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1 前言汽车开发出来已经有一个多世纪。这期间 ,经过人们的努力 ,已经发展成为可以更加快捷、更加舒适地移动的方便的交通工具。然而 ,近年来汽车排气中的氮氧化物及浮游微粒物质等所引起的大气污染 ,二氧化碳所引起的地球变暖等被看成是严峻的问题 ,这就要求采取全球范围的相
1 Introduction The car has been developed for more than a century. During this period, people’s efforts have evolved into a convenient means of transport that can be moved faster and more comfortably. However, in recent years, air pollution caused by nitrogen oxides, suspended particulate matter and the like in automobile exhaust and global warming caused by carbon dioxide have been considered as serious problems, and this has required the adoption of a global phase