车用汽油驱动性指数研究

车用汽油驱动性指数（DI）综合考虑了汽油各个馏分的分布，能较好地表征汽车冷起动性能和暖机性能。对DI的提出、研究进展及用途进行了阐述，并对我国车用汽油样品DI分布情况进行了初步分析研究。考察了不同季节、不同区域DI的分布情况，并考察了车用汽油质量升级对DI的影响。结果表明：我国汽油DI值范围分布较宽，不同地区的DI值差别很大；被考察地区不同季节DI值差别明显，冬季汽油DI值整体偏低；同一季节有些地区汽油DI值差别不大，但有的地区汽油DI值跨度很大。被考察的两个地区近几年随着油品的升级DI数值变化不大。有些地区的部分样品DI值较高应给予关注。

STUDY ON DRIVEABILITY INDEX FOR MOTOR GASOLINE

Driveability Index (DI) is a widely used index of overall driveability, especially in predicting cold-start and warm-up driveability. The research background, developments and applications of DI were stated. DI values of a large number of gasoline samples were determined and analyzed. The gasoline samples varied in regions, seasons and specifications. The results showed some regions have a large range of DI value. The DI level varies greatly among different regions. For the studied regions, the DI value is obviously lower as a whole in winter than summer. DI value in recent years changes very little according to the studied regions. Samples in some regions with high DI value need careful attention.