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汽车作为一种方便、快捷的运输工具,在社会经济活动中发挥着举足轻重的作用。目前,全世界有近9亿辆汽车奔驰在大地上。随着社会经济的发展和人们生活水平的提高,乘用车大量进入普通家庭,各类商用汽车的使用也在不断增加。如今,人们对汽车使用性能的要求越来越高,主要体现在最大的燃料经济性、最低的排放污染、最低的使用成本、令人满意的其他性能(加速性、噪声、耐久性、操控性、舒适性、安全性、维修保养的便利性,
As a convenient and fast means of transport, the automobile plays a decisive role in the social and economic activities. Currently, nearly 900 million cars around the world run on the ground. With the development of society and economy and the improvement of people’s living standards, passenger cars have entered a large number of ordinary families and the use of various types of commercial vehicles is also on the rise. Nowadays, people are increasingly demanding on the performance of the vehicle, mainly in terms of the maximum fuel economy, the lowest emission pollution, the lowest cost, the other satisfactory performance (acceleration, noise, durability, maneuverability , Comfort, safety, ease of maintenance,