The four wheel drive system is the best??

Subaru is a piece of.

The best all-wheel drive system is BMW's xdrive intelligent all-wheel drive system.

BMW's patented xdrive sets new standards in terms of all-wheel drive agility. The job is to quickly change the torque distribution between the front and rear axles to provide realistic driving stability, driving pleasure and safety.

xDrive can be fully adjusted and has infinite variations. It calculates for understeer or oversteer in cornering and provides the optimal torque to the required axle at all times.

Advantages of BMW's xDriveX all-wheel drive system:

The core technology of the drive system is the four-wheel drive system developed by Magner Steyr of Austria, its working principle is to adjust the torque distribution uninterruptedly, in addition, it can realize the distribution of torque according to the road conditions, and effectively transmit the maximum torque required by the front and rear wheels, it is worth saying that the XDRIVE system is 40:60 in the default state of front and rear torque distribution, and the maximum front and rear torque distribution ratio is between 0:100 and 100:0, And its torque distribution can be done quickly in seconds.

Disadvantages of BMW's xDriveX all-wheel drive system:

This four-wheel drive system does not have a mechanical ** differential like Mercedes-Benz Audi, its ** differential uses an electronically controlled multi-plate clutch, front and rear are open differentials, very dependent on electronic assistance functions, although it can quickly change the power distribution of the front and rear axles, so as to suppress roll and maintain the body attitude.

BMW XDRIVE relies too much on the electronic system, and the durability of high-intensity and frequent speed differences is not good, which also leads to the BMW XDRIVE four-wheel drive system is not suitable for off-road, and at the same time, the maintenance cost of this four-wheel drive system is also very expensive, and the BMW XDRIVE four-wheel drive structure is used more in urban road conditions.

German - all-wheel drive system.

When it comes to the German system, it is the ABB troika, and the four-wheel drive system is nothing more than Audi's quattro, Mercedes-Benz 4-matic, and BMW XDRIVE.

When it comes to Audi's four-wheel drive quattro, it is strong because it can do things that other brands can't do by means of pure mechanics, and because of pure mechanics, it is more reliable, more durable, and quite responsive. Nowadays, Audi's all-wheel drive is used more for body stability and better grip. But don't underestimate the Quattro's off-road ability, the Quattro has added an electronic differential lock EDL, which passively compensates for the disadvantage that only the front and rear axles can only distribute power to the front and rear axles, but not to the wheels on both sides of the coaxle.

Therefore, it can be said that Audi's all-wheel drive system is the highest all-rounder!

Mercedes-Benz's four-wheel drive system, everyone is undoubtedly most impressed by Mercedes-Benz G, which has a longitudinal engine + three locks + transfer case + low-speed four-wheel drive + electronic assistance, which may be the most powerful four-wheel drive structure at present, which is often said to be the "strongest on the surface" mode.

However, Mercedes is not kind when it comes to four-wheel drive. The 4matic on the low-to-mid-range models is called the 4ets, so most of it is just decoration. And this set of technology is actually electronic brake assist, also known as electronic differential, it is not the actual mechanical structure, but through the computer analysis of the vehicle state to the slipping wheels to brake, to simulate the role of differential lock.

However, something is better than nothing, but the overall cost performance is not high!

After talking about Audi's quattro and Mercedes-Benz's 4-matic, BMW is definitely indispensable. BMW's all-wheel drive system is similar to Mercedes's, with the help of braking to limit the power distribution among the four wheels. This was followed by the development of the Dynamic Drive Performance Control System (DPC).

In addition to the power distribution between the front and rear axles of the original four-wheel drive system, the system adds power distribution between the two wheels of the rear axle. For example, when the vehicle understeers, the power is first transferred to the rear axle, and then more power is distributed to the outer wheels through the clutch on the rear axle, so as to finally achieve the purpose of correcting the steering attitude.

Therefore, one of the biggest advantages of xdrive is that when accelerating, more power can be allocated to the rear wheels, and then the center of gravity of the car is shifted backwards, and the rear wheels have more grip and faster acceleration ability. There are advantages and disadvantages, and there are advantages in performance, but in off-road, BMW's four-wheel drive has become a chicken rib! It has also become the most partial four-wheel drive among ABB!

Japanese - four-wheel drive system.

When it comes to Japanese four-wheel drive, what you think of is definitely Cruiser's four-wheel drive and Subaru's four-wheel drive. In fact, the essence of Japanese real four-wheel drive depends on Mitsubishi.

Mitsubishi has built one of the world's most competitive four-wheel drive platforms and the most complex four-wheel drive system in the world. The Mitsubishi EVO is equipped with the S-AWC all-wheel drive system, which implants three genuine differentials in the front, middle and rear, each with a built-in set of limited slip and active torque vectoring control, also known as the all-wheel control system. 

