Environmental pressure exerts pressure on the development of new energy vehicles. Not only in the automotive industry, but also in the general public, new energy vehicles have become widely recognized. For passengers, they are concerned about the safety, environmental protection and comfort of new energy vehicles; for major manufacturers, competition is the core competition of new energy vehicles – power system technology; for operators and driving new energy Bus driver drivers, in addition to paying attention to the safety and stability of new energy buses, also pay more attention to whether the power to meet operational needs.

Hybrid power, plug-in hybrid power, and pure electric power are the three main powertrains currently in operation in the market. Which kind of powertrain is both powerful and has market operation promotion value?

Pure electric hybrid outdated <br> <br> not yet mature hybrid technology first appeared in the late eighties, dating back more than twenty years. Today's oil (gas) electric hybrid models, although significant fuel savings, but its power plant is still based on gas (wood, gas) oil machine, electric system is only auxiliary, and there is lack of power uphill problem. Last year, the government attributed it to the ranks of energy-saving vehicles, not as a new energy vehicle. The focus of the state's encouragement has shifted to pure electric vehicles and plug-in hybrid vehicles.

Haig plug-in hybrid bus structure diagram <br> <br> say pure electric vehicles, as a major future direction of development, Tesla, Nissan Ling-feng and other electric vehicles have brand-Tau Kok early, but in actual use Among them, the disadvantages such as high cost and short cruising range have been exposed, and the industry generally believes that these technical problems are difficult to overcome in the short term.

Chen Guangzu, a senior expert in the domestic automotive industry, said: “The current global electric vehicle industry is still in a transitional period. The safety issue is also improving. Although Tesla’s outstanding performance is an advanced electric vehicle product, it is also ineffective. Open the transitional application platform."

Plug-in hybrid the most powerful new force in this lean <br> <br> the time, there is a technology in a timely manner appear - plug-in hybrid, which addresses the high cost of electric vehicles problems, but also solve the pure The problem of short range and inconvenient charging of electric vehicles has the greatest market potential.

“Last year, our new energy buses sold a total of more than 940 vehicles. In January this year, we also sold nearly 50 plug-in hybrid buses, leading the growth rate in the industry,” said Zhang Weilin, director of the Hager New Energy Research Institute. Different from pure electric vehicles, plug-in hybrid vehicles are usually powered by pure electric power. If necessary, the gas (chai, gas) oil engines can be put into operation. This avoids the breakdown caused by the lack of electricity in pure electric vehicles. At the same time, it It can be charged by the generator itself or it can be charged externally.

Zhang Weilin told the author that as a leading company in new energy vehicles, the plug-in hybrid bus launched by Hager Bus has also taken into consideration more details on driving and further improved the driving experience. For example, the use of an electric power assist system allows the driver to easily operate the vehicle while the engine is stopped, avoiding the disadvantages that the other hybrid vehicles do not have steering assistance at low speeds and the driver has a high degree of operational strength.

ISG sophisticated hybrid transmission efficiency higher <br> <br> to maintain a strong momentum, in addition to taking the best of the new energy mix mode, the vehicle's own hybrid system is also critical. At present, this type of vehicle in China mainly uses the BSG hybrid system, that is, the belt-driven generator. The more advanced ISG hybrid system is that the motor and the engine directly drive the driving wheels of the vehicle. The gearbox is not required for power transmission and torque transformation in the middle, which reduces the loss of the transmission system to the power and has higher transmission efficiency.

It is understood that with the ISG hybrid system, there are only two new energy buses in China. Haig's plug-in new energy bus is one of them. This cutting-edge technology power system makes vehicles even more powerful. For example, a 100-kilowatt electric motor, through BSG power transmission, has a belt driving force attenuation of only about 40 kilowatts, and cannot meet the requirements of continuous climbing, but the ISG method has a high power transmission efficiency and can be converted to 850 Nm. The big torque. ”

"What is the concept of 850 Nm? This is equivalent to a 190-horsepower diesel engine, which solves the problem of the general lack of power in the BSG system." Zhang Weilin told the author, now Haig's plug-in hybrid electric vehicle pure electric output torque Up to nearly 3000 Nm, equivalent to more than 460 horsepower, this is enough to ensure the new energy buses' strong driving force and climbing ability.