However, BYD DM-i hybrid system has taken another road, using E-CVT as the power shunt device. In fact, E-CVT has nothing to do with mechanical CVT gearbox. Although Toyota and Honda have different control methods for E-CVT, in general, it is used as a power distributor.
It has no physical gear, but determines when to use electricity, when to use oil, when to use oil and electricity together, and what is the ratio by adjusting the speed of the engine and motor.
Its advantage is obvious, that is, as long as it is well controlled in theory, the distribution of oil and electricity can be scientific enough to realize energy saving to the greatest extent. The disadvantage is that the thinking is simple, but the control is very complicated.
It's too complicated. Toyota has published many patents, but almost no manufacturers have followed up, because it is difficult to achieve similar results. Therefore, BYD suddenly "became a monk halfway" to build an architecture with E-CVT as the power shunt device, which has no experience accumulated. Honestly, it's not good.
Development momentum of hybrid electric vehicles
With the rising oil price in recent years, more attention has been paid to environmentally-friendly cars. The technical route of new energy vehicles has been discussed a lot. It is generally believed that the development of hybrid vehicles is more suitable for the actual situation in China than the development of electric vehicles.
Hybrid power technology is a market-oriented development trend, because it combines the advantages of internal combustion engine and electric vehicle, which can obviously reduce emissions and energy consumption.