Among the world's cars, why is the best four-wheel drive system made in Japan?

Rear-wheel drive is better. Four-wheel drive refers to the distribution of engine torque to the front and rear wheels in a fixed proportion, which can have better off-road and handling performance at all times, but has higher fuel consumption. The time-sharing four-wheel drive is controlled by the computer chip two-wheel drive and four-wheel drive switching, in the normal road, the vehicle in two-wheel drive mode, in case of outstanding situations, the computer will detect and automatically distribute the power to the other two wheels.

For the time-sharing four-wheel drive mode, the quality of the control program will affect the intelligence of the drive mode switching.

Respective advantages:Advantages of rear-wheel drive carsThe advantage of rear-wheel drive is that the front and rear weight distribution is more evenly distributed, which makes the operation more sensitive. Rear-wheel drive mainly relies on rear-wheel drive to drive the power of the car.

This distribution has less friction on the front wheels, which greatly reduces weight and improves fuel economy.

Advantages of a 4WD4WD is just a 4WD with front and rear differentials. The power of the engine can be evenly distributed to the four tires, so that all four tires can propel the vehicle forward. The driving system of this driving mode is generally very powerful, and it also has good driving ability in bad road conditions.

Precursor, with the widest coverage.

At present, front-wheel drive vehicles account for the vast majority of our automobile market. If the drive form is compared to a rickshaw, then the front wheel drive is like a person pulling the car in front, because the engine is in the front of the body, so the power of the engine can go directly to the half shaft to drive the front wheels through the transmission system.

The reason why the front-wheel drive can cover such a wide area is that the cost of the driveshaft and some parts is omitted, so the cost of the front-wheel drive is low and it is easier to use the space, and reducing the loss of the driveshaft will theoretically be more fuel-efficient, but the front-wheel drive will let the front wheels serve as the drive, steering, and carrying three important tasks at the same time, so the front and rear weight of the front-wheel drive car is not easy to distribute, and the handling will not be too good in theory.

Of course, it is four-wheel drive, and all four wheels can be driven, but it is expensive and burns oil. Rear-wheel drive is better than front-wheel drive because the front wheels control the direction.

Depending on what road conditions you take, the city will choose the front drive bar to save fuel, four-wheel drive has artificial four-wheel drive and real-time four-wheel drive, if you take mountain roads and rural areas.

It depends on where you drive more, if you are in the city, then the two-wheel drive is enough, if you usually drive the slope and so on, then the four-wheel drive! But it's still cool to drive!

Should you choose front-wheel drive, rear-wheel drive, or four-wheel drive when buying a car, and what are the differences? I won't understand until I read it!

The two-wheel drive (front-wheel-drive) structure is simple, easy to maintain, and fuel-efficient. The handling of the four-wheel drive is top-notch, the acceleration is fast, and it is not easy to skid.

If I say it's better to have four wheel drive, but I like the rear drive!

Four-wheel drive is good, the power is strong, but it costs fuel.

For family SUVs, it is better to choose a two-wheel drive car, because for family SUVs, most of them will use a timely four-wheel drive system, which will be relatively flexible and can automatically switch to two-wheel drive or four-wheel drive mode according to the driving conditions of the vehicle.

Under normal circumstances, as far as ordinary family cars are concerned, they are generally two-wheel drive; In the case of an SUV, it may be a well-timed all-wheel drive system. The four-wheel drive system will be relatively flexible, and can automatically switch between pure two-wheel drive or four-wheel drive mode according to the vehicle's driving conditions.

In addition, there is a time-sharing four-wheel drive system, the situation is similar, but it needs to be manually switched, so the operation will be more cumbersome; Full-time four-wheel drive, on the other hand, is more common in off-road models, which means that it can provide driving force for each wheel at all times.

If you talk about the experience of driving in spring, it must be that the full-time four-wheel drive system is better, which can bring better handling and off-road quality; If it is a family SUV model, then if it is equipped with a timely four-wheel drive system, it is also very good, and it is very advantageous if it encounters skidding. If it is a family car, then the two-wheel drive system is also sufficient.

The biggest difference between a two-wheel drive vehicle and a four-wheel drive vehicle:

That is, the two-wheel drive vehicle is driven by two wheels. Two-wheeled vehicles are divided into front-wheel drive vehicles and rear-wheel drive vehicles. There are more rear-wheel drive cars than performance cars, while family cars are basically front-wheel drive cars. Since it is to be compared with the four-wheel drive system, we also take the SUV model as an example of the two-wheel drive car here.

