BYD's DM-i series models are based on economic and fuel savings as the biggest selling point. A+ class sedan Qin PLUS DM-i, the official power loss fuel consumption of 100 kilometers 3.8L, Song PLUS DM-i power loss fuel consumption of 4.4L, Tang DM-i power loss fuel consumption is only 5.3L. Fuel consumption is so low at the same time, but still able to achieve a power level that does not belong to the same level of 2.0T, which can be called a subversive revolution in automotive industry technology.
BYD's official power loss fuel consumption is not equivalent to the Ministry of Industry and Information Technology's NEDC fuel consumption, many riders can drive out, in the BYD cloud service, even many riders are lower than the official data, Qin, Song PLUS to open 3L or less is also everywhere. However, this winter, some friends in the north said that below zero, the fuel consumption of DM-i series models is not so low, including the recent "200,000 Hybrid SUV Horizontal Review" made by a car emperor. It also measured the fuel consumption of the Song PLUS DM-i close to 7L.
The question is, is the Song PLUS DM-i really not fuel-efficient in winter, or is there a problem with the driving mode?
First, the concept of equivalent fuel consumption:
Fuel consumption data of a car emperor: In the fuel consumption test of urban 121Km, high-speed 72Km, and average speed of 41Km per hour, BYD Song PLUS DM-i has three results, namely:
The starting power is 11%, the fuel consumption is 6.73L, and the remaining power is 25%.
The starting charge is 25%, the fuel consumption is 6.59L, and the remaining power is 24%.
The starting power is 100%, the fuel consumption is 3.59L and 6.77 kWh.
In fact, for plug-in hybrid models, there are two ways to replenish energy, and it is more accurate to describe it with energy consumption. The two energy replenishment methods correspond to the consumption of two energy sources, and we often see data like this in the apparent energy consumption: 3.56 liters of oil + 6.77 kWh, or even 7.1 liters of oil - 6.3 kWh. This is not convenient for calculation and comparison, so the concept of "equivalent fuel consumption" will be introduced, and 3 kWh of electricity will be equivalent to 1 liter of oil, which will be converted into fuel consumption and compared with the same level of fuel vehicles and HEV hybrids. Because plug-in hybrid models generally 1L oil can generate 3 kWh of electricity.
If we introduce the concept of equivalent fuel consumption, and then look at the evaluation data given by a car emperor, we will find that the fuel consumption data of the three tests is very different:
11% of the electricity charged to 25%, means charged 14% of the electricity, Song PLUS DM-i flagship total electricity of 18.3 degrees, that is to say, charged 2.56 degrees of electricity, then this time the energy consumption is 6.73L-2.56kWh, the 3 degrees of electricity into 1L oil, the equivalent fuel consumption of 5.88L. Because the charge of 2.56 kWh of electricity can also allow the car to continue to run for 20 or 30 kilometers, it will inevitably pull down the fuel consumption of 100 kilometers.
25% of the electricity, used 1% of the electricity, then the equivalent fuel consumption is 6.65L.
100% power, 3.59L+6.77kWh, equivalent fuel consumption of 5.84L.
A car emperor evaluation, why not quote a more professional "equivalent fuel consumption" concept?
Second, the working condition analysis:
You may wish to think about it, three different initial power conditions, ideally, which one is the most fuel-efficient and which one is the most fuel-intensive? (Equivalent fuel consumption) Intuitively, it should be 11% of the power deficit state is the most expensive, because more secondary energy conversion, there will inevitably be waste. The 100% power is the most fuel-efficient, because the full oil is fully charged, the margin is the largest, and it can be relatively free to choose. Not really: we need to analyze different situations:
1, 11% of the initial power: In fact, in general, Song PLUS DM-i, the power can be used to 11% only one situation - almost home, and the home can be charged. If there is no charging pile, if the owner's brain is not wrong, it is impossible to use forced EV to drive the power to such a low level, because low power force EV will limit power and speed, normal people will not do so.
