Among plug-in hybrid, pure electric hybrid and oil-electric hybrid, plug-in hybrid has the lowest technical difficulty.
almost all the patented technologies involved in electric hybrid are controlled by Toyota and Honda in Japan. The difficulty and cost of research and development in this field also forced Audi, BMW and other car companies to abandon the development of electric hybrid vehicles and directly turn to pure electric or plug-in hybrid vehicles.
At present, the most famous brands of pure electric vehicles in the world are Tesla, BYD, BMW, etc., and the technical difficulty of their R&D and manufacturing is not less than that of hybrid electric vehicles, especially the three core technologies of pure electric vehicles: electric drive system, battery system and electronic control system.
among the three core technologies of pure electric vehicles, the management technology of battery system may be the most difficult. If this model is not well controlled, the pure electric vehicle will bring the fear of spontaneous combustion and explosion to the owner in a few minutes.
Plug-in hybrid electric vehicle combines some characteristics of pure electric vehicle and traditional fuel vehicle, but it seems to add the electric drive system of pure electric vehicle, but this electric drive system is very different from pure electric vehicle.
The fuel drive system and electric drive system of plug-in hybrid electric vehicle are two completely independent systems, which can realize independent switching between fuel drive and electric drive. The plug-in hybrid electric vehicle mode is more like a charging drive system, which charges the battery after the engine does work, and then drives the vehicle after switching to pure electric mode.
that is to say, a plug-in hybrid vehicle only needs to do a good job in battery management of the electric drive system and a set of controllers that can be freely switched between fuel drive and electric drive, and a plug-in hybrid vehicle is completed.
Therefore, when the plug-in hybrid vehicle runs in pure electric mode, it is no exaggeration to say that it is a super-large "electric toy vehicle".
the difficulty of plug-in hybrid power is mainly the switching logic between fuel and electric drive, and how to ensure that the engine can provide the best charging efficiency for the battery.
to sum up, after understanding the working principle of plug-in hybrid, we can know that under the background of today's lightweight design of automobiles, plug-in hybrid needs to ensure a complete set of structures such as engine, gearbox and transmission system of traditional fuel vehicles, and then install a battery management group on this basis.
in this case, if the battery management group is too large, it will inevitably increase the overall weight of the car, which is one of the reasons why plug-in hybrid vehicles are often heavier. In this regard, the fuel consumption of fuel-driven plug-in hybrid vehicles will actually increase.
However, smart car companies still have ways to solve this problem by reducing the size of fuel tanks and battery management groups. So the working principle of plug-in hybrid determines that its battery life will not be too high.
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