In the development of electric buses in China, some people have proposed the plan of “curving overtakingâ€, but as time goes by, this theory has been questioned. Can “curve overtaking†on electric buses be realized? Will he be more risky than opportunity or opportunity greater than risk?
"Curve overtaking" is a term used in motorsports, meaning to use curves to overtake each other. When the competitors are flying on the straight track, because the level is basically the same and the speed is almost the same, it is difficult to complete the overtaking on the straight track. Only when entering the corner to slow down, it is possible to surpass the opponent by driving skills and courage.
Nowadays, the theory of “over-the-road overtaking†has become the “development strategy†of pure electric buses in China and has been sought after. The basis is: "China's electric vehicles are almost on the same starting line as developed countries, laying a technical foundation for a new round of competition in the world's auto industry and achieving leap-forward development."
For example, Professor Yu Datai from Beijing University of Science and Technology believes that at present, there is no technology that can attract the attention of governments, enterprises and consumers all over the world like new energy. There is no technology like pure electric vehicles. Similarly, it is called the "China Auto Industry Curve Overtaking" the best opportunity.
But the real problem is that the curve that the electric bus faces is not the set curve line on the race track, but the hard-hitting technical level and the most difficult road segment in the market competition. Just as Dong Yang, executive vice president of the China Association of Automobile Manufacturers, revealed at the third meeting of the China Machinery Industry Federation at the beginning of the year, there are many problems in the development of pure electric vehicles in China: "The whole vehicle product continues. Driving mileage, reliability and engineering still lag behind foreign advanced products; battery safety, reliability, service life, etc. can not meet the requirements of the vehicle; some parts and materials required for motors and batteries need to be imported, and the controller Basic hardware, chips, high-speed CAN gateways, and signal processing amplification components are also dependent on imports; electric accessories are not yet available in mature products, costly and dependent on imports."
So many problems, such difficult technical obstacles, such a high degree of dependence on imported parts, so that although electric vehicles have been engaged for many years, they have been slow to enter the market, but have entered the market. It’s also a lot of questions...
“Curving overtaking†is an opportunity, but also a risk and a challengeIn competitive racing, the curve needs to be decelerated. It is necessary to prevent the vehicle from slipping out of the track by increasing the turning radius. At this time, if the driver has sufficient ability, the use of the curve is often the best chance of overtaking. However, the opportunities for competition are equal. This overtaking corner that can be used is the most difficult driving section on the circuit. For the racer, it means the opportunity to surpass the opponent, which means the road to success. But it means more risk, which means challenge, which means failure, including falling behind and going out.
Out of interest in racing sports, the author has checked some basic skills that should be available for overtaking on the Internet. The following elements are indispensable:
(1) Must have the ability to lead. The premise is that the acceleration performance and the maximum speed are almost the same as those of other racers, and it is difficult to win or lose on the straight track. Otherwise, even if the adventure is over in the corner, it will not become a front runner after turning into the straight.
(2) The direction should be correct. The “travel overtaking†trajectory is more important than speed. For example, from which direction and at what speed? The direction should be stable and the route should be correct.
(3) Speed ​​should be appropriate. Beyond the curve needs to control the speed. If it is too slow, it will not be able to surpass it. If it is too fast, it may go in the wrong direction. Therefore, the proper speed is an important part of the curve beyond.
(4) Be brave and conscientious. "Curving overtaking" requires courage and also requires strategy. Compared with the courage, precise operation, skilled technology and driving strategy are the guarantees of cornering beyond.
(5) Safety first, keep the mentality stable. Overtaking is first safe, no safety, and everything else is zero. Being brave and facing a stable attitude is an important guarantee for safety.
Can we really "turn over the road"?Since we are discussing the development of China's electric buses, we must pass the "curve overtaking" skills to force the group, then the experience on the competitive sports field must have a certain reference value, from several aspects.
"From a technical point of view, the battery and electronic control technology of pure electric vehicles still have not passed." In this regard, Song Jian, executive vice president of the Automotive Engineering Research Institute of Tsinghua University, said: "Pure electric vehicles need about 20 degrees of electric drive, hybrid power only needs 1 degree. When the battery storage capacity increases dozens of times, the battery The security issue is exposed."
Regarding battery performance and cost, Japan, which is leading the world in battery technology development, proposed that the energy density of a power battery developed in 2030 is equivalent to 7 times that of the current state, and the cost of the battery is equivalent to 1/40 of the current. Can make such a simple comparison, that is: if the performance of the battery is increased by 7 times, the quality, volume and driving ability of the vehicle battery will have an improvement of 7 times the current level; if the cost is reduced to the current 1/40, It is equivalent to the electric bus battery from the current vehicle 600,000 yuan to 15,000 yuan, reaching the market application level. At present, no encouraging development plans have been heard in China.
And more obstacles come from users. Although there are national new energy subsidies, the cost of vehicles is still too high, and the subsequent operating costs are also alarming. Although pure electric vehicles can be seen in some major events, the relatively passive spectator posture of users has made the marketization of domestic electric buses a "slap in the air". Director of the Guangzhou Municipal Transportation Commission, Mr. Gong Yilong once asked on behalf of the user: the first purchase of a pure electric bus country for each subsidy of 600,000, according to the current service life of at least 8 years, at least one battery replacement, that is, each The car has to invest an additional 600,000 yuan. Where does the money come from? Where is the cost going? So far, no clear answer has been found. These questions are not clear, how can we talk about the market prospects and rapid and healthy development of electric buses.
ConclusionIt seems that the development opportunities of electric buses are not in the corners, and the transcendence is not in the corners, and the winning wins are not in the corners. If you don't have reliable battery power and optimized high-efficiency electronic control technology, you can't be a front-runner by playing tricks and risk-taking to "curve overtaking". The "curve overtaking" grabs the limelight and may soon disappear. fast. As some technical authorities have pointed out: it is meaningless to emphasize the same starting line. As for the overtaking of the curve itself is wrong, the overtaking of the curve is a dangerous behavior, we should develop well and steadily...
The development of new energy buses is from a process of reducing carbon from “4/4C→3/4C→2/4C→1/4C→0Câ€, that is, by reducing the dependence on traditional fuels, and finally achieving pure electric drive. The development and progress of power battery and electronic control technology should be evaluated on the hybrid bus by gradually increasing the electric power ratio (light mixing, medium mixing, heavy mixing), continuously improving and improving, reserve technology, and gradually develop. Up and above the international level.
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