And even this kind of electricity, in the low-speed state of the city, the energy consumption will not be too high, because at this time DM-i will enter the range-extended mode, the engine will generate electricity in the most economical conditions, the power supply machine will drive the vehicle, and the remaining power will charge the battery. Therefore, even if the electricity is only 11%, the electricity will quickly increase to 25% in the urban area.
However, if the big foot throttle at this time, or has been driving at high speed (high load), energy consumption will be significantly increased, because in order to provide enough power, the battery is low, it can only pull up the number of engine revolutions, out of the economic working area, will inevitably lead to a decrease in efficiency, fuel consumption increased. However, as long as this high load condition is passed, the engine will return to the economic rotational range and the efficiency will return to normal levels.
2, 100% initial power: full power state, the cost of the car is definitely the lowest, but the efficiency may not be the highest, because the price of electricity is cheap, and the price of oil is expensive, manufacturers will also consider this when calibrating the working conditions, so full power will inevitably give priority to electricity. However, in the winter, the warm air is first turned on for pure electricity, so that the power is greatly consumed, and then the engine is started to charge, which will cause waste. It can be seen that the equivalent energy consumption of 100% power is actually not the lowest.
In addition, the test results, in the full power state, the energy consumption is 3.59L oil + 6.77 kWh of 100 kilometers, which does not indicate whether it is the apparent energy consumption or calculated by the fuel added and the remaining power percentage. If, like other models, is calculated by the amount of fuel added, we can reverse the total mileage of 193Km, adding a total of 6.93L of fuel throughout the process, so how is 6.77 kWh calculated? The ideal situation is the same as oil, with the charging pile to fill the electricity again, calculate the amount of charging, but this practice is difficult, it is unlikely to charge directly at the gas station, if you drive to other places to charge, it is difficult to ensure that the power is consistent.
So, the test result, 6.77 kWh of electricity is calculated by the percentage of electricity, then we can reverse the remaining power after the test ends. 6.77 degrees per 100 kilometers, ran 193 kilometers, a total of 13 degrees of electricity. At the end of the test, the remaining power was 29% at the time of refueling, much higher than 25%.
When calculating the equivalent fuel consumption, it does not matter how much electricity is left, because more electricity is less oil, and less oil is used. But later, a certain car emperor calculated the cost of a car... This is very unprofessional.
3, 25% of the initial power: start 25%, end 24%, basically can be considered pure oil driving, the engine almost the whole start, no need to use pure electricity to open the warm air. In fact, if it is a smart power preservation, calculate the equivalent fuel consumption, this working condition is the most fuel-efficient.
Of course, it's okay to want to drain the fuel, as long as the big foot throttle and then slam on the brakes. The average speed of the same 41Km per hour, the highest 130Km, the lowest 1Km creep can also be averaged out, the highest 90Km, the lowest 30Km can also be averaged out. But the fuel consumption gap here, I think people who can drive understand, right?
Third, what factors determine fuel consumption? How should the DM-i model be driven?
I am personally an old Tang car owner, said on the Internet that it is the first generation of Tang 80 oil tigers, I have driven the equivalent fuel consumption of the beginning of 5 at the beginning, and when I go downhill, I have negative fuel consumption. However, the highest, 100 kilometers 17L of the table equivalent fuel consumption is also a common thing, very simple, pure electricity in winter to open the warm air and other people, the mileage is unchanged, but the energy consumption is rubbing up.
At that time, the apparent energy consumption of the meter was 54 kWh of electricity per 100 km, and the average energy consumption of 100 km (the last 50 Km) was 18 liters of oil if it was equivalent to oil. In fact, I didn't use 1L of oil, and I didn't actually use that much electricity, because I didn't drive 100Km in that situation. Just turn on the air conditioner in situ, so that the energy consumption is "averaged". And I don't need to charge those electricity with oil.
