the cost of LED is reduced to the same level as incandescent lamps, all cars except economical cars will basically use LED on a large scale.
how to adjust the automobile LED high beam: adjustment method
1. current adjustment
one of the basic problems of led is that it is a current adjustment device with low voltage drop. The simplest method is to limit the current of LED with resistor, but this method is not suitable for 12V or 24V battery system, because the actual voltage of battery is from 6V to 18V or 12V to 36V. Therefore, in order to maintain brightness, it is necessary to adjust the constant current.
2. Linear regulation of current
Linear regulation means that the current through the LED is kept constant through the linear regulator. The efficiency of linear regulation is very low in some conditions, such as a single 1A(3W)LED with a DC voltage of 3.5V. The rated 12V power supply of the regulator will be reduced to 8.5V while maintaining 1A current, so using 3WLED will waste 8.5W power. Linear current regulation is the least noisy technology, and it is the safest from EMC's point of view.
3. Switching mode
Although the constant current technology of inductive switch will produce more electronic noise, it is more efficient. Depending on the number of LEDs used, buck or buck/boost regulators can be used.
4.EMC problem
Radiation noise and conduction noise must be minimized, and the noise should be adjusted within the allowable range. Although the frequency of PWM method is fixed, and it is easier to filter, because the LED load is relatively stable, if appropriate measures are taken, hysteresis regulator and PFM are suitable choices. The development trend of switching regulators is that the frequency will be higher to shorten the volume of inductor/capacitor. For automotive applications, this is always the best way to eliminate it. Keeping the frequency low helps to prevent interference doubts.
& Ldquo fundamental frequency; Tremble. Or & Ldquo expansion &; Rdquo technology is indeed beneficial to meet the requirements of similar peak EMC test, but the best way is not to cause any radiation, which is difficult for any switching regulator to achieve.
radiant heat, conduction heat and thermal management. One of the key problems and biggest challenges that users (especially automobile manufacturers) who use high-brightness LEDs need to face is the self-heating problem of LEDs. The lumen per watt of LED has been greatly improved, but in fact, most of the electric energy of LED is converted into conductive heat. LED can cause less radiant heat suitable for automobile lighting, but in cold climate, the radiant heat of headlights can effectively melt the snow on the lens. Therefore, thermal management is the key to reliable adjustment of LED.
hotkeys mean that the current becomes shorter when the temperature is increased. The advantage of using high brightness LED is that when the current changes greatly, the eyes can't detect the brightness change. In most cases, the current is reduced by 25%, and the brightness change of a single LED is not obvious.
but the LED will change color with the change of temperature and current. Whether this will affect the application of automobile lighting remains to be discussed. Whether the LED spectrum meets the objective requirements of lighting and whether it will affect the driver's sense of distance under most night vision effects may be more important.
using PWM method to reduce brightness ratio instead of DC adjustment can get a larger brightness ratio, and the color temperature will not change, so using PWM method to reduce brightness is a better method. However, the choice of frequency is also very important. Most people think that the frequency of 2Hz is good, because the human eye will not feel the flicker of 2Hz light, and the lower frequency can be guaranteed to be lower than the switching frequency of the switching regulator. However, it is necessary to foresee the potential doubt that headlights have stroboscopic effect. A more suitable method is to use higher frequency to adjust the brightness of LED, which will prevent &: Ldquo prejudice. Effect. In addition, the sensors must be carefully selected to prevent the sound noise in the car.
the temperature sensing of p>LED is also a problem to be solved. Thermistors are widely used, but we must be very careful when using thermistors, and the temperature adjustment response should be set to the upper temperature limit corresponding to the current to be shortened by led. When the ambient temperature drops, simple temperature adjustment will affect the current addition of LED. Figure 2 shows the typical response requirements of light emitting diodes to ambient temperature.
after reading the brief introduction of the car series, do you have a necessary understanding of how to adjust the led high beam of the car? So, do your friends like the knowledge that Bian Xiao Auto introduced to your friends today? Che Bianxiao believes that these content knowledge partners must have a good understanding, which is basically a problem for us. Finally, I hope that the introduction of the car system can solve the problem for friends.
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