·The traditional technology of passenger cars has been marginalized

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In the past two years, domestic new energy buses have developed rapidly, and news on the sales of hundreds of new energy buses in a single order has emerged one after another.

As we all know, the new energy bus is "new" in the power drive system, namely the battery, motor, and electronic control. When bus companies concentrate a large part of their attention on the "three powers", what will be the traditional technology and technology of passenger cars?

Bus traditional technology is ignored

“Generally speaking, we classify technologies other than the 'Three Powers' system as the traditional technology of passenger cars.” Qi Zhihao, senior technical consultant of the China Highway Society Bus Branch, explained to reporters, “For example, the driving system, braking system and active and passive of passenger cars. Safety technology, body structure, reliability, comfort, lightweight, etc."

Some industry experts believe that some bus manufacturers focus on the research of the "three electricity" system, ignoring the improvement of traditional technology and technology of passenger cars. In particular, companies that have entered the passenger car manufacturing field in recent years have inevitably experienced insufficient experience in manufacturing passenger cars and accumulated insufficient technology.

"To build a new energy bus, you can't just focus on the 'three power' system part. The traditional bus technology is also very important. For example, whether the suspension system makes the occupants feel comfortable, whether the layout inside the car is reasonable and convenient, and whether the handrail design on the car is humanized. "Zhi Zhihao told reporters, "Some bus companies have insufficient attention to the traditional technology and process of vehicles. There are still many unreasonable designs in these aspects."

Some insiders said that some new energy buses in China only replace the engine with an electric motor. The overall technical level of the vehicle is not much different from that of the traditional bus. Some new energy bus passenger cars are still in the form of multi-level stepping floors, fitted with leaf spring suspensions, and even the fire extinguishing devices that should be installed are omitted. Such problems reflect the neglect of traditional technology and technology by bus companies.

Wang Jian, a public transportation scholar at Chongqing Jiaotong University, said that some bus companies did not focus their research and development on the bus manufacturing itself, but on receiving subsidies. Traditional buses, as long as they are equipped with batteries, become new energy buses and can be subsidized. Therefore, technological advances outside the “three power” system are often overlooked. He believes that the role of modern bus passengers is to better meet the needs of public transport services. From this perspective, many new energy buses are still lacking.

In addition, Wang Jian also told reporters that international research on the lightweight of passenger cars has always been a hot spot. The new energy bus can adopt composite sandwich panels, and adopt aluminum, carbon fiber, glass fiber and other outer coverings according to the required strength, rigidity and toughness of the vehicle body.

“Lightweight has great advantages in reducing costs. The composite body can reduce the cost of the body by at least 20%. A 12-meter bus can reduce the weight by about 3 tons if it uses carbon fiber material.” Wang Jian said, but domestic In the passenger car market, there are not many bus companies that research composite materials.

Zhang Haodong, general manager of Shaolin Bus, said that although most bus companies can produce new energy buses, the quality and quality of vehicles are uneven.

“New energy buses have higher requirements than traditional power buses. Some companies that did not produce cars before, or those that used to only produce modified cars, have launched new energy buses. Some of these companies seem to only care about whether vehicles can reach them. The prescribed standards, in terms of welding, painting and other process details, may not require very fine." Zhang Haodong said.

Ren Shifa, a veteran of the bus industry, pointed out that the doors of some new energy buses are not designed to be large enough to meet the requirements of urban buses for the rapid opening and landing of vehicles with large doors. The design of driver seats is unreasonable, space is small, and humanization is not enough. The situation does exist. “At present, many bus companies only focus on the research of new energy technologies.” Ren Shifa said, “In fact, new energy technologies and traditional bus technologies should be both hands-on and hard.”

Traditional technology has broad application prospects

The importance of traditional bus technology should be paid more and more attention by enterprises. Xie Yong, director of the Technical Center of the Hager Bus Light Vehicle Division, told the reporter: "Although the sales of traditional power light passenger products have declined due to the promotion of new energy vehicles, the traditional power light passenger vehicles still have a large market space. ”

At present, the new energy bus is not fully equipped due to the charging facilities, and the mileage of pure electric buses cannot be completely solved. Moreover, the reliability and price of new energy buses are quite different from those of traditional energy buses. Grasping the market of traditional energy buses, companies still need to continue to study traditional bus technology.

In addition, if there is no major breakthrough in battery technology, the new energy subsidies will be greatly degraded or even cancelled, and traditional power buses will still be valued by the market. “If there is no subsidy, it will have a great impact on the new energy bus market. For example, the price of pure electric buses is high, and the price of pure electric buses may rise; lithium carbonate batteries are three times more expensive than lithium iron phosphate batteries. The country's safety requirements for new energy buses have increased. At present, lithium iron phosphate batteries that are used more often do not meet higher requirements in the short term.” Zhang Bing, technical director of Xi'an Jinlong, told reporters, “In the future, if battery technology does not achieve breakthroughs. Sexual progress, the government does not mandate the purchase of zero-emission passenger cars, so the advantages of new energy buses compared with traditional power buses are not very prominent."

Ren Shifa said that last year, domestic new energy buses developed rapidly and sales volume doubled. Some enterprises believe that the traditional energy bus is thin, and the traditional bus technology has not yet mastered, so they go straight to the new energy bus field. However, in the first half of this year, the new energy bus market has changed significantly, while traditional energy buses are not affected by changes in subsidy policies. Some companies should have noticed this and come back to study traditional bus technology.

In addition, the improvement of the overall manufacturing level of new energy buses is inseparable from the traditional technology of passenger cars. If you want to cancel the subsidy, there is still a market for new energy buses. It needs to be easy to use and reliable, so that the market can really accept it. "To achieve this level, of course, we must solve the 'three power' system problem." Zhai Zhihao said, "But really do new energy products, but also improve the traditional technology, configuration and technology of passenger cars outside the 'three powers'."

"The prospect of pure electric bus is good, and the driving force for technological progress is also relatively strong. However, the development of pure electric bus is a long-term process, and it is not a three-year or five-year breakthrough," said Wang Jian. During this period, traditional energy buses still occupy an important position. Wang Jian also said that new energy buses that do not pay attention to traditional technology are costly and have a short life span. Such products are unlikely to be sustainable. New energy buses must adapt to the laws of the market and need to reduce costs, improve performance and longevity. These are also inseparable from the study of traditional bus technology.

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