PM2.5 let many people in the country understand why smog appears, and frequent smog in various cities also sounded the alarm on urban air quality, the urgency of China's development of new energy buses again highlighted, and the existing market and technology Fundamentals determine the enormous growth potential of China's new energy bus market, of which online charging bus may be the future trend of development.

At the 2013 Online Rechargeable New Energy Bus (International) Symposium held in Zhuzhou, experts from public transit transport (IETO), Tsinghua University, bus manufacturers and city bus companies in Beijing, Guangzhou and Hangzhou agreed that in the wake of increased air pollution As well as the severe oil security situation, the traditional fuel-powered bus has been unable to meet the needs of energy-saving emission reduction. China must promote the development and promotion of new-energy public transport that can significantly reduce emissions.

Wang Binggang, a senior engineer of China Automotive Technology Research Center and head of the expert group of the National Clean Vehicle Action Coordination Leading Group, said at the beginning of this year 33 of the 74 monitored cities in China had reached serious pollution levels, and many cities were severely hazy Shrouded. At the same time, China's foreign dependence on oil has risen from less than 54% in 2010 to 58% last year.

As of May this year, China produced a total of 23,600 new energy buses (more than 10 meters in length). Among them, hybrid passenger car 16000, plug-in hybrid 3500, electric passenger car 4900. At present, the share of new energy buses in the large bus market is only about 10%, and the electric vehicle market share is only 0.1%, well below the level of Japan and Europe.

At the same time, China also achieved a breakthrough in lithium-ion battery technology, a key area for new energy public transport. The technical level of single cells has reached the international standard, laying a technological foundation for boosting the development of new energy public transport. It is estimated that in 2010 China's lithium battery production capacity has reached nearly 20 billion-watt hours, the assembly of 1 million vehicles.

From the industry trends, in addition to the existing hybrid cars and pure electric vehicles in the market, environmentally friendly, more economical "online charging" bus is rising, experts believe that low-cost mode of urban bus emissions, Has become China's city bus the best choice.

"On-line charging" refers to the operation of electric vehicles on the road for the vehicle does not affect the rhythm of the fast charging, divided into three modes: First, online charging network, that is, in the electric bus driving route, select the appropriate section of road laying On-line charging means that the vehicle is equipped with an A-PU system (auxiliary power unit). During operation, the on-board energy storage system is charged by the A-PU , Charged by the ground charging station after shutting down; thirdly, the site is charged online, that is, the energy storage system is rapidly charged at the point of starting (final) of the vehicle, and the charged power meets the needs of a single round trip operation of the vehicle.

Diversified charging mode to meet the needs of different cities in China. For example, in Beijing, Shanghai, Guangzhou, Hangzhou and other cable networks in cities, the original network can be used for online charging, with lower input costs. In cities without a network, it is possible to construct part of a network of lines and select an on-vehicle online charging or online charging mode of the site.

Experts point out that "online charging" bus biggest advantage is that environmental protection better than the traditional fuel bus, and cost-effective and significantly better than pure electric bus, because it uses fewer battery packs, battery usage is more reasonable.

According to statistics, an ordinary electric bus life cycle cost of operation up to 4 million yuan, while the network cable charging bus only 1.4 million to 2.62 million yuan, the site charging type 2.1 to 2.5 million yuan, vehicle-powered type of 242 million To 261 million.

At present, China has made some achievements in "online charging" public transportation. Such as Shanghai's transformation of the use of demolition of the trolley bus infrastructure, the development of a fast online charging super capacitor city bus; Chongqing City, the rapid charging lithium titanate battery performance, to achieve fast charging in the parking lot; Hunan CSR era electric car company also in In 2005, it developed the first transmission system of China-made electric car for buses and buses and implemented batch promotion and application in Beijing, Guangzhou and Hangzhou.

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