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Li Xiang, CEO of Ideal Company, publicly shouted: ".Car companies with Chinese domestic brands that are still using multi-level DHT will change to the extended range technology route in the next one or two years. And the domestic Geely and Great Wall bosses also responded in the air, "resolutely not using range extensions". In fact, this also shows that there is still a lot of controversy in the domestic plug-in hybrid and extended range routes, and at present, there are indeed more and more traditional car companies that have abandoned the plug-in hybrid to embrace the extended range scheme
From the structural point of view, the engine participation of the plug-in hybrid model is higher, in the hybrid mode, the plug-in hybrid model usually adopts the series mode when driving at low and medium speeds, that is, the extended range mode, at this time the engine drives the generator to generate electricity to drive the car, and the surplus power is charged to the battery, because the motor power of the plug-in hybrid model is relatively small, therefore, when the high power output such as rapid acceleration, the engine will participate in the direct drive, and the plug-in hybrid model is more like a fuel car in generalThere is an engine, a gearbox, a mechanical transmission mechanism, and when the power is required, the plug-in hybrid model, the motor and the engine drive the vehicle at the same time.
The range extender is more like an electric vehicle, no matter low speed or high speed, it is always driven by an electric motor, and there is no plug-in hybrid gearbox, so there is no high-speed mechanical direct drive mode, butModern range extenders have an "electric direct" mode, where the generator does not charge the battery, bypassing the battery to drive the motor.
From a technical point of view, the plug-in hybrid model is more comprehensive, with a low-speed electric series drive and a high-speed oil parallel drive. And there is only one mode of range extension, that is, it is always a series mode.
Theoretically, the mechanical direct drive efficiency of plug-in hybrid models is about 95%, while the efficiency of series mode with extended range is about 91%, and a liter of gasoline is about 31-3.4 kWh. Therefore, relatively speaking, when driving at a constant speed of more than 100 km/h, the plug-in hybrid engine can run more smoothly, and in direct drive mode, the engine speed is less affected by the vehicle speed. At this time, the fuel efficiency is higher, but in the city at low speed or high speed frequent shifting, the vehicle speed and load have a greater impact on the engine speed, and the fuel efficiency is relatively low. The extended-range engine does not have any mechanical connection to the engine, therefore, the speed is more stable, although it has the efficiency of oil-to-electricity, but the trade-off, in general, the extended-range model can obtain a fuel consumption performance that is relatively close to that of the plug-in hybrid model.
The command response time of the motor is generally only tens of milliseconds, while the command response time of the fuel engine is as high as 700-800 milliseconds, therefore, if the plug-in hybrid model is matched with the urban intelligent assisted driving, it is more difficult, in the direct drive mode, due to the slower power response (if a faster response is required, it must be switched to pure electric mode), so from the perspective of popularizing automatic assisted driving in the future, the advantages of range extension and plug-in hybrid are more obvious.
There are more and more car companies that choose the range extension plan, such as BYD's high-end Yangwang, Ideal, VOYANT, AITO Wenjie, Changan Deep Blue, Leap and so on. Why are car companies willing to use range extensions?There are two main reasons for this.
1. Compared with the tram or the plug-in hybrid, the cost of range extension has advantages, reducing the battery capacity and adding a range extender, the cost of reducing the cost of the range extender should be reduced, and compared with the plug-in hybrid and the range extension, the plug-in hybrid gearbox is omitted, and the cost is also advantageous.
2. The cost saved is used to develop matching comfort configuration and intelligent assisted driving, and increase product strength and competitiveness.
In principle, the range extender can be replaced by more schemes, removing the engine and replacing it with a hydrogen fuel cell, which is hydrogen power, and the body chassis structure does not need any changes. As for plug-in hybrids, due to their more complex structure, there is almost no potential for retrofitting in the future.
A short-term direction of efforts for extended-range electric vehicles is to improve the thermal efficiency of fuel engines, at present, the thermal efficiency of range extenders is generally about 41%, and there is still a relatively large room for improvement. Another effort is to increase battery capacity and density to increase range.
The long-term direction of extended-range electric vehicles should be looking forward to the popularization and breakthrough of power batteries and hydrogen energy, China's current new energy policy is mainly to develop electric vehicles and increase charging piles, in fact, the main purpose of this policy is to solve China's energy security problems. From the point of view of production** and power generation, pure electric vehicles are not completely clean energy.
Judging from the proportion of pure electric drive between extended range models and plug-in hybrid models, in fact, this user chooses more pure electric driving, and rarely uses oil except for long-distance driving, and according to the previous mention, if the battery density increases in the future, the pure electric range of extended range or plug-in hybrid exceeds 300 or even 400 kilometers, and the thermal efficiency of the range extender is further improved, and the extended range is likely to have the last laugh.
First of all, there is no need to listen to the manufacturer's fool, whether the technology is advanced or not, for users, practical and easy to use is the last word. The battery capacity of Zengcheng electric vehicles is generally relatively large, which is very suitable for daily transportation in the city, and is used as an electric vehicle.
Secondly, you should choose according to your own working conditions, there is no problem with the daily travel of the extended range, its weakness is long-distance high-speed, and the fuel consumption is relatively high, but on the whole, does the plug-in hybrid really have an advantage?Some time ago, the famous car critic here Wuyin conducted a 40,000-kilometer long test of the ideal L8 and Lynk & Co 09 voyage version under the same working conditions, and what is surprising is that the comprehensive fuel consumption of the ideal L8 is much lower than that of the Lynk & Co 09.