Real hammer! The three-layer silver-plated glass affected the signal, Lei Jun kicked the iron plate, and Yu Chengdong became a prophet

Electricity technology

2024-07-02 18:40Electric Technology official account

Your front windshield will block cell phone signal!

No, no, you don't understand, try if you don't believe it.

This is another verbal battle between Yu Chengdong and Lei Jun some time ago.

Then, the user really tried it, and a fact surfaced - the navigation signal in the car of the Xiaomi SU7 Founding Edition is indeed inaccurate.

Xiaomi Auto has officially given two solutions to this. First, in the name of "navigation experience technology upgrade", the front windshield will be replaced free of charge; The second is to install a signal amplification receiver at ETC.

It has to be said that both methods are very hardcore.

The first one is simple and crude, glass can't work, right, then change a piece; The second is the ancient method of "adding noodles when there is more water, and adding water when there is more noodles". The signal is not strong, right, just add a receiver.

But no matter what the method is, it seems to have one thing in mind: the front windshield of the Xiaomi SU7 does affect the mobile phone signal in the car, and this is still a common phenomenon.

It is inevitable that a car will have problems of one kind or another, but the front windshield affects the signal, which is really new.

So, how did Xiaomi SU7 get into this matter?

Theoretically, it is common sense to add a layer of physical barrier to affect the signal.

Many people still remember that in the PHS era more than ten years ago, many people liked to run to the balcony when they were on the phone, and some people even held their mobile phones to the sky, just to avoid the barrier of the building and look for a better signal.

The same is true for cars, during driving, if you don't open the windows and sunroof, the car is a confined space, which can easily affect the mobile phone signal. However, with the continuous improvement of communication technology, the signal of mobile phones is also increasing, so in the era of smart phones, people in the car to make calls and navigator has been basically unaffected.

Why does the Xiaomi Mi SU7 have the problem that the front windshield affects the navigation signal? This is actually a new trouble caused by Lei Jun himself.

In the current new energy vehicle market, there is a more prominent problem, that is, the stuffy heat in the car in summer. In order to improve the appearance of the vehicle, many manufacturers have adopted a whole panoramic sunroof, but in order to save costs and do not want to install sunshades, most of them need users to purchase additionally, which directly leads to the passengers in the car entering the car like a pot.

In this regard, Tesla is a typical example, and there have long been memes of car owners sitting in the car with umbrellas and hats on the Internet, which is enough to show the universality of this problem.

When Xiaomi SU7 was designed, it wanted to seize this problem to make a wave of marketing, so it used three layers of silver-plated glass on the sunroof and front windshield. The surface of general automotive glass has more than a dozen layers of film, and three layers of silver-plated glass are silver-plated materials, which has the advantage of improving the thermal insulation effect of glass while maintaining lighting.

According to Lei Jun, this kind of glass can effectively block 99.5% of ultraviolet rays and 97.6% of infrared rays, which can not only transmit light, but also insulate heat, and solve the problems that have not been solved in the "140 years of automobile industry".

Common sense tells us that Xiaomi, as a small manufacturer who has just entered the industry, has a probability of solving a century-old problem approaching zero, because the automotive industry is very mature, and any corner has been studied countless times by engineers, and there will never be any "fish that slip through the net" on such a large piece as glass.

The answer is that other manufacturers do not use this kind of three-layer silver-plated glass, which does have its reason and empirical basis.

As early as April this year, Yu Chengdong publicly stated that the three-layer silver-plated glass scheme of Xiaomi SU7 will seriously affect the mobile phone model in the car. If it can affect the mobile phone signal, it can also affect the navigation signal; In the future, if components such as lidar are integrated into the windshield, it will also affect the radar signal.

In fact, just like the austenitic 304 stainless steel and semi-hidden door handles that Lei Jun used to vigorously promote, the three-layer silver-plated glass is not high-tech, and it is very common in some high-end buildings. In the construction industry, this kind of glass is generally referred to as Sanyin Low-E glass, and many high-rise office buildings use this kind of glass in the exterior walls.

Why doesn't the use of this glass on a building affect the signal? Because a building is not a confined space, its exterior walls, roofs, doors, vents, etc. can all allow signals to penetrate; However, if it is used in a car, it may be that the signal can only be guaranteed by opening the window, but in many cases, especially on highways, the windows and sunroof are not open.

The war of words between Yu Chengdong and Lei Jun broke out many times, but this time the dispute did not seem to attract much attention from the outside world, because this time Lei Jun can be said to have kicked the iron plate.

Yu Chengdong is a technical expert, and he single-handedly led the "Shengwireless" team in Huawei, and it can be said that most of his career has been dealing with signals.

You can argue with Yu Chengdong about AEB, but you should never argue about signaling. Just like Guo Degang's classic joke, you have to discuss with rocket experts whether the engine is bituminous coal or coking coal, but if the expert looks at you, he will lose.

Yu Chengdong, an expert, didn't lose, and he really didn't look at anyone else.

Three-layer silver-plated glass, Huawei, ZTE, Nokia and other major communication manufacturers should have been tested, it is really a very common material.

Yu Chengdong said that the three-layer silver-plated glass will affect the signal, and except for Lei Jun, probably no one will question it, because there is no point in arguing with communication technology experts about the signal.

But Xiaomi SU7 has taken "heat insulation" as a selling point from the beginning, and this thing can't be stopped, so Lei Jun can only forcibly match Yu Chengdong and try to tell everyone that his glass is fine.

However, the facts are always the facts, since the car friends have fed back this problem, then simply give up this thing in a small area, if the problem is really serious, the subsequent models may directly cancel this three-layer silver-plated glass.

Judging from the current situation, this incident has almost no impact on Yu Chengdong, at most, it has strengthened the label of "technical man" on his body and has become a far leading prophet. Anyway, Hongmeng Zhixing didn't use this kind of glass, Yu Chengdong said a few words casually, and this matter will pass.

For the Xiaomi SU7, it doesn't seem to have much of an impact.

If there is a problem with the glass, it can be replaced free of charge; As for how to solve the problem of heat insulation after changing,In fact, it's nothing,People who can spend more than 200,000 to buy XiaomiSU7,How much are they with a little affection in it,After some marketing,Fans may even feel that Xiaomi is very close to the people。

But this incident should still attract Xiaomi's attention.

Compared with Huawei's signal, Apple's application, Porsche's design, and BYD's battery life, Xiaomi still closes a little. Public opinion on the Internet is often reversed and reversed.

Xiaomi under the leadership of Lei Jun is very good at building momentum, and in many cases it even has the ability to reverse the situation. More than ten years ago, there were a lot of manufacturers who made mobile phones halfway, Xiaomi did not have any technical foundation, but it has survived until now, and even once rushed to the third place in global sales, and its strong marketing ability is obviously indispensable.

A few years ago, Xiaomi also argued with Huawei"How to pass through the wall of the router signal",Although the two companies are not at all the same volume in terms of technology accumulation,But after many rounds of war of words,Xiaomi has successfully made many people think that it is at the same level as Huawei,It can be called a classic case in the history of marketing。

But in the car circle, this set of gameplay is very dangerous, the mobile phone is dead and there is no signal, and it can be restarted; The car crashes and there is no signal at the critical moment will kill people, this is by no means alarmist, and when it comes, it will not be as simple as changing a piece of glass.

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