HCCI模式NOx和Soot排放低但压升率高；柴油机扩散燃烧放热过程容易控制但NOx和Soot排放高；PPCI模式试图在两个极端之间寻求折中平衡。这三种国际上已有的先进压燃模式仍未打破碳烟-NOx-热效率-压升率四者间的此消彼长关系。而多次预混压燃（Multiple Premixed Compression Ignition，MPCI）模式，通过每次压燃过程燃油和空气充分混合，解决了最大压力升高率和燃烧噪声高的问题，实现缸内压力升高过程和污染物生成过程的解耦，获得发明专利。

       汽油压燃（HCCI, SCCI, PPCI）存在着燃烧放热过程的可控性和燃油经济性之间的耦合关系，汽油MPCI模式未牺牲燃油经济性，发明点是峰值燃烧温度低，且高温区域集中在燃烧室中部，降低传热损失，实现了燃烧放热可控性和燃油经济性之间的解耦。

       MPCI燃烧的核心学术思想是：分时燃烧避免出现两次燃烧叠加从而导致大规模集中放热的情况，并且实现燃烧分段；分区燃烧则是为了使第二次喷入的燃油避开第一段预混压燃结束之后的“活性热氛围”，也就是避开第一段燃烧之后高温已燃废气。汽油MPCI模式的第一段低温预混压燃发生在燃烧室外围区域，第二段高温预混压燃发生在燃烧室凹坑的中间部分。汽油MPCI和柴油机多次喷射在浓度-温度图上具体的燃烧路径如下。

专利: 王志，王步宇，等.ZL201410742566.1

代表性论文：

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