In China, Volkswagen has always been regarded as a god car. This is not only because of the skyward sales of Volkswagen cars. The two joint ventures SAIC Volkswagen and FAW Volkswagen have long occupied the top two in the sales ranking of joint venture car enterprises, but also because Volkswagen has too many fans in China. Their praise of Volkswagen’s car technology has reached a crazy level, which led to the birth of a large number of folk believers.
Speaking of Volkswagen technology, I believe that many people, like the author, think of the letters TSI and DSG at the first time. After all, many cash Volkswagen cars are equipped with technologies related to these letters. So are these technologies “God like” or are they blindly pursued by Chinese people and mythologized these technologies? Let’s talk. Let’s talk.
The real significance of laser welding
Laser welding has gradually entered the sight of Chinese consumers with the listing of Passat B5. It can be said that this technology has been used by the public all the time, but it is by no means only used by the public. When it comes to laser welding, Volkswagen officials always publicize that such welding method can improve the body strength. The author just wants to say that the improvement of body strength is good, but this does not mean that ordinary spot welding and other methods will not have a higher strength body. It mainly depends on the process level.
Many people will ask, since ordinary resistance spot welding can also meet the strength requirements of the body, why should the public insist on laser welding? The reason is really simple, for efficiency. The speed of laser welding is about tens of meters per minute, which can not be achieved by ordinary spot welding. Volkswagen sells 4 million cars in China a year. Laser welding will undoubtedly greatly save time and improve production efficiency. This is one of the means for Volkswagen to make high profits. For consumers, another advantage of laser welding is that there is no need to cover the weld joint with adhesive strips to cover the weld joint, which is why there are generally no adhesive strips on the roof of Volkswagen cars.
Cavity wax injection is not rust free
Cavity wax injection has always been one of the commonly used technologies in the public with laser welding. This technology is simply to inject special wax for rust prevention into the inner cavity of the car body, but it needs to be understood that cavity wax injection is not filling, but flowing. After the wax flows through the interior of the vehicle body, it will form a “protective film” to prevent the vehicle from rusting. As we all know, the exterior of the vehicle is generally visible and touchable, so we will prevent rust through daily maintenance, but if rust starts to spread from the inside, it will be really troublesome.
But seriously, I think cavity wax injection can not become a very “divine” process in the current market, because except for some shoddy domestic cars, the vast majority of enterprises use galvanized steel plates. Galvanized steel plate itself is a kind of plate with certain anti rust ability. Combined with the treatment of electrophoresis and gluing before painting, it is generally appropriate to adhere to it for more than ten years. The author does not deny the advantage of wax injection in the cavity of Volkswagen divine vehicle, but there is really no need to over myth. Besides, there are few people willing to drive Volkswagen for more than ten or twenty years. Because there are too many small problems, it is impossible to give up Volkswagen just for the sake of rust.
TSI + DSG is no big deal
Back to the letters we talked about at the beginning, I believe someone has never heard of laser welding and cavity wax injection, but I believe most people know TSI and DSG. Here, I won’t dwell on the meaning of these two letters. Interested friends can spend their mother on their own. As for TSI engine, I just want to say that it is actually a castrated model. In overseas, its full name should be TFSI, with more f, which represents that the overseas version has layered combustion technology.
TSI series engines have developed to the third generation. Its core technologies such as turbocharging, in cylinder direct injection and variable valve timing are now the mainstream. In technology, TSI does not have an absolute leading position. It can only be said that Volkswagen is constantly optimizing in the product renewal from generation to generation. But when this engine was first put on the market, there were many problems, among which the phenomenon of burning engine oil was very common. It was mythologized in China that it was really because of the belief of mass brain powder. From the perspective of performance and thermal efficiency, Toyota turbocharged engine equipped with D4s direct injection technology is no worse than TSI engine, and Toyota is also better in thermal efficiency.
Let’s talk about the DSG gearbox. In fact, the double clutch gearbox did not appear in the past two years. It has appeared in the racing sports as early as the 1980s, but it was first used by Volkswagen to pave a large area for mass production vehicles. In fact, the public has no bottom in mind. Only when they know that DSG has a large area of problems in China can they gain experience and constantly optimize. Due to its structural characteristics, DSG gearbox does have many advantages in terms of mobility, but its disadvantages are also very obvious. How to match the more repeated and miscellaneous urban road conditions with software and how to ensure the durability of components are all the problems that DSG dual clutch gearbox must face. You know, at present, BMW M-power is still using DCT double clutch gearbox, but BMW officials have issued a statement that it will slowly replace M-power with at gearbox in the later stage, because the efficiency and shift speed of at gearbox are very close to double clutch, but in terms of reliability, at undoubtedly has greater advantages.