PCCI Operation with Early Injection of Conventional Diesel Fuel
PCCI Operation with Early Injection of Conventional Diesel Fuel
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DOI：
10.4271/2005-01-0378
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发表时间：
2005-04
期刊：
影响因子：
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通讯作者：
T. Kanda;T. Hakozaki;Tatsuya Uchimoto;Jyunichi Hatano;N. Kitayama;H. Sono
中科院分区：
文献类型：
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作者：
T. Kanda;T. Hakozaki;Tatsuya Uchimoto;Jyunichi Hatano;N. Kitayama;H. Sono
为了进一步降低废气排放，进行了有关预混充量压缩点火（PCCI）燃烧，这是通过早期喷射常规柴油到燃烧室实现的研究。用于实验的发动机是现代客车型共轨发动机的单缸版本，具有550（cm 3）的排量。为了防止喷雾与气缸套的相互作用，采用了一种具有较窄转角的喷油器。此外，压缩比降低，以避免过度提前点火的情况。此外，还采用了大量的冷却废气再循环（EGR）。这些措施大大减少了NOX的排放。然而，在活塞碗壁表面上形成的燃料壁膜导致碳烟、HC和CO排放增加。还观察到指示平均有效压力（IMEP）的降低以及变化系数IMEP（COV IMEP）的恶化，这两者都是由于过度提前点火和稀空燃混合气的形成。通过增加EGR和少量二次喷射，改善了IMEP和COV IMEP。它也能有效地减少烟尘。
In order to further reduce exhaust gas emissions, an investigation was carried out concerning premixed charge compression ignition (PCCI) combustion, which is achieved by the early injection of conventional diesel fuel to the combustion chamber. The engine used for the experiments was a single cylinder version of a modern passenger car type common rail engine with a displacement of 550(cm 3 ). An injector with a narrower corn angle was used to prevent interaction of the spray and the cylinder liner. Also, the compression ratio was decreased in order to avoid an excessively advanced ignition situation. Additionally, a large degree of cooled exhaust gas recirculation (EGR) was applied. These measures led to a significantly reduction in NOX emissions. However, a fuel wall-film, which was formed on the surface of the piston bowl wall, caused increases in soot, HC and CO emissions. Also observed was a reduction in indicated mean effective pressure (IMEP), as well as deteriorate in Coefficient of Variation-IMEP (COV IMEP), both of which result from excessively advanced ignition and the formation of lean air-fuel mixture. A measure, consisting of an EGR increase and a small amount of secondary injection, improved IMEP and COV IMEP. It was also effective in reducing soot.