Gasoline multiple premixed compression ignition (MPCI): Controllable, high efficiency and clean combustion mode in direct injection engines
Gasoline multiple premixed compression ignition (MPCI): Controllable, high efficiency and clean combustion mode in direct injection engines
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DOI：
10.1007/s12239-013-0003-5
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发表时间：
2013-01
影响因子：
1.6
通讯作者：
H. Q. Yang;S. Shuai;Z. Wang;J. Wang
中科院分区：
文献类型：
--
作者：
H. Q. Yang;S. Shuai;Z. Wang;J. Wang
提出了一种汽油缸内直喷压燃（GDICI）方式下的“多次预混压燃”（MPCI）燃烧新概念。其主要特点是先预混后准预混的燃烧过程，其燃烧过程按“喷雾-燃烧-喷雾-燃烧”的顺序进行。多级预混燃烧将压力上升与污染物生成过程相结合，可以同时降低压力上升速率和排放，同时获得较高的热效率。汽油MPCI模式已在压缩比为18.5的研究发动机中得到验证。在1400 rpm、0.6 MPa IMEP条件下，在没有EGR和进气增压的情况下，测试了研究法辛烷值（罗恩）为94.4的汽油。研究了共轨压力和进气温度对MPCI模式性能的影响。与传统柴油机的单级扩散燃烧相比，汽油MPCI模式在共轨压力大于80 MPa时，碳烟、NO、CO排放较低，指示效率略高，但THC排放较高。在进气温度扫描的情况下，汽油MPCI模式与相同工况下的柴油相比也具有上述优点。
A novel combustion concept namely “multiple premixed compression ignition” (MPCI) in gasoline direct injection compression ignition (GDICI) regime is proposed. Its predominant feature is the first premixed and followed quasipremixed combustion processes in a sequence of “spray-combustion-spray-combustion”. The multiple-stage premixed combustion decouples the pressure rise with pollutants formation process, which means the pressure rise rate and emissions can be reduced simultaneously, while achieving a high thermal efficiency. The gasoline MPCI mode has been demonstrated in a research engine with a compression ratio of 18.5. Gasoline with the research octane number (RON) of 94.4 was tested under 1400 rpm, 0.6 MPa IMEP conditions, without EGR and intake boosting. A parameter study of common rail pressure and intake temperature was implemented to investigate their effects on the performance of MPCI mode. Compared to the single-stage diffusion combustion in traditional diesel engines, the gasoline MPCI mode achieves lower emissions of soot, NO, CO, as well as slightly higher indicated efficiency, with a penalty of higher THC emissions when the common rail pressure is larger than 80 MPa in this study. With intake temperature sweeping, the gasoline MPCI mode also has the foregoing advantages compared to the diesel under the same operating conditions.