做出來大概率你不敢坐，反正我是不敢坐。

In fact, the reason is very simple, mainly the space layout problem, the average large five-seater SUV, the upper mileage limit of CLTC is about 450-0km.

Because a large part of the chassis is occupied by the fuel tank, and if according to our standards, there must be a physical space between the fuel tank and the battery, and the height direction is not allowed to overlap. At present, even many cars that have only achieved 300km pure electric range have already overlapped the battery pack and fuel tank in the height direction.

So a lot of people have mentioned, so what if I switch to a small range extender?

The power consumption of a five-seater SUV is only 28 kWh/0 km at worst, and it may only be 0 kWh/0 km if the weather is good. Logically, then, as long as I have a 0kW range extender assembly that is generating electricity all the time, it must be enough.

In the case of 1kW, only a 0-liter engine is sufficient.

But here are two more things that prevent this from happening:

1. Problems with user experience. On the one hand, the noise is obvious at low speeds, and the performance of reducing the speed is not enough, on the other hand, a large part of the power of the small engine has to go in and out of the battery, and there is an additional energy loss.
2. Regulatory issues. China's regulations do not recognize the term "small range extender", and the small range extender suffers very much when carrying out energy consumption and emission tests under power loss conditions in accordance with regulations.

That's why we still need a right-sized engine. In addition, if you already have more than 70 kWh, it is recommended that you buy pure electricity directly. It would be a waste to buy an engine, a generator and a fuel tank with such a heavy load.

When I met with Yiran some time ago, he asked me this question, and then my idea was that maybe in the future development of regulations, we can think about how to make a reasonable plan for the expansion of small range extenders.

If there is, the engine is not necessarily the type of engine you see, but the free piston's power generation integration or free rotor special engine, which focuses on power generation.