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2015 was a year of explosive growth of new energy buses. Faced with the new power systems such as batteries and motors, which are advancing, the old partners of the engine and transmission are not only envyed and hated, but also are looking for opportunities in the new energy vehicle market. . 
No, the transmission is now installed on pure electric buses.
Lifting the transmission, we all know that this is the standard for traditional fuel vehicles, but this configuration is rarely seen on pure electric buses. With the acceleration of the promotion of new energy buses, many new technologies have been applied. In October 2015, Zhongtong released the AMT version of pure electric passenger car. Afterwards, the topic of purely electric buses that did not need to install transmissions once again triggered the industry's discussion.
Draw a snake? NO! This is icing on the cake <br> <br> start talking about the working principle of the transmission. The transmission is a transmission that coordinates the engine speed and the actual travel speed of the wheels, allowing the engine to perform at its best. Pure electric passenger cars rely on electric motors and can output large torque even at low speeds and even at zero speed.
In other words, without a transmission, a purely electric passenger car can run as usual, and the fuel car will stop cooking.
Some people may say that if it does not affect normal operation, then if you add a transmission out of thin air, the cost will surely increase, and the weight will increase. Isn't it superfluous?
However, according to Nie Xingfu, deputy director of the Institute of Intelligent Transmission of the Institute of Automotive Transmission Engineering of Fast Automobile Group, it is necessary to install transmissions for pure electric buses.
"Pure electric buses plus a two-speed, three-speed or four-speed transmission can reduce motor torque, reduce motor costs, increase the degree of climbing and continuous acceleration, and optimize the efficiency of the motor." Nie Happiness told reporters: "Fals The company also devoted itself to the research and development of pure electric passenger car transmission. The F.ShiftAMT transmission of the new generation of products has been fully matured, and has passed more than 2 million kilometers of high temperature, plateau, alpine and mountainous areas and other conditions, road conditions and various load tests. At the same time, after long-term operation of the user, the technical performance and reliability of operation have been fully verified, and it has become the preferred configuration for upgrading the passenger car industry.â€
There are many advantages to install. "Most current electric buses on the market are not equipped with multi-speed transmissions. Because there is no deceleration and increased torque of the transmission, the torque output from the motor to the wheels is relatively small, resulting in a smaller maximum gradient of the vehicle, which is not conducive to road buses. In addition, through research on conventional electric buses, Zhongtong's technicians found that the efficiency of the motor can only reach about 50% in actual operating conditions, resulting in the inability of the unit to reduce mileage and affecting the driving range of the vehicle. However, if the transmission is equipped, these problems will be easily solved." Li Tongsheng, deputy director of the Corporate Management Department of Zhongtong Bus, told reporters.
What are the advantages of pure electric buses with transmissions? Li Shengsheng answered the question.
First of all, the intelligent shifting of the transmission can meet the driving conditions of multiple operating conditions, so that the driving motor is always maintained in an efficient operating area, effectively extending the driving range of the vehicle to more than 10%, and making the vehicle unit load quality index energy consumption far Less than 0.25 kWh/kilometer, fully reflects the good energy-saving effect of the vehicle. Secondly, through the speed-increasing and torsion-increasing effects of the transmission, while satisfying the vehicle with sufficient power performance, it can effectively reduce the power of the drive motor and the motor controller, and improve the operating efficiency of the motor system. As the power of the motor system is reduced, the peak discharge current of the battery system is also greatly reduced, and the requirement for the discharge rate of the battery is reduced, which can effectively improve the service life of the power battery system.
In recent years, the country's strong support for new energy vehicles has made the industry flourish and a hundred schools of thought contend. The manufacturers have begun to study how to better use new energy technologies.
“Zhongtong Passenger Cars was the first to introduce a pure electric EMT drive system that uses electric motors and AMT transmissions. This system has solved the shortcomings in the operation of pure electric buses,†said Li Shengsheng.
It is understood that the EMT system cancels the clutch between the motor and the transmission, cancels the mechanical synchronizer in the transmission, and uses the electric drive active synchronization instead of the traditional synchronizer friction passive synchronization, compared to the direct drive type power system, EMT Fully combines the output characteristics of the motor and the multi-transmission function of the transmission. The range of output torque and rotation speed can be expanded by changing gears to adapt to changing driving conditions. At the same time, the drive motor can work in favorable and efficient operating conditions. . Compared to direct-drive systems, EMT systems have significant advantages in terms of dynamics and energy consumption.
Oh good prospects <br> <br> say better to use a good, whether this market pay for it?
"Last year, we used the CMT AMT automatic transmission in some of our vehicles. Compared with traditional passenger cars, it has no shift levers and clutch pedals, and it can shift gears automatically. Like the automatic car, it greatly reduces Driver's fatigued driving can also save fuel consumption by 3%.†Zhang Qiyuan, director of the Beijing Passenger Car Group Co., Ltd. and passenger coach branch of Yilongda Automobile Repair Factory, told the reporter.
The S3-120AMT automatic transmission has served the Beijing Olympics, the Shanghai World Expo and other large events and has received high recognition from the industry. The relevant person in charge of caries stated that the S3-120AMT is suitable for a city new energy bus or bus chassis with a total length of 7 to 12 meters. It is connected directly to the main drive motor and does not require the use of clutches, enabling electric control of shift operation. Automation, its good economics and reliability are widely recognized by users.
"Currently, Zhongtong pure electric passenger cars with more than 10 meters basically use AMT automatic transmission technology. The models mainly include LCK6108EVG, LCK6108EV and LCK6117EV." Li Xiaosheng said: "In addition, vehicles under 10 meters in size such as LCK6808EV and LCK6850EVG are also used. The technology is currently sold in Tianjin, Tangshan, Zhongshan, Wuhan, Zhanjiang, and other markets, with nearly 1,000 units sold, with good market feedback and continuous follow-on orders, and 86 AMT versions from Weifang, Binzhou and Zoucheng in Shandong. Pure electric bus orders are in the midst of intense production and will soon be delivered to the market.â€
The increase in vehicle sales has also boosted the prosperity of parts and components. Nie Hsiang said that Fast has matched all major domestic OEMs, and the market demand is strong. Users reflect the high cost performance and there are new orders. In particular, the export of pure electric passenger cars is basically equipped with AMT automatic transmission, because foreign users are not accustomed to open manual transmission, he expects a rapid growth in the next few years.
"With the upgrading of pure electric buses, the application prospects of transmissions will be more and more broad. It is expected that there will be a big breakthrough in the next decade and the market will be huge," Nie said.