"It is advisable to hang heads in the barbarian mansions on the street to show that those who are thousands of miles away will definitely attack the powerful Han people even if they are far away."

We call ourselves Han people, speak Chinese, and write Chinese characters , it is Han culture that spreads overseas. In the five thousand years of Chinese civilization, the word "Han" has an important position and has an influence to this day. Therefore, when any product is associated with the word "Han", people will have more expectations.

A few years ago, "Han" was included in the 18 dynasty trademarks registered by the Chinese automobile company BYD, and "Han" has naturally become the car that many people are looking forward to.

A few days ago, BYD officially released the official image of its medium and large sedan-Han EV/DM. This car may be launched at the end of the second quarter or the beginning of the third quarter of 2020.

Judging from the current information, BYD Han’s performance in terms of power is most worth looking forward to. This is mainly because, first, the drag coefficient of this car is only 0.233Cd. Second, according to news in 2015, BYD Han DM’s acceleration time from 100 kilometers to 100 kilometers was only 2.9 seconds.

The powerful power performance seems to be visible, and this model is worthy of the name "Han".

The wind resistance coefficient has made great contributions to improving the dynamic performance of BYD Han

It goes without saying that the wind resistance coefficient is very important for improving the performance of the vehicle.

Because, as the vehicle speed increases, air resistance gradually becomes the most important driving resistance. It is reported that when the speed reaches more than 200km/h, air resistance accounts for almost 85% of all driving resistance. In other words, the smaller the drag coefficient, the better.

Judging from the currently exposed information about BYD Han, the car’s drag coefficient is only 0.233Cd. As for the same pure electric vehicles, the drag coefficients of Geely Geometry A, Xpeng P7, and GAC New Energy Aion? S are 0.2375Cd, 0.236Cd, and 0.245Cd respectively.

The reason why BYD can achieve such a low drag coefficient is inseparable from the efforts made in appearance styling.

If you look at it directly, perhaps in the eyes of many people, the styling design of this car is just a further improvement of the Dragon Face family-style design language.

It is true that the combination of the thick and depressed front of the car and the slightly raised three-dimensional lines on the engine hood, the flat and slender light group, the three-section inlet and the shovel-shaped front lip make this car unique. The sporty feel is richer; the fastback body shape outlined with smooth arcs, the powerful waistline and the rising rear door also give the BYD Han's side part a visual feel of being ready to go.

However, in addition, such a styling design also plays a key role in reducing the wind resistance coefficient.

The key to this lies in the design concept of "round front and rear". This is because the rounder the front of the vehicle is, the faster it can adhere to the body when the wind first hits the vehicle, while the squarer the rear is, the faster the wind can leave the vehicle body at the rear.

In addition, BYD Han is equipped with "aerodynamic" wheels with a hollow ratio of about 8%, which also ensures that the wind resistance coefficient is reduced to an even lower level when the brakes are required to dissipate heat.

Overall, BYD Han has improved its power performance by reducing the drag coefficient.

Powerful power is inseparable from the "three engines and four wheels"

The BYD Han *** released in the official pictures this time is divided into EV and DM versions. Among them, the performance of the DM version in terms of power is even more exciting.

The picture above is a piece of power information about BYD Han DM that was exposed in 2015. From the perspective of drive mode, DM version models are divided into front-wheel drive and full-time four-wheel drive.

Among them, the former’s power system will be equipped with a plug-in hybrid system consisting of a 2.0T engine + 110kW front axle motor.

The latter also adds a 350kW rear axle motor, and the acceleration time from 100 kilometers to 100 kilometers is only 2.9 seconds, making the BYD Han DM full-time four-wheel drive model's acceleration time from 100 kilometers to 100 kilometers comparable to that of a supercar. After all, the Porsche 911 Turbo car series is a classic, with an acceleration time of 0 to 100 kilometers in 3.1 seconds.

The reason why BYD Han DM can reach such a fast speed is inseparable from the blessing of BYD's third-generation DM technology.

(It was previously reported that BYD Han DM will be equipped with BYD’s fourth-generation DM technology, but judging from the current information, this car still uses the third-generation DM technology)

According to previous information about BYD’s third-generation DM technology, this technology improves vehicle dynamics from several aspects: engine, electric motor, hybrid transmission, and vehicle dynamics model optimization.

According to relevant information, engines using the Otto cycle have added technologies such as turbocharging, in-cylinder direct injection, dual variable valve timing, dual balance shafts, and all-aluminum alloy structures to increase heat generation. Conversion efficiency further reduces fuel consumption and generates more power.

The front axle motor is responsible for assisting the engine in outputting the front axle, giving the front axle a stronger power output capability; the rear axle motor is responsible for driving the rear axle, achieving full-time electric four-wheel drive. The axle power works together to accelerate to 100 kilometers in 2.9 seconds.

This also allows BYD Han DM to achieve "simultaneous power" of the engine, front and rear motors in the parallel four-wheel drive mode, giving the driver the most powerful power experience.

It is worth mentioning that with the third-generation DM technology, not only the power has been further improved, but also the power and economy have been balanced. In this regard, we can illustrate it from the working mode set by BYD's third-generation DM technology.

Among these 5 modes, in addition to the parallel four-wheel drive mode we just mentioned, which has more sufficient power performance, it also includes pure electric four-wheel drive mode, series drive mode, engine drive mode and energy Recycling mode.

Among them, in the pure electric drive mode, the engine does not participate in the work, and the motor provides power for the vehicle. According to the picture information, BYD Han DM can travel 100km. In addition, in pure electric mode, the vehicle's power does not decrease because it uses a high-efficiency permanent magnet synchronous motor.

In the series drive mode, the function of the engine is to charge the battery, and it can always run in a high-efficiency speed range. The generated electric energy drives the wheels through the front and rear motors. When walking in the city, the energy The conversion efficiency is much higher than that of direct drive with internal combustion engine.

In the engine drive mode, when cruising at high speed, the engine can operate smoothly in the high-efficiency speed range. At this time, it is not economical to perform "oil-to-electricity conversion", so the internal combustion engine is directly connected to the wheels. Drive, the conversion of electric energy no longer passes through the gearbox, and there is no waste.

In the energy recovery mode, both the front and rear motors and the BSG motor can reverse the rotation to recover kinetic energy, making up for the energy purchase costs previously spent.

Among them, the BSG motor is quite bright. It is a new motor added to the third generation DM technology. It is responsible for self-starting and stopping, kinetic energy recovery, and reverse power generation (driven by a gasoline engine). Although it is not directly connected to the wheels, it is It has made great contributions to improving the fuel economy of vehicles.

It is not difficult to see that BYD Han DM can not only bring consumers a more passionate experience in terms of power, but also has good performance in terms of economy.

Written at the end

I dare not say that BYD Han is the "most important" car in 2020, but this car is definitely the Chinese brand model that most attracts users' attention.

The acceleration time of 100 kilometers in 2.9 seconds made the public full of expectations for the power system of the Han DM before it was launched. Obviously, these are inseparable from the wind resistance coefficient and the powerful power of three-engine four-wheel drive.

What is certain is that if the price of this car is relatively affordable, it will win the attention of many consumers.

This article comes from the author of Autohome Chejiahao and does not represent the views and positions of Autohome.