The two-wheel drive vehicle is no different from the four-wheel drive model in terms of appearance, interior, driving vision and driving experience. However, because it is a two-wheel drive vehicle, the load on the engine is significantly reduced, and the fuel consumption is greatly reduced. In addition, the ** of a two-wheel drive vehicle is generally lower than that of a four-wheel drive vehicle.

The electrostatic precipitator of the second burning machine head was transformed in 2009. The original factory site is limited, only the location of the new dust collector on the east side of the original dust collector, and the other 1 needs to be newly built at the original dust removal location. Since the electrostatic precipitator of the sintering machine head is the best production equipment, in order to reduce the impact on the production time.

Construction plan: build a new dust collector in the open space on the east side, and connect the east flue to this dust collector for the first time after the dust collector is completed. Dismantle the original Dongtai dust collector and build another dust collector, after the dust collector is completed, the second contact will be connected to the west flue to the new dust collector, the second burner head electrostatic precipitator was completed at the end of 2009, and the design emission concentration of the dust collector is 50mg m3.

The electrostatic precipitator of the second and third burning heads can meet the new national standards under normal production conditions. However, the emissions of western burning and new burning cannot meet the requirements of the new national standards. Domestic and foreign sintering head flue gas purification all use electrostatic precipitator, the new national standard requires the emission to be less than 50mg m3, which is difficult to achieve at present, although the electrostatic precipitator increases to 4 electric fields, but the sintering head electrostatic precipitator is affected by the process temperature, humidity, specific resistance is fluctuating, and the emission of sintering head electrostatic precipitator is also fluctuating, especially the fluctuation of sintering production, sintering machine start-up and shutdown, etc.

At present, more than half of the sintering machines in the country have completed flue gas desulfurization, that is, the dust in the flue gas has been further processed by the desulfurization process after passing through the electrostatic precipitator, and the exhaust flue gas can fully meet the new national emission standards. According to the requirements of the national "Eleventh Five-Year Plan" emission reduction plan, the ironmaking plant began to adopt the Danish rotary spray semi-dry desulfurization process in 2009, and successively completed the flue gas desulfurization facilities of 6 sintering machines, and the dust emission of 6 sintering heads of the ironmaking plant after desulfurization bag dust emission of 30mg m3 fully meets the requirements of the new national standard. In order to meet the requirements of the new national standard of 30mg m3, the existing electrostatic precipitator can be increased and transformed

The first is to increase the circulation area, reduce the wind speed of the electric field, and prolong the residence time of the flue gas medium in the dust collector, which is equivalent to dismantling the existing dust collector and widening and heightening it on the original basis; The second is to increase the number of electric fields, the original dust removal is retained, and the original inlet or outlet bell mouth is removed and increased to an electric field, so as to increase the area of the dust collection plate of the electric field, prolong the time for the flue gas to stay in the electric field, so as to improve the dust removal efficiency; Another solution is the electric bag reform scheme: retain the original electrostatic precipitator foundation, shell, ash hopper, bell mouth and ash conveying system, only remove the plate line and rapping system of the original electric field, and remake the upper box to install the cloth bag, but due to the increased resistance of bag dust removal, the original motor needs to be increased. The above scheme is comprehensively considered from the stability, effect, investment, construction period, site, etc., and the electric bag modification scheme is the best.

Two-wheel drive and four-wheel drive, I personally think it will be better to take a wide four-wheel drive: 1. Four-wheel drive can distribute engine power to 4 wheels, which can greatly improve the vehicle's handling and ability to clear and eliminate stupidity. At present, four-wheel drive is generally divided into: full-time four-wheel drive, time-sharing four-wheel drive and timely four-wheel drive;

2. Full-time four-wheel drive: this transmission system does not need to be operated by the driver, the front and rear wheels will always maintain the four-wheel drive mode, and the engine output torque will be set on the front and rear wheels according to 50:50 when driving, so that the front and rear wheels maintain the same amount of torque;

3. The full-time drive system has good driving control and driving tracking, and with the full-time four-wheel drive system, it can drive smoothly on the paved road. However, its disadvantage is also obvious, that is, it is more waste oil, and the economy is not good enough. Moreover, the vehicle does not have any device to control the difference in tire speed, and once a tire leaves the ground, it tends to make you stagnate there and not be able to move forward;

4. However, some intelligent full-time four-wheel drive systems have also been developed, such as Audi's quattro, which can redistribute torque and distribute more torque to the non-slippery drive wheels when encountering special road surfaces, thus solving the disadvantages of old-fashioned full-time four-wheel drive.

Millions of car purchase subsidies.