From the perspective of the efficiency conversion process, every conversion of energy has “waste”, and the less the conversion process, the more efficient it is. The former is chemical energy→mechanical energy→electrical energy→mechanical energy, which roughly undergoes 4 energy conversions; the latter is chemical energy→mechanical energy, which undergoes roughly 2 energy conversions.
From this point of view, the traditional fuel power has fewer energy conversions and should be more efficient, but the problem is that each energy conversion also considers the actual efficiency and actual working conditions.
Although the energy conversion of traditional fuel power is small, the thermal efficiency of the engine is generally not high. It is very efficient if it exceeds 40%, and it is difficult to maintain it for a long time. Especially in the urban area, the actual efficiency may be less than 30%, which is serious. It is not bad that the overall power can reach 35%.
The advantage of the extended-range power is that even in urban conditions, the engine is still in the best working range (generally around 40%), continuously and efficiently using gasoline to generate electricity, while the efficiency of the electric motor (electrical energy into mechanical energy) is generally higher than More than 90%, 95% is the normal state, so the comprehensive power of the extended-range power can reach more than 37%.
However, under high-speed conditions, the efficiency of traditional fuel power can be maintained at a high level and can run farther. Therefore, some plug-in hybrid systems adopt the fuel direct drive mode under high-speed conditions.
On the whole, under urban working conditions, the power efficiency of the extended program is higher, and it can run farther; under high-speed operating conditions, the traditional fuel power is more efficient, and it can run farther; under the comprehensive operating conditions, the advantage of the extended program power is greater. Some.
Of course, just like cooking, even if the recipes and ingredients are perfect, it depends on the skill of the cook, and it is not ruled out that the efficiency of some extended-program hybrid models is not high.
In addition, this does not mean that increasing the program is environmentally friendly. After all, the main energy source is still from fossil fuels or gasoline, and the high-speed mode does not save fuel at all.
In contrast, pure electric vehicles are more energy-efficient and environmentally friendly.
Compared with gasoline engines, electric motors are “emotionally” stable, more energy efficient, and more energy efficient. As for energy sources, although coal is currently used for power generation, power production has been diversified, and the proportion of clean energy including wind power, hydropower, and photovoltaic power is gradually expanding.
Compared with pure fuel vehicles, the extended-range power is more fuel-efficient in urban areas, and there is no anxiety about battery life. It does have certain advantages.
In the future, the decline in the market size of pure fuel vehicles is inevitable.
However, the extended-range power can only be connected in series, and cannot be connected in parallel, and the fuel consumption of power feeding is relatively high, so it can only be used as the current transition technology.