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| take the facts away and leave the point of view |
In the past 2021, BYD DM-i Super Hybrid can be described as a year of great success, with hot sales, more hot orders, and even the need to queue up to wait for the car. Perhaps because there are not many people, BYD's DM-i super hybrid system has been facing various doubts since its release. At first, everyone expressed doubts about its claimed ultra-low fuel consumption, and countless car owners confirmed that they could indeed achieve low fuel consumption after picking up the car; later, it was doubted whether the stability of the new technology was guaranteed, and now nearly a year later, the quality of the BYD DM-i family has also withstood the test of the market.
In the cold winter of last year, new questions appeared, whether this super hybrid system can still maintain good operation in winter? In order to verify how the plug-in hybrid model will perform in the winter, we borrowed a BYD Song PLUS DM-i super hybrid model in December and took it on a long trip of more than 1,000 kilometers to experience how the car performed in the cold winter.
It is true that under the current level of technology, the activity of the battery will indeed be reduced at low temperatures. Specific to the performance of the car is that the mileage is reduced, and the charging and discharging speed is slower, which may also bring about higher energy consumption. But this is mainly pure electric vehicles, for plug-in hybrid vehicles, the situation may be similar, but it will also be very different.
The first is the "big reservoir effect" brought about by large batteries. What is the minimum battery capacity required for a remix model? The Japanese Toyota, Honda and Nissan hybrids are equipped with only 1-2 KWH of batteries to run the vehicle. Taking BYD Song PLUS DM-i as an example, the low-end model is equipped with 8.3KWH, and the high-end model is equipped with an 18.3KWH capacity battery, which is several times higher than the non-plug-in hybrid model, and naturally has a larger "reservoir". Even in the cold temperature environment in winter, the battery capacity is attenuated, and there is still a sufficient supply of electrical energy.
In addition, in the process of driving the Song PLUS DM-i, we also found that BYD adopted a relatively intelligent battery discharge strategy. During normal driving, the vehicle's power management system does not allow the battery to be fully discharged, but also retains at least 10-15% of the power remaining. In other words, BYD's large reservoirs, even if they reach a "low water" situation, have more electricity than the Japanese hybrid. Using these electricities to complete the process of power hybrid is also completely sufficient. Further, Song PLUS also provides a battery forced power retention function, which can manually set the percentage of remaining battery power to keep the battery in a high-power state.
Secondly, BYD's exclusive battery heating technology can also alleviate the low temperature in winter. According to bydir before, the current large-scale use of its own "blade battery" also has a technology called "pulse self-heating". Through the rapid and ultra-high frequency charge and discharge of the battery itself, the battery heating is realized, which can be faster and more uniform than the traditional liquid cooling method. When others are still discussing that liquid cooling is better than air cooling, BYD has played a flower in the battery heating method, and also let consumers get a better experience.
Since it is a hybrid, in addition to the electric system, of course, there is also a fuel engine. In the first two years, everyone was troubled by the "oil dilution" incident of the hybrid engine, and there was some fear and resistance to the hybrid engine. Compared with pure fuel vehicles, the engine start time will indeed be less, in the cold winter, coupled with the short mileage of some consumers, it is likely to encounter the engine is not hot, people will be on the ground. Some of the gasoline that was injected into the cylinder wall was not completely burned and mixed into the oil, so the oil dilution problem occurred.
BYD Song PLUS DM-i's Xiaoyun 1.5L hybrid special engine has made a seemingly "cutting corners" design, which can actually improve the dilution of oil very well, that is, manifold injection. In the previous oil dilution incident, the "wet wall" problem of the cylinder caused by direct injection in the cylinder was the main cause. Manifold spraying, on the other hand, has a longer air mixing time, and the wet wall situation is greatly reduced.
So is the engine of manifold injection less dynamic and fuel-saving than the direct injection in the cylinder? For most vehicles, direct injection in the cylinder does have better engine performance. However, the situation of BYD's super hybrid system is slightly different, under the large reservoir effect of large capacity batteries, this Xiaoyun 1.5L hybrid special engine has abandoned the traditional engine needs to deal with the full working conditions of "full speed + full load". In most cases, this engine only needs a fixed speed + a single operating condition of a fixed load. The engine almost only needs to generate electricity efficiently, even if it is a perfect task. Under the premise of this work, the engine can completely "reduce the burden" on a large scale. Not to mention that this engine does not have direct injection in the cylinder, and it does not even need to be equipped with an exhaust valve timing system.
In addition, in general, the highest point of engine thermal efficiency will appear at medium speed, medium and high load, at this time the engine has a power output is actually not low, can relatively quickly complete the "hot engine" task, but also can reduce the occurrence of oil dilution.
For the everyday low mileage form, the plug-in hybrid Song PLUS DM-i can also be driven in pure electric mode. If the engine does not start, naturally there will be no organic oil dilution problems. If the driving range is long, the engine can maintain its own operating temperature with a large number of interventions, and it is not easy to dilute the oil.
During actual driving, it can be clearly felt that the engine has less starting time. However, once started, the engine is almost always operated in a set narrow range, and there are few cases where the engine needs to change the operating output on a large scale with different throttles. On the one hand, this can reduce the frequency of starting, and once started, it will try to generate a little more electricity, and also reduce the situation that the heat engine is slow and inefficient when running a large number of low-speed and low-load operation of traditional fuel vehicles. Specific optimization, this is the answer to the negative situation that BIA can solve in response to the traditional fuel engine.
During this long-distance drive in December last year, we drove this BYD Song PLUS DM-i model to experience the city driving of Wuhan and Beijing, and also experienced the long-distance driving distance of More than 1,000 kilometers from Wuhan to Beijing. During this trip, I did not discover the obvious difference between this Song PLUS and its summer performance.
In city driving, even after parking at night to completely cool down for one night, and driving for the first time the next day, Song PLUS did not have difficulties in starting. After the engine was started, it was not felt that it would produce more obvious jitter and noise problems than in the summer. At the same time, the vehicle can still maintain the advantage of low fuel consumption very well, when I finally returned the car in Beijing, I took a picture of the car's apparent fuel consumption display, and finally the average 100 kilometers of energy consumption is equivalent to 4.5 liters of fuel performance, I believe this will be a performance that can make everyone satisfied.