Automotive Black Technology Chapter 626: : A true all-around sports SUV!

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The Q5 part that Xu Fufang is responsible for has also been completed.

In fact, if we don’t consider the time and space before the historical process changed, Q5’s sales volume in the Chinese market would have been incredible. Li Fanyu wanted to maximize the increase in double point BUFF by relying on sales volume, and to cooperate with the new product launch and the biodiesel breakthrough plan, Li Fanyu didn't want to build this car at all.

Why?

Because this car gave Li Fanyu a really bad impression.

Let’s just say that in the time and space before history changed, the Q5 can be said to be the most distinctive and least distinctive car of Audi.

This car is actually a newcomer to the Audi family. It doesn’t have as long a history as A4 or A6. This car was first launched in 2007 and launched in China in 2008.

At the beginning of product design, we were aiming for the Chinese market.

So you can see that this SUV model is developed on the A4 sedan platform and adopts the design style of the third-generation Q7.

This may be the biggest highlight, or it can be said that there is no highlight. It is said to be unique because this guy has all the shadows of the two generals of the Audi family at that time, the A4 and Q7. It is said to have no characteristics because apart from these shadows, the Q5 does not have even a little bit of other advantages.

At the beginning of its launch, the only thing that Q5 was praised for was that it was equipped with the quattro full-time four-wheel drive system that was already dominating the competition at that time, and its so-called "sensitive form structure". However, the immature seven-speed double The clutch is installed on the vehicle. Due to its limited endurance, the vehicle's power performance is quite weak or even helpless when the electronic control unit intervenes to control the power. And although Audi claims that it is a "dynamic and all-round SUV", it does not equip this car with some configurations such as differential locks and limited slip between wheels, which greatly reduces the off-road performance of this "all-round" SUV.

After 2008, it went through three model changes in time, and until Li Fanyu got the major upgrade before Xapp, this problem has not been solved.

So, in Li Fanyu's mind, if the Q5 can be driven as a sedan, it is absolutely fine. The ride feel is basically the same as that of the A4. But if you want to go cross-country, take a break.

In a word; regardless of off-roading, this is still a good car.

But in other words; let’s not talk about off-roading, how about we buy a cheaper A4?

With Audi's R&D level in that time and space, Li Fanyu didn't believe it when he said it couldn't solve this problem.

It can only be said that Audi is too lazy to change it; after all, the sales volume is there, and whether it is good or bad, it will not delay sales, so why bother to make changes to it?

But since Li Fanyu wants to put this car on the market, he will definitely not do anything cheating. The Germans can go to the Chinese market to steal money, but Li Fanyu makes cars and sells them to fellow villagers!

Money must be earned. Things must be done. However, conscience must be spoken.

So, after exchanging this car. Li Fanyu made certain modifications to this model.

In addition to the original two gasoline versions of the ZGX888 series, 2.0TFSI and 2.0FSI, a 3.0TDI turbocharged diesel engine with enhanced off-road performance has been added.

Needless to say, this change is an important part of the plan to match the biodiesel wall-breaking plan. Therefore, even if we do not consider improving the performance of Q5, it must be done.

And such strong power must be matched by an excellent gearbox. This is why it is always said that the engine and gearbox are a powertrain.

In addition to implanting the upgraded and enhanced seven-speed dual-clutch on the RS into the flagship version, it improves the shifting speed and highway performance. Li Fanyu also paired an 8AT automatic transmission derived from Cadillac with the diesel-powered version, further improving the vehicle's stability and power output under ground torque.

In terms of driving, he worked with Xu Fufang’s team to configure this manual mechanical differential lock, which has expired the patent period, on all Q5 models.

Although this technology is not new, it is still a must-have tool for most off-road vehicle dealers on the market.

Why?

This matter has to start with the differential lock, a good friend who has been in love and killed for half a century;

Today's cars are equipped with differentials in order to obtain better driving power.

In the past, the wheels on both sides of the carriage were connected through a hard shaft, so the rotation speed of the wheels on both sides was always the same. Because there is no differential speed, the inside wheel will have sliding friction in addition to rolling friction when turning.

Fortunately, the wheels of the carriage are made of wood and are wear-resistant... And the horse is stupid and doesn't know that the different speeds of the two wheels will make it very tired...

But to be fair, cars will have the same problem when turning. If a hard shaft link is still used, the car's tires and other components will be seriously damaged when turning.

In order to solve this problem, cars are designed with two half-shafts. The differential connects the two half-shafts. The differential allows the wheels on both sides to have a speed difference. When cornering, the four tires will achieve better driving performance.

It sounds very fancy, but this technology actually uses a set of star gears to achieve different speeds of the wheels on both sides;

The set of planetary gears in the differential housing can be viewed abstractly as a "gear" with only one tooth, that is, a stick. This stick can connect the axle shafts on both sides and drive the two axle shafts. Rotate.

But in addition to rotating with the transmission shaft, this stick can also rotate on its own.

If the friction on the vehicles on both sides is the same, then the stick will not rotate, that is, the wheels on both sides rotate at the same speed; if the friction on one side of the wheel is greater than the other, then the stick will The stick itself will rotate, so by adding the rotation without changing the revolution speed, the purpose of different speeds on both sides can be achieved.

In other words, if one wheel is stuck and cannot rotate, that's okay. Although the power is still there, the rotating stick will drive the wheel that is not stuck to rotate.

If more sticks are added, a gear is formed, a planetary gear, which is also the core part of the differential.

But if the car is equipped with this thing, then the problem arises.

With this thing that allows the tires on both sides to rotate at different speeds, it will be really troublesome in bad road conditions.

For example, if a car is stuck in sand or mud, one wheel on one side is stuck and the other wheel is slipping. The differential will work, because the mission and significance of the differential is to allow the speed difference between the wheels on both sides.

In this way, the wheel on one side that is stuck remains stationary, while the wheel on the other side will rotate crazily due to the action of the differential.

One side is stuck and the other side is spinning wildly. Not to mention moving forward, the car is likely to get stuck deeper and deeper.

The differential lock is actually a thing that prevents the differential from working.

The same is true when one wheel is stuck and one wheel is slipping. If you use a differential lock to lock the differential and put the two half-shafts into a hard-linked mode, the power can be transmitted to the "stationary" wheel normally.

The differential lock will use a tooth-type structure to rigidly connect the two half-shafts to become a whole.

This way the wheels on both sides can get the same power, allowing the vehicle to get out of trouble.

This is what the differential lock does!

The differential lock installed by Li Fanyu on the entire Q5 series is actually a very ancient thing. The production cost is only over 200 yuan. Such a low cost means that the structure of this thing is not complicated.

This kind of differential lock cannot be turned on at ordinary times. If it is turned on during normal driving, it will cause damage to the wheel axle, so it needs to be turned on manually when the speed is lower than 5KM/h.

You can say that he is not advanced or humane.

But!

When the vehicle is in dire straits, it can achieve a reversal with this thing worth more than 200 yuan!

It is such a simple and crude thing, but it can greatly improve the Q5's ability to get out of trouble on non-paved roads and even extreme roads!

With these two modified configurations of the gearbox and differential lock, coupled with the powerful power output of the TDI diesel engine at low torque, Li Fanyu was confident about the off-road performance of the Zhengxin Q5.

This also allows him to explain with peace of mind to the group's marketing department and operations department to promote the Q5 as "Audi's new generation all-round sports SUV"!