The hottest trend of energy conservation and emiss

Energy saving and emission reduction and new energy vehicles promote the general trend of vehicle lightweight

the so-called vehicle lightweight refers to the process of reducing the vehicle quality as much as possible by adopting various advanced technologies or special materials in order to increase the utilization efficiency of energy and make it more energy-saving and safe, while ensuring that all important indicators such as vehicle safety meet the requirements of national and industrial standards

in recent years, many countries and regions in the world have set energy-saving and emission reduction targets, and China has also made it clear that by 2020, the average fuel consumption of new passenger cars will reach 5l/100km. Energy saving and emission reduction usually require high tensile properties of materials, such as heat shrinkable films and tensile films. Among the current energy-saving and emission reduction paths, vehicle lightweight is the easiest way to achieve and has relatively large potential. For passenger gasoline vehicles, the maximum fuel saving is 0.39l/100km for every 100kg reduction. On the other hand, for new energy vehicles, it is also necessary to improve the endurance capacity through vehicle lightweight

there is a great pressure on energy conservation and emission reduction, and lightweight becomes the development direction

20. When it breaks, the prefix 10 will automatically stop for 17 years, and the number of motor vehicles in China reaches 310million; Among them, the number of cars and new energy vehicles reached 217 million and 1.53 million respectively, with a year-on-year increase of 11.8% and 50.9% respectively. Motor vehicle pollution is an important cause of air pollution. With the growth of motor vehicle ownership, air pollution has also deteriorated

in 2017, the total emission of four pollutants from motor vehicles was preliminarily calculated to be 43.597 million tons, only 2.5% lower than that in 2016. Among them, cars are the main contributor to the total emission of pollutants, accounting for more than 80% of carbon monoxide and hydrocarbons, and more than 90% of carbon oxides and particulate matter. In addition to the pressure of emission reduction, the contradiction between the demand for oil resources and the shortage of oil resources has become increasingly prominent, and the oil control plans of various countries have also been accelerated. From the perspective of energy security, it is reasonable for China to develop lightweight

according to the evaluation method of automobile fuel consumption in Europe and China, for passenger gasoline vehicles, the maximum fuel saving is 0.39l/100km for every 100kg reduction. According to the fourth stage standard for fuel consumption of passenger cars issued by the Ministry of industry and information technology: by 2020, the average fuel consumption of new passenger cars will reach 5 liters/100 kilometers; By 2025, the average fuel consumption of new passenger cars will be 20% lower than that in 2020

fuel restrictions require new energy to gradually replace traditional fuels. While the performance of lithium electric batteries cannot be rapidly and significantly improved, higher requirements are put forward for the performance of the vehicle itself. Limited by the form of energy, the lighter body can reduce energy consumption and become one of the main breakthroughs in extending mileage

in general, the continuous improvement of vehicle fuel emission standards and the introduction of policies to encourage the development of energy-saving, environmental friendly and small displacement vehicles clearly outline that vehicle lightweight is the inevitable direction of vehicle development in the future

in addition, as one of the key objectives of future development, China has given detailed development requirements and plans. By 2020, the curb weight of the vehicle will be reduced by 10% compared with that in 2015, the strength of AHSS above 600MPa will just be applied to 50%, the amount of aluminum used for a single vehicle will reach 190kg, the amount of magnesium used for a single vehicle will reach 15kg, and a certain amount of carbon fiber will be used

driven by new energy vehicles, the general trend of lightweight

the development of new energy vehicles is the general trend, which is of positive significance for energy conservation and emission reduction. In September 2017, the Ministry of industry and information technology officially issued the measures for the administration of average fuel consumption and new energy vehicle credits of passenger vehicle enterprises. On the one hand, the policy urges all kinds of vehicle enterprises to reduce the level of fuel consumption caused by serious changes in their own industry plans, and actively promote energy conservation and emission reduction. On the other hand, it vigorously advocates the gradual transformation of new energy passenger vehicles to a high degree of energy cleanliness and increases their market penetration

with the development of new energy vehicles, especially the promotion of pure electric buses, the requirements for endurance mileage and EKG (energy consumption per unit load mass) are becoming higher and higher. Under the same power, the larger the curb weight is, the more limited the driving range is. Therefore, the lightweight of the body must become the inevitable choice of new energy vehicles

for new energy vehicles, it is more necessary to balance the mass increase caused by the use of power batteries through lightweight technology. According to the comparison between domestic fuel vehicles and new energy vehicles in 2015, the nominal density of new energy vehicle products is significantly higher, of which plug-in hybrid is about 151.84kg/m-3 and pure electric is 139kg/m-3, both higher than 115.6kg/m-3 of traditional fuel vehicles. Under the premise that the battery energy density cannot be improved in the short term, it is urgent to improve the competitiveness of new energy vehicle products through lightweight