[YesAuto Test Drive] 30 years ago, Audi brought the quattro to the world. Since then, more and more people have begun to understand the four-wheel drive technology; 20 years ago, when the first Audi quattro came out, and then in various parts of the world After winning the championship in the top auto races, people all over the world began to recognize and understand quattro's full-time four-wheel drive technology. Today in 2010, quattro has become synonymous with the Audi brand, and more and more full-time four-wheel drive models appear in their product series.

In order to commemorate this legendary history, in this cold winter, we followed Audi to the Hulunbuir Ice Lake and Snowfield, and once again experienced the ice and snow driving experience brought to us by quattro in the freezing temperature of minus 40℃.

The models we experienced this time are mainly Audi's A series sedans and Q series SUV models, including A4L, A6L, and the Q5 that has just been launched. In this climatic condition, in addition to feeling the joy of driving that vehicles bring us, the severe cold is a big test for people and vehicles.


About quattro four-wheel drive system

We have already introduced a lot of Audi’s quattro full-time four-wheel drive system. Its core component is the central differential located between the full rear axles. It is proud that it uses a purely mechanical structure without any The electronic intervention of the company completely relies on the physical structure to achieve, we have to lament the ingenuity of the Audi engineers back then.

Many people here equate the quattro system with the Torson differential. This is actually inaccurate. The Torson differential is actually only a core part of the quattro system. Others include the steering system, suspension, gearbox, etc. When these institutions are formed together, it can be called a quattro all four-wheel drive system.

So far, quattro has undergone 6 evolutions. The original quattro system appeared on the earliest Audi quattro models. In fact, the Torson differential was not used at that time, but only three open differentials and rear axle differentials. The device has a manual lock function. Subsequent Audi 80/100 models began to use the A-type Torson differential, to the B-type Torson differential used in the A4/A8, and to the C-type Torson differential used in today's quattro models. The Torson differential has several improvements. The A and B Torson differentials can only distribute the torque at a ratio of 50:50 front and rear, while the C Torson differential can be 40:60. The torque distribution is carried out, and the quattro system has joined the EDS electronic brake intervention from the B-type Torson differential, which has improved the performance of the four-wheel drive.

If you want to learn more about the working principle of Torson differential, you can [click here]


Change winter tires, an indispensable weapon for snow driving

In severe cold, ice and snow, the safety of vehicle driving depends to a large extent on the performance of tires. When the outdoor temperature is too low, especially in places like Hailar, which can reach minus 40°C, the rubber of ordinary summer tires will Harden, the friction with the road and other properties will also be significantly reduced, and the special rubber material of the winter tires makes the tread very soft, which can greatly improve the friction of the ice and snow roads in low temperature environments, and the unique tread pattern is also Greatly improve the grip.

The quattro full-time four-wheel drive system is certainly powerful, but no matter how powerful the four-wheel drive system does not use reasonable “shoes”, it will not be useful. This time, all models of our test drive were replaced with Michelin second-generation X ICE winter tires. As well as the Latitude X ICE winter tires specially designed for SUVs, the power of the vehicle can be transmitted well on this kind of road with extremely low adhesion.

Accelerated start on ice and snow

Although the models we have experienced this time all have a quattro full-time four-wheel drive system and are equipped with snow tires with excellent performance, you should never use the accelerator when you start. After all, the adhesion provided by ice and snow tires is limited. Even a four-wheel drive vehicle can only start idling with four wheels at high throttle. Therefore, when driving on icy and snowy roads, the throttle should be gentle, including midway acceleration. If the throttle is too high, the wheels will spin and sideways may also occur. slip.

Experience item 1: TTS drift experience

Among all the test-driving vehicles this time, the most popular one is TTS. It is the only high-performance car. We have also conducted detailed performance tests on dry roads before. It has strong power and performance. Excellent handling makes TTS a desirable car, and today I came to this ice and snow, I believe it can also bring us full driving pleasure.

It is a pity that this time TTS did not arrange a personal test drive opportunity, but just a test ride experience, but although there is no steering wheel in hand, TTS still fills its passion into every part of the body! Accelerate, turn into a corner, turn, follow up with a high throttle, reverse the direction… When the driver completes this series of actions, accompanied by bursts of sound, TTS drew a beautiful arc on the ice and sat in the car. Here you can feel the pleasure of the compact body sliding on the ice.


Experience item 2: Feel the role of ESP stabilization system

The ESP body stabilization system is nothing new now, and more and more models have begun to adopt it, but there are very few opportunities to really feel the effect of the system. Of course, we usually don't want it to have the opportunity to start. But since I came to the ice and snow for a test drive, I must feel some of the working status of ESP.

