Premixed Compression Ignition (PCI) Combustion for Simultaneous Reduction of NOx and Soot in Diesel Engine
Premixed Compression Ignition (PCI) Combustion for Simultaneous Reduction of NOx and Soot in Diesel Engine
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DOI：
10.4271/2004-01-1907
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发表时间：
2004-06
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影响因子：
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通讯作者：
K. Okude;Kazutoshi Mori;Shiroh Shiino;Takeshi Moriya
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文献类型：
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作者：
K. Okude;Kazutoshi Mori;Shiroh Shiino;Takeshi Moriya
均质充量压缩点火（HCCI）燃烧作为一种新的燃烧技术已经被积极地进行研究，以充分地且同时地减少NOx和碳烟，从而符合未来严格的废气排放法规。在过去，已经提出了在压缩冲程的初始阶段喷射燃料的方法，但是已知燃料附着到气缸壁，导致燃烧效率下降和油稀释。作者开发了预混压缩点火（PCI）燃烧技术，以解决上述问题，同时减少NOx和碳烟。在PCI燃烧中，燃料在上止点附近被喷射到燃烧室中以防止燃料粘附到壁上，并且在点火之前不久形成的预混合物被燃烧。通过预混合，这种燃烧减少了混合物的过浓区域以减少碳烟排放，同时通过引入大量EGR降低了燃烧温度以减少NOx排放。本文报道了使用单缸发动机的PCI燃烧的基本特性的详细检查的结果，并且PCI燃烧，使用我们的研究方法可以实现大量的，同时减少NOx和碳烟。本文还研究了在高负荷运行条件下，由于柴油机爆震的限制，实现分流式煤粉燃烧的可能性，即在一个循环中采用煤粉燃烧和扩散燃烧两种不同的燃烧方式。作为这项研究的结果，本文报告说，它是可用的，以减少NOx和碳烟排放量在很大程度上由分流PCI燃烧，即使在高负荷运行。
Investigations of Homogeneous Charge Compression Ignition (HCCI) combustion have been actively conducted as a new combustion technology to substantially and simultaneously reduce NOx and soot to comply with the future stringent exhaust emission regulations. In the past, a method of injecting fuel at the initial stage of the compression stroke has been proposed, but it is known that fuel adheres to the cylinder wall, causing a decline in combustion efficiency and oil dilution. The authors have developed Premixed Compression Ignition (PCI) combustion as a technology of solving the above problem as well as simultaneously reducing NOx and soot. In PCI combustion, fuel is injected into a combustion chamber in the vicinity of the top dead center for preventing fuel from adhering to the wall, and pre-mixture, which is formed shortly before ignition, is burnt. By pre-mixing, this combustion reduces the over-rich region of the mixture to reduce soot emissions, and at the same time lowers the combustion temperature by introducing a large amount of EGR to reduce NOx emissions. This paper reports the result of detailed examination of the basic characteristics of PCI combustion using a single-cylinder engine, and that PCI combustion which uses our investigated approaching can achieve substantial and simultaneous reduction of NOx and soot. This paper also studies the possibility of realizing Split-PCI combustion, which uses the two different combustion modes of PCI combustion and diffusion combustion during one cycle, in high-load operation where application of PCI combustion is restricted by diesel knock. As results of this study, this paper reports that it is available to reduce NOx and soot emissions to a large extent by Split-PCI combustion, even in high-load operation.