宋义忠，李 韬，石 磊，邓康耀  

    摘要：能源和环境危机给汽车工业界提出了挑战，直接起动停止技术作为一项“节能减排”的关键性技术，目前已经受到越来越多的关注。其中直喷汽油机由于其直喷的特殊性，能够不依靠起动电机而直接在缸内喷油点火起动发动机，使得直接起动停止技术在能够在更多的车型上推广应用。但时至今日，直喷汽油机的直接启动技术仍然存在着较大的技术难关，本文将对其发展过程中存在的一些关键性问题进行阐述，并展望未来发展方向。

    关键词：直喷汽油机; 直接起动停止; 怠速; 排放

    Abstract: Energy and environmental risks is raising a challenge for vehicle industry. The direct start and stop technology as a key solution for energy saving and emission reduction has been obtaining more and more attentions. Because direct injection gasoline engine may start directly through direct in-cylinder ignition instead of through the starter motor, so this technology can be applied broadly in other vehicles . To date, there are still big technical issues in this direct start and start technology. This paper gives discussions on the some key technical issues and its way in the future.  

    Key words: Direct InjectionGasoline Engine; Direct Start and Stop; Idle Speed, Emission