环保可以说是近几年最热门的话题。“入世”、申奥成功等一系列重大事件,使环保日益受到国人的重视。对于当今的汽车而言,良好的环保性能是一项非常重要的要求。我国有关部门制定了严格的排放标准。为了满足国家环保排放要求,国内发动机企业纷纷研制开发符合排放标准的环保发动 Environmental protection can be said to be the hottest topic in recent years. A series of major events such as “joining the WTO” and the successful bid for the Olympic Games have made the environmental protection increasingly valued by the Chinese people. For today’s cars, good environmental performance is a very important requirement. Relevant departments of our country have formulated strict emission standards. In order to meet the national environmental emissions requirements, domestic engine companies have developed in line with emission standards for environmental protection launched