Why can't a diesel engine with extremely high power generation efficiency be used as a range extender?

On the premise that the efficiency of the motor drive and the weight of the vehicle will not change dramatically, if you want to save energy, another way is to start with the internal combustion engine, what we can see is PHEV and REEV, focusing on the gasoline engine track, but everyone seems to have forgotten about the diesel engine.

In terms of work efficiency, the diesel engine can be said to be the leading gasoline engine track.

In the era of fuel vehicles, it is said that Volkswagen's own TDI and TSI engines, TDI's fuel consumption can be said to crush TSI, a same Golf, diesel engine fuel consumption is less than 5L, gasoline engine Golf fuel consumption is about 7L is normal.

For example, the fuel consumption of the diesel version of the large G is only about 10L, and the fuel consumption of the gasoline version of the large G is stable at more than 15L.

So the question is, why not put such a high-efficiency diesel engine in today's PHEV or REEV technology route?

In my opinion, there are two main reasons, one is the foreshadowing of the existing technology, and the other is market acceptance.

For the domestic market, gasoline engines have dominated the development of 20 years, and our technical route has always been around the development of small-displacement gasoline engines, so the design and production of small-displacement gasoline engines matching PHEV and REEV technical routes are low cost and difficult to overcome.

Chery, GAC, Great Wall, Changan, Geely, BYD and other companies have a maximum thermal efficiency of more than 40%, and the cost is not high, after all, our technical reserves are sufficient.

But let's produce reliable, stable, excellent diesel engines, it is very difficult, after all, our industrial route, suitable for passenger cars diesel engines are very few, and major companies are not betting on this technical route.

To put it simply, the underlying diesel engine technology is not good enough, and the technical pressure on the production of special diesel hybrids is not small.

In addition, diesel engines have never been popular in the domestic market, as a strategic energy source, the supply of diesel in the past is limited, and the concept of instilling more users is that diesel engines are polluting, noisy, and the driving experience is similar to that of tractors.

In addition to the fact that we don't have enough diesel engine technology as I said above, it is actually to avoid a large amount of diesel from flowing to the market for family cars that cannot produce high value.

The limit of diesel engines is very high, but there are very few companies that can produce high-standard diesel engines, and anyone who has driven a TDI knows it.

So it's not that diesel engines can't be used as range extenders, on the contrary, it's completely possible, but technology, cost, diesel label supply, and most importantly, emissions are the core keys to restricting the current production of diesel PHEVs and REEVs by Chinese companies.

Its practical diesel engine is very good as the infrastructure for PHEV and REEV.

The power generation efficiency of gasoline engines is generally 3.3 kWh/L, and the power generation capacity of diesel engines is 20%-30% higher.

However, it is a pity that the current Chinese companies with fierce electrification process do not have a clear banner of diesel engine technology, so in terms of adapting hybrid technology, gasoline engine is the best choice, and the domestic environment does not allow diesel engines.

In the final analysis, it's not that the diesel engine can't work, but that the current gasoline engine is enough, after all, the core route of the future and EV have already abandoned the internal combustion engine, so why bother to break through the barriers of diesel engines?