How to adjust the automobile led high beam

When the car is in the middle of the night, be sure to turn on the headlights. Seen from a height, it must be a beautiful scenic line. But it is basically for the sake of car safety. After all, we have poor eyesight at night. There are headlights, and the rider can see the rider. 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: adjustment instructions of led headlight spotlight

The traditional halogen lamp has good light concentration because the tungsten filament lights up and emits light, and the light comes from a central point, which we call & ampLdquo point light source & through the refraction of the lamp bowl, the point light source converges forward and is evenly distributed on the road surface, which ensures that we have enough forward-looking brightness.

However, many led headlights have serious astigmatism and out-of-focus 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 a 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 space to install the lens, especially the optional configuration of the original car has no lens, which is very troublesome to install. In addition, removing the lampshade and bumper mounting lens will make the sealing performance of headlights worse, and it is difficult to prevent water ingress and fogging in rainy days.

I believe that many friends have basically tried to adjust the lights through the adjustment knob behind the headlights, but it sounds very simple. The actual operation has been tossed 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, the following are the instructions for adjusting the headlight angle:

First park the car 7.6 meters away from the wall, then turn on the light, and then we will adjust the position of the light according to its position on the wall. The headlight height adjustment knob is integrated in a single-point vehicle. If your car has this function, you should turn the headlight height adjustment knob to&; Ldquo0 & ampRdquo small amount

In order to set these standard lines on the wall, we need to measure three distances from 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.

Adjust the position of the lamp 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, and then observe whether the lamp is off-set, too high or too low.

If you find it so difficult, a fairly simple way to judge is to let a person with a height of 180cm stand 7.6 meters in front of the car, and then the near light contact should not be higher than this 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 the test lights when they are raising a car.

How to adjust led high beam: Advantages and disadvantages of LED lamp

superiority

1. Energy saving: Light-emitting diodes directly convert electric energy into light energy. Compared with ordinary automobile light bulbs, the power consumption is only110 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: no ultraviolet and infrared rays in the spectrum, low calorific value, no radiation, less glare, recyclable waste, no pollution, no mercury and safe touch. It is a typical green led light source.

3. 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 800-65438+ 10,000 hours, which is more than 10 times longer than the traditional light source. (It has the characteristics of one-time replacement and lifetime use)

Fourth, high brightness and high temperature resistance. (Electric energy is directly converted into light energy, and its calorific value is low, so you can touch it with your hands, so don't worry about safety. )

Fifth, the volume is small. 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.led has good stability and strong seismic performance: it is encapsulated by resin, which is not easy to crack and easy to store and transport.

Seven, the luminous purity is high, the color is clear and bright, there is no need for lampshade filtering, and the light wave error is within 10nm.

Eight, the reaction speed is fast, it does not need hot start time, and it can emit light in a few microseconds, while the traditional glass bulb has a delay of 0.3 seconds, which can avoid rear-end collision and ensure driving safety.

Disadvantaged

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, poor heat dissipation treatment, and easy to lose light, which is related to the service life of lamps.

Third, there is no industry standard and the product quality is uneven. There is a phenomenon that the production price difference of different LEDs of the same product is 1-2 times.

Application obstacle

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 directly proportional to its power. The reduction of global automobile LED production cost will be one of the key factors for 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 requirements for the performance and reliability of LED products are higher and higher. At the same time, vehicle manufacturers have higher and higher requirements for LED suppliers.

3. With the continuous expansion of the automotive 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 LED is a current regulating device with low voltage drop. The simplest method is to limit the current of LED with resistor, but this method is not suitable for the system of 12V or 24V battery, because the actual voltage of the battery is 6V to 18V or 12V to 36V. So in order to maintain brightness, it is necessary to adjust the constant current.

2. Current linear regulation

Linear regulation means that the current flowing through the LED is kept constant through the linear regulator. The efficiency of linear regulation is very low in some cases, such as a single 1A(3W)LED, the DC voltage is 3.5V, and the rated 12V power supply of the regulator will be reduced to 8.5V while maintaining the 1A current, so using 3WLED will waste 8.5W power. Linear current regulation is the least noisy technology and the safest from EMC's point of view.

3. Switch type

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 issues

Radiation noise and conduction noise must be minimized, and the noise should be adjusted within the allowable range. Although the frequency of PWM mode 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 this interference. Keeping the frequency low helps to prevent interference doubts.

& ampLdquo fundamental frequency; Tremble. Or & Expand &; 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 who use high-brightness led (especially automobile manufacturing) need to face is the self-heating problem of led. 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.

Hot keys mean that the current gets shorter when the temperature rises. The advantage of using high brightness LED is that when the current changes greatly, the eyes will not notice the brightness change. In most cases, the current is reduced by 25%, and the brightness change of a single LED is not obvious.

But 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 200Hz is good, because the human eye will not feel the flicker of 200Hz 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 appropriate method is to use a higher frequency to adjust the brightness of the LED, which will prevent "bias". Effect. In addition, the sensors must be carefully selected to prevent acoustic noise in the car.

The temperature sensing of 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 increase of LED. Figure 2 shows the typical response requirements of light emitting diodes to ambient temperature.

After reading the introduction of the automobile series, do you have a necessary understanding of how to adjust the led high beam of the automobile? 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 our problem. Finally, I hope that the introduction of automobile system can solve the problem for friends.

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