Whether it is fuel cell or what other way, and ultimately converted to electricity to drive the future direction of the development of the car. But to see the introduction, now Tesla as the representative of the pure electric vehicles, are only the engine replaced by the motor, still use the gearbox for power transmission. I think why not use four sync or stepper motors to drive four wheels directly? This eliminates the gearbox and the clutch directly. And then by the car computer precise control of the four wheels of the speed and torque, than what timely four-wheel drive, double clutch what is not too strong?
Although the list of many advantages and disadvantages, but I have always thought that a good new technology can not be promoted, the biggest problem on one: the cost.
Advantages Needless to say, through the electronic control can achieve differential, but also can achieve four different allocation of grip (similar to ESP and TCS fit, but not control the inner wheel brake, but direct control motor torque output ), And you see how cruel the data ah, a single motor 27kw, so a car has 108kw, up to 146 horsepower, equivalent to a 12 Buick Regal 2L naturally aspirated engine.
Said the simple word, cost. Most of the research and development of electric buses have national financial support, for example, a car company took a project 60 million countries, but small cars do not have this blessing. That complex, that is, technology, but off.
First of all, now, there are some car companies have launched a double-wheel motor-driven electric bus (note that the bus), such as BYD K9, has been running in the streets of Xi'an. But only the promotion of the bus. Four-wheel drive or a small car, are not put on the market.
