Effects of Combustion Phasing, Injection Timing, Relative Air-Fuel Ratio and Variable Valve Timing on SI Engine Performance and Emissions using 2,5-Dimethylfuran
Effects of Combustion Phasing, Injection Timing, Relative Air-Fuel Ratio and Variable Valve Timing on SI Engine Performance and Emissions using 2,5-Dimethylfuran
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DOI：
10.4271/2012-01-1285
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发表时间：
2012-04
影响因子：
1
通讯作者：
Ritchie Daniel;Chongming Wang;Hongming Xu;G. Tian
中科院分区：
文献类型：
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作者：
Ritchie Daniel;Chongming Wang;Hongming Xu;G. Tian
乙醇一直被认为是火花点火（SI）发动机的最佳汽油替代生物燃料。它在拉丁美洲和北美被广泛使用，并越来越多地被欧洲接受为一种有吸引力的选择。然而，它的低能量密度需要高的制造率;在缺乏可耕地的地区，这样的速度可能会有问题。因此，具有更高热值的燃料，如丁醇或2，5-二甲基呋喃（DMF）值得考虑;理论上，与乙醇相似的产量需要更少的土地。本报告讨论了DMF的适用性，以满足作为SI发动机中汽油的生物燃料替代品的需求，使用乙醇作为生物燃料基准。特别注意DMF的灵敏度，各种发动机控制参数：燃烧相位（点火正时），喷射正时，相对空燃比和气门正时（进气和排气）。重点是优化窗口;参数范围，维持最佳的IMEP（2%以内），但提供最大的减少排放（HC或NOx）。使用单缸SI研究发动机在1500 rpm下的测试结果表明，与汽油相比，DMF对关键发动机参数的敏感性较低。这允许更宽的排放优化窗口，因为IMEP在更大的参数范围内保持最佳。版权所有© 2012 SAE International.
Ethanol has long been regarded as the optimal gasoline-alternative biofuel for spark-ignition (SI) engines. It is used widely in Latin and North America and is increasingly accepted as an attractive option across Europe. Nevertheless, its low energy density requires a high rate of manufacture; in areas which are deficient of arable land, such rates might prove problematic. Therefore, fuels with higher calorific values, such as butanol or 2,5-dimethylfuran (DMF) deserve consideration; a similar yield to ethanol, in theory, would require much less land. This report addresses the suitability of DMF, to meet the needs as a biofuel substitute for gasoline in SI engines, using ethanol as the biofuel benchmark. Specific attention is given to the sensitivity of DMF to various engine control parameters: combustion phasing (ignition timing), injection timing, relative air-fuel ratio and valve timing (intake and exhaust). Focus is given to the window for optimization; the parameter range which sustains optimal IMEP (within 2%) but provides the largest reduction of emissions (HC or NOx). The test results using a single cylinder SI research engine at 1500rpm show how DMF is less sensitive to key engine parameters, compared to gasoline. This allows a wider window for emissions optimization because the IMEP remains optimal across a greater parameter range. Copyright © 2012 SAE International.