In addition to using pure electricity in situ to open the warm air, the driving style also has a great impact on fuel consumption. I used to go to riders' clubs, the same car, the same road, the same speed. I showed 8L of oil, and the buddy in front of me was 12L, and the gap also scared me. Therefore, the fuel consumption of this thing, look at the evaluation is really not as good as looking at the data of the Ministry of Industry and Information Technology.
Now the DM-i model, compared to my old Don, is much smarter and much simpler. As long as you don't deliberately kick the throttle and run to save fuel, then the equivalent fuel consumption of about 5L per 100 kilometers is no problem. It will increase in winter, but it will not exceed 6L – here you can refer to the previous 11% test fuel consumption data, the equivalent fuel consumption is 5.88L. Of course, the extreme cold of minus 30 degrees will lead to a decrease in charging efficiency, battery insulation will also have a non-negligible waste of energy consumption, fuel consumption will be further increased.
DM-i models, as long as two operating conditions are avoided, the fuel consumption will not be too high. The first is pure electric open warm air. If you're easy to charge and the road is short, it doesn't hurt. As long as pure electricity comes back, then even if you show 50 degrees of electricity, the 100 kilometers are equivalent to 25 yuan - in fact, you only drove more than 20 kilometers, and only spent five or six dollars, which is more economical than fuel vehicles.
If it is not convenient to charge, then try to use the residual temperature of the engine to heat up and avoid waste. In operation, first use the hybrid mode, while making the SOC higher than the current power, so that even if you are slow and the load is small, the engine will always work, charging the battery and heating the crew compartment at the same time. Wait until you are almost at your destination, then switch on pure electricity and turn off the warm air. The residual temperature in the car is enough to reach the destination, and this part of the journey can take advantage of pure electricity, even in winter, the fuel consumption will not be too high.
The second is to pay attention to the power protection mode, whether it is intelligent power protection or compulsory power protection, the working logic of the two modes is not static, I heard that the latest OTA upgrade, the logic has changed - in short, the manufacturer will also upgrade the logic according to the feedback of the owner, but at present, its underlying logic is generally like this:
Intelligent power protection pursues economic and energy saving, try to let the engine charge the battery with redundant power under the economic number of revolutions, but the return is relatively slow, and sometimes in the case of large loads, even can not keep the power.
Mandatory power preservation is the opposite, the economy to make concessions for the power reserve, efficient charging, but does not guarantee that the engine will work under the most economical conditions. The battery will certainly be retained, but the fuel consumption will also increase.
Therefore, if you want low fuel consumption, you should be cautious about using forced power retention, as long as you do not need high power so urgently, try not to use forced power protection mode. Especially in high-load situations such as high speeds and uphill climbs.
In addition, the speed is also closely related to fuel consumption, on the high speed, you drive 130Km, it is definitely more expensive than driving 110Km. And it is not suitable for power preservation. This is actually a matter of choice, speed or fuel saving. In fact, the hybrid car saves fuel, mainly to avoid the waste of ordinary fuel vehicles at low speed, at high speed, the engine also works in the efficient range, and the hybrid model is not more fuel-efficient than the fuel vehicle.
Finally: the so-called fuel consumption test under normal circumstances, there are too many articles that can be done. If you really want to see which car is more fuel-efficient, it is actually better to compare the official fuel consumption of the Ministry of Industry and Information Technology. Although some are out of touch with reality, at least human intervention and some accidental factors are excluded. Indeed, the fuel consumption of the Ministry of Industry and Information Technology of the plug-in hybrid model is 1L, 0.8L, and it cannot be opened, but from the perspective of car cost, if it can be charged, it is really almost the same.
Fuel consumption itself is a problem for ponies to cross the river, and different driving styles, road conditions, speed, and load will have an impact on performance. If others can drive 4.4L of fuel consumption, and you drive close to 7L, then the probability is not the problem of the car, but your problem.