I believe that there is such a group of Audi owners around you. After buying S3, RS3, the four-wheel drive model will always boast the people around him, there are more powerful, more than bent, and acceleration is like it is The string arrow is generally sharp! Many Audi owners don’t know, and it is slightly faceful. In fact, “quattro” is only a trademark of Audi, “quattro” does not specifically refer to a four-wheel drive form, “quattro” this logo is only only Can represent: This is a four-wheeled Audi!
As for the Audi four-wheel drive models that were born in the MQB platform, both S3, RS3 or Q3, actually their four-drive system is not Audi is proud of Torson’s four-wheel drive, but the 4Motion of the Volkswagen Tiguan, Golf R, and Toung! So, in order to avoid the promotion of the manufacturer, it is not distinguished by the manufacturer. Today we will come to reveal the old bottom of the Audi Quattro!
For most fans, or in general, quattro four The effect of the drive should be like this! Not only has excellent vehicle handling, but also over the mountains! This sharp quittro system is actually Audi started from 1987 and is implemented based on the Torson differential manufactured by the United States Jiecot. With the excellent performance of Tony differential, Audi Quattro swepts the B group tensile stadium in the 1980s.
However, since Toyota acquired Jiecott, the production of Torson differentials in 2001, in order to avoid restrictions on competitors Toyota, And long-term payment of patented fees to Toyota Group, the purchase fee, so Audi began to quickly develop a new Quattro four-drive system that belongs to his own patent. In the past 9 years, Audi finally pushed the “coronary gear four-wheel drive system” similar to the Torson differential in 2010 to the market, which is also the traditional Chinese consumer.Quattro four-wheel drive system.
Compared to the Quattro system based on the Torsen differential, the coronary gear quattro, which is developed by Audi, on the overall four-drive effect. There is not much difference. It is still maintained by a purely mechanical manner to maintain the power distribution of the first 40: after 60: and by the coronary gear and the electronically controlled manner to allocate the power of the front rear axle.
, for example, when the system detects the front wheel slip (the yellow gear on the right side of the figure), the front end of the coronate gear accelerates rotation (red frame) Location, thereby driving the middle planetary gear (white frame position), at which time the electronically controlled clutch will be combined, the power of the vehicle will move from the rear axis of the front axle of the front axis of the slip, up to the front and rear axis power ratio Reached 15:85. When the frame is slippery, it can also give the front wheel more power, but only the maximum power ratio of the front wheel can only have 70% of the output, which is 70:30 before and after. 
According to the characteristics of the above-mentioned coronary gear Quattro system, it can be found that the quittro cognitioned by Chinese consumers is actually a more biased direction. The rear wheel driven four-wheel drive system, and automatically allocates the front rear axle power when the vehicle is slippery. In addition, the Quattro four-drive system using the coronary gear can also select the moving differential kit in the rear axle, thereby dispensing the rear wheel power of the left and right sides to create a more excellent handling.
Now we have learned what quattro in the traditional sense looks like. Then we are prepared today, those quattro born in the MQB platform model, or what is the performance and working principle of 4Motion?
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Whether it is the public or Audi, they have not put too many “skill points” in the horizontal four-priced option. Because of this, compared to the current self-developed coronary gear four-drive structure, the public and Audi have directly adopted “golden” in the horizontal platform, and the purchase is from Haldex (德). Four-wheel drive system.
Since buying is a ready-made four-wheel drive system, the mass and Audi have naturally been unable to intervene in the development and design level. In addition, the horizontal four-drive is applied to the inexpensive four-wheel drive platform, so Haldex controls the cost of the entire device when designing this four-wheel drive system. In other words, compared to the coronary gear structure developed by Audi, Haldex’s horizontal four-wheel drive system is simple.
For example, in terms of power distribution, in order to exchange better fuel economy, use the Haldex five generation Quattro four-drive system, most case It is the power distribution of the first 100 after 0. The power distribution of the limit can only be 50:50 before and after. So, S3, RS3, TTS, TTRS, Q3 based on the coronate gear four-wheel drive system, and the driving feeling of the former drive is more biased in daily driving. That is to say, the horizontal Audi four-wheel drive type cannot be considered a true full-time four-wheel drive.
In addition to the difference in power distribution, the media of Haldex and the coronate gear responsible for allocating power is also different. The four-wheel drive system using the coronary gear is to change the power distribution by multi-chip clutch by means of a more costly electronic control machine. On the horizontal four-wheel drive of Audi, the Haldex fifth generation product is to promote the power distribution of the multilayer clutch by the electric oil pump. Compared to mechanical, the way to control the clutch is obviously slower.
However, based on the fifth generation of Haldex’s QUttro is not an unwanted, compared to the typical lang four-driven lag logic that detects the rear wheel slip, the fifth generation HALDEX can be pre-locked by ESP, ABS, speed sensor, and accelerator pedal strokes, so that The vehicle has a better traction performance.
There are two quattro, which is currently recognized by the vast car, one The species is the coronary gear quattro described above, and there is a quittro Ultra that is controlled by the motor. Although Quattro Ultra is not unsatisfactory by many Audi fans, Quattro Ultra is obviously more powerful than the random “quattro” using the fifth generation of Haldex.
Thanks to the quittro Ultra, it can directly cut off the relationship between the central transmission shaft and the rear wheel differential, so this set is only suitable for vertical engines. The four-wheel drive system of the model, in fact, in the front drive mode, it does not need to drive any four-wheel drive components at all, which can reduce the fuel consumption.
However, based on the race of Haldex, it is not the case, because the fifth generation Haldex does not have a drive shaft in front drive mode and The clutch sheet in the center differential is not broken in the binding state, so the transmission resistance will be greater, and ultimately leads to the transmission efficiency. That is, in the fuel economy, the race Quattro is not even as long as the Quattro Ultra.
In terms of power distribution, since both are based on a plurality of clutches, and are the relationship between milliseconds, transverse There is no difference between Quattro and Quattro Ultra. But it is also because both are based on multiple clutchs, so at a long time.Because the high-intensity work conditions are also overheated by the clutch tablets, the power of the rear wheel of the vehicle is getting smaller and smaller, and the meaning of the four-wheel drive is lost.
After understanding the truth of Audi’s race quattro, we may wish to Learn about what is the most stronger quattro. If only the track performance, quittro using the coronary gear + motor differential (left and right rear torque vector distribution) like Audi S5 is obviously the most powerful in the Quattro family. But if you change the scene to off-road, it is not so.
For Audi, playing the four-wheel drive system, it is certainly not the research and development of electric four-wheel drive system when building a new energy model. So in E-TRON, we can see that the front and rear axles of this car are installed, while the two motors before and after completing the power allocation of the front and rear axes within 30 ms, thereby avoiding the wheels to slip. Coupled with ESP-based electronic sliding differentials, it has to be recognized that in a practical cross-country scene, E-TRON’s theoretical off-road performance should be the strongest in Audi. 
Although this article exposes the secret of Audi’s race quattro, In fact, all bus vendors are doing the same thing, Mercedes 4matic, BMW’s XDrive, 4Motion of the public, these four-drive names are only trademarks, not specific products. Even the 4motion on the Volkswagen is actually the quittro of the coronary gear. So when you touch those who brag 嘘 yourself s3, QUATTRO, there is more invincible people, directly, “Volkswagen 4Motion” is just ~