With a range of more than 2,000 kilometers and a fuel consumption of 2.9L, how did BYD do it?

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2024-06-02 18:59Posted in Guangdong automotive creators

When the technology iterates to a certain extent, the market pattern may undergo profound changes, and the Qin L and Seal 06, the two first DM5.0 models, are a good example. As long as it can bring users a more economical car cost and a more disruptive car experience, the market will undergo unexpected changes.

You should know that although the DM5.0's fuel consumption of 2.9L/100km is measured under the NEDC standard, the result of the more stringent WLTC mode is 3.8L/100km. But even such results are already very eye-catching in the market.

What's more, at the site of the release of DM5.0 technology, a large number of media measured and posted amazing results below 2.5L or even less than 2L/100km. The Qin L and Seal 06 models equipped with DM5.0 technology can still achieve an acceleration of 7.5 seconds to 100 kilometers, proving that it has not come at the expense of power.

So how did such a magical DM5.0 system achieve such a low power loss and fuel consumption? Let's try to break it down this time.

1. Efficient engine

In the state of vehicle power loss, the high efficiency of the engine will become the most basic guarantee condition. Therefore, improving the combustion efficiency of the engine is one of the key points of the DM5.0 system.

The DM5.0 system is equipped with a 1.5L naturally aspirated engine with a compression ratio of up to 16, and is equipped with technologies such as high tumble air duct, intelligent combustion system, intelligent EFI system, EGR before urging air extraction, intelligent split cooling, and intelligent variable lubrication system, so that the thermal efficiency of the engine has exceeded 46.06% at most.

And in terms of start-stop strategy and working condition point optimization, BYD has also invested a lot of effort. After optimization, the fuel efficiency of the engine has a larger operating range, which makes it easier to achieve long-term efficient operation, which provides a good basis for the engine to minimize fuel waste and achieve direct drive and power generation more efficiently.

Second, a more efficient electric drive system

In addition to the engine itself, the electric hybrid system assembly, which plays an important role in the coordinated control of oil and electricity. The DM5.0 EHS hybrid system achieves a comprehensive operating efficiency of 92%, an increase of 5% compared with the 4.0 version of the system, and a power density of 75.47kW/L, an increase of 15.5%.

The realization of high efficiency is inseparable from the optimization of details between individual components. First of all, in terms of electric drive, the motor with segmented magnet and ultra-thin silicon steel sheet technology, as well as the lubrication method of double pump coupling and rotor oil rejection, coupled with the structural improvement of the bearing and clutch, brings better power conversion efficiency.

Secondly, as an important energy storage component, the blade battery itself has also been further strengthened, and the new generation of plug-in hybrid blade battery has an energy density of up to 115Wh/kg, which is 15.9% higher than that of the previous generation; The discharge rate is as high as 16C, which is increased by 33%; The feedback rate is also as high as 5C, an increase of 20.3%.

Efficient battery charging and discharging capacity needs to be achieved based on stronger temperature control capabilities, and if there is no suitable temperature range, the charging and discharging efficiency of the battery will also decrease.

The new generation of blade batteries uses the latest battery direct cooling technology in terms of heat dissipation, and the runner has changed from a simple T-type to a more efficient S-type, which has a more uniform heat conduction effect on the inside of the battery pack.

In terms of heating, the new generation of blade batteries also uses a new pulse self-heating technology, that is, through automatic control of current pulses, to achieve rapid heating of the battery pack, instead of relying on the traditional PTC heating method with high energy consumption; In addition, the new pulse self-heating technology can operate in a wider range of scenarios, such as parking, driving, and charging, and the real-time heating will be even better.

In addition, the further integration of the electronic control system can promote the system to be more compact, further reduce the number of components and internal resistance inside the system, and improve the control efficiency of the electronic control system.

3. Intelligent control strategy

With an efficient engine and an efficient electric drive system, the control coordination strategy between the two will become the most critical part. In fact, when the efficiency of the system itself is high enough, the engine only needs to work efficiently for about 0.2 hours, which is enough to support the energy consumption of the vehicle for one hour of power loss.

However, for different vehicle use scenarios, the vehicle's energy consumption requirements are different. Therefore, in different vehicle scenarios, it has become the key point for the system to achieve high efficiency and low fuel consumption by keeping the engine in an efficient state as much as possible to ensure sufficient power generation.

The new generation of DM5.0 system, due to the realization of the multi-integration of the electric drive system, has changed the previous multiple systems to control power consumption according to their needs, resulting in a lack of coordination of "going it alone", such as using the waste heat of the engine to achieve the heating of the battery system.

In addition, the new DM system can judge the current usage scenario according to the current user's input for vehicle control, and carry out collaborative control of each part through the integrated system, and intelligently adjust the vehicle power, voltage, etc., which greatly reduces the local power consumption waste in the electric drive system.

summary

Judging from the information released this time, the improvement of the new DM system is more in the local optimization of the current structural parts, the efficient integration of hardware, and the more efficient collaboration and more intelligent software control strategy based on hardware integration, rather than making significant adjustments to the structure of the entire system as previously disclosed in the patent. It can be seen that the cost of the new system is controllable, and it can be quickly matched to other BYD plug-in hybrid models in the future.

On the basis of not making significant changes to the structure, such an obvious fuel consumption optimization can be achieved, which is ultimately due to BYD's own mastery of the whole industry chain in batteries, motors, and electronic control. Compared with other car companies using the purchased parts integration system, BYD not only has a higher cost control ability, but also can master more accurate and detailed system data samples, which is more targeted for system optimization and has higher system adjustment capabilities. In the future, we do not rule out that BYD will launch a more powerful hybrid system based on its own integration capabilities, and will it cause a huge response in the market at that time? It's worth the wait! Welcome to pay attention to "Boundless Car Domain" and leave a message in the comment area below to share your views.

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