Chery and Geely both use 3-speed gearboxes, plug-in hybrid range of 1300km, and single-gear is already lagging behind?

Chery Automobile unveiled a new new energy product series, Fengyun.

And this new brand sequence has now announced the information of a number of models, including Fengyun A8, Fengyun A9 and Fengyun T9 and other products, corresponding to sedan and SUV products. Judging from the official picture information, the exterior design of the model is not lacking in high-end atmosphere, and it is likely that Chery Fengyun will continue to make efforts to impact the high-end market this time.

At present, it seems that the models under the brand series of Chery Fengyun will use the C-DM plug-in hybrid system, and there is no information on whether the pure electric model will appear for the time being. It is also understandable that the positioning of plug-in hybrid models in the market at this stage is indeed very suitable, with the advantages of fuel vehicles and new energy vehicles, which has also contributed to its market share increasing year by year in recent years. The Fengyun A8, which will be the first to be launched at the end of this year, announced that it will have an acceleration level of 7 seconds and a comprehensive range of 1,300km.

From this point of view, what is the strength of Chery Fengyun's C-DM system?

C-DM, how does it work?

Chery's C-DM plug-in hybrid system has been released a long time ago, and the technical route is to save fuel and ensure good performance. In general, Chery has an ACTECO 1.5TGDI hybrid engine, a 3-speed electric hybrid DHT gearbox, and a continuously electric hybrid DHT gearbox at the technical level of this plug-in hybrid system. In total, more than 20 cars will be equipped with this C-DM system in the future.

Take this wind cloud A8 as an example, with 000 acceleration in 7 seconds and a comprehensive range of 1300km; It is necessary to save fuel in the engine at the same time, but also have high-performance power, from a technical point of view, how does Chery achieve it?

A plug-in hybrid system, the core components include the engine, gearbox and motor system, the battery plays a very small role here, nothing more than the difference between large and small batteries. Chery's hybrid engine technology has been iterated to the fifth generation of products, with a thermal efficiency of 44.5%, and the official said that the minimum fuel consumption of feed-in is 4.2L.

The engine that will be used in the Chery Fengyun A8 is this 1.5T engine. Technically, it is still a deep Miller cycle, 350bar in-cylinder direct injection, 120MJ high-energy ignition, etc.; These technical means are applied for the purpose of reducing energy consumption and ensuring performance. As a result, the power level of this 1.5T engine has reached a maximum power of 115kW and a maximum torque of 220 Nm.

For the electric motor, if it is paired with a 3-speed DHT gearbox, then the power level of the motor will reach a maximum power of 165kW, and if it is paired with an infinite DHT gearbox, then the motor power level will only reach a maximum power of 150kW. In addition to the 1.5T engine and motor, there is also a new iteration of the three-speed electric hybrid DHT gearbox and the electrodeless electric hybrid DHT. The choice of two gearboxes, in order to be smoother and more fuel-efficient, you may choose the stepless DHT gearbox; For performance, a 3-speed DHT gearbox is a must.

Next, there is a 3-speed DHT gearbox.

It is necessary to recognize that 3-speed DHT is a more advanced technology, and in terms of practicality, it is indeed better than single-speed or double-speed DHT. To give a few examples, when the throttle is at full speed, climbing at full speed or accelerating at high speed, the plug-in hybrid system is driven in parallel, and the power battery supplies power to the two motors, and the engine is also working, driving the wheels in parallel with the motors; The engine direct drive mode becomes feed-in driving at high speeds, and the dual motors and batteries are not involved in the work.

In the above two examples, if you use a dual-speed DHT gearbox, then, in the scenarios of starting, rapid acceleration, full-throttle or switching of drive modes in the high-speed range, there is one less gear connection, which is regarded as low, medium, and high, and the three gears are better understood. The emergence of the third gear ensures the smoothness of the shift, and more importantly, it plays a role in optimizing the fuel consumption in the low and medium speed range, and can also allow the engine to intervene in the work earlier, and the traditional single-speed and dual-speed DHT gearbox may not be involved in the work at 40-60km/h.

Here you can blindly guess a wave, Chery Fengyun series products (other high-end series are the same), should not be the pursuit of extreme energy consumption performance products, so there is a high probability that the whole system will use a better power 3-speed DHT gearbox, including Fengyun A8 will also be used.

But in the end, the higher the precision of the parts, the more unstable the reliability (long-term verification is expected).

Both want and want, how does Chery optimize it?

Nowadays, there are not a few plug-in hybrid cars that can run hundreds or thousands of kilometers with full fuel and electricity, such as BYD Song Pro DM-i with a comprehensive range of about 1000km. In addition, there are also those with a comprehensive range of 1300km at this stage, such as Geely Galaxy L7 (also a 3-speed gearbox). Then, there is the Chery Fengyun A8, which is expected to reach the level of 1,300 kilometers in terms of comprehensive range.

First of all, analyze a point, whether the comprehensive range level is also high, which means that the strength of plug-in hybrid products is better. The answer is yes, the longer the comprehensive range, the lower the cost of this car. For consumers, of course, it's a good thing.

As a consumer, I can't help but have some questions about this product with a range of more than 1,000 kilometers, do we really need it?

The breakthrough in engine thermal efficiency, under the premise that the fuel tank capacity remains unchanged, the improvement of engine thermal efficiency will also optimize fuel consumption performance, provided that the efficient working range has been maintained.

This C-DM system, including pure electric four-wheel drive, pure electric two-wheel drive, parallel four-wheel drive, series two-wheel drive and engine direct drive, etc., in the state of feeding, C-DM can choose the engine and the front axle output motor series output mode output, can also choose the engine and rear axle motor series output, can also choose the engine direct drive. It ensures that the engine has been maintained in an efficient working range, which plays a key role in the comprehensive range of plug-in hybrid vehicles, and because the power is provided by the motor, it also has the advantage of non-attenuation of power.

Even if pure electric is preferred, it is impossible to rule out that daily driving will encounter the working condition of feed-in driving. This time, Chery has achieved a thermal efficiency of 44.5%, which is already in the highest echelon in the industry. Therefore, on the engine side, Chery has achieved the most fuel-efficient and cost-saving solution at this stage; For consumers, the cost of using the car, at least the cost of refueling, will become cheap, especially in the case of power feeding.

After the hardware introduction, how did Chery achieve "both want and want"?

First of all, the thermal efficiency of the engine solves the biggest basic problem, with a thermal efficiency level of 44.5%, it can only be said that the starting point of this plug-in hybrid system is very high. Secondly, the motor work efficiency has also been optimized, and the work efficiency has been increased by 0.3%; In the mechanical transmission part, the work efficiency has been increased by 0.6%. It is understood that it used to run 40 kilometers with 5L gasoline + 5 kWh of electric energy, and after upgrading, it can now run about 44 kilometers. However, in terms of batteries, no more information has been announced, and it is expected that a lithium iron phosphate battery pack of about 20kWh will be added to it, providing a pure electric range of 100km.

Under the premise that the hardware has been achieved to the extreme, the comprehensive level can only be improved by optimizing the transmission efficiency. The improvement of the comprehensive range level will be directly related to the cost of our car, of course, the higher the better.