Combination of Combustion Concept and Fuel Property for Ultra-Clean DI Diesel
Combination of Combustion Concept and Fuel Property for Ultra-Clean DI Diesel
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DOI：
10.4271/2004-01-1868
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发表时间：
2004-06
期刊：
影响因子：
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通讯作者：
Keiji Kawamoto;T. Araki;Motohiro Shinzawa;S. Kimura;S. Koide;Masahiko Shibuya
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文献类型：
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作者：
Keiji Kawamoto;T. Araki;Motohiro Shinzawa;S. Kimura;S. Koide;Masahiko Shibuya
以前进行了实验研究与直喷式柴油发动机的目的是减少废气排放，特别是氮氧化物（NOx）和颗粒物（PM）。作为该工作的结果，开发了称为调制动力学（MK）燃烧的燃烧概念，其通过低温燃烧和预混合燃烧同时减少NOx和烟雾，以实现更清洁的柴油发动机。在随后的工作中，发现应用低压缩比对于扩大高负荷侧的MK燃烧区域是有效的。然后，MK概念与排气后处理系统相结合，并应用于测试车辆。结果表明达到了超低排放量车辆的排放水平，尽管是在实验室评估中。在目前的工作中，MK燃烧的概念和某些燃料特性的组合进行了实验研究，目的是进一步减少废气排放。结果表明，使用具有较低压缩比的高十六烷值的气-液（GTL）燃料提供了足够长的点火延迟来完成MK燃烧。证实了对NOx和烟的同时减少的效果。结果还表明，使用GTL燃料可以在寒冷条件下大幅降低总烃水平，因为其良好的点火特性，具有高十六烷值和高水平的石蜡化合物。因此，找到了一种实现SULEV排放水平的可能方法。
Experimental investigations were previously conducted with a direct-injection diesel engine with the aim of reducing exhaust emissions, especially nitrogen oxides (NOx) and particulate matter (PM). As a result of that work, a combustion concept, called Modulated Kinetics (MK) combustion, was developed that reduces NOx and smoke simultaneously through low-temperature combustion and premixed combustion to achieve a cleaner diesel engine. In subsequent work, it was found that applying a low compression ratio was effective in expanding the MK combustion region on the high-load side. The MK concept was then combined with an exhaust after-treatment system and applied to a test vehicle. The results indicated the attainment of ULEV emission levels, albeit in laboratory evaluations. In the present work, the combination of the MK combustion concept and certain fuel properties has been experimentally investigated with the aim of reducing exhaust emissions further. The results indicated that the use of a high cetane number gas-to-liquid (GTL) fuel with a lower compression ratio provides a sufficiently long ignition delay to accomplish MK combustion. The effect on a simultaneous reduction of NOx and smoke was confirmed. The results also indicated that the use of GTL fuel can reduce the total hydrocarbon level substantially under a cold condition because of its good ignition characteristics, with a high cetane number and high levels of paraffin compounds. As a result, one possible approach to the attainment of SULEV emission levels was found.