At the beginning, we turned off the ESP and stepped on the big accelerator when turning in the field. At this time, the body will slide. At this time, if the accelerator is closed and the steering wheel is reversed slightly, the body posture can also be corrected, but if it continues With high throttle, the body can only turn in circles. At this time, if you turn on the ESP, when you turn on a curve with a high throttle, and the body slips at the moment, the ESP will brake the outer wheels to correct the body posture, and at the same time cut off the power to avoid continuous high throttle output.

Although the experience process is very simple, it is the most common problem we encounter in daily driving. During the test drive, we can see the state of the vehicle when it is out of control and how the body will move. So here we can also sum up some experience, that is, when driving on a slippery or icy road, first slow down the speed; second, don’t turn the steering wheel drastically; third, don’t step on the accelerator in the corner; fourth That is, once the body slips out of control, it is necessary to reverse the steering wheel to make corrections.

Experience project 3: Snow pile crossing and line merging

Driving on icy and snowy roads has greatly increased the difficulty, but if we talk about fierce maneuvers such as winding piles, it will be even more difficult, but the quattro four-wheel drive system and snow tires play a key role at this time. , Which greatly reduces the difficulty of driving.

First of all, when crossing the pile, turn off the ESP. The control of the excess throttle and direction is very important during the course of the pile. The amplitude and speed of the steering wheel should not be too large, and the speed of the steering wheel on the ice and snow road must be reflected. It is slower, so some advance is needed, and a small throttle can be followed to help steering when passing through the pile barrel, but an excessive throttle can also make the vehicle lose control.

In fact, in addition to mastering the correct driving method, the quattro full-time four-wheel drive system also plays a very important role when piercing the pile. The torque is distributed reasonably according to the needs, and the stability of the body is better than that of a simple front-wheel drive or a rear-wheel drive. In addition, snow tires also provide better grip. And imagine that if a two-wheel-drive vehicle pierces the pile on the ice and snow road, I am afraid that it will have lost control after the first pile bucket.


Experience Project 4: Q5 Ice and Snow Cross-country Show

We are talking about Audi's four-wheel drive sedans, so let's talk about SUVs equipped with quattro system. The test drive provided by the manufacturer this time is the Q5 that has just been launched. So since it is an SUV model, the off-road project is necessary.

In fact, we have fully demonstrated its off-road performance in our previous Q5 test, so this time we come to the ice and snow field, let's show it to everyone.

The first is the field built by staggered logs. At the beginning, the Q5 passed through obstacles at a certain speed. The vehicle was not hindered in any way. The four-wheel drive system was also stable, and none of the wheels slipped. However, if you are very laissez-faire on the throttle, unscrupulously high throttle, the ice and snow will still give you a good start. Therefore, the most important thing in a snowy day is to control your control range, as soft as possible.

In fact, this is a relatively common situation in daily life, especially in this extreme environment, it will bring greater difficulty, even if it is a powerful four-wheel drive system and excellent performance of ice and snow tires, if you encounter too much Extreme conditions and extreme weather are sometimes powerless.

We have already explained this in detail in the test article, you can refer to the previous article [click to enter]


Highlights:

I believe everyone still remembers the commercial when the A6 was launched. An A6 climbed up a steep slope. This is a ski jump in the city of Kaipula, Finland. The angle reached 37.5°. At that time, everyone was skeptical. It’s true, but it’s certainly true now. However, two changes were made to the climbing vehicle at that time. The first was to fix the automatic gearbox in first gear. In order to ensure continuous power output, the second was to install it. Snow tires with 6 mm steel studs to ensure sufficient grip, and the climbing process does not rely on any external force.

And today at our event site, in order to commemorate the 30th anniversary of quattro, the organizers also built a steep slope, of course, the angle and length are not comparable to those in the commercial.


Test drive summary:

Although the snow and ice test drive is only a short day, it is difficult to experience for us in normal times. We understand the true out-of-control state of the vehicle, and also learn how to better master the method of snow driving, and at the same time We have also experienced the benefits of quattro full-time four-wheel drive system driving on icy and snowy roads.

Quattro has gone through 30 years of history. With its unique design, it can still be said to be one of the most advanced four-wheel drive systems. Quattro is not just the name of a technology, it has become more advanced by Audi. With the inheritance of technology, we also hope that the quattro technology can be more advanced and more powerful in the future!

Model detailed parameter configuration table