为了研究不同海拔环境下机动车的PM排放情况，利用海拔环境仓对1台京Ⅴ轻型直喷汽油车进行不同海拔高度环境下的冷起动及热起动排放试验，并在相应条件下对微粒的排放情况进行分析和比较，最终得出轻型汽油车在不同海拔环境下PM排放的变化规律。%In order to study PM emission of vehicles under different altitudes ,the cold and hot start emission experiments un-der different altitudes were conducted on a Beijing-Ⅴ light-duty gasoline vehicle in the environment chamber and the PM emis-sions were analyzed and compared .The PM emission rules of light-duty gasoline vehicle under different altitudes were acquired .
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